The SLUGGS Survey: kinematics for over 2500 globular clusters in 12 early-type galaxies

We present a spectro-photometric survey of 2522 extragalactic globular clusters (GCs) around twelve early-type galaxies, nine of which have not been published previously. Combining space‐based and multi‐colour wide field ground‐based imagi ng, with spectra from the Keck DEIMOS instrument, we obtain an average of 160 GC radial velocities per galaxy, with a high velocity precision of � 15 km s 1 per GC. After studying the photometric properties of the GC systems, such as their spatial and colour distribut ions, we focus on the kinematics of metal-poor (blue) and metal-rich (red) GC subpopulations to an average distance of � 8 effective radii from the galaxy centre. Our results show that for some systems the bimodality in GC colour is also present in GC kinematics. The kinematics of the red GC subpopulations are strongly coupled with the host galaxy stellar kinematics. The blue GC subpopulations are more dominated by random motions, especially in the outer regions, and decoupled fro m the red GCs. Peculiar GC kinematic profiles are seen in some galaxies: the blue GCs in NGC 821 rotate along the galaxy minor axis, whereas the GC system of the lenticular galaxy NGC 7457 appears to be strongly rotation supported in the outer region. We supplement our galaxy sample with data from the literature and carry out a number of tests to study the kinematic differences between the two GC subpopulations. We confirm that the GC kinematics are coupled with the host galaxy properties and find that the velocity kurtosis and the slope of their velocity dispersion profiles is different between the two GC subpopulations in more massive galaxies.

[1]  P. Harding,et al.  EXPLORING THE UNUSUALLY HIGH BLACK-HOLE-TO-BULGE MASS RATIOS IN NGC 4342 AND NGC 4291: THE ASYNCHRONOUS GROWTH OF BULGES AND BLACK HOLES , 2012, 1203.1641.

[2]  U. Keshet.  SPIRAL FLOWS IN COOL-CORE GALAXY CLUSTERS , 2011, 1111.2337.

[3]  R. Bender,et al.  A REVISED PARALLEL-SEQUENCE MORPHOLOGICAL CLASSIFICATION OF GALAXIES: STRUCTURE AND FORMATION OF S0 AND SPHEROIDAL GALAXIES , 2011, 1110.4384.

[4]  J. Strader,et al.  WIDE-FIELD PRECISION KINEMATICS OF THE M87 GLOBULAR CLUSTER SYSTEM , 2011, 1110.2778.

[5]  J. Strader,et al.  THE RELATIONSHIPS AMONG COMPACT STELLAR SYSTEMS: A FRESH VIEW OF ULTRACOMPACT DWARFS , 2011, 1109.5696.

[6]  Canada.,et al.  NONLINEAR COLOR–METALLICITY RELATIONS OF GLOBULAR CLUSTERS. II. A TEST ON THE NONLINEARITY SCENARIO FOR COLOR BIMODALITY USING THE u-BAND COLORS: THE CASE OF M87 (NGC 4486) , 2011, 1109.5174.

[7]  Jaeil Cho,et al.  NONLINEAR COLOR–METALLICITY RELATIONS OF GLOBULAR CLUSTERS. III. ON THE DISCREPANCY IN METALLICITY BETWEEN GLOBULAR CLUSTER SYSTEMS AND THEIR PARENT ELLIPTICAL GALAXIES , 2011, 1109.5178.

[8]  J. Peñarrubia,et al.  A METHOD FOR MEASURING (SLOPES OF) THE MASS PROFILES OF DWARF SPHEROIDAL GALAXIES , 2011, 1108.2404.

[9]  Scott Croom,et al.  The WiggleZ Dark Energy Survey: high-resolution kinematics of luminous star-forming galaxies , 2011, 1107.3338.

[10]  J. Strader,et al.  Spectra of globular clusters in the Sombrero galaxy: evidence for spectroscopic metallicity bimodality , 2011, 1107.0757.

[11]  J. Strader,et al.  THE GLOBULAR CLUSTER POPULATION OF NGC 7457: CLUES TO THE EVOLUTION OF FIELD S0 GALAXIES , 2011, 1106.5058.

