| Canonical Name: | 1ES 1959+650 |
| TeVCat Name: | TeV J1959+651 |
| Other Names: | |
| Source Type: | HBL |
| R.A.: | 19 59 59.8 (hh mm ss) |
| Dec.: | +65 08 55 (dd mm ss) |
| Gal Long: | 98.00 (deg) |
| Gal Lat: | 17.67 (deg) |
| Distance: | z=0.048 |
| Flux: | 0.64 (Crab Units) |
| Energy Threshold: | 600 GeV |
| Spectral Index: | |
| Extended: | No |
| Discovery Date: | 1999-08 |
| Discovered By: | Telescope Array |
| TeVCat SubCat: | Default Catalog |
Source Notes:
Source position and its uncertainty:
- no information available
- the source position provided by
NED is used
Spectral Properties:
From
Albert et al. (2006):
- Spectral index: 2.72 +/- 0.14
From
Krawczynski et al. (2004):
- Spectral index (high state): 2.83 +/- 0.14(stat) +/- 0.08(syst)
- Spectral index (low state): 3.18 +/- 0.17(stat) +/- 0.08(syst)
From
Tagliaferri et al. (2008):
- Spectral index (low state): 2.58 +/- 0.18
Flux
- the gamma-ray flux from 1ES 1959+650 has been found to be variable (see references)
From
Benbow et al. (2011):
- an average flux of 18% that of the Crab
From
Holder et al. (2003):
- during flaring, the flux reached 62% that of the Crab
Special Notes:
-
Krawczynski et al. (2004) detected a so-called "orphan gamma-ray flare" from this object
Information on the jet:
From
Lister et al. (2019):
- "The jet structure was too weak and compact at 15 GHz to reliably
measure any robust features.
Piner et al. (2010) obtained a maximum
speed measurement of 0.0322 +/- 0.0064 mas y-1 at 43 GHz"
Seen by: Telescope Array, Whipple, MAGIC, VERITAS, FACT, LHAASO
-
Detection of X-Ray Polarization from the Blazar 1ES 1959+650 with the Imaging X-Ray Polarimetry Explorer
Errando, Manel et al., ApJ 963 p5 (2024) [LINK]
-
LHAASO detects TeV Gamma-ray Activity from 1ES 1959+650
Xiang, Guangman et al., The Astronomer's Telegram 16437 p1 (2024) [LINK]
-
X-ray Intraday Variability of HBL Blazars with XMM-Newton
Devanand, P.U. et al., arXiv e-prints parXiv:2209.05515 (2022) [LINK]
-
Absorption effects in the blazar's gamma-ray spectra due to luminous stars crossing the jet
Bednarek, W. and Sitarek, J., MNRAS p (2021) [LINK]
-
AstroSat observation of the HBL 1ES 1959+650 during its October 2017 flaring
Shah, Zahir et al., arXiv e-prints parXiv:2104.13472 (2021) [LINK]
-
X-ray Observations of 1ES 1959+650 in its high activity state in 2016-2017 with AstroSat and Swift
Chandra, S. et al., arXiv e-prints parXiv:2105.08119 (2021) [LINK]
-
Exploring the High-Energy Gamma-Ray Spectra of TeV Blazars
Feng, Qi, arXiv e-prints parXiv:2108.05333 (2021) [LINK]
-
Detectability of large correlation length inflationary magnetic field with Cherenkov telescopes
Korochkin, Alexander et al., arXiv e-prints parXiv:2111.10311 (2021) [LINK]
-
Broadband characterisation of the very intense TeV flares of the blazar 1ES 1959+650 in 2016
MAGIC Collaboration et al., arXiv e-prints parXiv:2002.00129 (2020) [LINK]
-
Testing two-component models on very-high-energy gamma-ray emitting BL Lac objects
MAGIC Collaboration et al., arXiv e-prints parXiv:2006.04493 (2020) [LINK]
