C. Sedgwick
Detection of Hα emission from z > 3.5 submillimetre luminous galaxies with AKARI-FUHYU spectroscopy
Sedgwick, C.; Serjeant, S.; Pearson, C.; Smail, I.; Im, M.; Oyabu, S.; Takagi, T.; Matsuhara, H.; Wada, T.; Lee, H.M.; Jeong, W.-S.; White, G.J.
Authors
S. Serjeant
C. Pearson
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
M. Im
S. Oyabu
T. Takagi
H. Matsuhara
T. Wada
H.M. Lee
W.-S. Jeong
G.J. White
Abstract
We present tentative Hα emission line detections of four submillimetre-detected galaxies at z > 3.5: the radio galaxies 8C1909+722 and 4C60.07 at signal-to-noise ratios (SNRs) of 3.1 and 2.5, and two submillimetre-selected galaxies (SMGs) near the first of these at SNRs of 10.0 and 2.4, made with the AKARI space telescope as part of the Follow-Up Hayai-Yasui-Umai mission programme. These are the highest redshift Hα detections in such galaxies, made possible by AKARI's unique near-infrared spectroscopic capability. The two radio galaxies had known redshifts and surrounding structure, and we have detected broad Hα components indicating the presence of dust-shrouded quasars. We conclude that powerful active galactic nuclei (AGNs) at z > 3.5 occur in peaks of the star formation density fields, supporting a close connection between stellar mass build-up and black hole mass assembly at this redshift. We also show that 4C60.07 is a binary AGN. The Hα detections of the two SMGs are the first redshift determinations for these sources, confirming their physical association around their companion radio galaxy. The Hα-derived star formation rates (SFRs) for the SMGs are lower than their far-infrared derived SFRs by a factor of ∼10, suggesting a level of dust obscuration similar to that found in studies at ∼1 < z < 2.7.
Citation
Sedgwick, C., Serjeant, S., Pearson, C., Smail, I., Im, M., Oyabu, S., …White, G. (2013). Detection of Hα emission from z > 3.5 submillimetre luminous galaxies with AKARI-FUHYU spectroscopy. Monthly Notices of the Royal Astronomical Society, 436(1), 395-400. https://doi.org/10.1093/mnras/stt1572
Journal Article Type | Article |
---|---|
Publication Date | Nov 1, 2013 |
Deposit Date | Apr 15, 2014 |
Publicly Available Date | Mar 28, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 436 |
Issue | 1 |
Pages | 395-400 |
DOI | https://doi.org/10.1093/mnras/stt1572 |
Keywords | Galaxies: active, Galaxies: evolution, Galaxies: starburst, Galaxies: star formation, Infrared: galaxies. |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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