GB6 J1058+5628: A New Quasi-periodic BL Lac Object from the Asiago Plate Archive

Details GB6 J1058+5628: A New Quasi-periodic BL Lac Object from the Asiago Plate Archive GB6 J1058+5628: A New Quasi-periodic BL Lac Object from the Asiago Plate Archive

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aj....139.2425n&link_type=abstract

The Astronomical Journal, Volume 139, Issue 6, pp. 2425-2432 (2010).

Astronomy and Astrophysics

Astronomy

1

Bl Lacertae Objects: Individual: Gb6 J1058+5628 Gb6 J1148+5254 Gb6 J1209+4119, Galaxies: Active

Scientific paper

We present the historic photographic light curves of three little known blazars (two BL Lac objects and one FSRQ), GB6 J1058+5628, GB6 J1148+5254, and GB6 J1209+4119, spanning a time interval of about 50 years, mostly built using the Asiago plate archive. All objects show evident long-term variability, over which short-term variations are superposed. One source, GB6 J1058+5628, showed a marked quasi-periodic variability of 1 mag on timescale of about 6.3 years, making it one of the few BL Lac objects with a quasi-periodic behavior.

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