J/ApJ/911/92ivo://CDS.VizieR/J/ApJ/911/92doi:10.26093/cds/vizier.19110092CDSLi K.-L.Jane Yap Y.X.Hui C.Y.Kong A.K.H.2022-11-16T06:33:28Z2022-11-09T11:53:10ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frpulsarsx-ray-binary-starsgamma-ray-astronomyinfrared-photometryvisible-astronomyphotometryWe report on the discovery of a promising candidate for a black widow (BW) millisecond pulsar binary, 4FGL J0336.0+7502, which shows many pulsar-like properties in the 4FGL-DR2 catalog. Within the 95% error region of the LAT source, we identified an optical counterpart with a clear periodicity at P_orb_=3.718178(9)hr using the Bohyunsan 1.8m Telescope, the Lulin One-meter Telescope, the Canada-France-Hawaii Telescope, and Gemini-North. At the optical position, an X-ray source was marginally detected in the Swift/X-Ray Telescope archival data, and the detection was confirmed by our Chandra/ACIS DDT observation. The spectrum of the X-ray source can be described by a power- law model of {Gamma}_x_=1.6+/-0.7 and F_0.3-7keV_=3.5_-1.0_^+1.2^x10^-14^erg/cm^2^/s. The X-ray photon index and the low X-ray-to-{gamma}-ray flux ratio (i.e., <1%) are both consistent with that of many known BW pulsars. There is also a hint of an X-ray orbital modulation in the Chandra data, although the significance is very low (1.3{sigma}). If the pulsar identity and the X-ray modulation are confirmed, it would be the fifth BW millisecond pulsar binary that showed an orbitally modulated emission in X-rays.2021ApJ...911...92Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/911/92CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/ApJ/820/8 : 3FGL sources statistical classif. (Saz Parkinson+, 2016)J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)J/ApJ/904/49 : 4FGLJ0407.7-5702 optical spectroscopy & LC (Miller+, 2020)J/ApJ/902/L46 : Gravitational-wave limits for PSRJ1653-0158 (Nieder+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/911/92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/911/92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/911/92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/911/92https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/911/92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/911/92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapGamma-rayOpticalInfraredRadiodefaultJ/ApJ/911/92/fig3Optical light curves of 4FGL J0336.0+7502recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of observationdtime.epochdoubleomag[20.07/25.49] Observed magnitudemagphot.magfloate_omag[0.004/1.4] Uncertainty in omagmagstat.error;phot.magfloatInstInstrument (1)meta.id;instrcharFilt[gri] Filtermeta.id;instr.filterchar