HAWC detection of TeV source HAWC J0635+070
ATel #12013; Chad Brisbois (Michigan Technological University), Colas Riviere (University of Maryland), Henrike Fleischhack (Michigan Technological University), Andrew Smith (University of Maryland) on behalf of the HAWC collaboration
on 6 Sep 2018; 14:47 UT
Credential Certification: Colas Riviere (riviere@umd.edu)
Subjects: Gamma Ray, TeV, VHE, Pulsar
The High Altitude Water Cherenkov (HAWC) collaboration reports the
discovery of a new TeV gamma-ray source HAWC J0635+070.
It was discovered in a search for extended sources covering 1128 days of HAWC
observations with a test statistic value of 27 (>5σ pre-trials), following the
method presented in [Abeysekara et al. 2017, ApJ, 843, 40].
Its significance in the 2HWC data set excluded it from being included in the
catalog (~3.5σ pre-trials), but with the addition of ~600 more days of data it
now satisfies that criterion.
The best-fit J2000.0 equatorial position is RA=98.71±0.20°, Dec=7.00±0.22°, with
a Gaussian 1-sigma extent of 0.65°±0.18°.
The spectral energy distribution is well-fit by a power law with spectral index
-2.15±0.17.
The differential flux at 10 TeV is (8.6 ± 3.2) × 10^-15 TeV-1 cm-2 s-1.
All errors are statistical only; further morphological and spectral analysis as
well as studies of the systematic uncertainty are ongoing.
Given its spectrum and morphology, we believe HAWC J0635+070 may be the TeV halo
of the pulsar PSR J0633+0632 (Edot = 1.2e+35 erg s-1, dist = 1.35 kpc,
age = 59 kyr, unknown proper motion [Manchester et al., 2005, AJ, 129]).
The gamma-ray spectrum and morphology is compatible with a "Geminga-like" TeV
Halo [Abeysekara et al. 2017, Science, 358, 911; Linden et al., 2017, PRD, 96, 103016].
We encourage follow-up observations at other wavelengths.
