The origin of blue-shifted absorption lines in a gamma-ray burst afterglow

A. J. Van Marle; N. Langer; G. García-Segura

The origin of blue-shifted absorption lines in a gamma-ray burst afterglow

A. J. Van Marle^*
, N. Langer
, G. García-Segura

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The afterglow spectrum of GRB 021004 shows a system of blue-shifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000 km/s. We propose that these lines are the result of absorption by circumstellar matter, which was ejected by gamma-ray burst progenitor (a massive star) during its evolution. We have simulated the evolution of the circumstellar medium around such a star and find that the evolutionary sequence: main-sequence, Red Supergiant, Wolf-Rayet star can qualitatively reproduce the various absorption lines systems.

Original language	English
Pages (from-to)	533-536
Number of pages	4
Journal	Nuovo Cimento della Societa Italiana di Fisica C
Volume	28
Issue number	4-5
State	Published - 2005
Externally published	Yes

Cite this

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abstract = "The afterglow spectrum of GRB 021004 shows a system of blue-shifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000 km/s. We propose that these lines are the result of absorption by circumstellar matter, which was ejected by gamma-ray burst progenitor (a massive star) during its evolution. We have simulated the evolution of the circumstellar medium around such a star and find that the evolutionary sequence: main-sequence, Red Supergiant, Wolf-Rayet star can qualitatively reproduce the various absorption lines systems.",

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AU - Van Marle, A. J.

AU - Langer, N.

AU - García-Segura, G.

PY - 2005

Y1 - 2005

N2 - The afterglow spectrum of GRB 021004 shows a system of blue-shifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000 km/s. We propose that these lines are the result of absorption by circumstellar matter, which was ejected by gamma-ray burst progenitor (a massive star) during its evolution. We have simulated the evolution of the circumstellar medium around such a star and find that the evolutionary sequence: main-sequence, Red Supergiant, Wolf-Rayet star can qualitatively reproduce the various absorption lines systems.

AB - The afterglow spectrum of GRB 021004 shows a system of blue-shifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000 km/s. We propose that these lines are the result of absorption by circumstellar matter, which was ejected by gamma-ray burst progenitor (a massive star) during its evolution. We have simulated the evolution of the circumstellar medium around such a star and find that the evolutionary sequence: main-sequence, Red Supergiant, Wolf-Rayet star can qualitatively reproduce the various absorption lines systems.

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JF - Nuovo Cimento della Societa Italiana di Fisica C

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ER -

The origin of blue-shifted absorption lines in a gamma-ray burst afterglow

Abstract

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