期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 738, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/738/2/L31
关键词
X-rays: binaries; X-rays: individual (1FGL J1018.6-5856)
资金
- Formosa Program [TW2010005]
- Ramon y Cajal Fellowship
- National Natural Science Foundation of China [NSFC-10325313, 10521001, 10733010, 11073021, 10821061]
- CAS [KJCX2-YW-T03]
- 973 program [2009CB824800]
- [AYA2009-07391]
- [SGR2009-811]
- ICREA Funding Source: Custom
The Fermi Large Area telescope (Fermi-LAT) collaboration has recently reported that one of their detected sources, namely, 1FGL J1018.6-5856, is a new gamma-ray binary similar to LS 5039. This has prompted efforts to study its multi-frequency behavior. In this report, we present the results from 5.78 Ms International Gamma-Ray Astrophysics Laboratory (INTEGRAL) IBIS/ISGRI observations on the source 1FGL J1018.6-5856. By combining all the available INTEGRAL data, a detection is made at a significance level of 5.4 sigma in the 18-40 keV band, with an average intensity of 0.074 counts s(-1). However, we find that there is non-statistical noise in the image that effectively reduces the significance to about 4 sigma and a significant part of the signal appears to be located in a 0.2-wide phase region, at phases 0.4-0.6 (where even the corrected significance amounts to 90% of the total signal found). Given the scarcity of counts, a variability is hinted at about 3 sigma at the hard X-rays, with an anticorrelation with the Fermi-LAT periodicity. If this behavior were true, it would be similar to that found in LS 5039 and prompt observations with TeV telescopes at phases anticorrelated with the GeV maximum.
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