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論文・著書情報
| タイトル |
| 和文: | |
| 英文: | "Dark" GRB 080325 in a Dusty Massive Galaxy at z ~ 2 |
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| 著者 |
| 和文: |
Hashimoto, T.,
Ohta, K.,
Aoki, K.,
Tanaka, I.,
Yabe, K.,
河合 誠之,
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. ..
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| 英文: |
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. ..
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| 言語 |
English |
| 掲載誌/書名 |
| 和文: | |
| 英文: | The Astrophysical Journal |
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巻, 号, ページ
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Vol. 719
pp. 378-384
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| 出版年月 |
2010年8月 |
| 出版者 |
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| 会議名称 |
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| 開催地 |
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| アブストラクト |
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 Ks 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 AV = 2.7-10 mag. This large extinction is probably the major reason for the optical faintness of GRB 080325. The J – Ks color of the host galaxy, (J – Ks = 1.3 in AB magnitude), is significantly redder than those for typical GRB hosts previously identified. In addition to J and Ks bands, optical images in B, Rc , 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 (AV = 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. |
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