Globular clusters and the formation of the outer Galactic halo

The radii of globular clusters are used to study the early evolution of the Galactic halo. It is found that such cluster radii increase with Galactocentric distance and depend on orbit shape. It is suggested that metal enrichment in the Galactic halo might have been mainly a local phenomenon, whereas cluster radii may have been determined by more global properties of the protogalaxy.

[1]  A. D. Mackey,et al.  Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys – I. The old Large Magellanic Cloud clusters NGC 1928, 1939 and Reticulum , 2004, astro-ph/0404247.

[2]  P. Frinchaboy,et al.  A Two Micron All Sky Survey View of the Sagittarius Dwarf Galaxy. II. Swope Telescope Spectroscopy of M Giant Stars in the Dynamically Cold Sagittarius Tidal Stream , 2004, astro-ph/0403701.

[3]  M. Bellazzini,et al.  A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way , 2003, astro-ph/0311010.

[4]  D. Furley,et al.  Cosmic Problems: Essays on Greek and Roman Philosophy of Nature , 1990 .

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

[6]  Yale University,et al.  Remnants of the Sagittarius Dwarf Spheroidal Galaxy around the Young Globular Cluster Palomar 12 , 2002, astro-ph/0203296.

[7]  Ata Sarajedini,et al.  Photometry of the Globular Cluster M54 and the Sagittarius Dwarf Galaxy: The Age-Metallicity Relation , 2000 .

[8]  B. Tinsley,et al.  Evolution of galaxies and stellar populations , 1977 .

[9]  S. Bergh.  The proto-galaxy, globular clusters, and quasars , 1993 .

[10]  L. Spitzer,et al.  Random Gravitational Encounters and the Evolution of Spherical Systems. IV Isolated Systems of Identical Stars , 1972 .

[11]  John E. Hibbard,et al.  The globular cluster-galaxy connection , 1993 .

[12]  Cambridge,et al.  Surface brightness profiles and structural parameters for globular clusters in the Fornax and Sagittarius dwarf spheroidal galaxies , 2002, astro-ph/0211396.

[13]  K. C. Freeman,et al.  Formation of ω Centauri from an ancient nucleated dwarf galaxy in the young Galactic disc , 2003 .

[14]  Georges Meylan,et al.  Structure and dynamics of globular clusters , 1993 .

[15]  D. McLaughlin.  Binding Energy and the Fundamental Plane of Globular Clusters , 2000, astro-ph/0002086.

[16]  S. R. Majewski,et al.  The Absolute Proper Motion of Palomar 12: A Case for Tidal Capture from the Sagittarius Dwarf Spheroidal Galaxy , 2000, astro-ph/0006314.

[17]  Peter B. Stetson,et al.  NGC 2419, M92, and the age gradient in the galactic halo , 1997 .

[18]  THE GLOBULAR CLUSTER SYSTEM OF THE CANIS MAJOR DWARF GALAXY , 2004, astro-ph/0403136.

[19]  William E. Harris,et al.  A Catalog of Parameters for Globular Clusters in the Milky Way , 1996 .

[20]  Sidney van den Bergh,et al.  The Galaxies of the Local Group , 1968 .

[21]  A. D. Mackey,et al.  Surface brightness profiles and structural parameters for 53 rich stellar clusters in the Large Magellanic Cloud , 2002, astro-ph/0209031.

[22]  E. Burbidge,et al.  THE EVOLUTION OF GALAXIES , 1978 .

[23]  Terrence M. Girard,et al.  Space Velocities of Globular Clusters. III. Cluster Orbits and Halo Substructure , 1999 .

[24]  Jean P. Brodie,et al.  Hst Observations of Star Clusters in Ngc 1023: Evidence for Three Cluster Populations? , 2000 .

[25]  J. Ostriker,et al.  The Globular Cluster Luminosity Function as a Distance Indicator: Dynamical Effects , 1996, astro-ph/9611076.

[26]  Jeffrey D. Crane,et al.  Star Clusters in the Galactic Anticenter Stellar Structure and the Origin of Outer Old Open Clusters , 2004 .

[27]  B. Bohannan.  IN THE MAGELLANIC CLOUDS , 1990 .

[28]  A. Sandage,et al.  Evidence from the motions of old stars that the Galaxy collapsed. , 1962 .

[29]  H. Richer,et al.  Young globular clusters in the Milky Way Galaxy , 1992 .

[30]  P. Hodge.  TIDAL EFFECTS ON CLUSTERS OF THE LARGE MAGELLANIC CLOUD , 1962 .

[31]  R. Zinn,et al.  Compositions of halo clusters and the formation of the galactic halo , 1978 .

[32]  Taft E. Armandroff,et al.  Abundances and Kinematics of the Globular Cluster Systems of the Galaxy and of the Sagittarius Dwarf , 1995 .

[33]  M. Irwin,et al.  A dwarf satellite galaxy in Sagittarius , 1994, Nature.

[34]  Alan P. Lightman,et al.  The dynamical evolution of globular clusters , 1978 .

[35]  M. Azzopardi,et al.  Surveying Carbon Stars in the Dwarf Spheroidal Galaxies , 1992 .

[36]  D. Dinescu,et al.  A Capture Scenario for the Globular Cluster ω Centauri , 2003, astro-ph/0304262.

[37]  R. Wyse.  in The Local Group as an Astrophysical Laboratory , 2005 .

[38]  R. Zinn.  Globular cluster system of the galaxy. II. The spatial and metallicity distributions, the second parameter phenomenon, and the formation of the cluster system , 1980 .

[39]  B. Yanny,et al.  The Extended Tails of Palomar 5: A 10° Arc of Globular Cluster Tidal Debris , 2003, astro-ph/0307446.

[40]  W. Roberts,et al.  Structure of the globular clusters in the Fornax dwarf elliptical galaxy , 1994 .

[41]  S. Djorgovski,et al.  New horizons in globular cluster astronomy : proceedings of a conference held at Università di Padova, Padova, Italy 24-28 June, 2002 , 2003 .

[42]  Jeremiah P. Ostriker,et al.  On the evolution of globular cluster systems. I - Present characteristics and rate of destruction in our Galaxy , 1988 .

[43]  R. Ibata,et al.  Tracing the Sgr Stream with 2MASS - Detection of Stream stars around Outer Halo globular clusters , 2003, astro-ph/0304502.