Volume 445, Number 1, January I 2006
|Page(s)||L1 - L4|
|Published online||13 December 2005|
Letter to the Editor
A rapid and dramatic outburst in Blazar 3C 454.3 during May 2005
Optical and infrared observations with REM and AIT
Dipartimento di Fisica e Osservatorio Astronomico, Università di Perugia, via A. Pascoli, 06123 Perugia, Italy e-mail: firstname.lastname@example.org
2 INAF, Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), Italy
3 Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, PA 16802, USA
4 Tuorla Astronomical Observatory, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
5 INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (Lc), Italy
6 Universitá degli studi di Milano-Bicocca, Dipartimento di Fisica, Piazza delle Scienza 3, 20126 Milan, Italy
7 INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy
8 Dunsink Observatory, Castleknock Dublin 15, Ireland
9 INAF, Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Italy
10 INAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
11 IASF/CNR, Sezione di Palermo, via Ugo La Malfa 153, 90146 Palermo, Italy
12 IASF/CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
Accepted: 8 October 2005
The flat-spectrum radio quasar 3C 454.3 is well known to be a highly active and variable source with outbursts occurring across the whole electromagnetic spectrum over the last decades. In spring 2005, 3C 454.3 has been reported to exhibit a strong optical outburst which subsequently triggered multi-frequency observations of the source covering the radio up to γ-ray bands. Here, we present first results of our near-IR/optical (V, R, I, H band) photometry performed between May 11 and August 5, 2005 with the Rapid Eye Mount (REM) at La Silla in Chile and the Automatic Imaging Telescope (AIT) of the Perugia University Observatory. 3C 454.3 was observed during an exceptional and historical high state with a subsequent decrease in brightness over our 86 days observing period. The continuum spectral behaviour during the flaring and declining phase suggests a synchrotron peak below the near-IR band as well as a geometrical origin of the variations e.g. due to changes in the direction of forward beaming.
Key words: galaxies: active / galaxies: blazars: general / galaxies: blazars: individual: 3C 454.3 / galaxies: jets / galaxies: quasars: general
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.