2013A&A...555A.102W


Query : 2013A&A...555A.102W

2013A&A...555A.102W - Astronomy and Astrophysics, volume 555A, 102-102 (2013/7-1)

Fermi-LAT upper limits on gamma-ray emission from colliding wind binaries.

WERNER M., REIMER O., REIMER A. and EGBERTS K.

Abstract (from CDS):

Colliding wind binaries (CWBs) are thought to give rise to a plethora of physical processes including acceleration and interaction of relativistic particles. Observation of synchrotron radiation in the radio band confirms there is a relativistic electron population in CWBs. Accordingly, CWBs have been suspected sources of high-energy γ-ray emission since the COS-B era. Theoretical models exist that characterize the underlying physical processes leading to particle acceleration and quantitatively predict the non-thermal energy emission observable at Earth. We strive to find evidence of γ-ray emission from a sample of seven CWB systems: WR 11, WR 70, WR 125, WR 137, WR 140, WR 146, and WR 147. Theoretical modelling identified these systems as the most favourable candidates for emitting γ-rays. We make a comparison with existing γ-ray flux predictions and investigate possible constraints. We used 24 months of data from the Large Area Telescope (LAT) on-board the Fermi Gamma Ray Space Telescope to perform a dedicated likelihood analysis of CWBs in the LAT energy range. We find no evidence of γ-ray emission from any of the studied CWB systems and determine corresponding flux upper limits. For some CWBs the interplay of orbital and stellar parameters renders the Fermi -LAT data not sensitive enough to constrain the parameter space of the emission models. In the cases of WR140 and WR147, the Fermi -LAT upper limits appear to rule out some model predictions entirely and constrain theoretical models over a significant parameter space. A comparison of our findings to the CWB η Car is made.

Abstract Copyright:

Journal keyword(s): gamma rays: stars - stars: massive - binaries: general

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 - 2022
#notes
1 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 867 0
2 NAME Vela X Psr 08 33 08.880 -45 11 24.36           ~ 258 1
3 3A 1510-590 Psr 15 13 17.000 -59 04 54.00           ~ 387 3
4 HD 137603 WR* 15 29 44.6912765040 -58 34 51.250066032 10.98 10.95 9.71 9.78   WC9+OB 106 0
5 HD 318016 WR* 17 37 13.7436747168 -33 27 56.013254280 13.71 13.16 11.81 11.42   WN8/WC7 77 0
6 EM* AS 268 WR* 18 02 23.4574037952 -23 34 37.491692196   14.38 12.31 11.43   WN9h 99 0
7 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 258 0
8 MR 93 WR* 19 28 15.6142522320 +19 33 21.527693100   14.83       WC7+O9(III) 104 0
9 HD 192641 WR* 20 14 31.7666855880 +36 39 39.598210224 7.80 8.20 7.91     WC7pd+O9V 317 0
10 HD 193793 WR* 20 20 27.9757908696 +43 51 16.286840244 6.90 7.25 6.85 4.58   WC7p+O5 678 1
11 3EG J2022+4317 gam 20 22 +43.3           ~ 20 0
12 NAME Cyg Complex reg 20 32 +45.0           ~ 553 0
13 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC6+O8I-IIf 149 1
14 EM* AS 431 WR* 20 36 43.6322747712 +40 21 07.442607924     13.73 12.51   WN8(h)+B0.5V 215 0
15 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 867 0

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2022.05.24-12:03:14

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