A TALE OF THREE GALAXIES: ANOMALOUS DUST PROPERTIES IN IRAS F10398+1455, IRAS F21013–0739, AND SDSS J0808+3948
Journal Article
·
· Astrophysical Journal Letters
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030 (China)
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211 (United States)
On a galactic scale, the 9.7 μm silicate emission is usually only seen in type 1 active galactic nuclei (AGNs). They usually also display a flat emission continuum at ∼5-8 μm 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 μm emission continuum, strong 9.7 μm and 18 μm 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 μm emission continuum, the 9.7 and 18 μm 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.
- OSTI ID:
- 22364933
- Journal Information:
- Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 794; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
Similar Records
A tale of three galaxies: Deciphering THE infrared emission of the spectroscopically anomalous galaxies IRAS F10398+1455, IRAS F21013–0739, and SDSS J0808+3948
Silicate dust in active galactic nuclei
A complete census of silicate features in the mid-infrared spectra of active galaxies
Journal Article
·
Sat Aug 01 00:00:00 EDT 2015
· Astrophysical Journal
·
OSTI ID:22882837
Silicate dust in active galactic nuclei
Journal Article
·
Sat Dec 31 23:00:00 EST 2016
· Astrophysical Journal, Supplement Series
·
OSTI ID:22872853
A complete census of silicate features in the mid-infrared spectra of active galaxies
Journal Article
·
Mon Apr 20 00:00:00 EDT 2015
· Astrophysical Journal
·
OSTI ID:22883270