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Deep SAURON spectral imaging of the diffuse Lyman α halo LAB1 in SSA 22

Bower, R. G. and Morris, S. L. and Bacon, R. and Wilman, R. J. and Sullivan, M. and Chapman, S. and Davies, R. L. and de Zeeuw, P. T. and Emsellem, E. (2004) Deep SAURON spectral imaging of the diffuse Lyman α halo LAB1 in SSA 22. Monthly Notices of the Royal Astronomical Society, 351 (1). pp. 63-69. ISSN 0035-8711.

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We have used the SAURON panoramic integral field spectrograph to study the structure of the Lyα emission-line halo, LAB1, surrounding the submillimetre galaxy SMM J221726+0013. This emission-line halo was discovered during a narrow-band imaging survey of the z= 3.1 large-scale structure in the SSA 22 region. Our observations trace the emission halo out to almost 100 kpc from the submillimetre source and identify two distinct Lyα‘mini-haloes’ around the nearby Lyman-break galaxies. The main emission region has a broad line profile, with variations in the line profile seeming chaotic and lacking evidence for a coherent velocity structure. The data also suggest that Lyα emission is suppressed around the submillimetre source. Interpretation of the line structure needs care because Lyα may be resonantly scattered, leading to complex radiative transfer effects, and we suggest that the suppression in this region arises because of such effects. We compare the structure of the central emission-line halo with local counterparts, and find that the emission-line halo around NGC 1275 in the Perseus cluster may be a good local analogue, although the high-redshift halo is factor of ∼100 more luminous and appears to have higher velocity broadening. Around the Lyman-break galaxy C15, the emission line is narrower, and a clear shear in the emission wavelength is seen. A plausible explanation for the line profile is that the emission gas is expelled from C15 in a bipolar outflow, similar to that seen in M82.

Item Type:Article
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URLURL TypeDescription Paper
Sullivan, M.0000-0001-9053-4820
Davies, R. L.0000-0002-3324-4824
Alternate Title:Deep SAURON Spectral-Imaging of the diffuse Lyman-alpha halo LAB1 in SSA22
Additional Information:© 2004 RAS. Accepted 2004 February 27. Received 2004 February 27; in original form 2003 November 6. We thank the SAURON instrument team for their support of this programme, and for creating an instrument with the superb sensitivity of SAURON. It is a pleasure to thank the ING staff, in particular Rene Rutten, Tom Gregory and Chris Benn, for enthusiastic and competent support on La Palma. The construction of SAURON was made possible through grants 614.13.003 and 781.74.203 from ASTRON/NWO and financial contributions from the Institut National des Sciences de l'Univers, the Université Claude Bernard Lyon-I, the universities of Durham and Leiden, the British Council, PPARC grant ‘Extragalactic Astronomy & Cosmology at Durham 1998–2002’ and the Netherlands Research School for Astronomy NOVA. RGB is pleased to acknowledge the support of fellowships from PPARC and the Leverhulme foundation.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)614.13.003
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)781.74.203
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Université Claude Bernard Lyon-IUNSPECIFIED
University of DurhamUNSPECIFIED
University of LeidenUNSPECIFIED
British CouncilUNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Nederlandse Onderzoekschool voor de Astronomie (NOVA)UNSPECIFIED
Leverhulme TrustUNSPECIFIED
Subject Keywords:galaxies: haloes – galaxies: high redshift
Issue or Number:1
Record Number:CaltechAUTHORS:20170408-201124405
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Official Citation:R. G. Bower, S. L. Morris, R. Bacon, R. J. Wilman, M. Sullivan, S. Chapman, R. L. Davies, P. T. De Zeeuw, E. Emsellem; Deep SAURON spectral imaging of the diffuse Lyman α halo LAB1 in SSA 22, Monthly Notices of the Royal Astronomical Society, Volume 351, Issue 1, 11 June 2004, Pages 63–69,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76380
Deposited By: 1Science Import
Deposited On:30 Mar 2018 21:58
Last Modified:09 Mar 2020 13:18

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