主要内容:
而看起来的T90的多样性来自1.穿出包层的时间；2.不同观测角；3.不同红移所导致的修正。
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| Title: |
| On the observed duration distribution of gamma-ray bursts from collapsars |
| Authors: |
| Lazzati, D.; Villeneuve, M.; López-Cámara, D.; Morsony, B. J.; Perna, R. |
| Affiliation: |
| AA(Department of Physics, NC State University, 2401 Stinson Drive, Raleigh, NC 27695-8202, USA; davide_lazzati@ncsu.edu),
AB(Department of Astrophysical and Planetary Sciences, University of
Colorado, Boulder, CO 80309-0391, USA), AC(Department of Physics, NC
State University, 2401 Stinson Drive, Raleigh, NC 27695-8202, USA),
AD(Department of Astronomy, University of Wisconsin-Madison, 3321
Sterling Hall, 475 N. Charter Street, Madison, WI 53706-1582, USA),
AE(Department of Astrophysical and Planetary Sciences, University of
Colorado, Boulder, CO 80309-0391, USA; JILA, University of Colorado and
National Institute of Standards and Technology, Boulder, CO 80309-0440,
USA) |
| Publication: |
| Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 2, p.1867-1872 (MNRAS Homepage) |
| Publication Date: |
| 12/2013 |
| Origin: |
| OUP |
| Astronomy Keywords: |
| hydrodynamics, methods: numerical, gamma-ray burst: general |
| Abstract Copyright: |
| 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
| DOI: |
| 10.1093/mnras/stt1705 |
| Bibliographic Code: |
| 2013MNRAS.436.1867L |
Abstract
The duration of the prompt emission of long gamma-ray bursts is
generally considered to be fairly similar to the duration of the
activity of the engine in the
centre of the progenitor star. Here, we
investigate the relation between the duration of the engine activity and
that of the observed light curve, using
inputs from both numerical
simulations and observations. We find that the observed burst duration
is a good proxy for the engine duration after the time necessary for the
jet to break out the star's surface is subtracted. However, the observed
duration is a function of the viewing angle and can be significantly
shorter than the duration of the engine activity. We also show that the
observed,
redshift-corrected burst duration evolves only moderately with
redshift for both observations and synthetic light curves. We conclude
that the broad distribution of the observed duration of long Burst And
Transient Sources Experiment (BATSE) gamma-ray bursts
is mostly
accounted for by an engine lasting ˜20 s, the dispersion being due
to
viewing and
redshift effects. Our results do not rule out the
existence of engines with very long duration. However, we find that they
are constrained to be a small minority of the BATSE detected bursts.
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