Soft X-ray to Far Infrared luminosities ratio in star-forming galaxies
| dc.creator | Mas-Hesse, J. M. | |
| dc.creator | Oti-Floranes, H. | |
| dc.creator | Cerviño, M. | |
| dc.date | 2008-01-21 | |
| dc.date | 2008-03-13 | |
| dc.date.accessioned | 2026-07-07T09:26:19Z | |
| dc.date.available | 2026-07-07T09:26:19Z | |
| dc.description | A good correlation has been found in star-forming galaxies between the soft X-ray and the far infrared or radio luminosities. In this work we analyze the relation between the soft X-ray and far infrared luminosities as predicted by evolutionary population synthesis models, aiming first to test the validity of the soft X-ray luminosity as a star formation rate estimator, using the already known calibration of the FIR luminosity as a proxy, and second proposing a calibration based on the predictions of evolutionary synthesis models. We have computed the soft X-ray and far infrared luminosities expected for a massive starburst as a function of evolutionary state, efficiency of the conversion of mechanical energy into soft X-ray luminosity, star formation regime (instantaneous or extended) and dust abundance, and have compared the predictions with observational values for a sample of 62 star-forming galaxies taken from the literature. The observational Lsoftx/Lfir ratios are consistent with the predictions by the models under realistic assumptions (young starbursts, efficiency in the re-processing of mechanical energy of few percent), confirming the direct relation of the diffuse soft X-ray emission with the star formation episode. The soft X-ray emission of the diffuse, extended gas surrounding massive star forming regions can be used as a Star Formation Rate estimator. The empirical calibrations presented in the literature are supported by the predictions of evolutionary synthesis models and by the analysis of a larger sample of star-forming galaxies, but it is biased towards galaxies dominated by relatively unevolved starbursts. | |
| dc.description | 8 pages, 6 figures. Accepted by Astronomy and Astrophysics. New version including language style revision and 3 new references | |
| dc.identifier | https://arxiv.org/abs/0801.3192 | |
| dc.identifier | http://arxiv.org/abs/0801.3192 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/156713 | |
| dc.subject | Astrophysics | |
| dc.title | Soft X-ray to Far Infrared luminosities ratio in star-forming galaxies | |
| dc.type | text |