Spectroscopic study of the HST/ACS pears emission-line galaxies

Xia L.; Malhotra S.; Rhoads J.Pirzkal N.Zheng Z.Meurer G.Straughn A.Grogin N.Floyd D.

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Spectroscopic study of the HST/ACS pears emission-line galaxies

机译：Spectroscopic study of the HST/ACS pears emission-line galaxies

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We present spectroscopy of 76 emission-line galaxies (ELGs) in Chandra Deep Field South taken with the LDSS3 spectrograph on the Magellan Telescope. These galaxies are selected because they have emission lines with the Advanced Camera for Surveys (ACS) grism data in the Hubble Space Telescope Probing Evolution and Reionization Spectroscopically (PEARS) grism Survey. The ACS grism spectra cover the wavelength range 6000-9700 ? and most PEARS grism redshifts are based on a single emission line + photometric redshifts from broadband colors; the Magellan spectra cover a wavelength range from 4000 ? to 9000 ? and provide a check on redshifts derived from PEARS data.We find an accuracy of αz = 0.006 for the ACS grism redshifts with only one catastrophic outlier.We probe for active galactic nuclei (AGNs) in our sample via several different methods. In total, we find 7 AGNs and AGN candidates out of 76 galaxies. Two AGNs are identified from the X-ray full-band luminosity, LX-ray,FB > 10~(43) erg s~(-1), the line widths, and the power-law continuum spectra. Two unobscured faint AGN candidates are identified from the X-ray full-band luminosity LX_(-ray),FB ～ 10~(41) erg s~(-1), the hardness ratio and the column density, and the emission-line and X-ray derived SFRs. Two candidates are classified based on the line ratio of N iiλ6584/Hα versus Oiiiλ5007/Hβ(BPT diagram), which are between the empirical and theoretical demarcation curves, i.e., the transition region from star-forming galaxies to AGNs. One AGN candidate is identified from the high-ionization emission line He ii?4686. All rights reserved.

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《The Astronomical journal》 |2011年第2期|64-1-64-6|共6页
作者
Xia L.; Malhotra S.; Rhoads J.Pirzkal N.Zheng Z.Meurer G.Straughn A.Grogin N.Floyd D.;
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作者单位

Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, United States;

NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States;

Space Telescope Science Institute, Baltimore, MD 21218, United StatesSchool of Physics, University of Melbourne, VIC 3010, AustraliaSchool of Earth and Space Exploration, Arizona State University, AZ 85287, United States;

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正文语种英语
中图分类天文学;
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Galaxies: Star formation; Quasars: Emission lines; Techniques: Spectroscopic;

Spectroscopic study of the HST/ACS pears emission-line galaxies

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