The 2-10 keV luminosity as a Star Formation Rate indicator

Radio and far infrared luminosities of star-forming galaxies follow a tight linear relation. Making use of ASCA and BeppoSAX observations of a well-defined sample of nearby star-forming galaxies, we argue that tight linear relations hold between the X-ray, radio and far infrared luminosities. The effect of intrinsic absorption is investigated taking NGC3256 as a test case. It is suggested that the hard X-ray emission is directly related to the Star Formation Rate. Star formation processes may also account for most of the 2-10 keV emission from LLAGNs of lower X-ray luminosities (for the same FIRand radio luminosity). Deep Chandra observations of a sample of radio-selected star-forming galaxies in the Hubble Deep Field North show that the same relation holds also at high (0.2 < z < 1.3) redshift. The X-ray/radio relations also allow a derivation of X-ray number counts up to very faint fluxes from the radio Log N-Log S, which is consistent with current limits and models. Thus the contribution of star-forming galaxies to the X-ray background can be estimated.

[1]  W. Brandt,et al.  The Chandra Deep Field North Survey. XII. The Link between Faint X-Ray and Radio Source Populations , 2002, astro-ph/0207433.

[2]  Y. Rephaeli,et al.  RXTE view of the starburst galaxies M 82 and NGC 253 , 2002, astro-ph/0204429.

[3]  R. S. Warwick,et al.  X-ray background measurements with XMM-Newton EPIC , 2002, astro-ph/0204147.

[4]  L. Ho,et al.  X-Ray Properties of LINERs and Low-Luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results , 2002, astro-ph/0203005.

[5]  R. Griffiths,et al.  Faint-Source Counts from Off-Source Fluctuation Analysis on Chandra Observations of the Hubble Deep Field-North , 2001, astro-ph/0111393.

[6]  Shiro Ueno,et al.  Chandra observations of the luminous infrared galaxy NGC 3256 , 2001, astro-ph/0109198.

[7]  D. M. Alexander,et al.  The Chandra Deep Field North Survey. V. 1 Ms Source Catalogs , 2001, astro-ph/0108404.

[8]  M. Garrett,et al.  The FIR/Radio correlation of high redshift galaxies in the region of the HDF-N , 2001, astro-ph/0108313.

[9]  A. Ptak,et al.  The Consequences of the Cosmic Star Formation Rate: X-Ray Number Counts , 2001, astro-ph/0108302.

[10]  M. Yun,et al.  Radio Properties of Infrared-selected Galaxies in the IRAS 2 Jy Sample , 2001, astro-ph/0102154.

[11]  T. Oosterbroek,et al.  BeppoSAX spectroscopy of the luminous X-ray sources in M33 , 2001, astro-ph/0101057.

[12]  Yasushi Fukazawa,et al.  Discovery of Spectral Transitions from Two Ultraluminous Compact X-Ray Sources in IC 342 , 2000, astro-ph/0011232.

[13]  Stuart Lumsden,et al.  Optical Classification of Southern Warm Infrared Galaxies , 2001 .

[14]  G. Hasinger,et al.  Testing current synthesis models of the X-ray background , 2000, astro-ph/0011341.

[15]  F. Ochsenbein,et al.  The VizieR database of astronomical catalogues , 2000, astro-ph/0002122.

[16]  D. Hogg,et al.  Caltech Faint Galaxy Redshift Survey. X. A Redshift Survey in the Region of the Hubble Deep Field North , 1999, astro-ph/9912048.

[17]  R. Terlevich,et al.  Luminous Infrared Galaxies. III. Multiple Merger, Extended Massive Star Formation, Galactic Wind, and Nuclear Inflow in NGC 3256 , 1999, astro-ph/9911019.

[18]  E. Richards.  The Nature of Radio Emission from Distant Galaxies: The 1.4 GHz Observations , 1999, astro-ph/9908313.

[19]  D. Helfand,et al.  X-Rays from NGC 3256: High-Energy Emission in Starburst Galaxies and Their Contribution to the Cosmic X-Ray Background , 1999, astro-ph/9907036.

[20]  A. Ptak,et al.  Hard X-Ray Variability in M82: Evidence for a Nascent Active Galactic Nucleus? , 1999, astro-ph/9903372.

[21]  T. Heckman,et al.  ASCA Observations of the Starburst-driven Superwind Galaxy NGC 2146: Broadband (0.6-9 keV) Spectral Properties , 1998, astro-ph/9810417.

[22]  ApJ, in press , 1999 .

[23]  E. A. Richards,et al.  Faint Radio Sources and Star Formation History , 1998, astro-ph/9904036.

