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Ikarashi, Soh; Caputi, Karina I; Ohta, Kouji; Ivison, R. J.; Lagos, Claudia D. P; Bisigello, Laura; Hatsukade, Bunyo; Aretxaga, Itziar; Dunlop, James S; Hughes, David H; Iono, Daisuke; Izumi, Takuma; Kashikawa, Nobunari; Koyama, Yusei; Kawabe, Ryohei; Kohno, Kotaro; Motohara, Kentaro; Nakanishi, Kouichiro; Tamura, Yoichi; Umehata, Hideki; Wilson, Grant W; Yabe, Kiyoto; Yun, Min S
Astrophysical journal. Letters, 11/2017, Volume: 849, Issue: 2Journal Article
We report the study of the far-infrared (IR) sizes of submillimeter galaxies (SMGs) in relation to their dust-obscured star formation rate (SFR) and active galactic nuclei (AGN) presence, determined using mid-IR photometry. We determined the millimeter-wave ( m) sizes of 69 Atacama Large Millimeter/submillimeter Array (ALMA)-identified SMGs, selected with confidence on ALMA images ( -7.4 mJy). We found that all of the SMGs are located above an avoidance region in the size-flux plane, as expected by the Eddington limit for star formation. In order to understand what drives the different millimeter-wave sizes in SMGs, we investigated the relation between millimeter-wave size and AGN fraction for 25 of our SMGs at z = 1-3. We found that the SMGs for which the mid-IR emission is dominated by star formation or AGN have extended millimeter-sizes, with respective median and kpc. Instead, the SMGs for which the mid-IR emission corresponds to star-forming/AGN composites have more compact millimeter-wave sizes, with median kpc. The relation between millimeter-wave size and AGN fraction suggests that this size may be related to the evolutionary stage of the SMG. The very compact sizes for composite star-forming/AGN systems could be explained by supermassive black holes growing rapidly during the SMG coalescing, star-formation phase.
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