J/ApJ/902/L46 Gravitational-wave freq. limits for PSRJ1653-0158 (Nieder+, 2020)
Discovery of a gamma-ray black widow pulsar by GPU-accelerated
Nieder L., Clark C.J., Kandel D., Romani R.W., Bassa C.G., Allen B.,
Ashok A., Cognard I., Fehrmann H., Freire P., Karuppusamy R., Kramer M.,
Li D., Machenschalk B., Pan Z., Papa M.A., Ransom S.M., Ray P.S., Roy J.,
Wang P., Wu J., Aulbert C., Barr E.D., Beheshtipour B., Behnke O.,
Bhattacharyya B., Breton R.P., Camilo F., Choquet C., Dhillon V.S.,
Ferrara E.C., Guillemot L., Hessels J.W.T., Kerr M., Kwang S.A., Marsh T.R.,
Mickaliger M.B., Pleunis Z., Pletsch H.J., Roberts M.S.E., Sanpa-arsa S.,
Steltner B.
<Astrophys. J., 902, L46 (2020)>
=2020ApJ...902L..46N 2020ApJ...902L..46N
ADC_Keywords: Pulsars; Gamma rays
Keywords: Gamma-ray sources ; Millisecond pulsars ; Neutron stars ;
Binary pulsars
Abstract:
We report the discovery of 1.97ms period gamma-ray pulsations from the
75 minute orbital-period binary pulsar now named PSRJ1653-0158. The
associated Fermi Large Area Telescope gamma-ray source
4FGLJ1653.6-0158 has long been expected to harbor a binary millisecond
pulsar. Despite the pulsar-like gamma-ray spectrum and candidate
optical/X-ray associations-whose periodic brightness modulations
suggested an orbit-no radio pulsations had been found in many
searches. The pulsar was discovered by directly searching the
gamma-ray data using the GPU-accelerated Einstein@Home distributed
volunteer computing system (Allen+ 2013ApJ...773...91A 2013ApJ...773...91A). The
multidimensional parameter space was bounded by positional and orbital
constraints obtained from the optical counterpart. More sensitive
analyses of archival and new radio data using knowledge of the pulsar
timing solution yield very stringent upper limits on radio emission.
Any radio emission is thus either exceptionally weak, or eclipsed for
a large fraction of the time. The pulsar has one of the three lowest
inferred surface magnetic-field strengths of any known pulsar with
Bsurf∼4x107G. The resulting mass function, combined with models of
the companion star's optical light curve and spectra, suggests a
pulsar mass ≳2M☉. The companion is lightweight with mass
∼0.01M☉, and the orbital period is the shortest known for any
rotation-powered binary pulsar. This discovery demonstrates the Fermi
Large Area Telescope's potential to discover extreme pulsars that
would otherwise remain undetected.
Description:
We searched for gamma-ray pulsations in the arrival times of photons
observed by the Fermi-LAT between 2008-Aug-03 and 2018-Apr-16
(MJDs 54681 and 58224). The data set used here consisted of
N=354009 photons, collected over a period of 3542 days. Following the
pulsar discovery, we extended this data set to 2020-Feb-23 (MJD58902).
See Section 2.
Objects:
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RA (ICRS) DE Designation(s)
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16 53 38.05 -01 58 36.9 PSRJ1653-0158 = PSR J1653-0158
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig4.dat 23 204 *Upper limits on h095% in each of the 10mHz bands
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Note on fig4.dat: Acknowledging the possibility of mismatches between the
pulsar rotation frequency and the gravitational-wave frequency, we
perform an F-statistic search in a ∼2Hz band around twice the rotation
frequency, a factor of 10-3 of the gravitational-wave frequency,
similarly to what was done in Abbott+ (2019PhRvD..99l2002A 2019PhRvD..99l2002A) and also
extend the spin-down search to the range
2fdot.in(-1.260,-1.2216)x10-15Hz/s. Overall, we use 2.4x109
templates resulting in an average mismatch of 1%. We examine the
results in 10mHz-wide bands. See Appendix.
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See also:
B/psr : ATNF Pulsar Catalogue (Manchester+, 2005)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)
J/ApJS/183/46 : Fermi/LAT bright gamma-ray source list (0FGL) (Abdo+, 2009)
J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013)
J/ApJ/769/108 : Optical photometry of 4 millisecond pulsars (Breton+, 2013)
J/ApJ/814/128 : Timing noise & astrometry of Fermi-LAT pulsars (Kerr+, 2015)
J/ApJ/820/8 : 3FGL sources statistical classifications (Saz Parkinson+, 2016)
J/ApJ/879/10 : 2015-2017 LIGO obs. analysis for 221 pulsars (Abbott+, 2019)
J/ApJ/872/42 : Opt. sp. of redback ms pulsar binaries (Strader+, 2019)
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 Hz nu [1015.4/1017.5] Start frequency of 10mHz band
10- 13 F4.2 10-25 h095 [1.19/2.2] h095% upper limit
15- 18 F4.2 10-25 E_h095 [0.2/0.43] Upper uncertainty on h095
20- 23 F4.2 10-25 e_h095 [0.21/0.44] Lower uncertainty on h095
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Apr-2022