[12]  L. Chomiuk,et al.  THE FOSSIL RECORD OF TWO-PHASE GALAXY ASSEMBLY: KINEMATICS AND METALLICITIES IN THE NEAREST S0 GALAXY , 2011, 1106.0745.

[13]  R. Sharples,et al.  Gemini/GMOS imaging of globular cluster systems in five early-type galaxies , 2011, 1105.1755.

[14]  J. Strader,et al.  Global properties of ‘ordinary’ early-type galaxies: photometry and spectroscopy of stars and globular clusters in NGC 4494 , 2011, 1104.5503.

[15]  M. Hilker,et al.  A large population of ultra-compact dwarf galaxies in the Hydra I cluster ? , 2011, 1103.5463.

[16]  Timothy A. Davis,et al.  The ATLAS3D project – III. A census of the stellar angular momentum within the effective radius of early‐type galaxies: unveiling the distribution of fast and slow rotators , 2011, 1102.4444.

[17]  K. Alatalo,et al.  The ATLAS3D project - II. Morphologies, kinemetric features and alignment between photometric and kinematic axes of early-type galaxies , 2011, 1102.3801.

[18]  J. Strader,et al.  Evidence for two phases of galaxy formation from radial trends in the globular cluster system of NGC 1407 , 2011, 1101.3575.

[19]  R. Davies,et al.  The ATLAS3D project – I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria , 2010, 1012.1551.

[20]  S. Bamford,et al.  The PN.S elliptical galaxy survey: A standard ΛCDM halo around NGC 4374? , 2010, 1010.1533.

[21]  Jeremiah P. Ostriker,et al.  THE TWO PHASES OF GALAXY FORMATION , 2010, 1010.1381.

[22]  J. Strader,et al.  An optical/NIR survey of globular clusters in early-type galaxies I. Introduction and data reduction procedures , 2010, 1010.0687.

[23]  W. Harris,et al.  NEW g′r′i′z′ PHOTOMETRY OF THE NGC 5128 GLOBULAR CLUSTER SYSTEM , 2010, 1009.3432.

[24]  V. Belokurov,et al.  Rotation of halo populations in the Milky Way and M31 , 2010, 1008.3067.

[25]  R. Kudritzki,et al.  PLANETARY NEBULAE IN THE ELLIPTICAL GALAXY NGC 821: KINEMATICS AND DISTANCE DETERMINATION , 2010, 1008.2237.

[26]  Michael J. Williams,et al.  The Tully-Fisher relations of early-type spiral and S0 galaxies , 2010, 1007.4072.

[27]  France.,et al.  X-ray and multiwavelength view of NGC 4278: A LINER-Seyfert connection? , 2010, 1004.5134.

[28]  K. Masters,et al.  THE ADVANCED CAMERA FOR SURVEYS FORNAX CLUSTER SURVEY. VII. HALF-LIGHT RADII OF GLOBULAR CLUSTERS IN EARLY-TYPE GALAXIES , 2010, 1003.3450.

[29]  W. Harris,et al.  THE KINEMATICS OF THE GLOBULAR CLUSTER SYSTEM OF NGC 5128 WITH A NEW LARGE SAMPLE OF RADIAL VELOCITY MEASUREMENTS , 2010, 1002.3142.

[30]  Alexander L. Muratov,et al.  MODELING THE METALLICITY DISTRIBUTION OF GLOBULAR CLUSTERS , 2010, 1002.1325.

[31]  R. Genzel,et al.  Star-forming galaxies at z∼ 2 and the formation of the metal-rich globular cluster population , 2010, 1001.1740.

[32]  J. Blakeslee,et al.  THE MASS–METALLICITY RELATION OF GLOBULAR CLUSTERS IN THE CONTEXT OF NONLINEAR COLOR–METALLICTY RELATIONS , 2010, 1001.0979.

[33]  L. Hernquist,et al.  ORBITAL STRUCTURE OF MERGER REMNANTS. I. EFFECT OF GAS FRACTION IN PURE DISK MERGERS , 2010, 1001.0799.

