2019MNRAS.485..474A


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.28CET22:54:29

2019MNRAS.485..474A - Mon. Not. R. Astron. Soc., 485, 474-497 (2019/May-1)

Testing a model for subphotospheric dissipation in GRBs: fits to Fermi data constrain the dissipation scenario.

AHLGREN B., LARSSON J., AHLBERG E., LUNDMAN C., RYDE F. and PE'ER A.

Abstract (from CDS):

It has been suggested that the prompt emission in gamma-ray bursts (GRBs) could be described by radiation from the photosphere in a hot fireball. Such models must be tested by directly fitting them to data. In this work we use data from the Fermi Gamma-ray Space Telescope and consider a specific photospheric model, in which the kinetic energy of a low-magnetization outflow is dissipated locally by internal shocks below the photosphere. We construct a table model with a physically motivated parameter space and fit it to time-resolved spectra of the 36 brightest Fermi GRBs with a known redshift. We find that about two-thirds of the examined spectra cannot be described by the model, as it typically underpredicts the observed flux. However, since the sample is strongly biased towards bright GRBs, we argue that this fraction will be significantly lowered when considering the full population. From the successful fits we find that the model can reproduce the full range of spectral slopes present in the sample. For these cases we also find that the dissipation consistently occurs at a radius of ∼1012 cm and that only a few per cent efficiency is required. Furthermore, we find a positive correlation between the fireball luminosity and the Lorentz factor. Such a correlation has been previously reported by independent methods. We conclude that if GRB spectra are due to photospheric emission, the dissipation cannot only be the specific scenario we consider here.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiation mechanisms: thermal - gamma-ray burst: general

Status at CDS:   waiting for electronic table
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Simbad objects: 39

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Number of rows : 39

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GRB 081221 gB 01 03 10.2 -24 32 53           ~ 116 0
2 GRB 100814A gB 01 29 53.61 -17 59 43.6           ~ 146 0
3 GRB 100906A gB 01 54 44.19 +55 37 49.8           ~ 151 0
4 SN 2009nz SN* 02 26 19.87 -18 57 08.6           ~ 221 1
5 GRB 130925A gB 02 44 42.38 -26 09 15.8           ~ 111 0
6 SN 2013ez SN* 02 53 56.70 +13 23 13.6           ~ 68 0
7 GRB 090926B gB 03 05 14.30 -38 59 50.9           ~ 109 1
8 GRB 131105A gB 04 43 53.50 -63 00 17.7           ~ 50 0
9 GRB 100728A gB 05 55 01.99 -15 15 20.1           ~ 96 0
10 GRB 081121 gB 05 57 07.70 -60 36 42.1           ~ 107 0
11 GRB 120711A gB 06 18 42.839 -70 59 56.78           ~ 72 0
12 GRB 140213A gB 07 00 37.18 -73 08 14.1           ~ 48 0
13 GRB 100724B gB 07 58 +75.9           ~ 72 0
14 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 311 0
15 GRB 120119A gB 08 00 06.940 -09 04 53.83           ~ 110 0
16 GRB 150314A gB 08 26 40.90 +63 50 03.5           ~ 52 0
17 GRB 090516A gB 09 12 59 -11 50.9           ~ 119 0
18 GRB 140206A gB 09 41 16.90 +66 45 42.7           ~ 78 0
19 GRB 111228A gB 10 00 16.04 +18 17 52.2           ~ 129 0
20 GRB 090424 gB 12 38 07.40 +16 49 45.9           ~ 197 0
21 GRB 090323 gB 12 42 50.28 +17 03 11.9           ~ 182 1
22 GRB 100414A gB 12 48 30.0 +08 41 35           ~ 95 0
23 GRB 130420A gB 13 04 25.50 +59 25 26.7           ~ 67 0
24 GRB 140423A gB 13 09 06.20 +49 50 18.3           ~ 61 0
25 GRB 110920 gB 13 59 16.8 -27 33 36           ~ 11 0
26 GRB 130606B gB 14 34 07.04 -22 06 08.2           ~ 23 0
27 GRB 091003A gB 16 46 04.680 +36 37 31.08           ~ 100 0
28 GRB 090902B gB 17 39 45.26 +27 19 28.1           ~ 320 0
29 GRB 151027A gB 18 09 56.86 +61 21 11.9           ~ 66 0
30 GRB 110731A gB 18 42 00.99 -28 32 13.8           ~ 117 0
31 GRB 140512A gB 19 17 28.81 -15 05 39.5           ~ 63 0
32 GRB 090618 gB 19 36 01.80 +78 21 07.1           ~ 264 0
33 GRB 150403A gB 20 46 01.17 -62 42 40.4           ~ 46 0
34 GRB 160509A gB 20 47 00.90 +76 06 30.1           ~ 55 0
35 GRB 120716A gB 20 52 12.17 +09 35 53.9           ~ 44 0
36 GRB 141028A gB 21 30 24.48 -00 13 55.3           ~ 58 0
37 GRB 150821A gB 22 47 39.13 -57 53 38.1           ~ 28 0
38 GRB 090926A gB 23 33 36.18 -66 19 25.9           ~ 249 0
39 GRB 130518A gB 23 42 39.79 +47 27 55.2           ~ 46 0

    Equat.    Gal    SGal    Ecl

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2020.03.28-22:54:29

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