The MUSE Extremely Deep Field: The cosmic web in emission at high redshift

被引：64

作者：

Bacon, R. ^{[1
]}

Mary, D. ^{[2
]}

Garel, T. ^{[1
,3
]}

Blaizot, J. ^{[1
]}

Maseda, M. ^{[4
]}

Schaye, J. ^{[4
]}

Wisotzki, L. ^{[5
]}

Conseil, S. ^{[6
]}

Brinchmann, J. ^{[4
,7
]}

Leclercq, F. ^{[3
]}

Abril-Melgarejo, V. ^{[9
]}

Boogaard, L. ^{[4
]}

Bouche, N. F. ^{[1
]}

Contini, T. ^{[8
]}

Feltre, A. ^{[1
,13
]}

Guiderdoni, B. ^{[1
]}

Herenz, C. ^{[14
]}

Kollatschny, W. ^{[10
]}

Kusakabe, H. ^{[3
]}

Matthee, J. ^{[11
]}

Michel-Dansac, L. ^{[1
]}

Nanayakkara, T. ^{[12
]}

Richard, J. ^{[1
]}

Roth, M. ^{[5
]}

Schmidt, K. B. ^{[5
]}

Steinmetz, M. ^{[5
]}

Tresse, L. ^{[1
]}

Urrutia, T. ^{[5
]}

Verhamme, A. ^{[3
]}

Weilbacher, P. M. ^{[5
]}

Zabl, J. ^{[1
]}

Zoutendijk, S. L. ^{[4
]}

机构：

[1] Univ Lyon1, Univ Lyon, Ctr Rech Astrophys Lyon, CNRS,ENS Lyon,UMR5574, F-69230 St Genis Laval, France

[2] Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, CS 34229, F-06304 Nice, France

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

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

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

[6] Gemini Observ, NSFs NOIRLab, Casilla 603, La Serena, Chile

[7] Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal

[8] Univ Toulouse, CNRS, Inst Rech Astrophys & Planetol, IRAP, 14 Ave Edouard Belin, F-31400 Toulouse, France

[9] Aix Marseille Univ, CNRS, LAM Lab Astrophys Marseille, UMR 7326, F-13388 Marseille, France

[10] Univ Gottingen, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[11] Swiss Fed Inst Technol, Inst Astron, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[12] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Melbourne, Vic 3122, Australia

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

[14] European Southern Observ, Av Alonso Cordova 3107, Santiago 7630355, Chile

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 647卷

基金：

欧洲研究理事会;

关键词：

galaxies: high-redshift; galaxies: groups: general; cosmology: observations; LY-ALPHA-EMISSION; UV LUMINOSITY FUNCTION; STAR-FORMING GALAXIES; SIMILAR-TO; 6; LARGE-SCALE STRUCTURE; LYMAN-BREAK GALAXIES; FAINT-END; COLD ACCRETION; SPECTROSCOPIC IDENTIFICATIONS; CIRCUMGALACTIC MEDIUM;

D O I：

10.1051/0004-6361/202039887

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of diffuse extended Ly alpha emission from redshift 3.1 to 4.5, tracing cosmic web filaments on scales of 2.5-4 cMpc. These structures have been observed in overdensities of Ly alpha emitters in the MUSE Extremely Deep Field, a 140 h deep MUSE observation located in the Hubble Ultra-Deep Field. Among the 22 overdense regions identified, five are likely to harbor very extended Ly alpha emission at high significance with an average surface brightness of 5x10(-20) erg s(-1) cm(-2) arcsec(-2). Remarkably, 70% of the total Ly alpha luminosity from these filaments comes from beyond the circumgalactic medium of any identified Ly alpha emitter. Fluorescent Ly alpha emission powered by the cosmic UV background can only account for less than 34% of this emission at z approximate to 3 and for not more than 10% at higher redshift. We find that the bulk of this diffuse emission can be reproduced by the unresolved Ly alpha emission of a large population of ultra low-luminosity Ly alpha emitters (< 10(40) erg s(-1)), provided that the faint end of the Ly<alpha> luminosity function is steep (alpha?-1.8), it extends down to luminosities lower than 10(38)-10(37) erg s(-1), and the clustering of these Ly alpha emitters is significant (filling factor < 1/6). If these Ly<alpha> emitters are powered by star formation, then this implies their luminosity function needs to extend down to star formation rates < 10(-4) M-<circle dot> yr(-1). These observations provide the first detection of the cosmic web in Ly alpha emission in typical filamentary environments and the first observational clue indicating the existence of a large population of ultra low-luminosity Ly alpha emitters at high redshift.

引用

页数：26

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