4.7 Article

THE MOSDEF SURVEY: OPTICAL ACTIVE GALACTIC NUCLEUS DIAGNOSTICS AT z ∼ 2.3

期刊

ASTROPHYSICAL JOURNAL
卷 801, 期 1, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/801/1/35

关键词

galaxies: active; galaxies: evolution; galaxies: high-redshift; galaxies: Seyfert

资金

  1. NASA [NAS 5-26555]
  2. NSF AAG [AST-1312780, 1312547, 1312764, 1313171]
  3. Space Telescope Science Institute [AR-13907]
  4. NSF CAREER award [AST-1055081]
  5. Alfred P. Sloan Research Fellowship
  6. W. M. Keck Foundation
  7. Direct For Mathematical & Physical Scien
  8. Division Of Astronomical Sciences [1312764, 1313171, 1312780, 1055081] Funding Source: National Science Foundation
  9. Direct For Mathematical & Physical Scien
  10. Division Of Astronomical Sciences [1312547] Funding Source: National Science Foundation

向作者/读者索取更多资源

We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on rest-frame optical active galactic nucleus (AGN) identification and completeness at z similar to 2.3. With our sample of 50 galaxies and 10 X-ray and IR-selected AGNs with measured H beta, [O III], H alpha, and N II emission lines, we investigate the location of AGNs in the BPT, MEx (mass-excitation), and CEx (color-excitation) diagrams. We find that th BPT diagram works well to identify AGNs at z similar to 2.3 and that the z similar to 0 AGN/star-forming galaxy classifications do not need to shift substantially at z similar to 2.3 to robustly separate these populations. However, the MEx diagram fails to identify all of the AGN identified in the BPT diagram, and the CEx diagram is substantially contaminated at high redshift. We further show that AGN samples selected using the BPT diagram have selection biases in terms of both host stellar mass and stellar population, in that AGNs in low mass and/or high specific star formation rate galaxies are difficult to identify using the BPT diagram. These selection biases become increasingly severe at high redshift, such that optically selected AGN samples at high redshift will necessarily be incomplete. We also find that the gas in the narrow-line region appears to be more enriched than gas in the host galaxy for at least some MOSDEF AGNs. However, AGNs at z similar to 2 are generally less enriched than local AGNs with the same host stellar mass.

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