| Canonical Name: | OJ 287 |
| TeVCat Name: | TeV J0854+201 |
| Other Names: | RGB J0854+201,
PKS 0851+202,
3FGL J0854.8+2006 |
| 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 |
| Spectral Index: | 3.49 |
| Extended: | No |
| Discovery Date: | 2017-02 |
| Discovered By: | VERITAS |
| TeVCat SubCat: | Newly Announced |
Source Notes:
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. 2006). The
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 2013);"
Source Position:
The
NED position was replaced with that from
O'Brien et al. on 170904.
R.A. (J2000): 08h 54m 49.1s +/- 2.2s (stat)
Dec. (J2000): +20deg 05' 58.89" +/- 31.96"(stat)
Systematic uncertainty: < 25"
Flux:
From
O'Brien et al.:
- the flux above 150 GeV corresponds to 1.3 +/- 0.2% that of the Crab
Nebula
From
Mukherjee et al. (2017):
- the flux above 100 GeV corresponds to approx. 3% of that from the
Crab Nebula
Spectral Information:
From
O'Brien et al.:
- spectral index: 3.49 +/- 0.28
Distance:
From
Nilsson et al. (2010):
- "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"
Classification:
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., 1988)
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
been invoked."
From
Benbow et al. (2017):
- "Its SED has shown HBL-like features (
Costamante & Ghisellini, 2002)"
Seen by: VERITAS
-
A Multiwavelength Study to Decipher the 2017 Flare of the Blazar OJ 287
Acharyya, A. et al., ApJ 973 p134 (2024) [LINK]
-
Spectral Energy Distribution Variability of the Blazar OJ 287 during 2009-2021
Zuo, Wenwen et al., arXiv e-prints parXiv:2412.10752 (2024) [LINK]
-
No missing flare in OJ 287
Valtonen, Mauri J., arXiv e-prints parXiv:2411.00908 (2024) [LINK]
-
Simultaneous Optical to X-ray Spectra of OJ 287: Insights into X-ray spectral changes and particle spectra
Kushwaha, Pankaj, arXiv e-prints parXiv:2410.05783 (2024) [LINK]
-
Black hole mass estimate in OJ 287 based on the bulk-motion comptonization model
Kuznetsov, Sergey and Titarchuk, Lev, arXiv e-prints parXiv:2403.17267 (2024) [LINK]
-
Dust enrichment in the circum-galactic medium
Otsuki, Mau and Hirashita, Hiroyuki, MNRAS 528 p5008-5018 (2024) [LINK]
-
Relativistic binary-disc dynamics and OJ-287's flares: New parameter posteriors and future timing predictions
Zwick, Lorenz and Mayer, Lucio, arXiv e-prints parXiv:2305.19149 (2023) [LINK]
-
OJ 287: a new BH mass estimate of the secondary
Titarchuk, Lev et al., arXiv e-prints parXiv:2302.06068 (2023) [LINK]
-
Correlation analysis between several observables of OJ 287 radio jet
Yuan, Qi et al., arXiv e-prints parXiv:2303.09246 (2023) [LINK]
-
Refining the 2022 OJ 287 impact flare arrival epoch
Valtonen, Mauri J. et al., arXiv e-prints parXiv:2303.15886 (2023) [LINK]
-
Absence of the predicted 2022 October outburst of OJ 287 and implications for binary SMBH scenarios
Komossa, S. et al., MNRAS p (2023) [LINK]
-
K2 Optical Emission from OJ 287 and Other Gamma-Ray Blazars on Hours-to-Weeks Timescales from 2014-2018
Wehrle, Ann E. et al., arXiv e-prints parXiv:2305.17060 (2023) [LINK]
-
