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.

URL: http://adsabs.harvard.edu/abs/2009ASPC..418..515M

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.

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