Infrared, radio and optical variability of the BL Lacertae object 2007+777

Details Infrared, radio and optical variability of the BL Lacertae object 2007+777 Infrared, radio and optical variability of the BL Lacertae object 2007+777

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..937p&link_type=abstract

Astronomy and Astrophysics, v.353, p.937-943 (2000)

Astronomy and Astrophysics

Astrophysics

20

Galaxies: Active, Galaxies: Bl Lacertae Objects: Individual: 2007+777, Radio Continuum: Galaxies

Scientific paper

We present infrared observations at wavelengths of 60 and 100 mu m and contemporaneous radio (five frequencies) and optical (R band) monitoring of the BL Lac object 2007+777. During a three-week campaign with the ISO, the VLA, the Effelsberg 100 m radio telescope, and optical telescopes in Heidelberg and on Calar Alto, Spain, we observed variability on time scales of a few days at 100 mu m, at radio, and at optical frequencies. We discuss briefly several generic models which could account for our observations. The attempt at explaining the results by an intrinsic mechanism requires an extremely small source angular size of the order of a few mu as which can be reconciled with the 1012 K inverse Compton limit only when the Doppler factor of the bulk flow is about 40. The general behavior of the variability of the BL Lac object 2007+777 found in this IR-radio campaign follows the expectations of a shock-in-jet model, and we argue that this is the most likely explanation of our observations. Based on observations made with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with participation of ISAS and NASA. Infrared Space Observatory. The Very Large Array, New Mexico, is operated by Associated Universities, Inc., under contract with the National Science Foundation. The German-Spanish Astronomical Centre, Calar Alto, is operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy. 1mu as = 10-6 arcsec

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