The infrared variability of 3C 273

Details The infrared variability of 3C 273 The infrared variability of 3C 273

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acasn..43..140w&link_type=abstract

Acta Astronomica Sinica, vol.43, no.2, p. 140-144

Astronomy and Astrophysics

Astronomy

Galaxies: Active, Quasars: 3C273, Galaxies: Fundamental Parameters, Infrared: Galaxies

Scientific paper

In this paper, the near-infrared data are compiled from the available literature for the quasar 3C 273 and are used to analyze the variability properties. The largest amplitudes of the near-IR variation are ?J =1.0, ?H=0.9, ?K=0.86, and the color indexes are =0.82, = 1.96, =1.13. The discrete correlation function (DCF) method indicates that the variability between any two infrared bands is correlated without time lag. The relation between the color index and the brightness is also investigated and the result indicates that the spectrum steeps when the source dims but the spectrum flattens when the source dims further suggesting that the emissions of 3C 273 in near-IR consist of at least two components. Some discussions are presented.

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