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A compact X-ray emitting binary in likely association with 4FGL J0935.3+0901

Wang, Zhongxiang and Xing, Yi and Zhang, Jujia and Boutsia, Konstantina and Wang, Gege and V, Jithesh and Burdge, Kevin B. and Coughlin, Michael W. and Duev, Dmitry A. and Kulkarni, S. R. and Riddle, Reed and Serabyn, Eugene (2020) A compact X-ray emitting binary in likely association with 4FGL J0935.3+0901. Monthly Notices of the Royal Astronomical Society, 493 (4). pp. 4845-4851. ISSN 0035-8711.

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4FGL J0935.3+0901 is a γ-ray source detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope. We have conducted detailed analysis of the LAT data for this source and multiwavelength studies of the source field. Its γ-ray emission can be described with a power law (Γ = 2.0 ± 0.2) with an exponential cut-off (E_c = 2.9 ± 1.6 GeV), while the flux shows significant long-term variations. From analysis of archival Neil Gehrels Swift Observatory X-Ray Telescope data, we find only one X-ray source in the LAT’s 2σ error region. Within a 3.7arcsec radius error circle of the X-ray source, there is only one optical object down to r′ ∼ 23 mag. Time-resolved photometry of the optical object indicates a likely 2.5 h periodic modulation, while its spectrum shows double-peaked hydrogen and helium emission lines (similar to those seen in accretion discs in low-mass X-ray binaries). Combining these results, we conclude that we have discovered a compact X-ray emitting binary in likely association with 4FGL J0935.3+0901, i.e. a millisecond pulsar (MSP) binary. We discuss the implication of the optical spectral features: this binary could be a transitional MSP system at a subluminous disc state, although the other possibility, the binary in a rotation-powered state showing the optical emission lines due to intrabinary interaction processes, cannot be excluded. Further observational studies will help to determine detailed properties of this candidate MSP binary and thus clarify its current state.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Burdge, Kevin B.0000-0002-7226-836X
Coughlin, Michael W.0000-0002-8262-2924
Duev, Dmitry A.0000-0001-5060-8733
Kulkarni, S. R.0000-0001-5390-8563
Riddle, Reed0000-0002-0387-370X
Additional Information:© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 March 3. Received 2020 March 2; in original form 2020 January 7. Published: 09 March 2020. This paper includes data gathered with the 6.5-m Magellan telescopes located at Las Campanas Observatory, Chile. This research made use of the High Performance Computing Resource in the Core Facility for Advanced Research Computing at Shanghai Astronomical Observatory. This research was supported by the National Program on Key Research and Development Project (Grant No. 2016YFA0400804) and the National Natural Science Foundation of China (11633007, U1738131). JZ is supported by the NSFC (grants 11773067, 11403096), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (grants 2018081), and the Western Light Youth Project.
Group:Astronomy Department
Funding AgencyGrant Number
National Key Research and Development Program of China2016YFA0400804
National Natural Science Foundation of China11633007
National Natural Science Foundation of ChinaU1738131
National Natural Science Foundation of China11773067
National Natural Science Foundation of China11403096
Chinese Academy of Sciences2018081
Western Light Youth ProjectUNSPECIFIED
Subject Keywords:stars: neutron – pulsars: general – gamma-rays: stars –X-rays: binaries
Issue or Number:4
Record Number:CaltechAUTHORS:20200415-071716118
Persistent URL:
Official Citation:Zhongxiang Wang, Yi Xing, Jujia Zhang, Konstantina Boutsia, Gege Wang, Jithesh V, Kevin B Burdge, Michael W Coughlin, Dmitry A Duev, S R Kulkarni, Reed Riddle, Eugene Serabyn, A compact X-ray emitting binary in likely association with 4FGL J0935.3+0901, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 4, April 2020, Pages 4845–4851,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102542
Deposited By: Tony Diaz
Deposited On:15 Apr 2020 16:08
Last Modified:15 Apr 2020 16:08

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