J/ApJ/911/92 Multiwavelength study for 4FGL J0336.0+7502 (Li+, 2021)
Revealing a new black widow binary 4FGL J0336.0+7502.
Li K.-L., Jane Yap Y.X., Hui C.Y., Kong A.K.H.
<Astrophys. J., 911, 92 (2021)>
=2021ApJ...911...92L 2021ApJ...911...92L
ADC_Keywords: Pulsars; Binaries, X-ray; Gamma rays; Photometry, VRI
Keywords: High energy astrophysics ; Gamma-ray sources ;
Compact binary stars ; Millisecond pulsars ; X-ray sources
Abstract:
We 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 Porb=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 Γx=1.6±0.7 and
F0.3-7keV=3.5-1.0+1.2x10-14erg/cm2/s. The X-ray photon index
and the low X-ray-to-γ-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 (1.3σ). 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.
Description:
In this paper, we present a multiwavelength study for
4FGLJ0336.0+7502, which is a new black widow millisecond pulsar binary
(BW MSP) candidate identified by our unidentified Fermi-LAT sources
observing campaign.
The observations include:
(i) the Fermi-LAT γ-ray properties of 4FGL J0336.0+7502,
see Section 2;
(ii) optical photometric observations taken by the Bohyunsan 1.8m
Telescope on 2019 March 31,
the Lulin One-meter Telescope (LOT) on 2019 October 17/18,
2019 November 10, and 2020 January 8/9,
the Canada-France-Hawaii Telescope (CFHT) on 2017 January 25
and February 2, and
a 4hr series of Gemini-North photometric observations
(PI: Kwan-Lok Li) on 2019 November 28.
See section 3;
(iii) four archival Swift/X-Ray Telescope (XRT) observations taken
between 2012 April 14 and 18 and
an observation taken on 2020 January 25 with Chandra/ACIS-S;
see Section 4.
Objects:
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RA (ICRS) DE Designation(s)
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03 36 06.0 +75 03 00 4FGL J0336.0+7502 = 1FGL J0334.2+7501
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig3.dat 37 166 Optical light curves of 4FGL J0336.0+7502
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See also:
J/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)
Byte-by-byte Description of file: fig3.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD Barycentric Julian Date of observation
18- 23 F6.3 mag omag [20.07/25.49] Observed magnitude
25- 29 F5.3 mag e_omag [0.004/1.4] Uncertainty in omag
31- 35 A5 --- Inst Instrument (1)
37 A1 --- Filt [gri] Filter
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Note (1): Instrument as follows:
BOAO = the 1.8m telescope at the Bohyunsan Optical Astronomy Observatory
(11 occurrences)
CFHT = the Canada-France-Hawaii Telescope with MegaCam on Maunakea
(10 occurrences)
GMOSN = The Frederick C. Gillett Gemini Telescope using GMOS-N
(74 occurrences)
LOT = Lulin 1m Telescope at Lulin Observatory (71 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Oct-2022