2017ApJ...847...85Y


Query : 2017ApJ...847...85Y

2017ApJ...847...85Y - Astrophys. J., 847, 85-85 (2017/October-1)

X-ray and radio observations of the magnetar SGR J1935+2154 during its 2014, 2015, and 2016 outbursts.

YOUNES G., KOUVELIOTOU C., JAODAND A., BARING M.G., VAN DER HORST A.J., HARDING A.K., HESSELS J.W.T., GEHRELS N., GILL R., HUPPENKOTHEN D., GRANOT J., GOGUS E. and LIN L.

Abstract (from CDS):

We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail, with a PL photon index Γ = 0.9, extending up to 50 keV, with flux comparable to the one detected <10 keV. Imaging analysis of Chandra data did not reveal small-scale extended emission around the source. Following the outbursts, the total 0.5-10 keV flux from SGR J1935+2154 increased in concordance to its bursting activity, with the flux at activation onset increasing by a factor of ∼7 following its strongest 2016 June outburst. A Swift/X-Ray Telescope observation taken 1.5 days prior to the onset of this outburst showed a flux level consistent with quiescence. We show that the flux increase is due to the PL or hot BB component, which increased by a factor of 25 compared to quiescence, while the cold BB component kT = 0.47 keV remained more or less constant. The 2014 and 2015 outbursts decayed quasi-exponentially with timescales of ∼40 days, while the stronger 2016 May and June outbursts showed a quick short-term decay with timescales of about four days. Our Arecibo radio observations set the deepest limits on the radio emission from a magnetar, with a maximum flux density limit of 14 µJy for the 4.6 GHz observations and 7 µJy for the 1.4 GHz observations. We discuss these results in the framework of the current magnetar theoretical models.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): radio continuum: stars - stars: individual: SGR J1935+2154 - stars: magnetars - stars: neutron - X-rays: stars - X-rays: stars

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9860 1
2 NAME Sgr J0418+5729 gam 04 18 33.867 +57 32 22.91           ~ 195 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15470 1
4 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4908 1
5 PSR J1119-6127 Psr 11 19 14.30 -61 27 49.5           ~ 352 1
6 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 356 1
7 AJG 44 Psr 16 17 33.000 -51 02 00.00           ~ 471 3
8 GRB 980618A gB 16 35 52 -47 35.2           ~ 244 0
9 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 182 1
10 1WGA J1822.2-1604 X 18 22 18.32 -16 04 27.2           ~ 115 0
11 SWIFT J1834.9-0846 N*? 18 34 52.768 -08 45 40.83           ~ 66 0
12 PSR J1846-0258 Psr 18 46 24.94 -02 58 30.1           ~ 314 2
13 PSR B1919+21 Psr 19 21 44.815 +21 53 02.25           ~ 355 0
14 PSR J1924+1631 Psr 19 24 55 +16 31.8           ~ 4 0
15 NAME Sgr 1935+2154 * 19 34 55.68 +21 53 48.2           ~ 232 1
16 SNR G057.2+00.8 SNR 19 35.0 +21 57           ~ 77 0

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2021.08.03-11:43:35

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