The Nature of GRB-selected Submillimeter Galaxies: Hot and Young
Abstract
We present detailed fits of the spectral energy distributions (SEDs) of four submillimeter galaxies selected by the presence of a gamma-ray burst (GRB) event (GRBs 980703, 000210, 000418, and 010222). These faint ~3 mJy submillimeter emitters at redshift ~1 are characterized by an unusual combination of long- and short-wavelength properties, namely enhanced submillimeter and/or radio emission combined with optical faintness and blue colors. We exclude an active galactic nucleus as the source of long-wavelength emission. From the SED fits, we conclude that the four galaxies are young (ages <2 Gyr), highly star forming (star formation rates ~150 M⊙ yr-1), low mass (stellar masses ~1010 M⊙), and dusty (dust masses ~3 × 108 M⊙). Their high dust temperatures (Tdgtrsim 45 K) indicate that GRB host galaxies are hotter, younger, and less massive counterparts to the submillimeter-selected galaxies detected so far. Future facilities like Herschel, the James Clerk Maxwell Telescope SCUBA-2, and ALMA will test this hypothesis, enabling measurement of dust temperatures of fainter GRB-selected galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2008
- DOI:
- 10.1086/523891
- arXiv:
- arXiv:0708.3850
- Bibcode:
- 2008ApJ...672..817M
- Keywords:
-
- dust;
- extinction;
- galaxies: evolution;
- galaxies: high-redshift;
- galaxies: ISM;
- galaxies: starburst;
- gamma rays: bursts;
- Astrophysics
- E-Print:
- 9 pages, 2 figures, submitted to ApJ, for SED templates, see http://archive.dark-cosmology.dk/