Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-16
Mon.Not.Roy.Astron.Soc.347:L57,2004
Astronomy and Astrophysics
Astrophysics
revised, accepted for publication in MNRAS Letters
Scientific paper
10.1111/j.1365-2966.2004.07450.x
We compare the results of Grimm et al. (2003) and Ranalli et al. (2003) on the Lx-SFR relation in normal galaxies. Based on the Lx-stellar mass dependence for LMXBs, we show, that low SFR (SFR<1 Msun/year) galaxies in the Ranalli et al. sample are contaminated by the X-ray emission from low mass X-ray binaries, unrelated to the current star formation activity. The most important conclusion from our comparison is, however, that after the data are corrected for the ``LMXB contamination'', the two datasets become consistent with each other, despite of their different content, variability effects, difference in the adopted source distances, X-ray flux and star formation rate determination and in the cosmological parameters used in interpreting the HDF-N data. They also agree well, both in the low and high SFR regimes, with the predicted Lx-SFR dependence derived from the parameters of the ``universal'' HMXB luminosity function. This encouraging result emphasizes the potential of the X-ray luminosity as an independent star formation rate indicator for normal galaxies.
Gilfanov Marat
Grimm Hans-Jakob
Sunyaev Rachid
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