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Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring

1994; IOP Publishing; Volume: 437; Linguagem: Inglês

10.1086/174978

1538-4357

J. A. Stevens, S. J. Litchfield, E. I. Robson, D. H. Hughes, W. K. Gear, H. Teräsranta, E. Valtaoja, M. Tornikoski,

Radio Astronomy Observations and Technology

view Abstract Citations (88) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multifrequency Observations of Blazars. V. Long-Term Millimeter, Submillimeter, and Infrared Monitoring Stevens, J. A. ; Litchfield, S. J. ; Robson, E. I. ; Hughes, D. H. ; Gear, W. K. ; Terasranta, H. ; Valtaoja, E. ; Tornikoski, M. Abstract Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars and, in particular, to test predictions of shock models for the early phases of flare evolution. It is shown that time delays between light curves and flare amplitudes at different frequencies are in good agreement with existing shock models. Evidence is found for the flares in BL Lac objects to reach maximal development at lower frequency than those of optically violent variable quasars. On short timescales the variability behavior is complex, with "flickering" over a range of amplitudes. Most objects that underwent a large outburst during the monitoring period show a flattening of the 375-150 GHz spectral slope with increasing 270 GHz flux. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/174978 Bibcode: 1994ApJ...437...91S Keywords: Astronomical Models; Bl Lacertae Objects; Infrared Astronomy; Millimeter Waves; Quasars; Radio Astronomy; Radio Jets (Astronomy); Submillimeter Waves; Astronomical Photometry; Astronomical Spectroscopy; Continuums; Infrared Telescopes; Mathematical Models; Radio Telescopes; Shock Wave Interaction; Astronomy; GALAXIES: BL LACERTAE OBJECTS: GENERAL; GALAXIES: JETS; GALAXIES: QUASARS: GENERAL; RADIATION MECHANISMS: NONTHERMAL; RADIO CONTINUUM: GALAXIES full text sources ADS | data products NED (17) SIMBAD (16)