C III] λ1909 emission as an alternative to Ly α in the reionization era: the dependence of C iii] and Ly α at 3 < z < 4 from the VANDELS survey

被引：0

作者：

Cunningham, M. H. ^{[1
]}

Saxena, A. ^{[1
,2
]}

Ellis, R. S. ^{[1
]}

Pentericci, L. ^{[3
]}

机构：

[1] UCL, Dept Phys & Astron, London WC1E 6BT, England

[2] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[3] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 530卷 / 02期

基金：

欧洲研究理事会; 英国科研创新办公室;

关键词：

galaxies: evolution; galaxies: high-redshift; STAR-FORMING GALAXIES; MICROWAVE BACKGROUND CONSTRAINTS; LOW-MASS GALAXIES; SIMILAR-TO; 3.5; EMITTING GALAXIES; PHOTOMETRIC REDSHIFTS; ULTRAVIOLET-SPECTRA; PHYSICAL-PROPERTIES; IONIZING-RADIATION; FAINT GALAXIES;

D O I：

10.1093/mnras/stae939

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The velocity offset of Ly alpha emission from a galaxy's systemic redshift is an excellent tracer of conditions that enable the escape of Ly alpha photons from the galaxy, and potentially the all-important hydrogen ionizing Lyman continuum photons. However at z >= 6, Ly alpha is often heavily attenuated by the neutral intergalactic medium. Here we investigate the utility of CIII] lambda lambda 1907, 1909 emission, usually the brightest ultraviolet (UV) line after Ly alpha, as a proxy estimating the Ly alpha velocity offset (Delta v(Ly alpha)). To do so, we use analogues of reionization era galaxies based upon 52 star-forming galaxies with robust CIII] detections drawn from the VANDELS survey. Our sample spans a broad UV magnitude range of -18.5 < M-UV < -22.0, with a sample average value of EW(CIII]) = 5.3 & Aring;. We find a slight increase of EW(CIII]) with increasing EW(Ly alpha), but find a large range of EW(CIII]) similar to 1-13 & Aring; particularly at EW(Ly alpha) < 10 & Aring;. Using the CIII] line peak as the systemic redshift, we calculate Delta v(Ly alpha) and recover the previously reported trend of decreasing Delta v(Ly alpha) with increasing EW(Ly alpha). Interestingly, we find an anticorrelation between Delta v(Ly alpha) and EW(CIII]), which also displays a dependence on the UV absolute magnitude. We derive a multivariate fit to obtain Delta v(Ly alpha) using both EW(CIII]) and M-UV, finding that Delta v(Ly alpha) is more strongly dependent on EW(CIII]), with a weaker but non-negligible dependence on M-UV. We find that for a fixed EW(CIII]), UV-bright Ly alpha emitting galaxies show smaller values of Delta v(Ly alpha),which suggests that such galaxies may be undergoing more bursty star-formation compared to the UV-fainter ones, akin to a population of extremely UV-bright galaxies identified at z > 10.

引用

页码：1592 / 1602

页数：11

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