Michałowski 2007 四个宿主星系的观测

主要内容:
对GRBs 980703, 000210, 000418 and 010222四个暴的宿主星系的观测，发现这几个暗弱的星系相比一般星系：更热更年轻，更小更多尘。

这是不是就是伽玛暴宿主星系的普遍特征呢？

精彩摘抄:


文章信息:
The nature of GRB-selected submillimeter galaxies: hot and young

Authors: M. J. Michałowski, J. Hjorth, J. M. Castro Cerón, D. Watson (Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark)

(Submitted on 29 Aug 2007)

Abstract: We present detailed fits of the spectral energy distributions (SEDs) of four submillimeter (submm) galaxies selected by the presence of a gamma-ray burst (GRB) event (GRBs 980703, 000210, 000418 and 010222). These faint ~3 mJy submm emitters at redshift ~1 are characterized by an unusual combination of long- and short-wavelength properties, namely enhanced submm 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>45 K) indicate that GRB host galaxies are hotter, younger, and less massive counterparts to submm-selected galaxies detected so far. Future facilities like Herschel, JCMT/SCUBA-2 and ALMA will test this hypothesis enabling measurement of dust temperatures of fainter GRB-selected galaxies.


Spectral energy distributions of submm/radio bright gamma-ray burst host galaxies

Authors: M. J. Michałowski, J. Hjorth (Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Denmark)

(Submitted on 29 Aug 2007)

Abstract: We present optical to radio spectral energy distribution fitting of the host galaxies of four long gamma-ray bursts: 980703, 000210, 000418 and 010222, which were detected at submillimetre and/or radio wavelengths. We find that only very young starburst galaxy models are consistent with the data having both blue optical colors and a pronounced submm emission. For each host we are able to construct a model consistent with the short- and long-wavelength parts of the spectra. We find galaxy ages ranging from 0.09 to 2.0 Gyrs and star formation rates ranging from 138 to 380 MSun/yr.

Cite as:

arXiv:0708.4014v1 [astro-ph]