The long-term multiband optical observations and colour index for the quasar 3C 273

Details The long-term multiband optical observations and colour index for the quasar 3C 273 The long-term multiband optical observations and colour index for the quasar 3C 273

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.392.1181d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 392, Issue 3, pp. 1181-1192.

Astronomy and Astrophysics

Astronomy

11

Bl Lacertae Objects: General, Bl Lacertae Objects: Individual: 3C 273, Galaxies: Photometry

Scientific paper

The long baseline simultaneous multiband (BVRI) observations of blazar 3C 273 are presented. We have made 758 optical multiband observations with the Yunnan Astronomical Observatory (YAO) 103 cm and Shanghai Astronomical Observatory (SHAO) 156cm from 2003 January to 2005 April. In our observational campaign, the average colour indices are B - V = 0.21, V - R = 0.26 and R - I = 0.31. The mean magnitudes in B, V, R and I are 12.895, 12.698, 12.441 and 12.139, respectively. The source is in a steady state over observational campaign. The correlations between colour index and brightness are discussed. We find that the correlations of B - V versus B, V - R versus V and R - I versus R have significant negative correlation, while B - V versus V, V - R versus R and R - I versus I have positive correlation. These strong correlations imply that the spectrum becomes bluer (flatter) when the source becomes brighter, and redden (softer) when the source fades both in intraday and long-term variability. The spectral evolution trends of 3C 273 are consistent with those of BL Lac objects.

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