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Date and Time of the Query: 2019-08-22 T11:12:17 PDT
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For refcode 2005MNRAS.358.1231L:
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NED Abstract

Copyright by Royal Astronomical Society. 2005MNRAS.358.1231L Correlations among multiwavelength luminosities of star-forming galaxies Lou, Yu-Qing; Bian, Fu-Yan Abstract. It has been known for two decades that a tight correlation exists between global far-infrared (FIR) and radio continuum (1.4 and 4.8 GHz) fluxes/luminosities from star-forming galaxies, which may be explained by formation activities of massive stars in these galaxies. For this very reason, a correlation might also exist between X-ray and FIR/radio global luminosities of galaxies. We analyse data from the ROSAT All-Sky Survey and from IRAS to show that such correlation does indeed exist between FIR (42.5-122.5{micron}) and soft X-ray (0.1-2.4 keV) luminosities L_X_ and L_FIR_ in 17 normal star-forming galaxies (NSFGs), including 16 late-type galaxies and one host-dominant Seyfert galaxy, as well as in 14 active star-forming galaxies (ASFGs) consisting of starburst-dominant Seyfert galaxies. The quantitative difference in such correlations in NSFGs and in ASFGs may be interpreted in terms of evolutionary variations from classic starburst galaxies to starburst-dominant Seyfert galaxies. Meanwhile, some low-luminosity active galactic nuclei (LLAGNs) tend to exhibit such a correlation that we infer for star-forming galaxies, implying that star-forming activities might be more dominant in LLAGNs. In contrast, AGN-dominant Seyfert galaxies do not show such a L_X_ versus L_FIR_ correlation; this is most likely related to accretions towards supermassive black holes (SMBHs) in galactic nuclei. In order to establish a physical connection between the L_X_-L_FIR_ correlation and global star formation rate (SFR) in galaxies, we empirically derive both L_X_-L_B_ and L_FIR_-L_B_ relations with the blue-band luminosity L_B_ roughly representing the mass of a galaxy. It appears that the more massive galaxies are, the more star formation regions exist in these galaxies. The global SFR is not only associated with the mass of a galaxy but also closely related to the level of star-forming activities therein. We propose a relation between soft X-ray luminosity and SFR in star-forming galaxies. In order to probe the L_X_-L_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 one not. Based on this model, we infer a linear relation between FIR/soft X-ray in star formation regions and radio luminosities, and get a linear relation between L_X_ and L_FIR_ for star-forming regions.
Retrieve 80 NED objects in this reference.
Please click here for ADS abstract

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