TY - JOUR
T1 - Submillimeter Array identification of the millimeter-selected galaxy SSA22-AzTEC1
T2 - A protoquasar in a protocluster?
AU - Tamura, Y.
AU - Iono, D.
AU - Wilner, D. J.
AU - Kajisawa, M.
AU - Uchimoto, Y. K.
AU - Alexander, D. M.
AU - Chung, A.
AU - Ezawa, H.
AU - Hatsukade, B.
AU - Hayashino, T.
AU - Hughes, D. H.
AU - Ichikawa, T.
AU - Ikarashi, S.
AU - Kawabe, R.
AU - Kohno, K.
AU - Lehmer, B. D.
AU - Matsuda, Y.
AU - Nakanishi, K.
AU - Takata, T.
AU - Wilson, G. W.
AU - Yamada, T.
AU - Yun, M. S.
PY - 2010/12/1
Y1 - 2010/12/1
N2 - We present results from Submillimeter Array (SMA) 860 μm subarcsecond astrometry and multiwavelength observations of the brightest millimeter (S 1.1mm = 8.4 mJy) source, SSA22-AzTEC1, found near the core of the SSA22 protocluster that is traced by Lyα-emitting galaxies at z = 3.09. We identify a 860 μm counterpart with a flux density of S860 μm = 12.2 ± 2.3 mJy and absolute positional accuracy that is better than 0′′.3. At the SMA position, we find radio-to-mid-infrared counterparts, whilst no object is found in Subaru optical and near-infrared deep images at wavelengths ≤1μm (J > 25.4 in AB, 2δ). The photometric redshift estimate, using flux densities at ≥24 μm, indicates z phot = 3.19+0.26-0.35, consistent with the protocluster redshift. We then model the near-to-mid-infrared spectral energy distribution (SED) of SSA22-AzTEC1, and find that the SED modeling requires a large extinction (AV ≈ 3.4 mag) of starlight from a stellar component with Mstar ∼ 1010.9M⊙, assuming z = 3.1. Additionally, we find a significant X-ray counterpart with a very hard spectrum (Γeff =0.34+0.57 -0.61), strongly suggesting that SSA22-AzTEC1 harbors a luminous active galactic nuclei (AGNs; LX ≈ 3 × 1044 erg s-1) behind a large hydrogen column (NH ∼ 10 24 cm-2). The AGN, however, is responsible for only ∼10% of the bolometric luminosity of the host galaxy, and therefore the star formation activity likely dominates the submillimeter emission. It is possible that SSA22-AzTEC1 is the first example of a protoquasar growing at the bottom of the gravitational potential underlying the SSA22 protocluster.
AB - We present results from Submillimeter Array (SMA) 860 μm subarcsecond astrometry and multiwavelength observations of the brightest millimeter (S 1.1mm = 8.4 mJy) source, SSA22-AzTEC1, found near the core of the SSA22 protocluster that is traced by Lyα-emitting galaxies at z = 3.09. We identify a 860 μm counterpart with a flux density of S860 μm = 12.2 ± 2.3 mJy and absolute positional accuracy that is better than 0′′.3. At the SMA position, we find radio-to-mid-infrared counterparts, whilst no object is found in Subaru optical and near-infrared deep images at wavelengths ≤1μm (J > 25.4 in AB, 2δ). The photometric redshift estimate, using flux densities at ≥24 μm, indicates z phot = 3.19+0.26-0.35, consistent with the protocluster redshift. We then model the near-to-mid-infrared spectral energy distribution (SED) of SSA22-AzTEC1, and find that the SED modeling requires a large extinction (AV ≈ 3.4 mag) of starlight from a stellar component with Mstar ∼ 1010.9M⊙, assuming z = 3.1. Additionally, we find a significant X-ray counterpart with a very hard spectrum (Γeff =0.34+0.57 -0.61), strongly suggesting that SSA22-AzTEC1 harbors a luminous active galactic nuclei (AGNs; LX ≈ 3 × 1044 erg s-1) behind a large hydrogen column (NH ∼ 10 24 cm-2). The AGN, however, is responsible for only ∼10% of the bolometric luminosity of the host galaxy, and therefore the star formation activity likely dominates the submillimeter emission. It is possible that SSA22-AzTEC1 is the first example of a protoquasar growing at the bottom of the gravitational potential underlying the SSA22 protocluster.
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U2 - 10.1088/0004-637X/724/2/1270
DO - 10.1088/0004-637X/724/2/1270
M3 - Article
AN - SCOPUS:78650086410
SN - 0004-637X
VL - 724
SP - 1270
EP - 1282
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -