Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 437, Issue 1, Pages L16-L20Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slt131
Keywords
radiative transfer; galaxies: active; galaxies: individual (IRAS 08572+3915); infrared: galaxies
Categories
Funding
- US ONR
- NHSC
- Marie Curie Intra-European Fellowship within the 7th European Community Framework Program [272820]
- Spanish Ministerio de Economia y Competitividad [AYA2010-21697-C05-0, FIS2012-39162-C06-01]
- ASTROMADRID [S2009ESP-1496]
- ASTROMOL [CSD2009-00038]
- Spanish MINECO [AYA2009-07304, AYA2012-32032]
- Science and Technology Foundation (FCT, Portugal) [PTDC/CTE-AST/105287/2008, PEst-OE/FIS/UI2751/2011, PTDC/FIS-AST/2194/2012]
- STFC [ST/K00106X/1, ST/I005765/1, ST/L001314/1, ST/I000976/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L001314/1, ST/I000976/1, ST/K00106X/1, ST/I005765/1] Funding Source: researchfish
- UK Space Agency [ST/J004812/1, ST/G003874/1, ST/F012373/1] Funding Source: researchfish
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We present Herschel photometry and spectroscopy, carried out as part of the Herschel ultraluminous infrared galaxy (ULIRG) survey, and a model for the infrared to submillimetre emission of the ULIRG IRAS 08572+3915. This source shows one of the deepest known silicate absorption features and no polycyclic aromatic hydrocarbon emission. The model suggests that this object is powered by an active galactic nucleus (AGN) with a fairly smooth torus viewed almost edge-on and a very young starburst. According to our model, the AGN contributes about 90 per cent of the total luminosity of 1.1 x 10(13) L-circle dot, which is about a factor of 5 higher than previous estimates. The large correction of the luminosity is due to the anisotropy of the emission of the best-fitting torus. Similar corrections may be necessary for other local and high-z analogues. This correction implies that IRAS 08572+3915 at a redshift of 0.058 35 may be the nearest hyperluminous infrared galaxy and probably the most luminous infrared galaxy in the local (z < 0.2) Universe. IRAS 08572+3915 shows a low ratio of [C II] to IR luminosity (log L-[C II]/L-IR < -3.8) and a [OI] 63 mu m to [CII] 158 mu m line ratio of about 1 that supports the model presented in this Letter.
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