[34]  H. Hwang,et al.  THE GLOBULAR CLUSTER SYSTEM OF THE VIRGO GIANT ELLIPTICAL GALAXY NGC 4636. I. SUBARU/FAINT OBJECT CAMERA AND SPECTROGRAPH SPECTROSCOPY AND DATABASE , 2009, 0912.1728.

[35]  J. Strader,et al.  Probing the 2D kinematic structure of early-type galaxies out to three effective radii , 2009 .

[36]  P. Hopkins,et al.  Metallicity gradients at large galactocentric radii using the near-infrared Calcium triplet , 2009, 0908.3705.

[37]  Kyle R. Stewart,et al.  MERGERS AND BULGE FORMATION IN ΛCDM: WHICH MERGERS MATTER? , 2009, 0906.5357.

[38]  Oxford,et al.  Stellar velocity profiles and line strengths out to four effective radii in the early-type galaxies NGC 3379 and 821 , 2009, 0906.0018.

[39]  J. Strader,et al.  EVIDENCE FOR THE DISKY ORIGIN OF LUMINOUS VIRGO DWARF ELLIPTICALS FROM THE KINEMATICS OF THEIR GLOBULAR CLUSTER SYSTEMS , 2009, 0903.4364.

[40]  James Binney,et al.  Galactic Dynamics: Second Edition , 2008 .

[41]  K. Abazajian,et al.  THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY , 2008, 0812.0649.

[42]  A. Finoguenov,et al.  The orbital structure of the massive elliptical galaxy NGC 5846 , 2008 .

[43]  K. Kuijken,et al.  Kinematic properties of early type galaxy halos using planetary nebulae , 2008, Proceedings of the International Astronomical Union.

[44]  B. Elmegreen,et al.  BULGE AND CLUMP EVOLUTION IN HUBBLE ULTRA DEEP FIELD CLUMP CLUSTERS, CHAINS AND SPIRAL GALAXIES , 2008, 0810.5404.

[45]  K. Kuijken,et al.  The Planetary Nebula Spectrograph elliptical galaxy survey: the dark matter in NGC 4494 , 2008, 0810.1291.

[46]  J. Strader,et al.  MAPPING THE DARK SIDE WITH DEIMOS: GLOBULAR CLUSTERS, X-RAY GAS, AND DARK MATTER IN THE NGC 1407 GROUP , 2008, 0809.2088.

[47]  R. Teyssier,et al.  Cold streams in early massive hot haloes as the main mode of galaxy formation , 2008, Nature.

[48]  T. Lauer,et al.  DISSIPATION AND EXTRA LIGHT IN GALACTIC NUCLEI. II. “CUSP” ELLIPTICALS , 2008, 0805.3533.

[49]  L. Chomiuk,et al.  THE PECULIAR GLOBULAR CLUSTER SYSTEM OF THE S0 GALAXY NGC 7457 , 2008, 0804.4472.

[50]  K. Kuijken,et al.  Dearth of dark matter or massive dark halo? Mass-shape-anisotropy degeneracies revealed by nmagic dynamical models of the elliptical galaxy NGC 3379 , 2008, 0804.3350.

[51]  K. Bekki,et al.  The origin of globular cluster systems from cosmological simulations , 2008, 0804.1842.

[52]  K. Gebhardt,et al.  HOBBY–EBERLY TELESCOPE OBSERVATIONS OF THE DARK HALO IN NGC 821 , 2008, 0803.3626.

[53]  H. Hwang,et al.  Washington CCD Photometry of the Globular Cluster System of the Giant Elliptical Galaxy M60 in Virgo , 2008, 0802.1621.

[54]  Supercomputing,et al.  The early-type galaxies NGC 1407 and NGC 1400 – II. Star formation and chemical evolutionary history , 2008, 0801.2005.

[55]  Supercomputing,et al.  The early-type galaxies NGC 1407 and NGC 1400 – I. Spatially resolved radial kinematics and surface photometry , 2008, 0801.2003.

[56]  R. Sharples,et al.  Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923 , 2007, 0712.1818.

[57]  J. Strader,et al.  The connection between globular cluster systems and their host galaxy and environment: a case study of the isolated elliptical NGC 821 , 2007, 0712.1382.