[24]  Kimberly Ann Weaver,et al.  An X-Ray Minisurvey of Nearby Edge-on Starburst Galaxies. I. The Data , 1998 .

[25]  Astronomy,et al.  ROSAT and ASCA Observations of X-ray Luminous starburst Galaxies : NGC 3310 and NGC 3690 , 1998 .

[26]  R. B. Partridge,et al.  Radio Emission from Galaxies in the Hubble Deep Field , 1998, astro-ph/9803343.

[27]  Kazuhisa Mitsuda,et al.  ASCA Observation of Bright X-Ray Sources in the Nearby Spiral Galaxy IC 342 , 1998 .

[28]  Jr.,et al.  The Global Schmidt law in star forming galaxies , 1997, astro-ph/9712213.

[29]  T. Tsuru,et al.  Wide-Band X-Ray Spectra and Images of the Starburst Galaxy M82 , 1997, astro-ph/9712002.

[30]  T. Heckman,et al.  Starburst-driven Outflows in Low-Luminosity Galaxies: ASCA and ROSAT Observations of NGC 4449 , 1997 .

[31]  L. Ho,et al.  A Search for “Dwarf'' Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies , 1997, astro-ph/9704107.

[32]  T. Heckman,et al.  ASCA Observations of Starbursting Dwarf Galaxies: The Case of NGC 1569 , 1996 .

[33]  A. Sansom,et al.  ASCA observations of ‘the Antennae’ , 1996 .

[34]  G. Helou,et al.  A 1.425 GHz Atlas of the IRAS Bright Galaxy Sample, Part II , 1996 .

[35]  R. Norris,et al.  Radio Detection of a Double Nucleus in the Merging Galaxy NGC 3256 , 1995 .

[36]  Luis C. Ho,et al.  A Search for ``Dwarf'' Seyfert Nuclei. II. an Optical Spectral Atlas of the Nuclei of Nearby Galaxies , 1995 .

[37]  Kohji Tomisaka,et al.  X-Ray Emission from the Starburst Galaxy IC 342 , 1993 .

[38]  M. Malkan,et al.  The Extended 12-micron galaxy sample , 1993, astro-ph/9306013.

[39]  W. Forman,et al.  X-ray properties of bright far-infrared galaxies , 1992 .

[40]  James J. Condon,et al.  Radio Emission from Normal Galaxies , 1992 .

[41]  R. Windhorst,et al.  The micro-jansky radio source population at 5 GHz , 1991 .

[42]  P. Padovani,et al.  Star-forming galaxies and the X-ray background , 1990 .

[43]  George Helou,et al.  A 1. 49 GHz atlas of the IRAS Bright Galaxy Sample , 1990 .

[44]  R. Kron.  Evolution of the Universe of Galaxies: The Edwin Hubble Centennial Symposium , 1990 .

[45]  Giuseppina Fabbiano,et al.  X Rays From Normal Galaxies , 1989 .

[46]  G. Neugebauer,et al.  A catalog of IRAS observations of large optical galaxies , 1988 .

[47]  R. Tully.  Nearby Galaxies Catalog , 1988 .

[48]  G. Trinchieri,et al.  X-ray observations of spiral galaxies. II. Images and spectral parameters of 13 galaxies , 1987 .

[49]  S. Veilleux,et al.  Spectral Classification of Emission-Line Galaxies , 1986 .

[50]  George Helou,et al.  Thermal infrared and nonthermal radio: remarkable correlation in disks of galaxies , 1985 .

[51]  R. Kron,et al.  Sub-millijansky 1.4 GHz source counts and multicolor studies of weak radio galaxy populations , 1985 .

[52]  Richard E. Griffiths,et al.  X-ray emission from M82 , 1984 .

[53]  B. Webster,et al.  Abundance gradients in galaxies in the Sculptor and Centaurus groups , 1983 .

[54]  M. Rees,et al.  The contribution of young galaxies to the X-ray background , 1980 .

[55]  M. Johnston,et al.  X-ray observations of high-excitation emission-line galaxies with the HEAO 1 scanning modulation collimator , 1979 .

[56]  G. de Vaucouleurs,et al.  Second reference catalogue of bright galaxies , 1976 .

[57]  Martin Harwit,et al.  Infrared galaxies - Evolutionary stages of massive star formation , 1975 .

[58]  R. Haynes,et al.  A compendium of radio measurements of bright galaxies , 1975 .

[59]  V. Rubin,et al.  EMISSION-LINE INTENSITIES AND RADIAL VELOCITIES IN THE INTERACTING GALAXIES NGC 4038--4039. , 1970 .