論文

査読有り
2015年6月

REST-FRAME OPTICAL EMISSION LINES IN FAR-INFRARED-SELECTED GALAXIES AT z < 1.7 FROM THE FMOS-COSMOS SURVEY

ASTROPHYSICAL JOURNAL LETTERS
  • Jeyhan S. Kartaltepe
  • D. B. Sanders
  • J. D. Silverman
  • D. Kashino
  • J. Chu
  • H. Zahid
  • G. Hasinger
  • L. Kewley
  • K. Matsuoka
  • T. Nagao
  • L. Riguccini
  • M. Salvato
  • K. Schawinski
  • Y. Taniguchi
  • E. Treister
  • P. Capak
  • E. Daddi
  • K. Ohta
  • 全て表示

806
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/2041-8205/806/2/L35
出版者・発行元
IOP PUBLISHING LTD

We have used FMOS on Subaru to obtain near-infrared spectroscopy of 123 far-infrared-selected galaxies in COSMOS and the key rest-frame optical emission lines. This is the largest sample of infrared galaxies with near-infrared spectroscopy at these redshifts. The far-infrared selection results in a sample of galaxies that are massive systems that span a range of metallicities in comparison with previous optically selected surveys, and thus has a higher active galactic nucleus (AGN) fraction and better samples the AGN branch. We establish the presence of AGNs and starbursts in this sample of (U)LIRGs selected as Herschel-PACS and Spitzer-MIPS detections in two redshift bins (z similar to 0.7 and z similar to 1.5) and test the redshift dependence of diagnostics used to separate AGNs from star formation dominated galaxies. In addition, we construct a low-redshift (z similar to 0.1) comparison sample of infrared-selected galaxies and find that the evolution from z similar to 1.5 to today is consistent with an evolving AGN selection line and a range of ISM conditions and metallicities from the models of Kewley et al. We find that a large fraction of (U)LIRGs are BPT-selected AGNs using their new redshift-dependent classification line. We compare the position of known X-ray-detected AGNs (67 in total) with the BPT selection and find that the new classification line accurately selects most of these objects (>70%). Furthermore, we identify 35 new (likely obscured) AGNs not selected as such by their X-ray emission. Our results have direct implications for AGN selection at higher redshift with either current (MOSFIRE, KMOS) or future (PFS, MOONS) spectroscopic efforts with near-infrared spectral coverage.

リンク情報
DOI
https://doi.org/10.1088/2041-8205/806/2/L35
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000356772700014&DestApp=WOS_CPL
ID情報
  • DOI : 10.1088/2041-8205/806/2/L35
  • ISSN : 2041-8205
  • eISSN : 2041-8213
  • Web of Science ID : WOS:000356772700014

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