The MUSE &ITHubble&IT Ultra Deep Field Survey IV. Global properties of C III] emitters

被引:55
作者
Maseda, Michael V. [1 ]
Brinchmann, Jarle [1 ,2 ]
Franx, Marijn [1 ]
Bacon, Roland [3 ]
Bouwens, Rychard J. [1 ]
Schmidt, Kasper B. [4 ]
Boogaard, Leindert A. [1 ]
Contini, Thierry [5 ,6 ]
Feltre, Anna [3 ]
Inami, Hanae [3 ]
Kollatschny, Wolfram [7 ]
Marino, Raffaella A. [8 ]
Richard, Johan [3 ]
Verhamme, Anne [3 ,9 ]
Wisotzki, Lutz [4 ]
机构
[1] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
[2] Univ Porto, CAUP, Rua Estrelas, P-4150762 Oporto, Portugal
[3] Univ Lyon 1, ENS Lyon, CNRS, Ctr Rech Astrophys Lyon UMR5574, F-69230 St Genis Laval, France
[4] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
[5] CNRS, IRAP, 14 Ave Edouard Belin, F-31400 Toulouse, France
[6] Univ Toulouse, UPS OMP, F-31400 Toulouse, France
[7] Univ Gottingen, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
[8] ETH, Inst Astron, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland
[9] Univ Geneva, Observ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland
基金
美国国家科学基金会; 瑞士国家科学基金会; 美国国家航空航天局;
关键词
galaxies: high-redshift; intergalactic medium; galaxies: evolution; STAR-FORMING GALAXIES; EMISSION-LINE DIAGNOSTICS; LYMAN-ALPHA EMISSION; LY-ALPHA; LUMINOSITY FUNCTION; COSMIC REIONIZATION; PHYSICAL-PROPERTIES; NO EVIDENCE; TO; REDSHIFT;
D O I
10.1051/0004-6361/201730985
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The C III] lambda lambda 1907, 1909 emission doublet has been proposed as an alternative to Lyman-alpha in redshift confirmations of galaxies at z greater than or similar to 6 since it is not attenuated by the largely neutral intergalactic medium at these redshifts and is believed to be strong in the young, vigorously star-forming galaxies present at these early cosmic times. We present a statistical sample of 17 C III]-emitting galaxies beyond z similar to 1.5 using similar to 30 h deep VLT/MUSE integral field spectroscopy covering 2 square arcminutes in the Hubble Deep field South (HDFS) and Ultra Deep Field (UDF), achieving C III] sensitivities of similar to 2 x 10(-17) erg s(-1) cm(-2) in the HDFS and similar to 7 x 10(-18) erg s(-1) cm(-2) in the UDF. The rest-frame equivalent widths range from 2 to 19 angstrom. These 17 galaxies represent similar to 3% of the total sample of galaxies found between 1.5 less than or similar to z less than or similar to 4. They also show elevated star formation rates, lower dust attenuation, and younger mass-weighted ages than the general population of galaxies at the same redshifts. Combined with deep slitless grism spectroscopy from the HST/WFC3 in the UDF, we can tie the rest-frame ultraviolet C III] emission to rest-frame optical emission lines, namely [O III] lambda 5007, finding a strong correlation between the two. Down to the flux limits that we observe (similar to 1 x 10(-18) erg s(-1) cm(-2) with the grism data in the UDF), all objects with a rest-frame [O III] lambda lambda 4959, 5007 equivalent width in excess of 250 angstrom, the so-called extreme emission line galaxies, have detections of C III] in our MUSE data. More detailed studies of the C III]-emitting population at these intermediate redshifts will be crucial to understand the physical conditions in galaxies at early cosmic times and to determine the utility of C III] as a redshift tracer.
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页数:16
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