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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS
Monthly Notices of the Royal Astronomical Society, Volume 415, No. 4, Year 2011
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Description
We present Herschel-Spectral and Photometric Imaging Receiver (SPIRE) Fourier transform spectrometer (FTS) and radio follow-up observations of two Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS)-detected strongly lensed distant galaxies. In one of the targeted galaxies H-ATLAS J090311.6+003906 (SDP.81), we detect [Oiii]88μm and [Cii]158μm lines at a signal-to-noise ratio of ~5. We do not have any positive line identification in the other fainter target H-ATLAS J091305.0-005343 (SDP.130). Currently, SDP.81 is the faintest submillimetre galaxy with positive line detections with the FTS, with continuum flux just below 200mJy in the 200-600μm wavelength range. The derived redshift of SDP.81 from the two detections isz= 3.043 ± 0.012, in agreement with ground-based CO measurements. This is the first detection byHerschelof the [Oiii]88μm line in a galaxy at redshift higher than 0.05. Comparing the observed lines and line ratios with a grid of photodissociation region (PDR) models with different physical conditions, we derive the PDR cloud densityn≈ 2000cm-3 and the far-ultraviolet ionizing radiation fieldG0≈ 200 (in units of the Habing field - the local Galactic interstellar radiation field of 1.6 × 10-6 W m-2). Using the CO-derived molecular mass and the PDR properties, we estimate the effective radius of the emitting region to be 500-700pc. These characteristics are typical for star-forming, high-redshift galaxies. The radio observations indicate that SDP.81 deviates significantly from the local far-infrared/radio (FIR/radio) correlation, which hints that some fraction of the radio emission is coming from an active galactic nucleus (AGN). The constraints on the source size from millimetre-wave observations put a very conservative upper limit of the possible AGN contribution to less than 33 per cent. These indications, together with the high [Oiii]/FIR ratio and the upper limit of [Oi]63μm/[Cii]158μm, suggest that some fraction of the ionizing radiation is likely to originate from the AGN. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Valtchanov, Ivan
Spain, Madrid
European Space Astronomy Centre
Virdee, J. S.
United Kingdom, Didcot
Ral Space
United Kingdom, Oxford
University of Oxford
Ivison, Robert J.
United Kingdom, Edinburgh
Royal Observatory
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Swinyard, Bruce M.
United Kingdom, Didcot
Ral Space
United Kingdom, London
University College London
van der Werf, Paul P.
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Netherlands, Leiden
Sterrewacht Leiden
Rigopoulou, Dimitra
United Kingdom, Didcot
Ral Space
United Kingdom, Oxford
University of Oxford
da Cunha, Elisabete
Greece, Rethymnon
University of Crete
Germany, Heidelberg
Max Planck Institute for Astronomy
Lupu, Roxana E.
United States, Philadelphia
University of Pennsylvania
Benford, Dominic J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Riechers, Dominick A.
United States, Pasadena
California Institute of Technology
Smail, Ian R.
United Kingdom, Durham
Durham University
Jarvis, Matthew J.
United Kingdom, Hatfield
University of Hertfordshire
Pearson, Christopher P.
United Kingdom, Didcot
Ral Space
Gomez, Haley L.
United Kingdom, Cardiff
Cardiff University
Hopwood, Rosalind H.B.
United Kingdom, London
Imperial College London
Altieri, Bruno
Spain, Madrid
European Space Astronomy Centre
Birkinshaw, Mark
United Kingdom, Bristol
University of Bristol
Coia, D.
Spain, Madrid
European Space Astronomy Centre
Conversi, Luca
Spain, Madrid
European Space Astronomy Centre
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
de Zotti, Gianfranco
Italy, Padua
Osservatorio Astronomico Di Padova
Italy, Trieste
Scuola Internazionale Superiore Di Studi Avanzati
Dunne, Loretta
United Kingdom, Nottingham
University of Nottingham
Frayer, David T.
United States, Green Bank
Nrao, Green Bank
Leeuw, Lerothodi L.
South Africa, Johannesburg
University of Johannesburg
United States, Mountain View
Seti Institute
Marston, Anthony P.
Spain, Madrid
European Space Astronomy Centre
Negrello, Mattia
United Kingdom, Milton Keynes
The Open University
Śanchez-Portal, Miguel
Spain, Madrid
European Space Astronomy Centre
Scott, Douglas J.
Canada, Vancouver
The University of British Columbia
Thompson, Mark A.
United Kingdom, Nottingham
University of Nottingham
Vaccari, Mattia
Italy, Padua
Università Degli Studi Di Padova
Baes, Maarten
Belgium, Ghent
Universiteit Gent
Clements, David L.
United Kingdom, London
Imperial College London
Michałowski, Michał J.
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Dannerbauer, Helmut
France, Gif-sur-yvette
Cea Saclay
Serjeant, Stephen B.G.
United Kingdom, Milton Keynes
The Open University
Auld, Robbie R.
United Kingdom, Cardiff
Cardiff University
Buttiglione, Sara
Italy, Padua
Università Degli Studi Di Padova
Cava, Antonio
Spain, Madrid
Universidad Complutense de Madrid
Dariush, Aliakbar A.
United Kingdom, Cardiff
Cardiff University
Iran, Tehran
Iranian Research Institute for Fundamental Sciences
Dye, S.
United Kingdom, Cardiff
Cardiff University
Eales, Stephen A.
United Kingdom, Cardiff
Cardiff University
Fritz, Jacopo
Belgium, Ghent
Universiteit Gent
Ibar, E.
United Kingdom, Edinburgh
Royal Observatory
Maddox, Steve J.
United Kingdom, Nottingham
University of Nottingham
Pascale, Enzo
United Kingdom, Cardiff
Cardiff University
Pohlen, Michael
United Kingdom, Cardiff
Cardiff University
Rigby, Emma E.
United Kingdom, Nottingham
University of Nottingham
Rodighiero, Giulia
Italy, Padua
Università Degli Studi Di Padova
Smith, Daniel James B.
United Kingdom, Nottingham
University of Nottingham
Temi, Pasquale
United States, Moffett Field
Nasa Ames Research Center
Carpenter, John M.
United States, Pasadena
California Institute of Technology
Bolatto, Alberto D.
United States, College Park
University of Maryland, College Park
Gurwell, Mark A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Vieira, Joaquin D.
United States, Pasadena
California Institute of Technology
Statistics
Citations: 73
Authors: 54
Affiliations: 34
Identifiers
Doi:
10.1111/j.1365-2966.2011.18959.x
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Cancer
Environmental
Study Design
Cross Sectional Study
Cohort Study
Study Approach
Quantitative