H. Umehata
ALMA Deep Field in SSA22: Source Catalog and Number Counts
Umehata, H.; Tamura, Y.; Kohno, K.; Ivison, R.J.; Smail, I.; Hatsukade, B.; Nakanishi, K.; Kato, Y.; Ikarashi, S.; Matsuda, Y.; Fujimoto, S.; Iono, D.; Lee, M.; Steidel, C.C.; Saito, T.; Alexander, D.M.; Yun, M.S.; Kubo, M.
Authors
Y. Tamura
K. Kohno
R.J. Ivison
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
B. Hatsukade
K. Nakanishi
Y. Kato
S. Ikarashi
Y. Matsuda
S. Fujimoto
D. Iono
M. Lee
C.C. Steidel
T. Saito
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
M.S. Yun
M. Kubo
Abstract
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 0farcs7. 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 $0\buildrel{\prime\prime}\over{.} {32}_{-0.06}^{+0.13}$ (${2.4}_{-0.4}^{+1.0}$ 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 S1.1mm ≥ 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.
Citation
Umehata, H., Tamura, Y., Kohno, K., Ivison, R., Smail, I., Hatsukade, B., …Kubo, M. (2017). ALMA Deep Field in SSA22: Source Catalog and Number Counts. Astrophysical Journal, 835(1), Article 98. https://doi.org/10.3847/1538-4357/835/1/98
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 28, 2016 |
Online Publication Date | Jan 20, 2017 |
Publication Date | Jan 20, 2017 |
Deposit Date | Feb 22, 2017 |
Publicly Available Date | Mar 29, 2024 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 835 |
Issue | 1 |
Article Number | 98 |
DOI | https://doi.org/10.3847/1538-4357/835/1/98 |
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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.
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