2018A&A...619A..26M


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET23:54:22

2018A&A...619A..26M - Astronomy and Astrophysics, volume 619A, 26-26 (2018/11-1)

Refining the origins of the gamma-ray binary 1FGL J1018.6-5856.

MARCOTE B., RIBO M., PAREDES J.M., MAO M.Y. and EDWARDS P.G.

Abstract (from CDS):


Context. Gamma-ray binaries are systems composed of a massive star and a compact object that exhibit emission from radio to very high energy gamma rays. They are ideal laboratories to study particle acceleration and a variety of physical processes that vary as a function of the orbital phase.
Aims. We aim to study the radio emission of the gamma-ray binary 1FGL J1018.6-5856 to constrain the emitting region and determine the peculiar motion of the system within the Galaxy to clarify its origin.
Methods. We analyzed an observation of 1FGL J1018.6-5856 with the Australian Long Baseline Array (LBA) at 8.4GHz to obtain an accurate astrometry of the system and study its emission on milliarcsecond scales. We combined these data with the optical Gaia DR2 and UCAC4 catalogs to consolidate the astrometry information therein.
Results. The gamma-ray binary 1FGL J1018.6-5856 shows compact radio emission (<3mas or ≤20 au at ∼6.4kpc distance), implying a brightness temperature of ≥5.6x106K, and confirming its nonthermal origin. We report consistent results between the proper motion reported by Gaia DR2 and the positions obtained from the Gaia DR2, UCAC4, and LBA data (spanning 20 yr in total). We also determined the distance to 1FGL J1018.6-5856 to be 6.4–0.7+1.7kpc. Together with the radial velocity of the source we computed its three-dimensional (3D) proper and peculiar motion within the Galaxy. We obtained a peculiar motion of 1FGL J1018.6-5856 on its regional standard of rest (RSR) frame of |u|=45–9+30km/s, with the system moving away from the Galactic plane. In the simplest scenario of a symmetric stellar core collapse we estimate a mass loss of 4≤ΔM≤9M during the creation of the compact object.
Conclusions. 1FGL J1018.6-5856 exhibits compact radio emission similar to that detected in other gamma-ray binaries. We provide the first accurate peculiar motion estimations of the system and place it within the Galaxy. The obtained motion and distance excludes the physical relation of the binary source with the supernova remnant (SNR) G284.3-1.8.

Abstract Copyright: © ESO 2018

Journal keyword(s): binaries: close - gamma rays: stars - radio continuum: stars - radiation mechanisms: non-thermal - stars: individual: 1FGL J1018.6-5856 - instrumentation: interferometers

Simbad objects: 15

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Number of rows : 15

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 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 753 2
2 CXOU J053600.0-673507 X 05 36 00.01 -67 35 07.5           ~ 15 0
3 HD 259440 HXB 06 32 59.2566624297 +05 48 01.162565528 9.17 9.58 9.12     B0pe 181 0
4 NAME Car Arm PoG 10 00 -60.0           ~ 371 1
5 PSR J1016-58 Psr 10 16 21.266 -58 57 11.70           ~ 82 3
6 SNR G284.3-01.8 Rad 10 18.3 -59 00           ~ 100 2
7 3FHL J1018.8-5857 HXB 10 19 02.270 -58 56 29.87           ~ 89 0
8 PMN J1019-6047 Rad 10 19 53.3 -60 47 50           ~ 3 1
9 QSO B1057-797 BLL 10 58 43.30977041 -80 03 54.1597166   19.08   17.31   ~ 148 0
10 CPD-63 2495 HXB 13 02 47.6541729595 -63 50 08.625922862 10.34 10.72 9.98 10.03   O9.5Ve 661 1
11 NAME Nor Arm PoG 16 00 -50.0           ~ 327 0
12 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11178 0
13 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 487 2
14 [MT91] 213 Be* 20 32 13.1248987067 +41 27 24.343749507 13.12 13.08 11.266     B0Vp 203 0
15 NAME Local Arm reg ~ ~           ~ 352 0

    Equat.    Gal    SGal    Ecl

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2020.01.25-23:54:22

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