SIMBAD references

2011ApJ...743..144T - Astrophys. J., 743, 144 (2011/December-3)

A CANDELS WFC3 grism study of emission-line galaxies at z ∼ 2: a mix of nuclear activity and low-metallicity star formation.

TRUMP J.R., WEINER B.J., SCARLATA C., KOCEVSKI D.D., BELL E.F., McGRATH E.J., KOO D.C., FABER S.M., LAIRD E.S., MOZENA M., RANGEL C., YAN R., YESUF H., ATEK H., DICKINSON M., DONLEY J.L., DUNLOP J.S., FERGUSON H.C., FINKELSTEIN S.L., GROGIN N.A., HATHI N.P., JUNEAU S., KARTALTEPE J.S., KOEKEMOER A.M., NANDRA K., NEWMAN J.A., RODNEY S.A., STRAUGHN A.N. and TEPLITZ H.I.

Abstract (from CDS):

We present Hubble Space Telescope Wide Field Camera 3 (WFC3) slitless grism spectroscopy of 28 emission-line galaxies at z ∼ 2, in the GOODS-S region of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. The high sensitivity of these grism observations, with >1σ detections of emission lines to f > 2.5x10–18 erg/s/cm2, means that the galaxies in the sample are typically ∼7 times less massive (median M*= 109.5 M) than previously studied z ∼ 2 emission-line galaxies. Despite their lower mass, the galaxies have [O III]/Hβ ratios which are very similar to previously studied z ∼ 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 Hβ emission line with 98.1% confidence. We additionally stack the X-ray data (all sources are individually undetected), and find that the average L_[O III]/L0.5-10 keV_ ratio is intermediate between typical z ∼ 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.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: active - galaxies: evolution - quasars: emission lines

Nomenclature: Table 1: [TWS2011] NN (Nos 1-28).

Simbad objects: 30

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2022.08.07-23:39:38

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