Sökning: WFRF:(Ichikawa Kohei) > (2022) > Extreme Nature of F...
Fältnamn | Indikatorer | Metadata |
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000 | 04690naa a2200529 4500 | |
001 | oai:research.chalmers.se:ffca4e75-2c2d-4288-b358-6143709ed50a | |
003 | SwePub | |
008 | 230112s2022 | |||||||||||000 ||eng| | |
024 | 7 | a https://research.chalmers.se/publication/5341202 URI |
024 | 7 | a https://doi.org/10.3847/1538-4357/aca4032 DOI |
040 | a (SwePub)cth | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a art2 swepub-publicationtype |
072 | 7 | a ref2 swepub-contenttype |
100 | 1 | a Noboriguchi, Akatokiu Ehime University,Tohoku University4 aut |
245 | 1 0 | a Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy |
264 | c 2022-12-23 | |
264 | 1 | b American Astronomical Society,c 2022 |
338 | a electronic2 rdacarrier | |
520 | a 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. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
650 | 7 | a NATURVETENSKAPx Fysikx Atom- och molekylfysik och optik0 (SwePub)103022 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Atom and Molecular Physics and Optics0 (SwePub)103022 hsv//eng |
650 | 7 | a NATURVETENSKAPx Fysikx Den kondenserade materiens fysik0 (SwePub)103042 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Condensed Matter Physics0 (SwePub)103042 hsv//eng |
700 | 1 | a Nagao, Tohruu Ehime University4 aut |
700 | 1 | a Toba, Y.u Academia Sinica Taiwan,Kyoto University,Ehime University,National Astronomical Observatory of Japan4 aut |
700 | 1 | a Ichikawa, Koheiu Tohoku University4 aut |
700 | 1 | a Kajisawa, Masaruu Ehime University4 aut |
700 | 1 | a Kato, Nanakou Ehime University4 aut |
700 | 1 | a Kawaguchi, Toshihiro4 aut |
700 | 1 | a Matsuhara, Hideou The Graduate University for Advanced Studies (SOKENDAI)4 aut |
700 | 1 | a Matsuoka, Yoshikiu Ehime University4 aut |
700 | 1 | a Onishi, Kyoko,d 1989u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)kyokoo |
700 | 1 | a Onoue, Masafusau University 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)4 aut |
700 | 1 | a Tamada, Nozomuu Ehime University4 aut |
700 | 1 | a Terao, Kokiu National Astronomical Observatory of Japan,Tohoku University4 aut |
700 | 1 | a Terashima, Yuichiu Ehime University4 aut |
700 | 1 | a Ueda, Yoshihirou Kyoto University4 aut |
700 | 1 | a Yamashita, Takujiu National Astronomical Observatory of Japan,Ehime University4 aut |
710 | 2 | a Ehime Universityb Tohoku University4 org |
773 | 0 | t Astrophysical Journald : American Astronomical Societyg 941:2q 941:2x 1538-4357x 0004-637X |
856 | 4 | u https://research.chalmers.se/publication/534120/file/534120_Fulltext.pdfx primaryx freey FULLTEXT |
856 | 4 8 | u https://research.chalmers.se/publication/534120 |
856 | 4 8 | u https://doi.org/10.3847/1538-4357/aca403 |
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