Herschel observations and a model for IRAS 08572+3915: a candidate for the most luminous infrared galaxy in the local (z < 0.2) Universe

Efstathiou, A, Pearson, C, Farrah, D, Rigopoulou, D, Graciá-Carpio, J, Verma, A, Spoon, H W W, Afonso, J, Bernard-Salas, J, Clements, D L, Cooray, A, Cormier, D, Etxaluze, M, Fischer, J, González-Alfonso, E, Hurley, P, Lebouteiller, V, Oliver, S J, Rowan-Robinson, M and Sturm, E (2014) Herschel observations and a model for IRAS 08572+3915: a candidate for the most luminous infrared galaxy in the local (z < 0.2) Universe. Monthly Notices of the Royal Astronomical Society: Letters, 437 (1). L16-L20. ISSN 1745-3933

[img]
Preview
PDF (This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.) - Published Version
Download (383kB) | Preview

Abstract

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 90percent of the total luminosity of 1.1 × 10 13 L ? , 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 0.05835 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 [O I ]63µm to [C II ]158µm line ratio of about 1 that supports the model presented in this Letter.

Item Type: Article
Keywords: radiative transfer–galaxies: active–galaxies: individual (IRAS 08572+3915)–infrared: galaxies
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0460 Astrophysics
Depositing User: Richard Chambers
Date Deposited: 08 Jun 2015 14:27
Last Modified: 07 Mar 2017 05:23
URI: http://sro.sussex.ac.uk/id/eprint/54328

View download statistics for this item

📧 Request an update