| Canonical Name: | 2HWC J1825-134 |
| TeVCat Name: | TeV J1825-134 |
| Other Names: | PSR J1826-1334
HESS J1825-137
HESS J1826-130
LS 5039
eHWC J1825-134 |
| Source Type: | UNID |
| R.A.: | 18 25 50.4 (hh mm ss) |
| Dec.: | -13 24 00 (dd mm ss) |
| Gal Long: | 18.12 (deg) |
| Gal Lat: | -0.53 (deg) |
| Distance: | |
| Flux: | (Crab Units) |
| Energy Threshold: | 7000 GeV |
| Spectral Index: | 2.58 |
| 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): 276.46 deg (= 18h 25m 50.4s)
- Dec. (J2000): -13.40 deg (= -13d 24' 00'')
- the statistical uncertainty on the position is 0.09 deg
- the systematic uncertainty on the position is 0.1 deg
Source Notes:
From
Albert et al. (2021):
- "Here we report the discovery by the High Altitude Water Cerenkov
(HAWC) observatory of the gamma-ray source, HAWC J1825-134, whose
energy spectrum extends well beyond 200 TeV without a break or
cutoff. The source is found to be coincident with a giant molecular
cloud. The ambient gas density is as high as 700 protons cm-3. While
the nature of this extreme accelerator remains unclear, CRs
accelerated to energies of several PeV colliding with the ambient gas
likely produce the observed radiation."
From
Collins et al. (2021):
- "HESS J1825-137 is one of the most powerful and luminous TeV
gamma-ray pulsar wind nebulae (PWN). To the south of HESS J1825-137,
Fermi-LAT observation revealed a new region of GeV gamma-ray emission
with three apparent peaks (termed here, GeV-ABC). This study presents
interstellar medium (ISM) data and spectral energy distribution (SED)
modelling towards the GeV emission to understand the underlying
particle acceleration."
- "It was found that the progenitor SNR of HESS J1825-137 has
insufficient energetics to account for all GeV emission. GeV-ABC may
be a reflection of an earlier epoch in the history of the PWN
associated with HESS 1825-137, assuming fast diffusion perhaps
including advection."
- "LS 5039 cannot meet the required energetics to
be the source of particle acceleration. A combination of HESS
J1825-137 and LS 5039 could be plausible sources."
From
Albert et al. (2020):
- "Here we report the discovery by the High Altitude Water Cherenkov
(HAWC) observatory of the gamma-ray source, HAWC~J1825-134, whose
energy spectrum extends well beyond 200 TeV without a break or
cutoff. The source is found to be coincident with a giant molecular
cloud. The ambient gas density is as high as 700 protons/cm3. While
the nature of this extreme accelerator remains unclear, CRs
accelerated to energies of several PeV colliding with the ambient gas
likely produce the observed radiation."
From
Abeysekara et al. (2017):
- 2HWC J1825-134 is the second brightest source found in the sky at 7 TeV in
the HAWC 2nd catalogue - this is when the extent of the source is also
taken into account
Source Extent:
From
Abeysekara et al. (2017):
- "This source is found in the point search with a TS value of 767."
Spectral Properties:
From
Abeysekara et al. (2017):
- spectral index: 2.58 +/- 0.04(stat) +/- 0.2(syst) - point-source assumption
- spectral index: 2.56 +/- 0.03(stat) +/- 0.2(syst) - 0.9deg radius assumption
Source Association:
From
Albert et al. (2021):
- "In summary we report the discovery of the gamma-ray source, HAWC J1825-134,
whose spectrum extends well beyond 200 TeV without evidence of a
cutoff or break in the spectrum. The source is found to be coincident
with a region where the density is as high as 700 protons cm−3 and
with the giant molecular cloud 99 of
Miville-Deschênes et al. (2017)
catalog. Although from HAWC data we cannot exclude that the new source
is coincident with the pulsar PSR J1826-1334 location, we found that
this scenario is disfavored. Therefore PeV cosmic-ray protons
colliding with the ambient gas likely produce the observed
radiation. We argue that the possible source of these multi-PeV cosmic
rays is the young star cluster, [BDS2003] 8"
From
Cao et al. (2021):
- 2HWC J1825-134 may be associated with
LHAASO J1825-1326
From
Abeysekara et al. (2017):
- this source was previously detected by HAWC as 1HWC J1825-133
- it is located between two previously reported TeV sources,
HESS J1825-137 and
HESS J1826-130, at about 0.4 deg from both
-
HESS J1825-137 has been the subject of a number of energy-dependent
morphological studies. "It is generally considered the prototype of
offset PWNe. It shows an energy dependent morphology at
VHE gamma rays towards the south of the pulsar PSR J1826-1334
(
Aharonian et al. 2006)."
