Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane

The source of energetic photons that heated and reionized the early Universe remains uncertain. Early galaxies had low metallicity and recent population synthesis calculations suggest that the number and luminosity of high-mass X-ray binaries are enhanced in star-forming galaxies with low metallicit...

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Guardado en:
Detalles Bibliográficos
Publicado: 2016
Materias:
Galaxies: starburst
X-rays: binaries
X-rays: galaxies
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v457_n4_p4081_Brorby
http://hdl.handle.net/20.500.12110/paper_00358711_v457_n4_p4081_Brorby
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v457_n4_p4081_Brorby
record_format dspace
spelling paper:paper_00358711_v457_n4_p4081_Brorby2023-06-08T15:01:42Z Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane Galaxies: starburst X-rays: binaries X-rays: galaxies The source of energetic photons that heated and reionized the early Universe remains uncertain. Early galaxies had low metallicity and recent population synthesis calculations suggest that the number and luminosity of high-mass X-ray binaries are enhanced in star-forming galaxies with low metallicity, offering a potentially important and previously overlooked source of heating and reionization. Lyman break analogue (LBA) galaxies are local galaxies that strongly resemble the high-redshift, star-forming Lyman break galaxies and have been suggested as local analogues to these metal-deficient galaxies found in the early Universe. We studied a sample of 10 LBAs in order to measure the relation between star formation rate and Xray luminosity. We found that for LBAs with metallicities in the range 12 + log10(O/H) = 8.15-8.80, the LX -SFR relation was log10(LX/SFR [erg s-1 M-1 ⊙ yr]) = 39.85(±0.10) in the 0.5-8 keV band with a dispersion of σ = 0.25 dex. This is an enhancement of nearly a factor of 2 in the L0.5-8 keV-SFR relation relative to results for nearby, near-solar metallicity galaxies. The enhancement is significant at the 98.2 per cent level (2.4σ). Our enhanced LX/SFR relation is consistent with themetallicity-dependent predicted value from population synthesis models. We discuss the possibility of an LX-SFR-metallicity plane for star-forming galaxies. These results are important to our understanding of reionization and the formation of early galaxies. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v457_n4_p4081_Brorby http://hdl.handle.net/20.500.12110/paper_00358711_v457_n4_p4081_Brorby
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: starburst
X-rays: binaries
X-rays: galaxies
spellingShingle Galaxies: starburst
X-rays: binaries
X-rays: galaxies
Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
topic_facet Galaxies: starburst
X-rays: binaries
X-rays: galaxies
description The source of energetic photons that heated and reionized the early Universe remains uncertain. Early galaxies had low metallicity and recent population synthesis calculations suggest that the number and luminosity of high-mass X-ray binaries are enhanced in star-forming galaxies with low metallicity, offering a potentially important and previously overlooked source of heating and reionization. Lyman break analogue (LBA) galaxies are local galaxies that strongly resemble the high-redshift, star-forming Lyman break galaxies and have been suggested as local analogues to these metal-deficient galaxies found in the early Universe. We studied a sample of 10 LBAs in order to measure the relation between star formation rate and Xray luminosity. We found that for LBAs with metallicities in the range 12 + log10(O/H) = 8.15-8.80, the LX -SFR relation was log10(LX/SFR [erg s-1 M-1 ⊙ yr]) = 39.85(±0.10) in the 0.5-8 keV band with a dispersion of σ = 0.25 dex. This is an enhancement of nearly a factor of 2 in the L0.5-8 keV-SFR relation relative to results for nearby, near-solar metallicity galaxies. The enhancement is significant at the 98.2 per cent level (2.4σ). Our enhanced LX/SFR relation is consistent with themetallicity-dependent predicted value from population synthesis models. We discuss the possibility of an LX-SFR-metallicity plane for star-forming galaxies. These results are important to our understanding of reionization and the formation of early galaxies. © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
title Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
title_short Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
title_full Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
title_fullStr Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
title_full_unstemmed Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane
title_sort enhanced x-ray emission from lyman break analogues and a possible lx-sfr-metallicity plane
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v457_n4_p4081_Brorby
http://hdl.handle.net/20.500.12110/paper_00358711_v457_n4_p4081_Brorby
_version_ 1768544076547751936

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