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Correlations among Multi-Wavelength Luminosities of Star-Forming Galaxies | | Yu-Qing Lou
; Fu-Yan Bian (Physics Department
; the Tsinghua Center for Astrophysics
; | | Date: |
8 Dec 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 358 (2005) 1231-1239 | | Subject: | astro-ph | | Affiliation: | 1 2 and 3) and Fu-Yan Bian (Physics Department and the Tsinghua Center for Astrophysics (THCA), Tsinghua University, National Astronomical Observatories, Chinese Academy of Sciences, Department of Astronomy and Astrophysics, The University of Chicago | | Abstract: | It has been known for two decades that a tight correlation exists between far-infrared (FIR) and radio (1.4 and 4.8 GHz) global fluxes/luminosities from galaxies, which may be explained in terms of massive star formation activities in these galaxies. For this very reason, a correlation might also exist between X-ray and FIR/radio global luminosities of galaxies. We analyze data from {it ROSAT} All-Sky Survey and {it IRAS} to show that such correlation does indeed exist between FIR (42.5$-122.5mu$m) and soft X-ray (0.1$-$2.4keV) luminosities in active star-forming galaxies (ASFGs).In order to establish a physical connection between the $L_{
mX}-L_{
m FIR}$ correlation and global star formation rate (SFR) in galaxies, we empirically derive both $L_{
m X}-L_{
m B}$ and $L_{
m FIR}-L_{
m B}$ relations. Futhermore, we propose a relation between soft X-ray luminosity and SFR in star-forming galaxies. To further understand the $L_{
m X}-L_{
m FIR}$ relation, we construct an empirical model in which both FIR and X-ray emissions consist of two components with one being closely associated with star formation and the other not. | | Source: | arXiv, astro-ph/0412172 | | Services: | Forum | Review | PDF | Favorites | |
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