The VANDELS survey: a measurement of the average Lyman-continuum escape fraction of star-forming galaxies at z=3.5

被引：36

作者：

Begley, R. ^{[1
]}

Cullen, F. ^{[1
]}

McLure, R. J. ^{[1
]}

Dunlop, J. S. ^{[1
]}

Hall, A. ^{[1
]}

Carnall, A. C. ^{[1
]}

Hamadouche, M. L. ^{[1
]}

McLeod, D. J. ^{[1
]}

Amorin, R. ^{[2
,3
]}

Calabro, A. ^{[4
]}

Fontana, A. ^{[4
]}

Fynbo, J. P. U. ^{[5
]}

Guaita, L. ^{[4
,6
]}

Hathi, N. P. ^{[7
]}

Hibon, P. ^{[8
]}

Ji, Z. ^{[9
]}

Llerena, M. ^{[3
]}

Pentericci, L. ^{[4
]}

Saldana-Lopez, A. ^{[10
]}

Schaerer, D. ^{[10
]}

Talia, M. ^{[11
,12
]}

Vanzella, E. ^{[13
]}

Zamorani, G. ^{[13
]}

机构：

[1] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[2] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, La Serena 1305, Chile

[3] Univ La Serena, Dept Fis & Astron, Av Juan Cisternas 1200 Norte, La Serena, Chile

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

[5] Univ Copenhagen, Cosm Dawn Ctr, Niels Bohr Inst, Juliane Maries Vej 30, DK-2100 Copenhagen O, Denmark

[6] Univ Diego Portales, Fac Ingn, Nucleo Astron, Av Ejercito 441, Santiago, Chile

[7] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[8] European Southern Observ ESO, Vitacura 19001, Casilla, Chile

[9] Univ Massachusetts, Dept Astron, 710 N Pleasant Str, Amherst, MA 01003 USA

[10] Univ Geneva, Dept Astron, 51 Chemin Pegasi, CH-1290 Versoix, Switzerland

[11] INAF Osservatorio Astron Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy

[12] Univ Bologna, Dept Phys & Astron DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy

[13] INAF OAS Osservatorio Astrofis & Sci Spazio Bolog, Via Gobetti 93-3, I-40129 Bologna, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 513卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

galaxies: fundamental parameters; galaxies: high-redshift; intergalactic medium; LY-ALPHA EMISSION; UV LUMINOSITY FUNCTIONS; GAS COVERING FRACTION; SIMILAR-TO; 4; IONIZING-RADIATION; COSMIC REIONIZATION; DUST ATTENUATION; CIRCUMGALACTIC MEDIUM; STELLAR METALLICITY; EQUIVALENT WIDTH;

D O I：

10.1093/mnras/stac1067

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study designed to measure the average Lyman-continuum escape fraction (< f(esc)>) of star-forming galaxies at similar or equal to 3.5. We assemble a sample of 148 galaxies from the VANDELS spectroscopic survey at 3.35 <= z(spec) <= 3.95, selected to minimize line-of-sight contamination of their photometry. For this sample, we use ultra-deep, ground-based, U-band imaging and Hubble Space Telescope V-band imaging to robustly measure the distribution of R-obs = (L-LyC/L-UV)(obs). We then model the R-obs distribution as a function of < f(esc)>, carefully accounting for attenuation by dust, the intergalactic medium and the circumgalactic medium. A maximum likelihood fit to the R(obs )distribution returns a best-fitting value of < f(esc)> = 0.07(-0.02)(+0.02), a result confirmed using an alternative Bayesian inference technique (both techniques exclude < f(esc)> = 0.0 at >3 sigma). By splitting our sample in two, we find evidence that < f(esc)> is positively correlated with Ly a equivalent width (W-lambda(Ly alpha)), with high and low W-lambda(Ly alpha) subsamples returning values of < f(esc)> = 0.12(-0.04)(+0.06) and < f(esc)> = 0.02(-0.01)(+0.02), respectively. In contrast, we find evidence that < f(esc)> is anticorrelated with intrinsic UV luminosity and UV dust attenuation; with low UV luminosity and dust attenuation subsamples both returning best fits in the range 0.10 <= < f(esc)> <= 0.22. We do not find a clear correlation between f(esc) and galaxy stellar mass, suggesting stellar mass is not a primary indicator of f(esc). Although larger samples are needed to further explore these trends, our results suggest that it is entirely plausible that the low dust, low-metallicity galaxies found at z >= 6 will display the < f(esc)> >= 0.1 required to drive reionization.

引用

页码：3510 / 3525

页数：16

共 112 条

[1] Planck 2018 results: V. CMB power spectra and likelihoods [J].

