Abstract:
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.
Registro:
| Documento: |
Artículo
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| Título: | Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane |
| Autor: | Brorby, M.; Kaaret, P.; Prestwich, A.; Mirabel, I.F. |
| Filiación: | Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, United States
Harvard-Smithsonian Center for Astrophysics, 60 Garden street, Cambridge, MA 02138, United States
Instituto de Astronomía y Física del Espacio (IAFE), UBA-CONICET, CC 67, Suc. 28, Buenos Aires, C1428ZAA, Argentina
CEA-Saclay, IRFU/DSM/Service d'Astrophysique, Gif-sur-Yvette, F-91191, France
|
| Palabras clave: | Galaxies: starburst; X-rays: binaries; X-rays: galaxies |
| Año: | 2016
|
| Volumen: | 457
|
| Número: | 4
|
| Página de inicio: | 4081
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| Página de fin: | 4088
|
| DOI: |
http://dx.doi.org/10.1093/mnras/stw284 |
| Título revista: | Monthly Notices of the Royal Astronomical Society
|
| Título revista abreviado: | Mon. Not. R. Astron. Soc.
|
| ISSN: | 00358711
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| CODEN: | MNRAA
|
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v457_n4_p4081_Brorby |
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Citas:
---------- APA ----------
Brorby, M., Kaaret, P., Prestwich, A. & Mirabel, I.F.
(2016)
. Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane. Monthly Notices of the Royal Astronomical Society, 457(4), 4081-4088.
http://dx.doi.org/10.1093/mnras/stw284---------- CHICAGO ----------
Brorby, M., Kaaret, P., Prestwich, A., Mirabel, I.F.
"Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane"
. Monthly Notices of the Royal Astronomical Society 457, no. 4
(2016) : 4081-4088.
http://dx.doi.org/10.1093/mnras/stw284---------- MLA ----------
Brorby, M., Kaaret, P., Prestwich, A., Mirabel, I.F.
"Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane"
. Monthly Notices of the Royal Astronomical Society, vol. 457, no. 4, 2016, pp. 4081-4088.
http://dx.doi.org/10.1093/mnras/stw284---------- VANCOUVER ----------
Brorby, M., Kaaret, P., Prestwich, A., Mirabel, I.F. Enhanced X-ray emission from Lyman break analogues and a possible LX-SFR-metallicity plane. Mon. Not. R. Astron. Soc. 2016;457(4):4081-4088.
http://dx.doi.org/10.1093/mnras/stw284
