H. Umehata
ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core
Umehata, H.; Tamura, Y.; Kohno, K.; Ivison, R.J.; Alexander, D.M.; Geach, J.E.; Hatsukade, B.; Hughes, D.H.; Ikarashi, S.; Kato, Y.; Izumi, T.; Kawabe, R.; Kubo, M.; Lee, M.; Lehmer, B.; Makiya, R.; Matsuda, Y.; Nakanishi, K.; Saito, T.; Smail, I.; Yamada, T.; Yamaguchi, Y.; Yun, M.
Authors
Y. Tamura
K. Kohno
R.J. Ivison
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
J.E. Geach
B. Hatsukade
D.H. Hughes
S. Ikarashi
Y. Kato
T. Izumi
R. Kawabe
M. Kubo
M. Lee
B. Lehmer
R. Makiya
Y. Matsuda
K. Nakanishi
T. Saito
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
T. Yamada
Y. Yamaguchi
M. Yun
Abstract
We report the results of 1farcm5 × 3' mapping at 1.1 mm with the Atacama Large Millimeter/submillimeter Array toward the central region of the z = 3.09 SSA22 protocluster. By combining our source catalog with archival spectroscopic redshifts, we find that eight submillimeter galaxies (SMGs) with flux densities, S1.1 mm = 0.7–6.4 mJy (LIR ~ 1012.1–1013.1 L⊙) are at z = 3.08–3.10. Not only are these SMGs members of the protocluster, but they in fact reside within the node at the junction of the 50 Mpc scale filamentary three-dimensional structure traced by Lyα emitters in this field. The eight SMGs account for a star formation rate density (SFRD) ~10 M⊙ yr−1 Mpc−3 in the node, which is two orders of magnitudes higher than the global SFRD at this redshift. We find that four of the eight SMGs host an X-ray-luminous active galactic nucleus. Our results suggest that the vigorous star formation activity and the growth of supermassive black holes (SMBHs) occurred simultaneously in the densest regions at z ~ 3, which may correspond to the most active historical phase of the massive galaxy population found in the core of the clusters in the present universe. Two SMGs are associated with Lyα blobs, implying that the two populations coexist in high-density environments for a few cases.
Citation
Umehata, H., Tamura, Y., Kohno, K., Ivison, R., Alexander, D., Geach, J., …Yun, M. (2015). ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core. Astrophysical Journal Letters, 815, Article L8. https://doi.org/10.1088/2041-8205/815/1/l8
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 29, 2015 |
Online Publication Date | Dec 4, 2015 |
Publication Date | Dec 10, 2015 |
Deposit Date | Feb 16, 2016 |
Publicly Available Date | Mar 28, 2024 |
Journal | Astrophysical Journal Letters |
Print ISSN | 2041-8205 |
Electronic ISSN | 2041-8213 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 815 |
Article Number | L8 |
DOI | https://doi.org/10.1088/2041-8205/815/1/l8 |
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Copyright Statement
© 2015. The American Astronomical Society. All rights reserved.
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