The MUSE &ITHubble&IT Ultra Deep Field Survey VI. The faint-end of the Lyα luminosity function at 2.91 < &ITz&IT < 6.64and implications for reionisation

被引：79

作者：

Drake, A. B. ^{[1
]}

Garel, T. ^{[1
]}

Wisotzki, L. ^{[2
]}

Leclercq, F. ^{[1
]}

Hashimoto, T. ^{[1
]}

Richard, J. ^{[1
]}

Bacon, R. ^{[1
]}

Blaizot, J. ^{[1
]}

Caruana, J. ^{[3
,4
]}

Conseil, S. ^{[1
]}

Contini, T. ^{[5
]}

Guiderdoni, B. ^{[1
]}

Herenz, E. C. ^{[2
,9
]}

Inami, H. ^{[1
]}

Lewis, J. ^{[1
]}

Mahler, G. ^{[1
]}

Marino, R. A. ^{[7
]}

Pello, R. ^{[5
]}

Schaye, J. ^{[6
]}

Verhamme, A. ^{[1
,8
]}

Ventou, E. ^{[5
]}

Weilbacher, P. M. ^{[2
]}

机构：

[1] Univ Lyon l, ENS Lyon, CNRS, Ctr Rech Astrophys Lyon UMR 5574, F-69230 St Genis Laval, France

[2] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[3] Univ Malta, Dept Phys, MSD-2080 Msida, Malta

[4] Univ Malta, Inst Space Sci & Astron, MSD-2080 Msida, Malta

[5] Univ Toulouse, UPS, IRAP, CNRS, F-31400 Toulouse, France

[6] Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[7] ETH, Inst Astron, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[8] Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland

[9] Stockholm Univ, Dept Astron, S-10691 Stockholm, Sweden

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 608卷

基金：

欧洲研究理事会;

关键词：

galaxies: luminosity function; mass function; galaxies: evolution; early Universe; dark ages; reionization; first stars; galaxies: formation; STAR-FORMING GALAXIES; Z-SIMILAR-TO-6; QUASARS; EMITTING GALAXIES; EMITTERS; EVOLUTION; UNIVERSE; SAMPLE; HALOES;

D O I：

10.1051/0004-6361/201731431

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the deepest study to date of the Ly alpha luminosity function in a blank field using blind integral field spectroscopy from MUSE. We constructed a sample of 604 Ly alpha emitters (LAEs) across the redshift range 2.91 < z < 6.64 using automatic detection software in the Hubble Ultra Deep Lield. The deep data cubes allowed us to calculate accurate total Ly alpha fluxes capturing low surface-brightness extended Ly alpha emission now known to be a generic property of high-redshift star-forming galaxies. We simulated realistic extended LAEs to fully characterise the selection function of our samples, and performed flux-recovery experiments to test and correct for bias in our determination of total Ly alpha fluxes. We find that an accurate completeness correction accounting for extended emission reveals a very steep faint-end slope of the luminosity function, alpha, down to luminosities of log(10) L erg s(-1) < 41.5, applying both the 1/V-max and maximum likelihood estimators. Splitting the sample into three broad redshift bins, we see the faint-end slope increasing from -2.03(-0.07)(+1.42) at z approximate to 3.44 to -2.86(-infinity)(+0.76) Z approximate to 76 at z approximate to 5.48, however no strong evolution is seen between the 68% confidence regions in L*-alpha parameter space. Using the Ly alpha line flux as a proxy for star formation activity, and integrating the observed luminosity functions, we find that LAEs' contribution to the cosmic star formation rate density rises with redshift until it is comparable to that from continuum-selected samples by z approximate to 6. This implies that LAEs may contribute more to the star-formation activity of the early Universe than previously thought, as any additional intergalactic medium (IGM) correction would act to further boost the Ly alpha luminosities. Linally, assuming fiducial values for the escape of Ly alpha and LyC radiation, and the dumpiness of the IGM, we integrated the maximum likelihood luminosity function at 5.00 < z < 6.64 and find we require only a small extrapolation beyond the data (<1 dex in luminosity) for LAEs alone to maintain an ionised IGM at z approximate to 6.

引用

页数：15

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