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 Relative Articles Observations of the BL Lacertae Object OJ 287 in 1997 April and Nov ember Color Behavior Of BL Lacertae Object OJ 287 During Optical Outburst Erratic Jet Wobbling in the BL Lacertae Object OJ287 Revealed by Sixteen Years of 7mm VLBA Observations Is Low-Frequency-Peaked BL Lac Object OJ 287 a TeV Emitter? Extraordinary Activity in the BL Lac Object OJ~287 Location of gamma-ray Flare Emission in the Jet of the BL Lacertae Object OJ287 more than 14pc from the Central Engine HST Observations of BL Lacertae Environments Black hole mass and binary model for BL Lac object OJ 287 The Megaparsec-Scale X-ray Jet of the BL Lac Object OJ287 HST Observations of the Host Galaxies of BL Lacertae Objects More...
Physics  1997

# HST Imaging of the BL Lacertae Object OJ 287

DOI: 10.1086/310793

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Abstract:

Hubble Space Telescope WFPC-2 I-band (F814W) images of the BL Lacertae object OJ 287 and the surrounding field are presented. We find evidence of associated extended nebulosity near OJ 287, as well as a small nebulosity to the West, which may be spatially coincident with the position of previously observed radio emission. The brightness of a host galaxy is difficult to determine due to the brightness of the active nucleus, but it lies in the range -21.5 > M_R > -23.1 (H_0 = 100 km s^{-1} Mpc^{-1}, q_0 = 0). No evidence is seen for the previously reported optical jet'' at position angle 220 degrees to a surface brightness limit of I = 24.3 mag arcsec^{-2}. There are several resolved and unresolved objects within 17'' of OJ~287 in the field to limits of I=25 (point source 5\sigma detections). The magnitudes and relative positions of these objects are reported. An offset in the centroid position between the OJ 287 point source and the underlying nebulosity reported by Wurtz, Stocke and Yee is confirmed and measured to be about 0.4 (1.2h^{-1} kpc at the redshift of OJ~287). This offset is tentatively interpreted as evidence for recent merger activity rather than a sign of gravitational microlensing.

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