2001A&A...374..435M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET06:52:13

2001A&A...374..435M - Astronomy and Astrophysics, volume 374, 435-442 (2001/8-1)

Two-sided radio emission in ON 231 (W Comae).

MASSARO E., MANTOVANI F., FANTI R., NESCI R., TOSTI G. and VENTURI T.

Abstract (from CDS):

Recent radio images of the BL Lac object ON 231 (W Com, 1219+285) show remarkable new features in the source structure compared to those previously published. The images were obtained from observations made with the European VLBI Network plus MERLIN at 1.6GHz and 5GHz after the exceptional optical outburst occurred in Spring 1998. The up-to-date B band historic light curve of ON 231 is also presented together with the R band luminosity evolution in the period 1994-1999. We identify the source core in the radio images with the brightest component having the flattest spectrum. A consequence of this assumption is the existence of a two-sided emission in ON 231 not detected in previous VLBI images. A further new feature is a large bend in the jet at about 10mas from the core. The emission extends for about 20mas after the bend, which might be due to strong interaction with the environment surrounding the nucleus. We suggest some possible interpretations to relate the changes in the source structure with the optical and radio flux density variation in the frame of the unification model.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - individual: ON 231

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 7C 1219+2830 BLL 12 21 31.6902446545 +28 13 58.500383827   16.81 16.11 14.24   ~ 782 1
2 7C 1308+3236 BLL 13 10 28.66387 +32 20 43.7831   15.61 15.24 17.91   ~ 754 1
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3776 1
4 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 686 2

    Equat.    Gal    SGal    Ecl

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2020.10.28-06:52:13

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