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  • Noboriguchi, AkatokiEhime University,Tohoku University (author)

Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022-12-23
  • American Astronomical Society,2022
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:ffca4e75-2c2d-4288-b358-6143709ed50a
  • https://research.chalmers.se/publication/534120URI
  • https://doi.org/10.3847/1538-4357/aca403DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We report optical spectroscopic observations of four blue-excess dust-obscured galaxies (BluDOGs) identified by the Subaru Hyper Suprime-Cam. BluDOGs are a subclass of dust-obscured galaxies (DOGs; defined with the extremely red color (i − [22])AB ≥ 7.0; Toba et al., showing a significant flux excess in the optical g and r bands over the power-law fits to the fluxes at the longer wavelengths. Noboriguchi et al. have suggested that BluDOGs may correspond to the blowing-out phase involved in a gas-rich major-merger scenario. However, the detailed properties of BluDOGs are not understood because of the lack of spectroscopic information. In this work, we carry out deep optical spectroscopic observations of four BluDOGs using Subaru/FOCAS and VLT/FORS2. The obtained spectra show broad emission lines with extremely large equivalent widths, and a blue wing in the C iv line profile. The redshifts are between 2.2 and 3.3. The averaged rest-frame equivalent widths of the C iv lines are 160 ± 33 Å, ∼7 times higher than the average of a typical type 1 quasar. The FWHMs of their velocity profiles are between 1990 and 4470 km s−1, and their asymmetric parameters are 0.05 and 0.25. Such strong C iv lines significantly affect the broadband magnitudes, which are partly the origin of the blue excess seen in the spectral energy distribution of BluDOGs. Their estimated supermassive black hole masses are 1.1 × 108 < M BH/M ⊙ <5.5 × 108. The inferred Eddington ratios of the BluDOGs are higher than 1 (1.1 < λ Edd < 3.8), suggesting that the BluDOGs are in a rapidly evolving phase of supermassive black holes.

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  • Nagao, TohruEhime University (author)
  • Toba, Y.Academia Sinica Taiwan,Kyoto University,Ehime University,National Astronomical Observatory of Japan (author)
  • Ichikawa, KoheiTohoku University (author)
  • Kajisawa, MasaruEhime University (author)
  • Kato, NanakoEhime University (author)
  • Kawaguchi, Toshihiro (author)
  • Matsuhara, HideoThe Graduate University for Advanced Studies (SOKENDAI) (author)
  • Matsuoka, YoshikiEhime University (author)
  • Onishi, Kyoko,1989Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kyokoo (author)
  • Onoue, MasafusaUniversity of Tokyo, Japan,Beijing University of Technology,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Tamada, NozomuEhime University (author)
  • Terao, KokiNational Astronomical Observatory of Japan,Tohoku University (author)
  • Terashima, YuichiEhime University (author)
  • Ueda, YoshihiroKyoto University (author)
  • Yamashita, TakujiNational Astronomical Observatory of Japan,Ehime University (author)
  • Ehime UniversityTohoku University (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: American Astronomical Society941:21538-43570004-637X

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