ALMA/SCUBA-2 COSMOS Survey: Properties of X-ray- and SED-selected AGNs in Bright Submillimeter Galaxies
| Autor: | Uematsu, Ryosuke, Ueda, Yoshihiro, Alexander, David M., Swinbank, A. M., Smail, Ian, Andonie, Carolina, Chen, Chian-Chou, Dudzeviciute, Ugne, Ikarashi, Soh, Kohno, Kotaro, Matsuda, Yuichi, Puglisi, Annagrazia, Umehata, Hideki, Wang, Wei-Hao |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | 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 ALMA/SCUBA-2 COSMOS Survey (AS2COSMOS), which consists of 260 SMGs with $S_{\mathrm{870}\, \mu \mathrm{m}}=0.7\text{--}19.2\,\mathrm{mJy}$ at $z=0\text{--}6$. 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 $25^{+6}_{-5}$\% of the SMGs without AGNs as major merger candidates. This fraction is almost consistent with the general galaxy population at $z\sim2$, suggesting that major mergers are not necessarily required for the enhanced star formation in SMGs. We also identify $47^{+16}_{-15}$\% 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. Comment: 37 pages, 21 figures, accepted for The Astrophysical Journal |
| Databáze: | arXiv |
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