-
A two-zone photohadronic interpretation of the EHBL-like behavior of the 2016 multi-TeV flares of 1ES 1959+650
Sahu, Sarira et al., arXiv e-prints parXiv:2011.00082 (2020) [LINK]
-
Multi-TeV flaring in nearby High Energy Blazars: A photohadronic scenario
Sahu, Sarira, arXiv e-prints parXiv:1907.01174 (2019) [LINK]
-
On the TeV gamma-ray and X-ray correlations exhibited in high-energy peaked BL Lacs: Mrk 501 and 1ES 1959+650
Osorio, Mabel et al., arXiv e-prints parXiv:1909.00897 (2019) [LINK]
-
Blazar Spectra with Hard-sphere-like Acceleration of Electrons
Asano, K. and Hayashida, M., ArXiv e-prints p (2018) [LINK]
-
Multi-color optical monitoring of ten blazars from 2005 to 2011
Meng, N. et al., ArXiv e-prints p (2018) [LINK]
-
Systematic investigation of X-ray spectral variability of TeV blazars during flares in the RXTE era
Wang, Y. et al., ArXiv e-prints p (2018) [LINK]
-
Long-term optical monitoring of TeV emitting blazars. I. Data analysis
Nilsson, K. et al., A&A 620 pA185 (2018) [LINK]
-
X-ray Intraday Variability of Five TeV Blazars with NuSTAR
Pandey, A. et al., ArXiv e-prints p (2017) [LINK]
-
Multi-wavelength study of flaring activity in HBL 1ES 1959+650 during 2015-16
Kaur, N. et al., ArXiv e-prints p (2017) [LINK]
-
Impact of seeing and host galaxy into the analysis of photo-polarimetric microvariability in blazars - Case study of the nearby blazars 1ES 1959+650 and HB89 2201+044
Sosa, M. et al., ArXiv e-prints p (2017) [LINK]
-
Highlights from the VERITAS AGN Observation Program
Benbow, W. and the VERITAS Collaboration, ArXiv e-prints p (2017) [LINK]
-
The exceptional TeV flaring activity of the blazar 1ES 1959+650 in 2015 and 2016 as observed with VERITAS
M.Sant and er for the VERITAS Collaboration, ArXiv e-prints p (2017) [LINK]
-
Broadband study of blazar 1ES 1959+650 during flaring state in 2016
Patel, S.R. et al., ArXiv e-prints p (2017) [LINK]
-
Hard X-ray properties of NuSTAR blazars
Bhatta, G. et al., ArXiv e-prints p (2017) [LINK]
-
Fermi-LAT, FACT, MAGIC and VERITAS detection of increasing gamma-ray activity from the high-energy peaked BL Lac object 1ES 1959+650
Buson, S., Magill, J.D., Dorner, D. et al., The Astronomer's Telegram 9010 p1 (2016) [LINK]
-
FACT measures increased gamma-ray flux from the high-energy peaked BL Lac object 1ES 1959+650 since five nights
Biland, A., The Astronomer's Telegram 9139 p1 (2016) [LINK]
-
Further increase of gamma-ray emission from the HBL 1ES 1959+650
Biland, A., The Astronomer's Telegram 9148 p1 (2016) [LINK]
-
FACT and MAGIC measure an increased gamma-ray flux from the HBL 1ES 1959+650
Biland, A., The Astronomer's Telegram 9203 p1 (2016) [LINK]
-
A new highest historical X-ray State in 1ES 1959+650
Kapanadze, B., Dorner, D., Kapanadze, S., The Astronomer's Telegram 9205 p1 (2016) [LINK]
-
FACT measures new maximum flux from the HBL 1ES 1959+650 at TeV energies
Dorner, D., The Astronomer's Telegram 9239 p1 (2016) [LINK]
-
Could the Wein fireball be associated to the ''orphan'' TeV flares ?
