ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies
We investigate the properties of active galactic nuclei (AGNs) in the brightest submillimeter galaxies (SMGs) in the COSMOS field. We utilize the bright sample of the ALMA/SCUBA-2 COSMOS Survey (AS2COSMOS), which consists of 260 SMGs with S _870 _μ _m = 0.7–19.2 mJy at z = 0–6. We perform optical...
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2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9f3b |
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| author | Ryosuke Uematsu Yoshihiro Ueda David M. Alexander A. M. Swinbank Ian Smail Carolina Andonie Chian-Chou Chen Ugne Dudzevičiūtė Soh Ikarashi Kotaro Kohno Yuichi Matsuda Annagrazia Puglisi Hideki Umehata Wei-Hao Wang |
| author_facet | Ryosuke Uematsu Yoshihiro Ueda David M. Alexander A. M. Swinbank Ian Smail Carolina Andonie Chian-Chou Chen Ugne Dudzevičiūtė Soh Ikarashi Kotaro Kohno Yuichi Matsuda Annagrazia Puglisi Hideki Umehata Wei-Hao Wang |
| author_sort | Ryosuke Uematsu |
| collection | DOAJ |
| description | We investigate the properties of active galactic nuclei (AGNs) in the brightest submillimeter galaxies (SMGs) in the COSMOS field. We utilize the bright sample of the ALMA/SCUBA-2 COSMOS Survey (AS2COSMOS), which consists of 260 SMGs with S _870 _μ _m = 0.7–19.2 mJy at z = 0–6. We perform optical to millimeter spectral energy distribution (SED) modeling for the whole sample. We identify 24 AGN-host galaxies from the SEDs. Supplemented by 23 X-ray-detected AGNs (X-ray AGNs), we construct an overall sample of 40 AGN-host galaxies. The X-ray luminosity upper bounds indicate that the X-ray-undetected SED-identified AGNs are likely to be nearly Compton thick or have unusually suppressed X-ray emission. From visual classification, we identify $2{5}_{-5}^{+6}$ % of the SMGs without AGNs as major merger candidates. This fraction is almost consistent with the general galaxy population at z ∼ 2, suggesting that major mergers are not necessarily required for the enhanced star formation in SMGs. We also identify $4{7}_{-15}^{+16}$ % of the AGN hosts as major merger candidates, which is about twice as high as that in the SMGs without AGNs. This suggests that major mergers play a key role in triggering AGN activity in bright SMGs. |
| format | Article |
| id | doaj-art-ce11d38ca136445a82f37746eaec324f |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-ce11d38ca136445a82f37746eaec324f2025-01-24T09:12:07ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01979216810.3847/1538-4357/ad9f3bALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter GalaxiesRyosuke Uematsu0https://orcid.org/0000-0001-6653-779XYoshihiro Ueda1https://orcid.org/0000-0001-7821-6715David M. Alexander2https://orcid.org/0000-0002-5896-6313A. M. Swinbank3https://orcid.org/0000-0003-1192-5837Ian Smail4https://orcid.org/0000-0003-3037-257XCarolina Andonie5https://orcid.org/0000-0002-5580-4298Chian-Chou Chen6https://orcid.org/0000-0002-3805-0789Ugne Dudzevičiūtė7https://orcid.org/0000-0003-4748-0681Soh Ikarashi8Kotaro Kohno9https://orcid.org/0000-0002-4052-2394Yuichi Matsuda10https://orcid.org/0000-0003-1747-2891Annagrazia Puglisi11https://orcid.org/0000-0001-9369-1805Hideki Umehata12https://orcid.org/0000-0003-1937-0573Wei-Hao Wang13https://orcid.org/0000-0003-2588-1265Department of Astronomy, Kyoto University , Sakyo-ku, Kyoto, JapanDepartment of Astronomy, Kyoto University , Sakyo-ku, Kyoto, JapanCentre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UKCentre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UKCentre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UKCentre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UKAcademia Sinica Institute of Astronomy and Astrophysics (ASIAA) , No. 1, Sec. 4, Roosevelt Road, Taipei 106216, TaiwanMax-Planck-Institut für Astronomie , K’onigstuhl 17, D-69117, Heidelberg, GermanyNational Astronomical Observatory of Japan , Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan; Junior College , Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka, 811-0295, Japan; Department of Physics, General Studies, College of Engineering, Nihon University , 1 Nakagawara, Tokusada, Tamuramachi, Koriyama, Fukushima, 963-8642, JapanInstitute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan; Research Center for the Early Universe, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanNational Astronomical Observatory of Japan , Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan; Graduate University for Advanced Studies (SOKENDAI) , Osawa 2-21-1, Mitaka, Tokyo 181-8588, JapanCentre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UK; School of Physics and Astronomy, University of Southampton , Highfield SO17 1BJ, UKInstitute for Advanced Research, Nagoya University , Furocho, Chikusa, Nagoya 464-8602, Japan; Department of Physics, Graduate School of Science, Nagoya University , Furocho, Chikusa, Nagoya 464-8602, JapanInstitute of Astronomy and Astrophysics , Academia Sinica, Taipei 10617, TaiwanWe investigate the properties of active galactic nuclei (AGNs) in the brightest submillimeter galaxies (SMGs) in the COSMOS field. We utilize the bright sample of the ALMA/SCUBA-2 COSMOS Survey (AS2COSMOS), which consists of 260 SMGs with S _870 _μ _m = 0.7–19.2 mJy at z = 0–6. We perform optical to millimeter spectral energy distribution (SED) modeling for the whole sample. We identify 24 AGN-host galaxies from the SEDs. Supplemented by 23 X-ray-detected AGNs (X-ray AGNs), we construct an overall sample of 40 AGN-host galaxies. The X-ray luminosity upper bounds indicate that the X-ray-undetected SED-identified AGNs are likely to be nearly Compton thick or have unusually suppressed X-ray emission. From visual classification, we identify $2{5}_{-5}^{+6}$ % of the SMGs without AGNs as major merger candidates. This fraction is almost consistent with the general galaxy population at z ∼ 2, suggesting that major mergers are not necessarily required for the enhanced star formation in SMGs. We also identify $4{7}_{-15}^{+16}$ % of the AGN hosts as major merger candidates, which is about twice as high as that in the SMGs without AGNs. This suggests that major mergers play a key role in triggering AGN activity in bright SMGs.https://doi.org/10.3847/1538-4357/ad9f3bActive galaxiesHigh-redshift galaxiesSubmillimeter astronomyX-ray active galactic nuclei |
| spellingShingle | Ryosuke Uematsu Yoshihiro Ueda David M. Alexander A. M. Swinbank Ian Smail Carolina Andonie Chian-Chou Chen Ugne Dudzevičiūtė Soh Ikarashi Kotaro Kohno Yuichi Matsuda Annagrazia Puglisi Hideki Umehata Wei-Hao Wang ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies The Astrophysical Journal Active galaxies High-redshift galaxies Submillimeter astronomy X-ray active galactic nuclei |
| title | ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies |
| title_full | ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies |
| title_fullStr | ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies |
| title_full_unstemmed | ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies |
| title_short | ALMA/SCUBA-2 COSMOS Survey: Properties of X-Ray- and SED-selected Active Galactic Nuclei in Bright Submillimeter Galaxies |
| title_sort | alma scuba 2 cosmos survey properties of x ray and sed selected active galactic nuclei in bright submillimeter galaxies |
| topic | Active galaxies High-redshift galaxies Submillimeter astronomy X-ray active galactic nuclei |
| url | https://doi.org/10.3847/1538-4357/ad9f3b |
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