Probing the ambient medium of GRB 090618 with XMM-Newton observations

被引：7

作者：

Campana, S. ^{[1
]}

D'Avanzo, P. ^{[1
]}

Lazzati, D. ^{[2
]}

Covino, S. ^{[1
,3
]}

Tagliaferri, G. ^{[1
]}

Panagia, N. ^{[4
]}

机构：

[1] INAF Osservatorio Astron Brera, I-23807 Merate, Lc, Italy

[2] NC State Univ, Dept Phys, Raleigh, NC 27695 USA

[3] INAF TNG Fdn Galileo Galilei, Tenerife 38712, Spain

[4] Space Telescope Sci Inst, Baltimore, MD 21218 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2011年 / 418卷 / 03期

关键词：

gamma-ray burst: general; gamma-ray burst: individual: GRB 090618; X-rays: general; X-rays: ISM;

D O I：

10.1111/j.1365-2966.2011.19350.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Long gamma-ray bursts (GRBs) signal the death of massive stars. The afterglow emission can be used to probe the progenitor ambient through a detailed study of the absorption pattern imprinted by the circumburst material as well as the host galaxy interstellar medium on the continuum spectrum. This has been done at optical wavelengths with impressive results. Similar studies can in principle be carried out in the X-ray band, allowing us to shed light on the material metallicity, composition and distance of the absorber. We start exploiting this route through high-resolution spectroscopy XMMNewton observations of GRB 090618. We find a high-metallicity absorbing medium (Z? 0.2 Z?) with possible enhancements of S and Ne with respect to the other elements (improving the fit at a level of >3.4s). Including the metallicity effects on the X-ray column density determination, the X-ray and optical evaluations of the absorption are in agreement for a Small Magellanic Cloud extinction curve.

引用

页码：1511 / 1516

页数：6

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