| Canonical Name: | MAGIC J1857.2+0263 |
| TeVCat Name: | TeV J1857+026m |
| Other Names: | HESS J1857+026
1HWC J1857+023
2HWC J1857+027 |
| Source Type: | PWN |
| R.A.: | 18 57 13.0 (hh mm ss) |
| Dec.: | +02 37 31 (dd mm ss) |
| Gal Long: | 35.93 (deg) |
| Gal Lat: | -0.09 (deg) |
| Distance: | |
| Flux: | (Crab Units) |
| Energy Threshold: | 1000 GeV |
| Spectral Index: | 2.2 |
| Extended: | Yes |
| Size (X): | 0.17 (deg) |
| Size (Y): | 0.06 (deg) |
| Discovery Date: | 2014-11 |
| Discovered By: | MAGIC |
| TeVCat SubCat: | Default Catalog |
Source Notes:
This source and
MAGIC J1857.6+0297 form part of a two-source scenario
that the MAGIC data favour for
HESS J1857+026
Source Position:
From
Aleksic et al. (2014):
- R.A. (J2000): 18h 57m 13.0s +/- 4.0s(stat) +/- 10.8s(syst)
- Dec. (J2000): 02d 37' 31" +/- 50"(stat) +/- 3'(syst)
Source extent:
From
Aleksic et al. (2014):
- This elongated source was fitted by a noncircular 2D Gaussian
yielding an intrinsic extension of:
- major axis: 0.17 +/- 0.03(stat) +/- 0.02(syst) deg
- minor axis: 0.06 +/- 0.03(stat) +/- 0.02(syst) deg
- major axis has an inclination of 37 +/- 6(stat) deg counter-clockwise wrt R.A. axis
Spectral Information:
From
Aleksic et al. (2014):
- Spectral index: 2.2 +/- 0.1 (stat) above 1 TeV
Flux:
From
Aleksic et al. (2014):
- the differential flux is approximately 45% of the total differential
flux measued by MAGIC at 1 TeV for
HESS J1857+026
Source Association:
From
Aleksic et al. (2014):
- "... we expect MAGIC J1877.2+0263 to be associated with PSR J1856+0245"
- "We then interpret MAGIC J1857.2+0263 as the emission from the relic
PWN of PSR J1856+0245. We expect that the elongated shape of the
emission above 1 TeV as well as its offset position from the pulsar
are signatures of complex PWN evolutionary processes, which involve an
interaction with the SNR reverse shock, while the initial pulsar
velocity could also play a role."
From
Abeysekara et al. (2015):
- "The source 1HWC J1857+023* is detected at 6.2sigma post trials and
is approx. 0.4deg away from both
HESS J1857+026 and
HESS J1858+020.
... The flux of
HESS J1857+026 is approximately an order of
magnitude higher than
HESS J1858+020, and the differential flux
normalization from 1HWC J1857+023 is compatible with the combined flux
of
HESS J1857+026 and
HESS J1858+020"
*1HWC J1857+023 is not listed under a separate entry in TeVCat. It is
listed as an associated source for
HESS J1857+026,
HESS J1858+020,
MAGIC J1857.2+0253 and
MAGIC J1857.6+0297.
Seen by: H.E.S.S., MAGIC, HAWC
-
MAGIC reveals a complex morphology within the unidentified gamma-ray source HESS J1857+026
MAGIC Collaboration et al., A&A 571 pA96 (2014) [LINK]
Want a reference added? Send a bibtex entry to
the TeVCat Team
