NGC5548 短时间尺度变动的光谱与光度研究
摘要
presented. The broad-band fluxes (U,B,V), and the spectrophotometric optical continuum flux F_lambda(5100 A) monotonically decreased in flux while the broad-band R and I fluxes and the integrated emission-line fluxes of Halpha and Hbeta remained constant to within 5%. On June 22, a short continuum flare was detected in the broad band fluxes. It had an amplitude of about ~18% and it lasted only ~90 min. The broad band fluxes and the optical continuum F_lambda(5100 A) appear to vary simultaneously with the EUV variations. No reliable delay was detected for the broad optical emission lines in response to the EUVE variations. Narrow Hbeta emission features predicted as a signature of an accretion disk were not detected during this campaign. However, there is marginal evidence for a faint feature at lambda = 4962 A with FWHM=~6 A redshifted by Delta v = 1100 km/s with respect to Hbeta_narrow.
引用
@article{arxiv.astro-ph/0104207,
title = {A Spectroscopic and Photometric Study of Short-Timescale Variability in NGC5548},
author = {M. Dietrich and C. F. Bender and D. J. Bergmann and T. E. Bills and N. G. Bochkarev and A. Burenkov and C. M. Gaskell and D. D. Gutzmer and R. Grove and M. E. Hiller and J. P. Huchra and E. S. Klimek and C. Lund and N. Merkulova and S. Pebley and M. A. Poulsen and V. I. Pronik and S. G. Sergeev and E. A. Sergeeva and A. I. Shapovalova and V. V. Vlasyuk and B. Wilkes},
journal= {arXiv preprint arXiv:astro-ph/0104207},
year = {2009}
}
备注
12 pages, 7 figures, accepted for publishing in A&A