[58]  H. Hwang,et al.  The Globular Cluster System of M60 (NGC 4649). II. Kinematics of the Globular Cluster System , 2007, 0709.4309.

[59]  W. Harris,et al.  The Leo Elliptical NGC 3379: A Metal-Poor Halo Emerges , 2007 .

[60]  B. G. Elmegreen,et al.  Rapid Formation of Exponential Disks and Bulges at High Redshift from the Dynamical Evolution of Clump-Cluster and Chain Galaxies , 2007, 0708.0306.

[61]  Astronomy,et al.  The formation of S0 galaxies: evidence from globular clusters , 2007, 0705.0623.

[62]  Harald Kuntschner,et al.  The SAURON project – IX. A kinematic classification for early‐type galaxies , 2007, astro-ph/0703531.

[63]  E. Emsellem,et al.  The SAURON project – X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/σ, ɛ) diagram with integral‐field stellar kinematics , 2007, astro-ph/0703533.

[64]  K. Kuijken,et al.  The PN.S Elliptical Galaxy Survey: Data Reduction, Planetary Nebula Catalog, and Basic Dynamics for NGC 3379 , 2007, astro-ph/0703047.

[65]  J. Tonry,et al.  The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early-Type Galaxies , 2007, astro-ph/0702496.

[66]  M. Elvis,et al.  A Deep Chandra, Very Large Array, and Spitzer Infrared Array Camera Study of the Very Low Luminosity Nucleus of the Elliptical NGC 821 , 2007, astro-ph/0701642.

[67]  J. Tonry,et al.  The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three-dimensional Structure of the Virgo Cluster , 2007, astro-ph/0702510.

[68]  P. J. McMillan,et al.  The haloes of merger remnants , 2007, astro-ph/0701541.

[69]  J. Strader,et al.  Damp Mergers: Recent Gaseous Mergers without Significant Globular Cluster Formation? , 2006, astro-ph/0612415.

[70]  T. An,et al.  Probing the Mass Distributions in NGC 1407 and Its Associated Group with the X-Ray Imaging Spectroscopic and Optical Photometric and Line-Strength Indices Data , 2006, astro-ph/0610934.

[71]  M. Bureau,et al.  The SAURON project – VIII. OASIS/CFHT integral-field spectroscopy of elliptical and lenticular galaxy centres , 2006, astro-ph/0609452.

[72]  J. Tonry,et al.  The ACS Virgo Cluster Survey. XIV. Analysis of Color-Magnitude Relations in Globular Cluster Systems , 2006, astro-ph/0609079.

[73]  R. Sharples,et al.  A Subaru/Suprime-Cam Wide-Field Survey of Globular Cluster Populations around M87 , 2006, astro-ph/0609070.

[74]  J. Prieto,et al.  Dynamical Evolution of Globular Clusters in Hierarchical Cosmology , 2006, Proceedings of the International Astronomical Union.

[75]  K. Bekki,et al.  Stellar haloes and elliptical galaxy formation: origin of dynamical properties of the planetary nebula systems , 2006, astro-ph/0606546.

[76]  J. Strader,et al.  Hubble Space Telescope ACS Wide-Field Photometry of the Sombrero Galaxy Globular Cluster System , 2006, astro-ph/0606337.

[77]  B. Santiago,et al.  The globular cluster system of NGC 5846 revisited: colours, sizes and x-ray counterparts , 2006, astro-ph/0604499.

[78]  S. Brough,et al.  Eridanus – a supergroup in the local Universe? , 2006, astro-ph/0603778.

[79]  J. Strader,et al.  Extragalactic Globular Clusters and Galaxy Formation , 2006, astro-ph/0602601.

[80]  M. Skrutskie,et al.  The Two Micron All Sky Survey (2MASS) , 2006 .

[81]  S. Yi,et al.  Explaining the Color Distributions of Globular Cluster Systems in Elliptical Galaxies , 2006, Science.

[82]  Chile.,et al.  Globular cluster systems in low-luminosity early-type galaxies near the Fornax cluster centre , 2005, astro-ph/0511770.

