Spectral energy distributions of type 1 AGN in XMM-COSMOS - II. Shape evolution

Heng Hao, Martin Elvis, Francesca Civano, Gianni Zamorani, Luis C. Ho, Andrea Comastri, Marcella Brusa, Angela Bongiorno, Andrea Merloni, Jonathan R. Trump, Mara Salvato, Chris D. Impey, Anton M. Koekemoer, Giorgio Lanzuisi, Annalisa Celotti, Knud Jahnke, Cristian Vignali, John D. Silverman, C. Megan Urry, Kevin SchawinskiPeter Capak

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The mid-infrared-to-ultraviolet (0.1-10 μm) spectral energy distribution (SED) shapes of 407 X-ray-selected radio-quiet type 1 active galactic nuclei (AGN) in the wide-field 'Cosmic Evolution Survey' (COSMOS) have been studied for signs of evolution. For a sub-sample of 200 radio-quiet quasars with black hole mass estimates and host galaxy corrections, we studied their mean SEDs as a function of a broad range of redshift, bolometric luminosity, black hole mass and Eddington ratio, and compared them with the Elvis et al. (E94) type 1 AGN mean SED. We found that the mean SEDs in each bin are closely similar to each other, showing no statistical significant evidence of dependence on any of the analysed parameters. We also measured the SED dispersion as a function of these four parameters, and found no significant dependences. The dispersion of the XMM-COSMOS SEDs is generally larger than E94 SED dispersion in the ultraviolet, which might be due to the broader 'window function' for COSMOS quasars, and their X-ray-based selection.

Original languageEnglish (US)
Article numberstt2274
Pages (from-to)1288-1304
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue number2
DOIs
StatePublished - Mar 2014

Keywords

  • Galaxies: evolution
  • Quasars: general
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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