On the Spectral Changes of OJ 287 -- I: Particle Spectrum during the Lowest X-ray state -- extended at Optical-UV and Hard at X-rays
Kushwaha, Pankaj, arXiv e-prints parXiv:2305.16144 (2023) [LINK]
-
The blazar OJ 287 in a long-lasting low-state with small-amplitude rapid flares superposed
Komossa, S., Grupe, D., Kraus, A., MOMO team, The Astronomer's Telegram 16071 p1 (2023) [LINK]
-
Unravelling the Innermost Jet Structure of OJ 287 with the First GMVA+ALMA Observations
Zhao, Guang-Yao et al., arXiv e-prints parXiv:2205.00554 (2022) [LINK]
-
New jet feature in the parsec-scale jet of the blazar OJ287 connected to the 2017 teraelectronvolt flaring activity
Lico, R. et al., arXiv e-prints parXiv:2202.02523 (2022) [LINK]
-
Detection of a quasi-periodic oscillation in the optical light curve of the remarkable blazar AO 0235+164
Roy, Abhradeep et al., arXiv e-prints parXiv:2205.03586 (2022) [LINK]
-
Long Term Multi-band Near Infra-Red Variability of the Blazar OJ 287 during 2007--2021
Gupta, Alok C. et al., arXiv e-prints parXiv:2205.03618 (2022) [LINK]
-
Host galaxy magnitude of OJ 287 from its colours at minimum light
Valtonen, Mauri J. et al., arXiv e-prints parXiv:2205.15589 (2022) [LINK]
-
Refining the prediction for OJ 287 next impact flare arrival epoch
Valtonen, Mauri J. et al., arXiv e-prints parXiv:2209.08360 (2022) [LINK]
-
Exploration of the origin of the 2020 X-ray outburst in OJ 287
Huang, Shifeng et al., MNRAS 515 p2778-2789 (2022) [LINK]
-
Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO
Komossa, S. et al., arXiv e-prints parXiv:2207.11291 (2022) [LINK]
-
Dark Matter Constraints from the Eccentric Supermassive Black Hole Binary OJ 287
Alachkar, Ahmad et al., arXiv e-prints parXiv:2207.10021 (2022) [LINK]
-
Optical circular polarization induced by axion-like particles in blazars
Yao, Run-Min et al., arXiv e-prints parXiv:2209.14214 (2022) [LINK]
-
MOMO - V. Effelsberg, Swift, and Fermi study of the blazar and supermassive binary black hole candidate OJ 287 in a period of high activity
Komossa, S. et al., MNRAS 513 p3165-3179 (2022) [LINK]
-
Blazars SED in Conical Plasma Flow : a Monte Carlo study
Kumar, Nagendra and Kushwaha, Pankaj, arXiv e-prints parXiv:2106.06263 (2021) [LINK]
-
Multi-wavelength Analysis and Modeling of OJ 287 During 2017-2020
Prince, Raj et al., arXiv e-prints parXiv:2105.04028 (2021) [LINK]
-
A comprehensive study of the 2019-2020 flare of OJ 287 in X-ray window using Swift, XMM-Newton, NuSTAR, and AstroSat
Prince, Raj et al., arXiv e-prints parXiv:2105.03937 (2021) [LINK]
-
X-ray spectral components of the blazar and binary black hole candidate OJ 287 (2005-2020)
Komossa, S. et al., arXiv e-prints parXiv:2105.01479 (2021) [LINK]
-
A possible tidal disruption event candidate in the black hole binary system of OJ 287
Huang, Shifeng et al., arXiv e-prints parXiv:2106.14368 (2021) [LINK]
-
Supermassive binary black holes and the case of OJ 287
Komossa, S. et al., arXiv e-prints parXiv:2104.12901 (2021) [LINK]
-
Correlation between optical and gamma-ray flux variations in BL Lacs
Rajput, Bhoomika et al., MNRAS p (2021) [LINK]
-
Is OJ 287 a Single Supermassive Black Hole?