Fraija, N., ArXiv e-prints p (2015) [LINK]
-
VERITAS observation of a bright very-high-energy gamma-ray flare from 1ES 1959+650
Mukherjee, R., The Astronomer's Telegram 8148 p1 (2015) [LINK]
-
Fermi LAT detection of increasing GeV gamma-ray activity from the high-energy peaked BL Lac object 1ES 1959+650
Ciprini, S., The Astronomer's Telegram 8193 p1 (2015) [LINK]
-
Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
Aliu, E. et al., ArXiv e-prints p (2014) [LINK]
-
The Stability of BVRI Comparison Stars Near Selected TeV Blazars
Pace, C.J. et al., ArXiv e-prints p (2013) [LINK]
-
Long-term optical polarization variability of the TeV blazar 1ES 1959+650
Sorcia, M. et al., ArXiv e-prints p (2013) [LINK]
-
The Blazar Emission Environment: Insight from Soft X-ray Absorption
Furniss, A. et al., ArXiv e-prints p (2013) [LINK]
-
Hadronic-Origin orphan TeV flare from the 1ES 1959+650
Sahu, S. et al., ArXiv e-prints p (2013) [LINK]
-
Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
VERITAS Collaboration et al., ArXiv e-prints p (2013) [LINK]
-
Long-term spectral and temporal behavior of the high-frequency peaked BL LAC object 1ES 1959+650
Backes, M. et al., 1505 p522-525 (2012) [LINK]
-
Monitoring of bright, nearby Active Galactic Nuclei with the MAGIC telescopes
Wagner, R. et al., ArXiv e-prints p (2011) [LINK]
-
Quasi-simultaneous two band optical variability of the blazars 1ES 1959+650 and 1ES 2344+514
Gaur, H. et al., ArXiv e-prints p (2011) [LINK]
-
Probing the Transition Between the Synchrotron and Inverse-compton Spectral Components of 1ES 1959+650
Bottacini, E. et al., ApJ 719 pL162-L166 (2010) [LINK]
-
The Jets of TeV Blazars at Higher Resolution: 43 GHz and Polarimetric VLBA Observations from 2005 to 2009
Piner, B.G. et al., ApJ 723 p1150-1167 (2010) [LINK]
-
X-ray spectral evolution of TeV BL Lacertae objects: eleven years of observations with BeppoSAX, XMM-Newton and Swift satellites
Massaro, F. et al., A&A 478 p395-401 (2008) [LINK]
-
Simultaneous Multiwavelength Observations of the Blazar 1ES 1959+650 at a Low TeV Flux
Tagliaferri, G. et al., ApJ 679 p1029-1039 (2008) [LINK]
-
The Parsec-Scale Jets of the TeV Blazars H1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
Piner, B.G. et al., ApJ 678 p64-77 (2008) [LINK]
-
Observation of Very High Energy Gamma-Ray Emission from the Active Galactic Nucleus 1ES 1959+650 Using the MAGIC Telescope
Albert, J. et al., ApJ 639 p761-765 (2006) [LINK]
-
Multiwavelength Observations of 1ES 1959+650, 1 Year after the Strong Outburst of 2002
Gutierrez, K. et al., ApJ 644 p742-747 (2006) [LINK]
-
Tera-electron-volt radiation from the blazar 1ES 1959+650 in 2004
Fidelis, V.V., Astronomy Reports 50 p809-813 (2006) [LINK]
-
Neutrino Emission in the Hadronic Synchrotron Mirror Model: The ``Orphan'' TeV Flare from 1ES 1959+650
Reimer, A. et al., ApJ 630 p186-190 (2005) [LINK]
-
High energy neutrinos from the TeV Blazar 1ES 1959 + 650
Halzen, F. and Hooper, D., Astroparticle Physics 23 p537-542 (2005) [LINK]
-
Spectrum of Very High Energy Gamma-Rays from the blazar 1ES 1959+650 during Flaring Activity in 2002
Daniel, M.K. et al., ApJ 621 p181-187 (2005) [LINK]
-
Multiwavelength Observations of Strong Flares from the TeV Blazar 1ES 1959+650
Krawczynski, H. et al., ApJ 601 p151-164 (2004) [LINK]
-
The Parsec-Scale Structure and Jet Motions of the TeV Blazars 1ES 1959+650, PKS 2155-304, and 1ES 2344+514
Piner, B.G. and Edwards, P.G., ApJ 600 p115-126 (2004) [LINK]
-
Detection of TeV Gamma Rays from the BL Lacertae Object 1ES 1959+650 with the Whipple 10 Meter Telescope
Holder, J. et al., ApJ 583 pL9-L12 (2003) [LINK]
-
Wide band X-ray and optical observations of the BL Lac object 1ES 1959+650 in high state
Tagliaferri, G. et al., A&A 412 p711-720 (2003) [LINK]
-
Detection of TeV gamma-rays from the BL Lac 1ES 1959+650 in its low states and during a major outburst in 2002
Aharonian, F. et al., A&A 406 pL9-L13 (2003) [LINK]
-
Detection of a new TeV gamma-ray source of BL Lac object 1ES 1959+650
Nishiyama, T., 3 p370-+ (1999) [LINK]
Want a reference added? Send a bibtex entry to
the TeVCat Team
