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Extremely Red mid-infrared selected objects in the AKARI NEP deep field: dust obscured type-1 AGN?

Matsuhara, Hideo; Wada, Takehiko; Oyabu, Shinki; Takagi, Toshinobu; Pearson, Chris P.; Malkan, Matthew A.; White, Glenn J.; Negrello, Mattia; Serjeant, Stephen; Ohyama, Youichi; Goto, Tomotsugu; Im, Myungshin; Lee, Hyung Mok; Lee, Myung Gyoon; Imai, Koji; Hanami, Hitoshi; Ishigaki, Tsuyoshi; Wada, Kensuke and Nakagawa, Takao (2009). Extremely Red mid-infrared selected objects in the AKARI NEP deep field: dust obscured type-1 AGN? In: ASP Conference Series, 16-19 Feb 2009, Tokyo.

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Abstract

We describe observational characteristics of three Extremely Red MIR-bright Objects (ERMOs, satisfying R - [15] ≥ 6.5 AB mag) found in the AKARI North Ecliptic Pole (NEP) deep field at z=1.5-2.2, showing broad Mg II emission (~5000 km sec-1) while their broad-band spectral energy distributions (SEDs) at optical and mid-infrared are power-law, similar to that of the type- 2 AGN. Since their SEDs cannot be explained solely by any AGN dust torus templates, we propose that the stellar population co-exists with the AGN dust torus. The interstellar dust clouds associated with the stellar population may be responsible for the extinction of the broad-line regions.

Item Type: Conference Item
Copyright Holders: 2009 Astronomical Society of the Pacific
Extra Information: AKARI, a light to illuminate the misty universe
Proceedings of a conference held at Fukutake Hall, The University of Tokyo, Tokyo, Japan 16–19 February 2009.
Astronomical Society of the Pacific Conference Series Vol.418
Edited by Takashi Onaka, Glenn J. White, Takao Nakagawa, Issei Yamamura
ISBN: 978-1-58381-716-2
e-book ISBN: 978-1-58381-717-9
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
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Item ID: 25512
Depositing User: Astrid Peterkin
Date Deposited: 06 Jan 2011 10:52
Last Modified: 20 Nov 2012 19:21
URI: http://oro.open.ac.uk/id/eprint/25512
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