2002/11/30 by P. Ranalli, A. Comastri, G. Setti · 21 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Far infrared #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble Deep Field #Infrared #Luminosity #Luminous infrared galaxy #Radio galaxy #Star formation #astro-ph
paper · pdf · doi:10.1051/0004-6361:20021600
published as Astron.Astrophys.399:39-50,2003 · Revised version: corrected typos in tables 1 and 2, one reference added. 13 pages, 7 figures. Astronomy & Astrophysics, in press. LaTeX, aa.cls included
arxiv created 2003/01/10 · openalex publication_date 2003/02/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 NGC 3256 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 FIR and 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 () 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.