Optical Observations of 3C 273 From 2000 to 2008

Details Optical Observations of 3C 273 From 2000 to 2008 Optical Observations of 3C 273 From 2000 to 2008

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....138.1428f&link_type=abstract

The Astronomical Journal, Volume 138, Issue 5, pp. 1428-1434 (2009).

Astronomy and Astrophysics

Astronomy

5

Galaxies: Active, Galaxies: Individual: 3C 273, Galaxies: Photometry

Scientific paper

The quasar 3C 273 is one of the widely studied quasars that is also a selected target in our monitoring program. In this paper, we present the optical V, R, and I photometric observations done with the 1.56 m telescope at the Shanghai Astronomical Observatory from 2000 to 2008. Our monitoring results show 1118 sets of observations (258 sets for the V band, 414 sets for the R band, and 446 sets for the I band). The observations indicate that (1) the variations in the three bands are ΔV = 1.363 ± 0.088 mag from V = 12.204 ± 0.062 to V = 13.567 ± 0.062, ΔR = 1.299 ± 0.023 mag from R = 12.014 ± 0.014 to R = 13.313 ± 0.013, and ΔI = 1.041 ± 0.088 mag from I = 11.628 ± 0.046 to I = 12.669 ± 0.075. Compared with the result by Toone, who presented the yearly averaged light curve during the period of 1980-2004 and found that the source shows a slow brightening with langVrang = 12.95 in 1996-1997 to langVrang = 12.5 in 2003-2004, our observations show that it is variable and both a state brighter than the yearly averaged brightness of langVrang = 12.5 and a state fainter than the yearly averaged brightness of langVrang = 12.95 were detected in our observing period. Intra-day variation timescales are from 13 minutes to 245 minutes. (2) The color indices are variable with V-R from -0.27 to 0.68, V - I from 0.11 to 1.14, and R - I from 0.14 to 0.86. The average values are langV - Rrang = 0.18 ± 0.10, langV - Irang = 0.64 ± 0.14, and langR - Irang = 0.46 ± 0.11.

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