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Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS

Valtchanov, I. and Riechers, D. and Carpenter, J. and Vieira, J. D. (2011) Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS. Monthly Notices of the Royal Astronomical Society, 415 (4). pp. 3473-3484. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20110926-112601773

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Abstract

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 [O iii] 88 μm and [C ii] 158 μm 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 200 mJy in the 200–600 μm wavelength range. The derived redshift of SDP.81 from the two detections is z = 3.043 ± 0.012, in agreement with ground-based CO measurements. This is the first detection by Herschel of the [O iii] 88 μm 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 density n ≈ 2000 cm^(−3) and the far-ultraviolet ionizing radiation field G_0≈ 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 500–700 pc. 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 [O iii]/FIR ratio and the upper limit of [O i] 63 μm/[C ii] 158 μm, suggest that some fraction of the ionizing radiation is likely to originate from the AGN.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1365-2966.2011.18959.xDOIArticle
ORCID:
AuthorORCID
Valtchanov, I.0000-0001-9930-7886
Riechers, D.0000-0001-9585-1462
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 April 24. Received 2011 April 20; in original form 2011 March 21. Article first published online: 22 Jun 2011. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We are indebted to S. Hailey-Dunsheath for making available his script and the data used to produce some of the figures, as well as for his valuable help with some of the interpretations. We thank Magda Vasta and Serena Viti for useful discussions. The Herschel-ATLAS is a project with Herschel, which is an ESA space observatory with science instruments provided by European led Principal Investigator consortia and with important participation from NASA. The H-ATLAS website is http://www.h-atlas.org/. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAFIFSI/ OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy);MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA).
Funders:
Funding AgencyGrant Number
Bundesministerium für Verkehr, Innovation und Technologie (BMVIT)UNSPECIFIED
ESA-PRODEX (Belgium)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Comisión Interministerial de Ciencia y Tecnología (CICYT)UNSPECIFIED
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
NASAUNSPECIFIED
Ministerio de Ciencia Y Tecnologia (MCYT)UNSPECIFIED
Subject Keywords: galaxies: evolution; galaxies: individual: SDP.81: H-ATLAS J090311.6+003906; galaxies: individual: SDP.130: H-ATLAS J091305.0−005343; infrared: galaxies; radio continuum: galaxies; submillimetre: ISM
Issue or Number:4
Record Number:CaltechAUTHORS:20110926-112601773
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110926-112601773
Official Citation:Valtchanov, I., Virdee, J., Ivison, R. J., Swinyard, B., van der Werf, P., Rigopoulou, D., da Cunha, E., Lupu, R., Benford, D. J., Riechers, D., Smail, I., Jarvis, M., Pearson, C., Gomez, H., Hopwood, R., Altieri, B., Birkinshaw, M., Coia, D., Conversi, L., Cooray, A., De Zotti, G., Dunne, L., Frayer, D., Leeuw, L., Marston, A., Negrello, M., Portal, M. S., Scott, D., Thompson, M. A., Vaccari, M., Baes, M., Clements, D., Michałowski, M. J., Dannerbauer, H., Serjeant, S., Auld, R., Buttiglione, S., Cava, A., Dariush, A., Dye, S., Eales, S., Fritz, J., Ibar, E., Maddox, S., Pascale, E., Pohlen, M., Rigby, E., Rodighiero, G., Smith, D. J. B., Temi, P., Carpenter, J., Bolatto, A., Gurwell, M. and Vieira, J. D. (2011), Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS. Monthly Notices of the Royal Astronomical Society, 415: 3473–3484. doi: 10.1111/j.1365-2966.2011.18959.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25437
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Sep 2011 18:52
Last Modified:03 Oct 2019 03:06

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