Butuzova, M.S. and Pushkarev, A.B., arXiv e-prints parXiv:2103.13845 (2021) [LINK]
-
Explaining temporal variations in the jet position angle of the blazar OJ 287 using its binary black hole central engine model
Dey, Lankeswar et al., arXiv e-prints parXiv:2103.05274 (2021) [LINK]
-
Project MOMO: Multiwavelength Observations and Modelling of OJ 287
Komossa, S. et al., arXiv e-prints parXiv:2107.00083 (2021) [LINK]
-
The blazar OJ 287 jet from parsec- to kiloparsec-scales
Butuzova, Marina S., arXiv e-prints parXiv:2109.08474 (2021) [LINK]
-
AstroSat View of Blazar OJ 287: A complete evolutionary cycle of HBL Component from end-phase to disappearance and Re-emergence
Kushwaha, Pankaj et al., arXiv e-prints parXiv:2107.10783 (2021) [LINK]
-
The BL Lac Object OJ 287: Exploring a Complete Spectrum of Issues Concerning Relativistic Jets and Accretion
Kushwaha, Pankaj, arXiv e-prints parXiv:2110.10851 (2021) [LINK]
-
Spectral States of OJ 287 blazar from Multi-wavelength Observations with AstroSat
Singh, K.P. et al., arXiv e-prints parXiv:2110.14978 (2021) [LINK]
-
Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. V. Space and ground millimeter-VLBI imaging of OJ 287
Gomez, Jose L. et al., arXiv e-prints parXiv:2111.11200 (2021) [LINK]
-
MOMO IV: The complete Swift X-ray and UV/optical light curve and characteristic variability of the blazar OJ 287 during the last two decades
Komossa, S. et al., arXiv e-prints parXiv:2112.05067 (2021) [LINK]
-
X-ray timing and spectral variability properties of blazars S5 0716+714, OJ 287, Mrk 501, and RBS 2070
Mohorian, Maksym et al., MNRAS p (2021) [LINK]
-
Promise of Persistent Multi-Messenger Astronomy with the Blazar OJ 287
Valtonen, Mauri J. et al., Galaxies 10 p1 (2021) [LINK]
-
Multi-wavelength activity of the BL Lac Blazar OJ 287 After its First VHE Activity: Spectro-temporal Evolution and Remergence of the HBL like Component
Kushwaha, Pankaj et al., arXiv e-prints parXiv:2010.14431 (2020) [LINK]
-
The host galaxy of OJ 287 revealed by optical and near-infrared imaging
Nilsson, K. et al., arXiv e-prints parXiv:2010.05487 (2020) [LINK]
-
A Possible gamma-ray Quasi-periodic Oscillation of approx. 314 days in the Blazar OJ 287
Kushwaha, Pankaj et al., MNRAS p (2020) [LINK]
-
The April-June 2020 super-outburst of OJ 287 and its long-term multiwavelength light curve with Swift: binary supermassive black hole and jet activity
Komossa, S. et al., arXiv e-prints parXiv:2008.01826 (2020) [LINK]
-
Polarization behavior of periodic optical outbursts in blazar OJ287
Qian, S.J., arXiv e-prints parXiv:2005.05517 (2020) [LINK]
-
A hadronic emission model for black hole-disc impacts in the blazar OJ 287
Rodriguez-Ramirez, J.C. et al., arXiv e-prints parXiv:2005.01276 (2020) [LINK]
-
Spitzer Observations of the Predicted Eddington Flare from Blazar OJ 287
Laine, Seppo et al., arXiv e-prints parXiv:2004.13392 (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]
-
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]
-
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]
-
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]
-
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]
-
Reversals in the Direction of Polarization Rotation in OJ 287
Cohen, M.H. et al., ArXiv e-prints p (2018) [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]
-
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]
-
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]
-
Signature of Inverse Compton emission from blazars
Gaur, H. 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]
-
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]
-
Highlights from the VERITAS AGN Observation Program
Benbow, W. and the VERITAS Collaboration, 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]
-
Radio and optical intra-day variability observations of five blazars
Liu, X. et al., ArXiv e-prints p (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]
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