| タイトル | Spatially-Resolved HST GRISM Spectroscopy of a Lensed Emission Line Galaxy at Z to approximately 1 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20120014165 |
| 著者（英） | Coe, Dan; Broadhurst, Tom; Straughn, Amber; Meurer, Gerhardt; Guhathakurta, Puragra; Sharon, Keren; Hurley, Mairead; Frye, Brenda L.; Bowen, David V. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2012-01-01 |
| 言語 | eng |
| 内容記述 | We take advantage of gravitational lensing amplification by Abell 1689 (z=0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux of i(sub 775)=27.3 via slitless grism spectroscopy. One ELG (at z=0.7895) is very bright owing to lensing magnification by a factor of approx = 4.5. Several Balmer emission lines detected from ground-based follow-up spectroscopy signal the onset of a major starburst for this low-mass galaxy (M(sub star) approx = 2 x 10(exp 9)Solar Mass) with a high specific star formation rate (approx = 20/ Gyr). From the blue emission lines we measure a gas-phase oxygen abundance consistent with solar (12+log(O /H)=8.8 +/- O.2). We break the continuous line-emitting region of this giant arc into seven approx 1 kpc bins (intrinsic size) and measure a variety of metallicity dependent line ratios. A weak trend of increasing metal fraction is seen toward the dynamical center of the galaxy. Interestingly, the metal line ratios in a region offset from the center by -lkpc have a placement on the blue HI! region excitation diagram with f([OIII]/ f(H-Beta) and f([NeIII/ f(H-Beta) that can be fit by an AGN. This asymmetrical AGN-like behavior is interpreted as a product of shocks in the direction of the galaxy's extended tail, possibly instigated by a recent galaxy interaction. |
| NASA分類 | Astrophysics |
| レポートNO | GSFC.JA.6857.2012 |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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