| Canonical Name: | KUV 00311-1938 |
| TeVCat Name: | TeV J0033-193 |
| Other Names: | |
| Source Type: | HBL |
| R.A.: | 00 33 36 (hh mm ss) |
| Dec.: | -19 21 00 (dd mm ss) |
| Gal Long: | 94.24 (deg) |
| Gal Lat: | -81.21 (deg) |
| Distance: | |
| Flux: | 0.009 (Crab Units) |
| Energy Threshold: | 147 GeV |
| Spectral Index: | 5.1 |
| Extended: | No |
| Discovery Date: | 2012-07 |
| Discovered By: | H.E.S.S. |
| TeVCat SubCat: | Default Catalog |
Source Notes:
This source was moved from the Newly Announced to the Default catalogue on 200409
Source Discovery:
- This detection was announced in July 2012 at the
Gamma 2012 meeting in
Heidelberg by Becherini (poster) and Stegmann (presentation).
- It is the H.E.S.S.
Source of the month for August 2012.
Source position and its uncertainty:
On 200612 the source position was updated from that give in
NED to that given by
H.E.S.S. Collaboration (2020):
From
H.S.S.S. Collaboration (2020):
- R.A. (J2000): 00h33m36s +/- 06s (stat) +/- 1.3s (syst)
- Dec. (J2000): -19d21' +/- 1' (stat) +/- 1' (syst)
Position from
NED:
- R.A. (J2000): 00 33 34.2
- Dec. (J2000): -19 21 33
Distance:
From
H.S.S.S. Collaboration (2020):
- "A power-law fitted to the Fermi/LAT data below 10 GeV and
extrapolated to the 83 GeV to 3.0 TeV energy band was used as the
intrinsic model, Fint. This was then compared to the
H.E.S.S. observations via the measured F_VHE and dF_VHE. We derive an
upper limit of z < 0.93 using
Dominguez et al. (2011). In comparison,
using the
Franceschini (2008) model we get a limit of z < 0.98."
From
Fernandez Alonso, Pichel & Rovero (2019):
- the authors use gamma-ray observations of this object to place
constraints on its redshift. Each of the main current models for the
absorption by the extragalactic background light are utilised.
- "By comparing Fermi-LAT and HESS observations from similar time
periods and under the assumption that the TeV intrinsic spectrum is a
prolongation of the GeV spectrum, we found the measured flux to be
consistent within 1 sigma errors with the absorbed flux of a source at
z=0.5 and z=0.6 depending on the EBL model."
From
Pita et al. (2013):
- from spectroscopy: 0.506 <= z <= 1.54
- from imaging: z >= 0.47
From
Pita et al.(2012):
- "z ≥0.506; z =0.61 not confirmed"
Spectral Information:
From
H.S.S.S. Collaboration (2020):
- The spectrum was fitted by a power-law function with:
... dN/dE = N0 (E/E0)^-A where N0= normalisation at E = E0, A = photon index. N0 and A were free in the minimisation
... A: 5.1 +/- 0.6 (stat) +/- 0.3 (syst)
... N0: 4.1 +/- 0.8 (stat) +/- 1.7 (syst) x 10e-11 TeV-1cm-2s-1
... E0: 170 GeV
... Eth: 83 GeV
... F(E>Eth): 3 +/- 1 (stat) +/- 1 (sys) x 10e-11 cm-2s-1
... F(E>147 GeV): approx. 0.9% Crab flux > 147 GeV
Seen by: H.E.S.S.
-
Very high energy gamma-ray emission from two blazars of unknown redshift and upper limits on their distance
H.E.S.S. Collaboration et al., arXiv e-prints parXiv:2004.03306 (2020) [LINK]
-
Redshift of the Blazar KUV 00311-1938: Modeling the EBL Absorption
Fernandez Alonso, M. Pichel, A. & Rovero, A. C., arXiv e-prints parXiv:1909.03960 (2019) [LINK]
-
Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT
Pita, S. et al., ArXiv e-prints p (2013) [LINK]
-
Discovery of VHE gamma-ray emission from the very distant BL Lac KUV 00311-1938 by H.E.S.S.
Becherini, Y. et al., 1505 p490-493 (2012) [LINK]
-
Very-high-energy gamma-ray emission from high-redshift blazars
Neronov, A. et al., ArXiv e-prints p (2012) [LINK]
-
Discovery of the most distant BL Lacertae at very high energies with H.E.S.S.
H.E.S.S. Collaboration, Y. Becherini, C. Boisson, M. Cerruti,
Poster at the 5th International Symposium on High-Energy Gamma-Ray Astronomy, Heidelberg, July 9-13, 2012 [LINK]
Want a reference added? Send a bibtex entry to
the TeVCat Team
