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首页> 外文期刊>The Astrophysical journal >INFRARED AND OPTICAL OBSERVATIONS OF GRB 030115 AND ITS EXTREMELY RED HOST GALAXY: IMPLICATIONS FOR DARK BURSTS
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INFRARED AND OPTICAL OBSERVATIONS OF GRB 030115 AND ITS EXTREMELY RED HOST GALAXY: IMPLICATIONS FOR DARK BURSTS

机译：GRB 030115及其极端的红色宿主银河系的红外和光学观察：对暗爆发的影响

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摘要

We present near-infrared (NIR) and optical observations of the afterglow of GRB 030115. Discovered in an infrared search at Kitt Peak 5 hr after the burst trigger, this afterglow is the faintest ever observed in the R band at such an early epoch and exhibits very red colors, with R - K ≈ 6. The optical magnitude of the afterglow of GRB 030115 is fainter than many upper limits for other bursts, suggesting that without early NIR observations it would have been classified as a "dark" burst. Both the color and optical magnitude of the afterglow are likely due to dust extinction at moderate redshift z > 2 and indicate that at least some optical afterglows are very faint due to dust along the line of sight. Multicolor Hubble Space Telescope observations were also taken of the host galaxy and the surrounding field. Photometric redshifts imply that the host and a substantial number of faint galaxies in the field are at z ～ 2.5. The overdensity of galaxies is sufficiently great that GRB 030115 may have occurred in a rich high-redshift cluster. The host galaxy shows extremely red colors (R - K = 5) and is the first GRB host to be classified as an extremely red object (ERO). Some of the galaxies surrounding the host also show very red colors, while the majority of the cluster are much bluer, indicating ongoing unobscured star formation. As it is thought that much of high-redshift star formation occurs in highly obscured environments, it may well be that GRB 030115 represents a transition object, between the relatively unobscured afterglows seen to date and a population of objects that are very heavily extinguished, even in the NIR.
机译：我们介绍了GRB 030115余辉的近红外（NIR）和光学观察。在爆发触发后5小时，在基特峰的红外搜索中发现了这种余辉，这是在如此早期的R波段观察到的最暗的辉光。呈现出非常红色，R-K≈6。GRB030115余辉的光学强度比其他猝发的许多上限要弱，这表明如果没有早期的NIR观察，它将被归类为“暗”猝发。余辉的颜色和光学强度都可能是由于在适度红移z> 2时粉尘熄灭所致，并且表明至少有一些光学余辉由于沿视线的灰尘而非常微弱。哈勃太空望远镜还对多色哈勃太空望远镜进行了观测，观测了宿主星系和周围的视野。光度红移表明该主场和该场中大量微弱的星系在z〜2.5处。星系的密度足够大，以至于GRB 030115可能已在富高红移星团中发生。宿主星系显示极红色（R-K = 5），并且是第一个被分类为极红色物体（ERO）的GRB宿主。宿主周围的一些星系也显示出非常红的颜色，而星团中的大多数星系则更蓝，这表明正在进行的恒星正在形成。据认为，许多高红移星的形成是在高度遮蔽的环境中发生的，很可能GRB 030115代表了一个过渡天体，介于迄今看到的相对不遮盖的余辉与大量被严重熄灭的天体之间，甚至在NIR中。

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