ALMA Lensing Cluster Survey: Properties of Millimeter Galaxies Hosting X-Ray-detected Active Galactic Nuclei
Fujimoto, Seiji; Kohno, Kotaro; Sun, Fengwu; Ueda, Yoshihiro; Magdis, Georgios E.; Hatsukade, Bunyo; Toba, Yoshiki; Kokorev, Vasily; Espada, Daniel; Ao, Yiping; Umehata, Hideki; Yamada, Satoshi; Uematsu, Ryosuke
Japan, Taiwan, Denmark, Spain, United States, Netherlands, China
Abstract
We report the multiwavelength properties of millimeter galaxies hosting X-ray detected active galactic nuclei (AGNs) from the ALMA Lensing Cluster Survey (ALCS). ALCS is an extensive survey of well-studied lensing clusters with ALMA, covering an area of 133 arcmin2 over 33 clusters with a 1.2 mm flux-density limit of ~60 μJy (1σ). Utilizing the archival data of Chandra, we identify three AGNs at z = 1.06, 2.09, and 2.84 among the 180 millimeter sources securely detected in the ALCS (of which 155 are inside the coverage of Chandra). The X-ray spectral analysis shows that two AGNs are not significantly absorbed ( $\mathrm{log}{N}_{{\rm{H}}}/{\mathrm{cm}}^{-2}\lt 23$ ), while the other shows signs of moderate absorption ( $\mathrm{log}{N}_{{\rm{H}}}/{\mathrm{cm}}^{-2}\sim 23.5$ ). We also perform spectral energy distribution modeling of X-ray to millimeter photometry. We find that our X-ray AGN sample shows both high mass-accretion rates (intrinsic 0.5-8 keV X-ray luminosities of ~1044-45 erg s-1) and star formation rates (≳100 M ⊙ yr-1). This demonstrates that a wide-area survey with ALMA and Chandra can selectively detect intense growth of both galaxies and supermassive black holes in the high-redshift universe.