2015ApJ...805...89L


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.09CEST16:57:05

2015ApJ...805...89L - Astrophys. J., 805, 89 (2015/June-1)

The millisecond magnetar central engine in short GRBs.

LU H.-J., ZHANG B., LEI W.-H., LI Y. and LASKY P.D.

Abstract (from CDS):

One favored progenitor model for short duration gamma-ray bursts (GRBs) is the coalescence of two neutron stars (NS-NS). One possible outcome of such a merger would be a rapidly spinning, strongly magnetized neutron star (known as a millisecond magnetar). These magnetars may be ''supra-massive,'' implying that they would collapse to black holes after losing centrifugal support due to magnetic dipole spin down. By systematically analyzing the Burst Alert Telescope (BAT)-XRT light curves of all short GRBs detected by Swift, we test how consistent the data are with this central engine model of short GRBs. We find that the so-called ''extended emission'' feature observed with BAT in some short GRBs is fundamentally the same component as the ''internal X-ray plateau'' observed in many short GRBs, which is defined as a plateau in the light curve followed by a very rapid decay. Based on how likely a short GRB is to host a magnetar, we characterize the entire Swift short GRB sample into three categories: the ''internal plateau'' sample, the ''external plateau'' sample, and the ''no plateau'' sample. Based on the dipole spin-down model, we derive the physical parameters of the putative magnetars and check whether these parameters are consistent with expectations from the magnetar central engine model. The derived magnetar surface magnetic field Βp and the initial spin period P0 fall into a reasonable range. No GRBs in the internal plateau sample have a total energy exceeding the maximum energy budget of a millisecond magnetar. Assuming that the beginning of the rapid fall phase at the end of the internal plateau is the collapse time of a supra-massive magnetar to a black hole, and applying the measured mass distribution of NS-NS systems in our Galaxy, we constrain the neutron star equation of state (EOS). The data suggest that the NS EOS is close to the GM1 model, which has a maximum non-rotating NS mass of MTOV ∼ 2.37 M.

Abstract Copyright:

Journal keyword(s): gamma rays: general - methods: statistical - radiation mechanisms: non-thermal

Status at CDS:  

Simbad objects: 32

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Number of rows : 32

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 100117A gB 00 45 04.56 -01 35 41.7           ~ 104 0
2 GRB 100625A gB 01 03 10.98 -39 05 18.3           ~ 71 0
3 GRB 080426 gB 01 45 59.79 +69 28 06.0           ~ 33 0
4 GRB 070724A gB 01 51 14.08 -18 35 38.8           ~ 140 0
5 GRB 081024 gB 01 51 33.80 +61 21 08.2           ~ 55 0
6 GRB 070714A gB 02 51 43.36 +30 14 35.1           ~ 46 0
7 GRB 120305A gB 03 10 08.73 +28 29 30.9           ~ 30 0
8 GRB 130912A gB 03 10 25.60 +13 59 55.7           ~ 29 0
9 GRB 070714B gB 03 51 22.30 +28 17 51.3           ~ 164 1
10 GRB 071227 gB 03 52 31.09 -55 59 03.3           ~ 141 0
11 GRB 060313 gB 04 26 28.180 -10 50 37.95 20.55 21.03 19.66     ~ 128 0
12 GRB 101219A gB 04 58 20.43 -02 32 23.0           ~ 96 0
13 GRB 061006 gB 07 24 07.660 -79 11 55.10           ~ 157 1
14 GRB 051227 gB 08 20 58.107 +31 55 32.01           ~ 111 0
15 GRB 120521A gB 09 54 53.91 -49 25 02.4           ~ 24 0
16 GRB 111121A gB 10 19 02.632 -46 40 11.13   13.795 12.458     ~ 33 0
17 GRB 090515 gB 10 56 41.0 +14 27 22           ~ 80 0
18 GRB 130603B gB 11 28 48.16 +17 04 18.2           ~ 254 0
19 GRB 090426 gB 12 36 19.49 +32 59 05.5           ~ 151 0
20 GRB 100724A gB 12 58 10.37 -11 06 09.3           ~ 49 0
21 GRB 070809 gB 13 35 04.2 -22 07 07           ~ 104 0
22 GRB 060801 gB 14 12 01.290 +16 58 54.00           ~ 132 0
23 GRB 100702A gB 16 22 47.26 -56 31 53.8           ~ 33 0
24 GRB 050724 gB 16 24 44.400 -27 32 27.90     19.70     ~ 378 1
25 GRB 080919 gB 17 40 53.00 -42 22 29.5           ~ 31 0
26 GRB 080905A gB 19 10 39.10 -18 51 55.4           ~ 131 0
27 GRB 080702A gB 20 52 12.21 +72 18 46.7           ~ 33 0
28 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 494 1
29 GRB 051221 gB 21 54 48.626 +16 53 27.16 19.49         ~ 299 1
30 GRB 051210 gB 22 00 40.930 -57 36 47.10           ~ 107 0
31 GRB 061201 gB 22 08 32.060 -74 34 47.90           ~ 150 0
32 GRB 090510 gB 22 14 12.60 -26 35 51.1           ~ 399 1

    Equat.    Gal    SGal    Ecl

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2020.04.09-16:57:05

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