Hashimoto 2010 暗暴GRB 080325是在一个尘埃很多的大质量星系中

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也就是说暗的原因是尘埃咯

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Title:		"Dark" GRB 080325 in a Dusty Massive Galaxy at z ~ 2
Authors:		Hashimoto, T.; Ohta, K.; Aoki, K.; Tanaka, I.; Yabe, K.; Kawai, N.; Aoki, W.; Furusawa, H.; Hattori, T.; Iye, M.; Kawabata, K. S.; Kobayashi, N.; Komiyama, Y.; Kosugi, G.; Minowa, Y.; Mizumoto, Y.; Niino, Y.; Nomoto, K.; Noumaru, J.; Ogasawara, R.; Pyo, T.-S.; Sakamoto, T.; Sekiguchi, K.; Shirasaki, Y.; Suzuki, M.; Tajitsu, A.; Takata, T.; Tamagawa, T.; Terada, H.; Totani, T.; Watanabe, J.; Yamada, T.; Yoshida, A.
Affiliation:		AA(Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan ),
Publication:		The Astrophysical Journal, Volume 719, Issue 1, pp. 378-384 (2010). (ApJ Homepage)
Publication Date:		08/2010
Origin:		IOP
ApJ Keywords:		galaxies: photometry, gamma-ray burst: individual: GRB 080325, gamma rays: galaxies
DOI:		10.1088/0004-637X/719/1/378
Bibliographic Code:		2010ApJ...719..378H

Abstract

We present optical and near-infrared observations of Swift GRB 080325 classified as a "dark gamma-ray burst (GRB)." Near-infrared observations with Subaru/MOIRCS provided a clear detection of afterglow in the K_s band, although no optical counterpart was reported. The flux ratio of rest-wavelength optical to X-ray bands of the afterglow indicates that the dust extinction along the line of sight to the afterglow is A_V = 2.7-10 mag. This large extinction is probably the major reason for the optical faintness of GRB 080325. The J – K_s color of the host galaxy, (J – K_s = 1.3 in AB magnitude), is significantly redder than those for typical GRB hosts previously identified. In addition to J and K_s bands, optical images in B, R_c , i', and z' bands with Subaru/Suprime-Cam were obtained at about 1 year after the burst, and a photometric redshift of the host is estimated to be z _photo = 1.9. The host luminosity is comparable to L* at z ~ 2 in contrast to the sub-L* property of typical GRB hosts at lower redshifts. The best-fit stellar population synthesis model for the host shows that the red nature of the host is attributed to a large dust extinction (A_V = 0.8 mag), and that the host galaxy is massive (M* = 7.0 × 10¹⁰ M _sun), which makes it one of the most massive GRB hosts yet identified. By assuming that the mass-metallicity relation for star-forming galaxies at z ~ 2 is applicable for the GRB host, this large stellar mass suggests the high-metallicity environment around GRB 080325, consistent with inferred large extinction. Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

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