[83]  G. Bergond,et al.  Wide-field kinematics of globular clusters in the Leo I group , 2005, astro-ph/0511492.

[84]  R. Sharples,et al.  Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379 , 2005, astro-ph/0510838.

[85]  J. Strader,et al.  An imaging study of the globular cluster systems of NGC 1407 and 1400 , 2005, astro-ph/0510599.

[86]  University of California,et al.  Globular clusters, satellite galaxies and stellar haloes from early dark matter peaks , 2005, astro-ph/0510370.

[87]  J. Tonry,et al.  The ACS Virgo Cluster Survey. IX. The Color Distributions of Globular Cluster Systems in Early-Type Galaxies , 2005, astro-ph/0509654.

[88]  K. Bekki,et al.  Kinematics of globular cluster systems and the formation of early-type galaxies , 2005, astro-ph/0509077.

[89]  J. Tonry,et al.  The ACS Virgo Cluster Survey. X. Half-Light Radii of Globular Clusters in Early-Type Galaxies: Environmental Dependencies and a Standard Ruler for Distance Estimation , 2005, astro-ph/0508219.

[90]  UCOLick,et al.  Globular clusters in NGC 4365: new K-band imaging and a reassessment of the case for intermediate-age clusters , 2005, astro-ph/0508181.

[91]  J. Strader,et al.  Globular Clusters in Virgo Ellipticals: Unexpected Results for Giants and Dwarfs from Advanced Camera for Surveys Imaging , 2005, astro-ph/0508001.

[92]  U. California,et al.  The distribution and kinematics of early high-σ peaks in present-day haloes: implications for rare objects and old stellar populations , 2005, astro-ph/0506615.

[93]  R. Proctor,et al.  Spatially resolved stellar populations in the isolated elliptical NGC 821 , 2005, astro-ph/0506523.

[94]  J. Strader,et al.  Extragalactic Globular Clusters: Old Spectroscopic Ages and New Views on Their Formation , 2005, astro-ph/0506289.

[95]  A. Burkert,et al.  The Evolution of the Dark Halo Spin Parameters lambda and lambda' in a LCDM Universe: The Role of Minor and Major Mergers , 2005, astro-ph/0505249.

[96]  M. Caprio,et al.  LevelScheme: A level scheme drawing and scientific figure preparation system for Mathematica , 2005, Comput. Phys. Commun..

[97]  M. Bershady,et al.  Total Galaxy Magnitudes and Effective Radii from Petrosian Magnitudes and Radii , 2005, astro-ph/0504287.

[98]  F. Bournaud,et al.  Galaxy mergers with various mass ratios: properties of remnants , 2005, astro-ph/0503189.

[99]  H. Falcke,et al.  Radio sources in low-luminosity active galactic nuclei IV. Radio luminosity function, importance of jet power, and radio properties of the complete Palomar sample , 2005, astro-ph/0502551.

[100]  J. Strader,et al.  Old Globular Clusters Masquerading as Young in NGC 4365? , 2005, astro-ph/0502467.

[101]  Cambridge,et al.  Lost and found dark matter in elliptical galaxies , 2005, Nature.

[102]  Ralf Bender,et al.  VLT spectroscopy of globular cluster systems - I:the photometric and spectroscopic data set , 2004, astro-ph/0505448.

[103]  D. Forbes,et al.  Keck spectroscopy and imaging of globular clusters in the lenticular galaxy NGC 524 , 2003, astro-ph/0312354.

[104]  K. Kuijken,et al.  Tracing the star stream through M31 using planetary nebula kinematics , 2003, astro-ph/0311090.

[105]  S. Zepf,et al.  The Globular Cluster Systems of the Early-Type Galaxies NGC 3379, NGC 4406, and NGC 4594 and Implications for Galaxy Formation , 2003, astro-ph/0310277.

[106]  S. Okamura,et al.  Subaru Deep Survey. VI. A Census of Lyman Break Galaxies at z ≃ 4 and 5 in the Subaru Deep Fields: Clustering Properties , 2003, astro-ph/0309657.