- "The energy dependent morphology studies of HESS J1825-137 continued
in the Fermi-LAT era (
Grondin et al. 2011;
Acero et al. 2013),
strengthening the key role of this source in understanding the physics
of PWNe. The extension of the TeV spectrum at higher energies by HAWC
is in line with this scenario. With more HAWC data, future analysis
including multiple source fit will help disentangle the different
components contributing to 2HWC J1825-134"
- "We note that in the present map, the TeV binary
LS 5039 is 1.4 deg
away from 2HWC J1825-134 and is included in its TS halo in the maps
presented here. Dedicated studies are being developed to separate
emission from LS 5039 from 2HWC J1825-134."
Emission above 56 GeV and above 100 TeV:
From
HAWC Collaboration (2019):
- This source overlaps with eHWC J1825-134 one of nine sources in the
first catalog of gamma-ray sources emitting above 56 TeV presented by
the HAWC Collaboration
- The properties given in the eHWC catalog are the following:
... Source name: eHWC J1825-134
... R.A. (deg): 276.40 +/- 0.06
... Dec. (deg): -13.37 +/- 0.06
... Extension > 56 TeV (deg): 0.36 +/- 0.05
... F (10e-14 ph cm-2 s-1): 4.6 +/- 0.5
... sqrt(TS) > 56 TeV: 14.5
... Nearest 2HWC source: J1825-134
... Distance to 2HWC source (deg): 0.07
... sqrt(TS) > 100 TeV: 7.33
- This source also exhibits significant emission above 100 TeV and is fit with a spectral
model of a power law with exponential cutoff:
... sqrt(TS) of the spectral fit: 41.1
... Extension > 100 TeV (deg): 0.53 +/- 0.02
... Flux normalisation at 10 TeV (10e-13 TeV-1 cm-2 s-1): 2.12 +/- 0.15
... Spectral index: 2.12 +/- 0.06
... Cutoff Energy (TeV): 61 +/- 12
Pevatron:
From
Mitchell (2021):
- this source is included in a list of Galactic sources currently known
to produce gamma-ray emission above 100 TeV.
Seen by: HAWC
-
The Eel Pulsar Wind Nebula: a PeVatron-Candidate Origin for HAWC J1826-128 and HESS J1826-130
Burgess, Daniel A. et al., arXiv e-prints parXiv:2204.03185 (2022) [LINK]
-
The primary proton spectrum of the HAWC J1825-134 source
Dzhatdoev, Timur, arXiv e-prints parXiv:2101.10781 (2021) [LINK]
-
Using Interstellar Clouds to Search for Galactic PeVatrons: Gamma-ray Signatures from Supernova Remnants
Mitchell, A.M.W. et al., arXiv e-prints parXiv:2103.01787 (2021) [LINK]
-
Explaining the extended GeV gamma-ray emission adjacent to HESS J1828-137
Collins, T. et al., arXiv e-prints parXiv:2104.05953 (2021) [LINK]
-
Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 gamma-ray Galactic sources
Cao, Z., Aharonian, F.A., An, Q., et al., Nature 594 p33-36 (2021) [LINK]
-
Status of Ground-based and Galactic Gamma-ray Astronomy
Mitchell, A.M.W., arXiv e-prints parXiv:2109.13753 (2021) [LINK]
-
The Hunt for Pevatrons: The Case of Supernova Remnants
Cristofari, P., arXiv e-prints parXiv:2110.07956 (2021) [LINK]
-
The Contribution From TeV Halos to the Isotropic Gamma-Ray Background
Xu, Fei and Hooper, Dan, arXiv e-prints parXiv:2111.03646 (2021) [LINK]
-
Evidence of 200 TeV photons from HAWC J1825-134
Albert, A. et al., arXiv e-prints parXiv:2012.15275 (2020) [LINK]
-
Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC
HAWC Collaboration et al., arXiv e-prints parXiv:1909.08609 (2019) [LINK]
-
The 2HWC HAWC Observatory Gamma-Ray Catalog
Abeysekara, A.U. et al., ApJ 843 p40 (2017) [LINK]
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