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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
3D-HST grism spectroscopy of a gravitationally lensed, low-metallicity starburst galaxy at z = 1.847
Astrophysical Journal Letters, Volume 758, No. 1, Article L17, Year 2012
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Description
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-HST WFC3/G141 near-infrared spectrum of the lens reveals the source of this discrepancy to be extremely strong [O III] λ5007 and Hβ emission lines with rest-frame equivalent widths of 2000 ± 100 and 520 ± 40 Å, respectively. The source has a stellar mass 10 8 M, sSFR 100 Gyr-1, and detection of [O III] λ4363 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 re 300pc, 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. © 2012. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Brammer, Gabriel B.
Chile, Santiago
European Southern Observatory Santiago
Sánchez-Janssen, Rubén
Chile, Santiago
European Southern Observatory Santiago
Labbé, Ivo
Netherlands, Leiden
Universiteit Leiden
da Cunha, Elisabete
Germany, Heidelberg
Max Planck Institute for Astronomy
Franx, Marijn
Netherlands, Leiden
Universiteit Leiden
Fumagalli, Mattia
Netherlands, Leiden
Universiteit Leiden
Lundgren, Britt Fisher
United States, New Haven
Yale University
Marchesini, Danilo M.
United States, Medford
Tufts University
Momcheva, Ivelina G.
United States, New Haven
Yale University
Nelson, Erica June
United States, New Haven
Yale University
Patel, Shannon G.
Netherlands, Leiden
Universiteit Leiden
Quadri, Ryan F.
United States, Pasadena
Carnegie Observatories
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Skelton, Rosalind E.
United States, New Haven
Yale University
Schmidt, Kasper Borello
Germany, Heidelberg
Max Planck Institute for Astronomy
van der Wel, Arjen
Germany, Heidelberg
Max Planck Institute for Astronomy
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Wake, David A.
United States, New Haven
Yale University
Whitaker, Katherine E.
United States, New Haven
Yale University
Statistics
Citations: 70
Authors: 19
Affiliations: 7
Identifiers
Doi:
10.1088/2041-8205/758/1/L17
ISSN:
20418213
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative