2011A&A...533L...7M


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.19CEST05:00:16

2011A&A...533L...7M - Astronomy and Astrophysics, volume 533, L7-7 (2011/9-1)

Revealing the extended radio emission from the gamma-ray binary HESS J0632+057.

MOLDON J., RIBO M. and PAREDES J.M.

Abstract (from CDS):

After the detection of a 321-day periodicity in X-rays, HESS J0632+057 can be robustly considered a new member of the selected group of gamma-ray binaries. These sources are known to show extended radio structure on scales of milliarcseconds (mas). We present the expected extended radio emission on mas scales from HESS J0632+057. We observed HESS J0632+057 with the European VLBI Network (EVN) at 1.6GHz in two epochs: during the January/February 2011 X-ray outburst and 30 days later. The VLBI image obtained during the outburst shows a compact ∼0.4mJy radio source, whereas 30 days later the source has faded and appears extended, with a projected size of ∼75AU. The peak of the emission is displaced between runs 21±5AU, which is bigger than the orbit size. The position of the radio source is compatible with the Be star MWC 148, which sets the proper motion of the binary system below 3 mas/yr in each coordinate. The brightness temperature of the source is above 2x106K. We compare the multiwavelength properties of HESS J0632+057 with those of the previously known gamma-ray binaries. HESS J0632+057 displays extended and variable non-thermal radio emission. Its morphology, size, and displacement on AU scales are similar to those found in the other gamma-ray binaries, PSR B1259-63, LS 5039, and LS I +61 303, supporting a similar nature for HESS J0632+057.

Abstract Copyright:

Journal keyword(s): radio continuum: stars - X-rays: binaries - stars: emission-line, Be - gamma rays: stars - stars: individual: MWC148

Simbad objects: 12

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Number of rows : 12

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 763 2
2 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 884 1
3 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1274 1
4 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 468 2
5 ICRF J061909.9+073641 QSO 06 19 09.9710586 +07 36 41.220460   21.0 20.5     ~ 11 1
6 HD 259440 HXB 06 32 59.2566624297 +05 48 01.162565528 9.17 9.58 9.12     B0pe 188 0
7 3FHL J1018.8-5857 HXB 10 19 02.270 -58 56 29.87           ~ 93 0
8 CPD-63 2495 HXB 13 02 47.6541729595 -63 50 08.625922862 10.34 10.72 9.98 10.03   O9.5Ve 677 1
9 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 683 2
10 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 494 2
11 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2302 0
12 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1771 2

    Equat.    Gal    SGal    Ecl

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2020.09.19-05:00:16

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