[107]  K. Kuijken,et al.  A Dearth of Dark Matter in Ordinary Elliptical Galaxies , 2003, Science.

[108]  S. Tremaine,et al.  Kinematics of 10 Early-Type Galaxies from Hubble Space Telescope and Ground-based Spectroscopy , 2003, astro-ph/0306464.

[109]  A. Kravtsov,et al.  Formation of Globular Clusters in Hierarchical Cosmology , 2003, astro-ph/0305199.

[110]  K. Ashman,et al.  Modeling the Dynamical Evolution of the M87 Globular Cluster System , 2003, astro-ph/0305064.

[111]  P. Côté,et al.  Dynamics of the Globular Cluster System Associated with M49 (NGC 4472): Cluster Orbital Properties and the Distribution of Dark Matter , 2003, astro-ph/0303229.

[112]  Alison L. Coil,et al.  The DEIMOS spectrograph for the Keck II Telescope: integration and testing , 2003, SPIE Astronomical Telescopes + Instrumentation.

[113]  Doug Geisler,et al.  The Globular Cluster System of NGC 1399. I. A Wide-Field Photometric Study , 2003, astro-ph/0301223.

[114]  J. Makino,et al.  Dynamical evolution of star clusters in tidal fields , 2002, astro-ph/0211471.

[115]  T. Puzia,et al.  Evidence for an Intermediate-Age, Metal-rich Population of Globular Clusters in NGC 4365 , 2002, astro-ph/0211434.

[116]  S. Okamura,et al.  Subaru Prime Focus Camera — Suprime-Cam , 2002, astro-ph/0211006.

[117]  V. Chavushyan,et al.  Young Stellar Nuclei in Lenticular Galaxies: NGC 5574 and NGC 7457 , 2002 .

[118]  W. Couch,et al.  Globular cluster formation from gravitational tidal effects of merging and interacting galaxies , 2002, astro-ph/0206008.

[119]  S. Larsen,et al.  New Members of the Cluster Family in Nearby Lenticular Galaxies , 2002, astro-ph/0203454.

[120]  C. Baugh,et al.  On the formation of globular cluster systems in a hierarchical Universe , 2002, astro-ph/0202191.

[121]  D. Forbes,et al.  Age Estimates for Globular Clusters in NGC 1399 , 2001, astro-ph/0111185.

[122]  J. Huchra,et al.  Spectroscopy of Globular Clusters in M81 , 2001, astro-ph/0111063.

[123]  S. University,et al.  A catalogue and analysis of X-ray luminosities of early-type galaxies , 2001, astro-ph/0108181.

[124]  Thomas J. Chester,et al.  The 2MASS Large Galaxy Atlas , 2001 .

[125]  P. Côté,et al.  Dynamics of the Globular Cluster System Associated with M87 (NGC 4486). II. Analysis , 2001, astro-ph/0106005.

[126]  R. Wechsler,et al.  The Origin of Angular Momentum in Dark Matter Halos , 2001, astro-ph/0105349.

[127]  B. Whitmore,et al.  New Insights from Hubble Space Telescope Studies of Globular Cluster Systems. II. Analysis of 29 S0 Systems , 2001, astro-ph/0105198.

[128]  M. Weil,et al.  Cosmological Evolution of Supergiant Star-forming Clouds , 2001, astro-ph/0103256.

[129]  J. P. Huchra,et al.  Properties of Globular Cluster Systems in Nearby Early-Type Galaxies , 2001, astro-ph/0102374.

[130]  Gerard A. Luppino,et al.  The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances , 2000, astro-ph/0011223.

[131]  S. Zepf,et al.  The Globular Cluster System in the Outer Regions of NGC 4472 , 2000, astro-ph/0010065.

[132]  H. Rix,et al.  The Kinematics of 3:1 Merger Remnants and the Formation of Low-Luminosity Elliptical Galaxies , 2000, astro-ph/0009132.

[133]  R. Sharples,et al.  Ages and Metallicities of Globular Clusters in NGC 4472 , 2000, astro-ph/0007063.

[134]  R. Bender,et al.  Orbital structure and mass distribution in elliptical galaxies , 2000 .

