Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. III. Optical Variability and X-ray/UV/Optical Correlations

Simple item page
dc.creatorDesroches, Louis-Benoit
dc.creatorFilippenko, Alexei V.
dc.creatorKaspi, Shai
dc.creatorLaor, Ari
dc.creatorMaoz, Dan
dc.creatorGaneshalingam, Mohan
dc.creatorLi, Weidong
dc.creatorMoran, Edward C.
dc.creatorSwift, Brandon
dc.creatorBentz, Misty C.
dc.creatorHo, Luis C.
dc.creatorNandra, Kirpal
dc.creatorO'Neill, Paul M.
dc.creatorPeterson, Bradley M.
dc.date2006-06-20
dc.date.accessioned2026-07-07T10:39:20Z
dc.date.available2026-07-07T10:39:20Z
dc.descriptionWe present optical observations of the low-luminosity Seyfert 1 nucleus of NGC 4395, as part of a multiwavelength reverberation-mapping program. Observations were carried out over two nights in 2004 April at Lick, Wise, and Kitt Peak Observatories. We obtained V-band and B-band photometry, and spectra over the range 3500-6800 Angstroms. Simultaneous Hubble Space Telescope UV and Chandra X-ray observations are presented in companion papers. Even though NGC 4395 was in an extremely low state of activity, we detect significant continuum variability of 2-10%, increasing toward shorter wavelengths. The continuum light curves, both spectroscopic and photometric, are qualitatively similar to the simultaneous UV and X-ray light curves. Inter-band cross-correlations suggest that the optical continuum emission lags behind the UV continuum emission by 24 +7/-9 min, and that the optical continuum emission lags behind the X-ray continuum emission by 44 +/- 13 min, consistent with a reprocessing model for active galactic nucleus emission. There are also hints of Balmer emission lines lagging behind the optical continuum by an amount slightly larger than the emission-line lag detected in the UV. These results are all similar to those of other Seyfert 1 nuclei. The emission-line lag yields a mass measurement of the central black hole, which although not very significant, is consistent with the value derived from the simultaneous UV data.
dc.description29 pages, 16 figures, emulateapj, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606494
dc.identifierhttp://arxiv.org/abs/astro-ph/0606494
dc.identifierAstrophys.J.650:88-101,2006
dc.identifierdoi:10.1086/507263
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180992
dc.subjectAstrophysics
dc.titleMultiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. III. Optical Variability and X-ray/UV/Optical Correlations
dc.typetext

Files

Collections

arXiv