|Canonical Name:||OJ 287|
|TeVCat Name:||TeV J0854+201|
|Other Names:||RGB J0854+201,|
|Source Type:||BL Lac (class unclear)|
|R.A.:||08 54 49.1 (hh mm ss)|
|Dec.:||+20 05 58.89 (dd mm ss)|
|Gal Long: ||206.82 (deg)|
|Gal Lat: ||35.82 (deg)|
|Distance: ||z=0.3056 |
|Flux:||0.013 (Crab Units)|
|Energy Threshold:||150 GeV|
|Discovered By: ||VERITAS|
|TeVCat SubCat:||Newly Announced|
This detection was announced in an ATel
by VERITAS on 170205:
"We report the detection of VHE emission (>100 GeV) from OJ 287 with
VERITAS. The source was observed by VERITAS between 1 February and 4
February 2017 (UTC), for a total exposure of 13.0 hours. OJ 287 is an
optically bright quasar, known to display quasi-periodicity with
roughly 12-year optical cycles (Shi et al.
2007), and is believed to
host a binary supermassive black hole (Valtonen et al.
VERITAS observations were carried out in response to a rising X-ray
flux, noted in the X-ray light curve measured by Swift-XRT
(Stroh & Falcone
position was replaced with that from O'Brien et al.
R.A. (J2000): 08h 54m 49.1s +/- 2.2s (stat)
Dec. (J2000): +20deg 05' 58.89" +/- 31.96"(stat)
Systematic uncertainty: < 25"
From O'Brien et al.
- the flux above 150 GeV corresponds to 1.3 +/- 0.2% that of the Crab
From Mukherjee et al.
- the flux above 100 GeV corresponds to approx. 3% of that from the
From O'Brien et al.
- spectral index: 3.49 +/- 0.28
From Nilsson et al.
- "The average redshift derived from the 6583 [NII] line is 0.3056 +/-
0.0001, consistent with the earlier redshift z = 0.306 (Miller et al.
1978; Sitko & Junkkarinen
1985). The error in the redshift
represents the internal precision of the measurements without
systematic effects, which are expected to be small because the
wavelength calibration was derived from sky lines exposed
simultaneously with the OJ 287 spectrum"
From O'Brien et al.
- "OJ 287 is an optically bright quasar located at a redshift of z = 0.306.
Archival optical observations dating back to 1890 (Sillanpaa et al.
have revealed a ∼ 12 year outburst cycle during which 2 optical
outbursts are observed separated by about 1 year. To explain this
quasi-periodic behaviour and deviations from the 12 year periodicity
(see Valtonen et al.
, 2011), models consisting of a binary
super-massive black hole (SMBH) system at the core of the AGN have
From Benbow et al.
- "Its SED has shown HBL-like features (Costamante & Ghisellini
Seen by: VERITAS
A Multi-wavelength View of OJ 287 Activity in 2015-2017: Implications of Spectral Changes on Central-engine Models and MeV-GeV Emission Mechanism
Kushwaha, Pankaj, arXiv e-prints parXiv:2002.02213 (2020) [LINK]
180 Degree Rotations in the Polarization Angle for Blazars
Cohen, Marshall H. and Savolainen, Tuomas, arXiv e-prints parXiv:2003.07090 (2020) [LINK]
Revealing the Nature and Location of High Energy Emission in the Candidate Binary SMBH System OJ 287
Kushwaha, P. et al., arXiv e-prints p (2019) [LINK]
Model simulation of optical light curves for blazar OJ287
Qian, S., arXiv e-prints p (2019) [LINK]
High energy neutrino flux from individual blazar flares
Oikonomou, Foteini et al., arXiv e-prints parXiv:1906.05302 (2019) [LINK]
The Unique Blazar OJ 287 and Its Massive Binary Black Hole Central Engine
Dey, Lankeswar et al., Universe 5 p108 (2019) [LINK]
Connection between optical and radio/millimeter flares in blazar OJ287
Qian, S. J, arXiv e-prints parXiv:1906.09782 (2019) [LINK]
Accretion Disk Parameters determined from the great 2015 flare of OJ 287
Valtonen, Mauri J. et al., arXiv e-prints parXiv:1907.11011 (2019) [LINK]
Study of periodic signals from blazars
Bhatta, Gopal, arXiv e-prints parXiv:1909.10268 (2019) [LINK]
Strong Soft X-ray Excess in 2015 XMM-Newton Observation of BL Lac OJ 287
Pal, Main et al., arXiv e-prints parXiv:1912.02730 (2019) [LINK]
Multiband optical flux and polarization variability of the blazar OJ 287 during 2016 - 2017
Gupta, A.C. et al., ArXiv e-prints p (2018) [LINK]
The ever-surprising blazar OJ 287: multi-wavelength study and appearance of a new component in X-rays
Kushwaha, P. et al., ArXiv e-prints p (2018) [LINK]
Revealing the Nature of Blazar Radio Cores through Multi-Frequency Polarization Observations with the Korean VLBI Network
Park, J. et al., ArXiv e-prints p (2018) [LINK]
Reversals in the Direction of Polarization Rotation in OJ 287
Cohen, M.H. et al., ArXiv e-prints p (2018) [LINK]
X-ray spectral variability of blazars using principal component analysis
Gallant, D. et al., ArXiv e-prints p (2018) [LINK]
Optical Emission and Particle Acceleration in a Quasi-Stationary Component in the Jet of OJ 287
Sasada, M. et al., ArXiv e-prints p (2018) [LINK]
Gravitational wave detection from OJ 287 via a pulsar timing array
Chen, J.-W. and Zhang, Y., MNRAS 481 p2249-2260 (2018) [LINK]
Probing the Jets of Blazars Using the Temporal Symmetry of Their Multi-Wavelength Outbursts
Roy, N. et al., ArXiv e-prints p (2018) [LINK]
A tentative double-jet model for blazar OJ287
Qian, S., 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]
VERITAS Detection of VHE Emission from OJ 287
Mukherjee, R., The Astronomer's Telegram 10051 p1 (2017) [LINK]
Radio and optical intra-day variability observations of five blazars
Liu, X. et al., ArXiv e-prints p (2017) [LINK]
VERITAS detection of VHE emission from the optically bright quasar OJ 287
O'Brien, S., 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]
Stochastic modeling of multiwavelength variability of the classical BL Lac object OJ 287 on timescales ranging from decades to hours
Goyal, A. et al., ArXiv e-prints p (2017) [LINK]
Multi-wavelength temporal and spectral variability of the blazar OJ 287 during and after the December 2015 flare: a major accretion disc contribution
Kushwaha, P. et al., ArXiv e-prints p (2017) [LINK]
Signature of Inverse Compton emission from blazars
Gaur, H. et al., ArXiv e-prints p (2017) [LINK]
Characterizing long-term optical, ultraviolet and X-ray variability in different activity states of OJ 287
Siejkowski, H. and Wierzcholska, A., MNRAS 468 p426-434 (2017) [LINK]
Detection of Possible Quasi-periodic Oscillations in the Long-term Optical Light Curve of the BL Lac Object OJ 287
Bhatta, G. et al., ApJ 832 p47 (2016) [LINK]
Want a reference added? Send a bibtex entry to the TeVCat Team