The Subaru-XMM-Newton Deep Survey (SXDS). VIII. Multi-wavelength identification, optical/NIR spectroscopic properties, and photometric redshifts of X-ray sources

Masayuki Akiyama*, Yoshihiro Ueda, Mike G. Watson, Hisanori Furusawa, Tadafumi Takata, Chris Simpson, Tomoki Morokuma, Toru Yamada, Kouji Ohta, Fumihide Iwamuro, Kiyoto Yabe, Naoyuki Tamura, Yuuki Moritani, Naruhisa Takato, Masahiko Kimura, Toshinori Maihara, Gavin Dalton, Ian Lewis, Hanshin Lee, Emma Curtis-LakeEdward Macaulay, Frazer Clarke, John D. Silverman, Scott Croom, Masami Ouchi, Hitoshi Hanami, Jorge Diaz Tello, Tomohiro Yoshikawa, Naofumi Fujishiro, Kazuhiro Sekiguchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We report on the multi-wavelength identification of the X-ray sources found in the Subaru-XMM-Newton Deep Survey (SXDS) using deep imaging data covering the wavelength range between the far-UV and mid-IR (MIR). We select a primary counterpart of each X-ray source by applying the likelihood ratio method to R-band, 3.6 mu m, near-UV, and 24 mu m source catalogs as well as matching catalogs of active galactic nucleus (AGN) candidates selected in 1.4 GHz radio and i'-band variability surveys. Once candidates for Galactic stars, ultra-luminous X-ray sources in a nearby galaxy, and clusters of galaxies are removed there are 896 AGN candidates in the sample. We conduct spectroscopic observations of the primary counterparts with multi-object spectrographs in the optical and NIR; 65% of the X-ray AGN candidates are spectroscopically identified. For the remaining X-ray AGN candidates, we evaluate their photometric redshift with photometric data in 15 bands. Utilizing the multi-wavelength photometric data of the large sample of X-ray-selected AGNs, we evaluate the stellar masses, M-*, of the host galaxies of the narrow-line AGNs. The distribution of the stellarmass is remarkably constant from z=0.1 to 4.0. The relation between M-* and 2-10 keV luminosity can be explained with strong cosmological evolution of the relationship between the black hole mass and M-*. We also evaluate the scatter of the UV-MIR spectral energy distribution (SED) of the X-ray AGNs as a function of X-ray luminosity and absorption by the nucleus. The scatter is compared with galaxies which have redshift and stellarmass distributionmatched with the X-ray AGN. The UV-NIR (near-IR) SEDs of obscured X-ray AGNs are similar to those of the galaxies in the matched sample. In the NIR-MIR range, the median SEDs of X-ray AGNs are redder, but the scatter of the SEDs of the X-ray AGN broadly overlaps that of the galaxies in the matched sample.

Original languageEnglish
Article number82
Number of pages38
JournalPublications of Astronomical Society of Japan
Volume67
Issue number5
Early online date2 Jul 2015
DOIs
Publication statusPublished - Oct 2015

Keywords / Materials (for Non-textual outputs)

  • catalogs
  • galaxies: active
  • quasars: general
  • surveys
  • X-rays: galaxies
  • ACTIVE GALACTIC NUCLEI
  • SUPERMASSIVE BLACK-HOLES
  • STAR-FORMING GALAXIES
  • SPECTRAL ENERGY-DISTRIBUTIONS
  • BULGE MASS RELATION
  • DIGITAL SKY SURVEY
  • WIDE-FIELD SURVEY
  • SIMILAR-TO 1
  • LUMINOSITY FUNCTION
  • HOST GALAXIES

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