Issue |
A&A
Volume 399, Number 1, February III 2003
|
|
---|---|---|
Page(s) | 39 - 50 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20021600 | |
Published online | 05 February 2003 |
The 2–10 keV luminosity as a Star Formation Rate indicator
1
Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
2
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
Corresponding author: P. Ranalli, ranalli@bo.astro.it
Received:
30
July
2002
Accepted:
4
November
2002
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.
Key words: X-rays: galaxies / radio continuum: galaxies / galaxies: high-redshift / infrared: galaxies / galaxies: fundamental parameters / galaxies: starburst
© ESO, 2003
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