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ALMA Deep Field in SSA22: Source Catalog and Number Counts

Umehata, Hideki and Tamura, Yoichi and Kohno, Kotaro and Ivison, R. J. and Smail, Ian and Hatsukade, Bunyo and Nakanishi, Kouichiro and Kato, Yuta and Ikarashi, Soh and Matsuda, Yuichi and Fujimoto, Seiji and Iono, Daisuke and Lee, Minju and Steidel, Charles C. and Saito, Tomoki and Alexander, D. M. and Yun, Min S. and Kubo, Mariko (2017) ALMA Deep Field in SSA22: Source Catalog and Number Counts. Astrophysical Journal, 835 (1). Art. No. 98. ISSN 0004-637X. doi:10.3847/1538-4357/835/1/98.

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We present results from a deep 2' × 3' (comoving scale of 3.7 Mpc × 5.5 Mpc at z = 3) survey at 1.1 mm, taken with the Atacama Large Millimeter/submillimeter Array (ALMA) in the SSA22 field. We observe the core region of a z = 3.09 protocluster, achieving a typical rms sensitivity of 60 μJy beam^(−1) at a spatial resolution of 0"7. We detect 18 robust ALMA sources at a signal-to-noise ratio (S/N) > 5. Comparison between the ALMA map and a 1.1 mm map, taken with the AzTEC camera on the Atacama Submillimeter Telescope Experiment (ASTE), indicates that three submillimeter sources discovered by the AzTEC/ASTE survey are resolved into eight individual submillimeter galaxies (SMGs) by ALMA. At least 10 of our 18 ALMA SMGs have spectroscopic redshifts of z sime 3.09, placing them in the protocluster. This shows that a number of dusty starburst galaxies are forming simultaneously in the core of the protocluster. The nine brightest ALMA SMGs with S/N > 10 have a median intrinsic angular size of 0."32_(-0.06)^(+0.13)(2.4_(-0.4^(+1.0 physical kpc at z = 3.09), which is consistent with previous size measurements of SMGs in other fields. As expected, the source counts show a possible excess compared to the counts in the general fields at S_(1.1mm) ≥ 1.0 mJy, due to the protocluster. Our contiguous mm mapping highlights the importance of large-scale structures on the formation of dusty starburst galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Umehata, Hideki0000-0003-1937-0573
Tamura, Yoichi0000-0003-4807-8117
Kohno, Kotaro0000-0002-4052-2394
Ivison, R. J.0000-0001-5118-1313
Smail, Ian0000-0003-3037-257X
Hatsukade, Bunyo0000-0001-6469-8725
Nakanishi, Kouichiro0000-0002-6939-0372
Matsuda, Yuichi0000-0003-1747-2891
Fujimoto, Seiji0000-0001-7201-5066
Iono, Daisuke0000-0002-2364-0823
Steidel, Charles C.0000-0002-4834-7260
Alexander, D. M.0000-0002-5896-6313
Yun, Min S.0000-0001-7095-7543
Kubo, Mariko0000-0002-7598-5292
Additional Information:© 2017 American Astronomical Society. Received 2016 July 15. Accepted 2016 November 28. Published 2017 January 20. We deeply appreciate the anonymous referee for a significant number of valuable comments. We are thankful for Ken Mawatari for helping us to compile redshift catalogs of z = 3.09 LAEs and LBGs in the literature. H.U. is supported by the ALMA Japan Research Grant of NAOJ Chile Observatory, NAOJ-ALMA-0071, 0131, 140, and 0152. H.U. is also supported by JSPS Grant-in-Aid for Research Activity Start-up (16H06713). Y.T. is supported by JSPS KAKENHI No. 15H02073. R.J.I. acknowledges support from ERC in the form of the Advanced Investigator Programme, 321302, COSMICISM. I.R.S. and D.M.A. acknowledge support from STFC (ST/L00075X/1). I.R.S. acknowledges support from the ERC Advanced Investigator program DUSTYGAL 321334, and a Royal Society/Wolfson Merit Award. S.I. acknowledges the support of the Netherlands Organization for Scientific Research (NWO) through the Top Grant Project 614.001.403. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00162.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), along with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. Facility: ALMA - Atacama Large Millimeter Array.
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
National Astronomical Observatory of JapanNAOJ-ALMA-0071
National Astronomical Observatory of JapanNAOJ-ALMA-0131
National Astronomical Observatory of JapanNAOJ-ALMA-140
National Astronomical Observatory of JapanNAOJ-ALMA-152
Japan Society for the Promotion of Science (JSPS)16H06713
Japan Society for the Promotion of Science (JSPS)15H02073
European Research Council (ERC)321302
Science and Technology Facilities Council (STFC)ST/L00075X/1
European Research Council (ERC)DUSTYGAL 321334
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)614.001.403
Subject Keywords:catalogs; galaxies: high-redshift; galaxies: star formation; galaxies: starburst; galaxies: structure
Issue or Number:1
Record Number:CaltechAUTHORS:20170125-134707645
Persistent URL:
Official Citation:Hideki Umehata et al 2017 ApJ 835 98
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73725
Deposited On:25 Jan 2017 23:38
Last Modified:06 May 2022 22:54

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