English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Based on recent work on spectral decomposition of the emission ofstar-forming galaxies, we assess whether the integrated 2-10 keV emission fromhigh-mass X-ray binaries (HMXBs), L_{2-10}^{HMXB}, can be used as a reliableestimator of ongoing star formation rate (SFR). Using a sample of 46 local (z <0.1) star forming galaxies, and spectral modeling of ASCA, BeppoSAX, andXMM-Newton data, we demonstrate the existence of a linear SFR-L_{2-10}^{HMXB}relation which holds over ~5 decades in X-ray luminosity and SFR. The total2-10 keV luminosity is not a precise SFR indicator because at low SFR (i.e., innormal and moderately-starbursting galaxies) it is substantially affected bythe emission of low-mass X-ray binaries, which do not trace the current SFR dueto their long evolution lifetimes, while at very high SFR (i.e., for veryluminous FIR-selected galaxies) it is frequently affected by the presence ofstrongly obscured AGNs. The availability of purely SB-powered galaxies - whose2-10 keV emission is mainly due to HMXBs - allows us to properly calibrate theSFR-L_{2-10}^{HMXB} relation. The SFR-L_{2-10}^{HMXB} relation holds also fordistant (z ~ 1) galaxies in the Hubble Deep Field North sample, for which welack spectral information, but whose SFR can be estimated from deep radio data.If confirmed by more detailed observations, it may be possible to use thededuced relation to identify distant galaxies that are X-ray overluminous fortheir (independently estimated) SFR, and are therefore likely to hide stronglyabsorbed AGNs.Comment: Astronomy & Astrophysics, in press (15 pages, 7 figures, 4 tables

2–10 keV luminosity of high-mass binaries as a gauge of ongoing star-formation rate