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Observation Date (UT) Observation Lat

Canonical Name:2HWC J1852+013*
TeVCat Name:TeV J1852+013
Other Names:3HWC J1852+013
HESS J1854+013
Source Type:UNID
R.A.:18 52 02.4 (hh mm ss)
Dec.:+01 22 48 (dd mm ss)
Gal Long: 34.23 (deg)
Gal Lat: 0.50 (deg)
Distance:
Flux: (Crab Units)
Energy Threshold: GeV
Spectral Index:2.9
Extended:No
Discovery Date:2017-02
Discovered By: HAWC
TeVCat SubCat:Default Catalog

Source Notes:

Source Position:

From Abeysekara et al. (2017):
- R.A. (J2000): 283.01 deg (= 18h 52m 02.4s)
- Dec. (J2000): +1.38 deg (= +01d 22' 48")
- the statistical uncertainty on the position is 0.13 deg
- the systematic uncertainty on the position is 0.1 deg
- Note: this source is not separated from its neighbour by a large
TS gap as defined in section 3.5 of Abeysekara et al. (2017)

Source Extent:

From MAGIC, HAWC and Fermi Collaborations (2019):
- " Although no significant detection was found in the HE and VHE
regimes, this investigation shows that a minimum 1deg extension (at
95% confidence level) and harder spectrum in the GeV than the one
extrapolated from HAWC results are required in the case of 2HWC
J1852+013∗"
From Abeysekara et al. (2017):
- "This source is found in the point search with a TS value of 71.4."

Spectral Properties:
From MAGIC and Fermi Collaborations (2019):
- " Although no significant detection was found in the HE and VHE
regimes, this investigation shows that a minimum 1deg extension (at
95% confidence level) and harder spectrum in the GeV than the one
extrapolated from HAWC results are required in the case of 2HWC
J1852+013∗"

From Abeysekara et al. (2017):
- spectral index: 2.90 +/- 0.10(stat) +/- 0.2(syst)
Note: the value obtained for the estimate of the diffuse flux is above
30% of the measured point source flux at 7 TeV for this source.

Source Association:

From Abdalla et al. (2021):
- "HESS J1854+013 is a source of significant gamma-ray emission in the
H.E.S.S. map near HAWC J1852+013. This region is very susceptible to
source confusion, which affects the accuracy when deriving a clear
peak position. This source is approx. 1 degree away from HAWC J1852+013
and the SNR G34.7-0.4 (W44), which is detected in the radio, X-ray,
and GeV γ-ray bands. W44 hosts the pulsar PSR B1853+01, a 20 kyr
pulsar with dE/dt= 4.3 x 10e35 erg s-1 located approx. 3 kpc away.
W44 has not been detected by H.E.S.S. during the HGPS, but H.E.S.S.
reported significant emission with only one of their analysis chains
at the location of W44, without claiming a detection (Abdalla et al., 2018)."

From MAGIC, HAWC and Fermi Collaborations (2019):
- "MAGIC does not find any excess in the direction of 2HWC J1852+013∗.
Adopting a spectral index of 2.90, the constraining 95% CL integral
ULs are 3.8x10-13 photons cm-2 s -1 for the point-like search and
1.7×10-12 photons cm-2 s-1 for the extended search. ... ULs are given
for E > 300 GeV."
- "Neither cataloged nor new sources from the Pass 8 analysis arises
in the Fermi-LAT analysis of 2HWC J1852+013∗."
From Abeysekara et al. (2017):
- "There is no known gamma-ray sources close to this location; the
nearest is the GeV source 3FGL J1852.8+0158, located 0.6 deg from the
central position of 2HWC J1852+013*. Given the source location, there
may be a significant contribution of the Galactic diffuse emission to
this source. Multiwavelength catalog searches reveal several pulsars,
several X-ray sources and HII regions in the vicinity of 2HWC
J1852+013*. Chandra observations exist of a star cluster and infrared
dark cloud IRDC G34.4+0.23 and NaSt1 (WR 122), a Wolf-Rayet binary.
The following pulsars are located close by:
- PSR J1851+0118 (∼0.1 deg, E-dot = 7.2×10e33 erg s−1, d = 5.6 kpc, age = 105 kyr)
- PSR J1850+0124 (∼0.5 deg, E-dot = 9.5×10e33 erg s−1, d = 3.4 kpc, age = 5.2 Gyr)


Seen by: HAWC, H.E.S.S.
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