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http://hdl.handle.net/20.500.12386/32243
Titolo: | The VANDELS Survey: new constraints on the high-mass X-ray binary populations in normal star-forming galaxies at 3 < z < 5.5 | Autori: | SAXENA, AAYUSH Ellis, R. S. Förster, P. U. Calabrò, A. PENTERICCI, Laura Carnall, A. C. CASTELLANO, MARCO Cullen, F. FONTANA, Adriano Franco, M. Fynbo, J. P. U. GARGIULO, ADRIANA GARILLI, BIANCA MARIA ROSA Hathi, N. P. McLeod, D. J. Amorín, R. Zamorani, G. |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 505 | Fascicolo: | 4 | Da pagina:: | 4798 | Abstract: | We use VANDELS spectroscopic data overlapping with the ≃7 Ms Chandra Deep Field South survey to extend studies of high-mass X-ray binary systems (HMXBs) in 301 normal star-forming galaxies in the redshift range 3 < z < 5.5. Our analysis evaluates correlations between X-ray luminosities (L<SUB>X</SUB>), star formation rates (SFRs), and stellar metallicities (Z<SUB>⋆</SUB>) to higher redshifts and over a wider range in galaxy properties than hitherto. Using a stacking analysis performed in bins of both redshift and SFR for sources with robust spectroscopic redshifts without AGN signatures, we find convincing evolutionary trends in the ratio L<SUB>X</SUB>/SFR to the highest redshifts probed, with a stronger trend for galaxies with lower SFRs. Combining our data with published samples at lower redshift, the evolution of L<SUB>X</SUB>/SFR to z ≃ 5 proceeds as (1 + z)<SUP>1.03 ± 0.02</SUP>. Using stellar metallicities derived from photospheric absorption features in our spectroscopic data, we confirm indications at lower redshifts that L<SUB>X</SUB>/SFR is stronger for metal-poor galaxies. We use semi-analytic models to show that metallicity dependence of L<SUB>X</SUB>/SFR alone may not be sufficient to fully explain the observed redshift evolution of X-ray emission from HMXBs, particularly for galaxies with SFR < 30 M<SUB>⊙</SUB> yr<SUP>-1</SUP>. We speculate that reduced overall stellar ages and 'burstier' star formation histories in the early Universe may lead to higher L<SUB>X</SUB>/SFR for the same metallicity. We then define the redshift-dependent contribution of HMXBs to the integrated X-ray luminosity density and, in comparison with models, find that the contribution of HMXBs to the cosmic X-ray background at z > 6 may be ≳0.25 dex higher than previously estimated. | URI: | http://hdl.handle.net/20.500.12386/32243 | URL: | https://academic.oup.com/mnras/article/505/4/4798/6289930 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab1575 | Bibcode ADS: | 2021MNRAS.505.4798S | Fulltext: | open |
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