Discovery of an ultracompact gamma-ray millisecond pulsar binary candidate

We report multi-wavelength observations of the unidentified Fermi object 2FGL J1653.6-0159. With the help of high-resolution X-ray observation, we have identified an X-ray and optical counterpart of 2FGL J1653.6-0159. The source exhibits a periodic modulation of 75 min in optical and possibly also i...

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Published in:arXiv.org 2014-09
Main Authors: Kong, A K H, Jin, R, T -C Yen, Hu, C P, Hui, C Y, Tam, P H T, Takata, J, Lin, L C C, Cheng, K S, Park, S M, Kim, C L
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Language:English
Subjects:
Binary stars
Companion stars
Gamma rays
Millisecond pulsars
Optical counterparts (astronomy)
Orbits
Pulsation
X-rays
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creator Kong, A K H
Jin, R
T -C Yen
Hu, C P
Hui, C Y
Tam, P H T
Takata, J
Lin, L C C
Cheng, K S
Park, S M
Kim, C L
description We report multi-wavelength observations of the unidentified Fermi object 2FGL J1653.6-0159. With the help of high-resolution X-ray observation, we have identified an X-ray and optical counterpart of 2FGL J1653.6-0159. The source exhibits a periodic modulation of 75 min in optical and possibly also in X-ray. We suggest that 2FGL J1653.6-0159 is a compact binary system with an orbital period of 75 min. Combining the gamma-ray and X-ray properties, 2FGL J1653.6-0159 is potentially a black widow/redback type gamma-ray millisecond pulsar (MSP). The optical and X-ray lightcurve profiles show that the companion is mildly heated by the high-energy emission and the X-rays are from intrabinary shock. Although no radio pulsation has been detected yet, we estimated that the spin period of the MSP is ~2ms based on a theoretical model. If pulsation can be confirmed in the future, 2FGL J1653.6-0159 will become the first ultracompact rotation-powered MSP.
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subjects Binary stars
Companion stars
Gamma rays
Millisecond pulsars
Optical counterparts (astronomy)
Orbits
Pulsation
X-rays
title Discovery of an ultracompact gamma-ray millisecond pulsar binary candidate
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