Aghanim, N. ;

Akrami, Y. ;

Ashdown, M. ;

Aumont, J. ;

Baccigalupi, C. ;

Ballardini, M. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartolo, N. ;

Basak, S. ;

Benabed, K. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bock, J. J. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Boulanger, F. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Calabrese, E. ;

Cardoso, J. -F. ;

Carron, J. ;

Casaponsa, B. ;

Challinor, A. ;

Chiang, H. C. ;

Colombo, L. P. L. ;

Combet, C. ;

Crill, B. P. ;

Cuttaia, F. ;

de Bernardis, P. ;

de Rosa, A. ;

de Zotti, G. ;

Delabrouille, J. ;

Delouis, J. -M. ;

Di Valentino, E. ;

Diego, J. M. ;

Dore, O. ;

Douspis, M. ;

Ducout, A. ;

Dupac, X. ;

Dusini, S. ;

Efstathiou, G. ;

Elsner, F. ;

Ensslin, T. A. ;

Eriksen, H. K. ;

Fantaye, Y. ;

Fernandez-Cobos, R. .

ASTRONOMY & ASTROPHYSICS, 2020, 641

[2] The evolution of the X-ray luminosity functions of unabsorbed and absorbed AGNs out to z∼5 [J].

Aird, J. ;

Coil, A. L. ;

Georgakakis, A. ;

Nandra, K. ;

Barro, G. ;

Perez-Gonzalez, P. G. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 451 (02) :1892-1927

[3] The Chemical Composition of the Sun [J].

Asplund, Martin ;

Grevesse, Nicolas ;

Sauval, A. Jacques ;

Scott, Pat .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 47, 2009, 47 :481-522

[4]

Bertin E, 2011, ASTR SOC P, V442, P435

[5]

Bosman S.E.I., 2021, PREPRINT ARXIV210803

[6] New Determinations of the UV Luminosity Functions from z ∼ 9 to 2 Show a Remarkable Consistency with Halo Growth and a Constant Star Formation Efficiency [J].

Bouwens, R. J. ;

Oesch, P. A. ;

Stefanon, M. ;

Illingworth, G. ;

Labbe, I ;

Reddy, N. ;

Atek, H. ;

Montes, M. ;

Naidu, R. ;

Nanayakkara, T. ;

Nelson, E. ;

Wilkins, S. .

ASTRONOMICAL JOURNAL, 2021, 162 (02)

[7] UV LUMINOSITY FUNCTIONS AT REDSHIFTS z ∼ 4 TO z ∼ 10: 10,000 GALAXIES FROM HST LEGACY FIELDS [J].

Bouwens, R. J. ;

Illingworth, G. D. ;

Oesch, P. A. ;

Trenti, M. ;

Labbe, I. ;

Bradley, L. ;

Carollo, M. ;

van Dokkum, P. G. ;

Gonzalez, V. ;

Holwerda, B. ;

Franx, M. ;

Spitler, L. ;

Smit, R. ;

Magee, D. .

ASTROPHYSICAL JOURNAL, 2015, 803 (01) :1-49

[8] A lack of evolution in the very bright end of the galaxy luminosity function from z ≃ 8 to 10 [J].

Bowler, R. A. A. ;

Jarvis, M. J. ;

Dunlop, J. S. ;

McLure, R. J. ;

McLeod, D. J. ;

Adams, N. J. ;

Milvang-Jensen, B. ;

McCracken, H. J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 493 (02) :2059-2084

[9] ULTRA-DEEP KS-BAND IMAGING OF THE HUBBLE FRONTIER FIELDS [J].

Brammer, Gabriel B. ;

Marchesini, Danilo ;

Labbe, Ivo ;

Spitler, Lee ;

Lange-Vagle, Daniel ;

Barker, Elizbeth A. ;

Tanaka, Masayuki ;

Fontana, Adriano ;

Galametz, Audrey ;

Ferre-Mateu, Anna ;

Kodama, Tadayuki ;

Lundgren, Britt ;

Martis, Nicholas ;

Muzzin, Adam ;

Stefanon, Mauro ;

Toft, Sune ;

van der Wel, Arjen ;

Vulcani, Benedetta ;

Whitaker, Katherine E. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2016, 226 (01)

[10] The dust content and opacity of actively star-forming galaxies [J].

Calzetti, D ;

Armus, L ;

Bohlin, RC ;

Kinney, AL ;

Koornneef, J ;

Storchi-Bergmann, T .

ASTROPHYSICAL JOURNAL, 2000, 533 (02) :682-695

← 1 2 3 4 5 6 7 8 9 10 →