[135]  K. Olsen,et al.  The Globular Cluster Systems of the Sculptor Group , 2000, astro-ph/0401619.

[136]  S. Ichikawa,et al.  The Central Gas Systems of Early-Type Galaxies Traced by Dust Features, Based on the Hubble Space Telescope WFPC2 Archival Images , 2000, astro-ph/0003431.

[137]  K. Gebhardt,et al.  Globular Cluster Systems. I. V−I Color Distributions , 1999, astro-ph/9906499.

[138]  P. Côté.  Kinematics of the Galactic Globular Cluster System: New Radial Velocities for Clusters in the Direction of the Inner Galaxy , 1999, astro-ph/9906465.

[139]  D. Schlegel,et al.  Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds , 1998 .

[140]  K. Bekki.  Unequal-Mass Galaxy Mergers and the Creation of Cluster S0 Galaxies , 1998, astro-ph/9806106.

[141]  P. Côté,et al.  The Formation of Giant Elliptical Galaxies and Their Globular Cluster Systems , 1998, astro-ph/9804319.

[142]  D. Joanes,et al.  Comparing measures of sample skewness and kurtosis , 1998 .

[143]  D. Schlegel,et al.  Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds , 1997, astro-ph/9710327.

[144]  R. Saglia,et al.  Breaking the degeneracy between anisotropy and mass: the dark halo of the E0 galaxy NGC 6703 , 1997, astro-ph/9710129.

[145]  C. Grillmair,et al.  Keck Spectroscopy of Globular Clusters around NGC 1399 , 1997, astro-ph/9710117.

[146]  J. Blakeslee,et al.  The Ages and Abundances of a Large Sample of M87 Globular Clusters , 1997, astro-ph/9709192.

[147]  C. Grillmair,et al.  On the origin of globular clusters in elliptical and cD galaxies , 1997, astro-ph/9702146.

[148]  J. Huchra,et al.  Hubble Space Telescope imaging of the globular cluster system around NGC 5846 , 1996, astro-ph/9612172.

[149]  D. Forbes.  Globular cluster luminosity functions and the Hubble constant from WFPC2 imaging: the dominant group elliptical NGC 5846 , 1996, astro-ph/9611141.

[150]  C. Carollo,et al.  Ellipticals with Kinematically--Distinct Cores: WFPC2 Imaging of Globular Clusters , 1996, astro-ph/9604146.

[151]  William B. Sparks,et al.  Hubble Space Telescope Observations of Globular Clusters in M87 and an Estimate of H0 , 1995 .

[152]  K. Ashman,et al.  Detecting Bimodality in Astronomical Datasets , 1994, astro-ph/9408030.

[153]  R. Bender,et al.  Line-of-sight velocity distributions of elliptical galaxies , 1994 .

[154]  G. Illingworth,et al.  Kinematics of 12 elliptical galaxies , 1994 .

[155]  P. Salucci,et al.  Dark Matter Halos in Elliptical Galaxies , 1993 .

[156]  K. Ashman,et al.  Globular cluster systems formed in galaxy mergers , 1993 .

[157]  D. Geisler,et al.  The metallicity gradient and distribution function of globular clusters around NGC 1399 , 1993 .

[158]  M. Franx,et al.  A new method for the identification of non-Gaussian line profiles in elliptical galaxies , 1993 .

[159]  M. Valtonen,et al.  Tidal generation of active spirals and S0 galaxies by rich clusters , 1990 .

[160]  Michael J. Kurtz,et al.  The Southern Sky Redshift Survey , 1988, astro-ph/9804064.

[161]  J. Tonry,et al.  A survey of galaxy redshifts. I. Data reduction techniques. , 1979 .

[162]  S. Faber,et al.  Neutral hydrogen in the normal elliptical galaxy NGC 4278. , 1977 .

[163]  K. Schwarzschild,et al.  The Observatory , 1886 .

[164]  A. Sandage,et al.  The Carnegie atlas of galaxies , 1994 .

[165]  Stephen E. Zepf,et al.  The Formation of Globular Clusters in Merging and Interacting Galaxies , 1992 .