SMARTS Optical Spectroscopy of 3C 454.3

Details SMARTS Optical Spectroscopy of 3C 454.3 SMARTS Optical Spectroscopy of 3C 454.3

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840808i&link_type=abstract

American Astronomical Society, AAS Meeting #218, #408.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We report ongoing spectroscopic observations of 3C 454.3 using the Small and Moderate Aperture Research Telescope System SMARTS 1.5m telescope + RC Spectrograph located at Cerro-Tololo Inter-American Observatory (CTIO). Spectra have been obtained roughly every 14 days from August 2008 through January 2011, during which 3C 454.3 has undergone several prominent optical (and γ-ray) flares. We find that while the equivalent width (EW) of 3C 454.3 varies, the line flux remains constant. This result suggests that the Broad Line Region is photoionized by the slowly varying accretion disk rather than radiation from the relativistic jet. We find the strength of the MgII line to be consistent with a constant line flux of ˜ 2.0× 10-14 erg s-1 cm2 A-1. This constant line flux argues against the photoionization of the BLR from the relativistic jet, as this source has undergone a number of flares during the course of observation with no corresponding change in line flux. This finding also implies that accretion disk is non-variable on timescales of at least 2.5 years.

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