期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 794, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/794/2/L19
关键词
dust, extinction; galaxies: active; galaxies: individual (IRAS F10398+1455, IRAS F21013-0739, SDSS J0808+3948); infrared: galaxies
资金
- 973 Program of China [2013CB834905, 2009CB824800]
- Strategic Priority Research Program The Emergence of Cosmological Structures of the Chinese Academy of Sciences [XDB09030200]
- Shanghai Pujiang Talents Program [10pj1411800]
- NSFC [11073040]
- NSF [AST-1311804]
- NASA [NNX14AF68G]
- JPL
- NASA [NNX14AF68G, 684063] Funding Source: Federal RePORTER
On a galactic scale, the 9.7 mu m silicate emission is usually only seen in type 1 active galactic nuclei (AGNs). They usually also display a flat emission continuum at similar to 5-8 mu m and the absence of polycyclic aromatic hydrocarbon (PAH) emission bands. In contrast, starburst galaxies, luminous infrared (IR) galaxies, and ultraluminous IR galaxies exhibit a red 5-8 mu m emission continuum, strong 9.7 mu m and 18 mu m silicate absorption features, and strong PAH emission bands. Here, we report the detection of anomalous dust properties by the Spitzer/Infrared Spectrograph in three galaxies (IRAS F10398+1455, IRAS F21013-0739, and SDSS J0808+3948) which are characterized by the simultaneous detection of a red 5-8 mu m emission continuum, the 9.7 and 18 mu m silicate emission features, as well as strong PAH emission bands. These apparently contradictory dust IR emission properties are discussed in terms of iron-poor silicate composition, carbon dust deficit, small grain size, and low dust temperature in the young AGN phase of these three galaxies.
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