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A candels wfc3 grism study of emission-line galaxies at z approximates 2: a mix of nuclear activity and low-metallicity star formation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kartaltepe, Jeyhan S. Bell, Eric F. Grogin, Norman A. Finkelstein, Steven L. Weiner, Benjamin J. Dunlop, James S. Juneau, Stephanie Ferguson, Henry C. Faber, S. M. Yan, Renbin Atek, Hakim Dickinson, Mark Mozena, Mark Koekemoer, Anton M. Kocevski, Dale D. Trump, Jonathan R. Koo, David C. Rangel, Cyprian Hathi, Nimish P. Laird, Elise S. Nandra, Kirpal Donley, Jennifer L. McGrath, Elizabeth J. Yesuf, Hassen Scarlata, Claudia |
| Copyright Year | 2011 |
| Description | We present Hubble Space Telescope Wide Field Camera 3 slitless grism spectroscopy of 28 emission-line galaxies at z approximates 2, in the GOODS-S region of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). The high sensitivity of these grism observations, with > 5-sigma detections of emission lines to f > 2.5 X 10(exp -18( erg/s/ square cm, means that the galaxies in the sample are typically approximately 7 times less massive (median M(star). = 10(exp 9.5)M(solar)) than previously studied z approximates 2 emission-line galaxies. Despite their lower mass, the galaxies have [O-III]/H-Beta ratios which are very similar to previously studied z approximates 2 galaxies and much higher than the typical emission-line ratios of local galaxies. The WFC3 grism allows for unique studies of spatial gradients in emission lines, and we stack the two-dimensional spectra of the galaxies for this purpose. In the stacked data the [O-III] emission line is more spatially concentrated than the H-Beta emission line with 98.1% confidence. We additionally stack the X-ray data (all sources are individually undetected), and find that the average L(sub [O-III])/L(sub 0.5.10keV) ratio is intermediate between typical z approximates 0 obscured active galaxies and star-forming galaxies. Together the compactness of the stacked [O-III] spatial profile and the stacked X-ray data suggest that at least some of these low-mass, low-metallicity galaxies harbor weak active galactic nuclei. |
| File Size | 352786 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120002004 |
| Archival Resource Key | ark:/13960/t3vt6n501 |
| Language | English |
| Publisher Date | 2011-08-30 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Quasars Spectroscopy Active Galactic Nuclei Star Formation Galaxies Stellar Mass H Beta Line Emission Spectra Metallicity Galactic Evolution Hubble Space Telescope X Ray Astrophysics Facility Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
