3D-HST GRISM SPECTROSCOPY OF A GRAVITATIONALLY LENSED, LOW-METALLICITY STARBURST GALAXY AT z=1.847

被引：71

作者：

Brammer, Gabriel B. ^{[1
]}

Sanchez-Janssen, Ruben ^{[1
]}

Labbe, Ivo ^{[2
]}

da Cunha, Elisabete ^{[3
]}

Erb, Dawn K. ^{[4
]}

Franx, Marijn ^{[2
]}

Fumagalli, Mattia ^{[2
]}

Lundgren, Britt ^{[5
]}

Marchesini, Danilo ^{[6
]}

Momcheva, Ivelina ^{[5
]}

Nelson, Erica ^{[5
]}

Patel, Shannon ^{[2
]}

Quadri, Ryan ^{[7
]}

Rix, Hans-Walter ^{[3
]}

Skelton, Rosalind E. ^{[5
]}

Schmidt, Kasper B. ^{[3
]}

van der Wel, Arjen ^{[3
]}

van Dokkum, Pieter G. ^{[5
]}

Wake, David A. ^{[5
]}

Whitaker, Katherine E. ^{[5
]}

机构：

[1] European So Observ, Santiago, Chile

[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA

[5] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[6] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA

[7] Carnegie Observ, Pasadena, CA 91101 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 758卷 / 01期

基金：

美国国家航空航天局; 欧洲研究理事会;

关键词：

galaxies: dwarf; galaxies: formation; galaxies: high-redshift; galaxies: starburst; EMISSION-LINE GALAXIES; STAR-FORMING GALAXIES; SPACE-TELESCOPE OBSERVATIONS; CHEMICAL-COMPOSITION; SBS; 0335-052; DUST; YOUNG; STELLAR; CANDELS; FIELD;

D O I：

10.1088/2041-8205/758/1/L17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Hubble Space Telescope (HST) imaging and spectroscopy of the gravitational lens SL2SJ02176-0513, a cusp arc at z = 1.847. The UV continuum of the lensed galaxy is very blue, which is seemingly at odds with its redder optical colors. The 3D-HSTWFC3/G141 near-infrared spectrum of the lens reveals the source of this discrepancy to be extremely strong [OIII]lambda 5007 and H beta emission lines with rest-frame equivalent widths of 2000 +/- 100 and 520 +/- 40 angstrom, respectively. The source has a stellar mass similar to 10(8) M-circle dot, sSFR similar to 100 Gyr(-1), and detection of [OIII]lambda 4363 yields a metallicity of 12 + log (O/H) = 7.5 +/- 0.2. We identify local blue compact dwarf analogs to SL2SJ02176-0513, which are among the most metal-poor galaxies in the Sloan Digital Sky Survey. The local analogs resemble the lensed galaxy in many ways, including UV/optical spectral energy distribution, spatial morphology, and emission line equivalent widths and ratios. Common to SL2SJ02176-0513 and its local counterparts is an upturn at mid-IR wavelengths likely arising from hot dust heated by starbursts. The emission lines of SL2SJ02176-0513 are spatially resolved owing to the combination of the lens and the high spatial resolution of HST. The lensed galaxy is composed of two clumps with combined size r(e) similar to 300 pc, and we resolve significant differences in UV color and emission line equivalent width between them. Though it has characteristics occasionally attributed to active galactic nuclei, we conclude that SL2SJ02176-0513 is a low-metallicity star-bursting dwarf galaxy. Such galaxies will be found in significant numbers in the full 3D-HST grism survey.

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