Continuum radiation from active galactic nuclei
JN Bregman - The Astronomy and Astrophysics Review, 1990 - Springer
Active galactic nuclei (AGN) can be divided into two broad classes, where the emitted
continuum power is dominated either by thermal emission (radio-quiet AGN), or by …
continuum power is dominated either by thermal emission (radio-quiet AGN), or by …
Rapid optical variability in active galactic nuclei and quasars
W Webb, M Malkan - The Astrophysical Journal, 2000 - iopscience.iop.org
We monitored 23 quasars and Seyfert 1 galaxies on timescales of minutes, hours, days,
weeks, 3 weeks, and 3 months. Observations were made in broad continuum bands of blue …
weeks, 3 weeks, and 3 months. Observations were made in broad continuum bands of blue …
Recovery of broad emission lines of NGC 4151
K Ayani, H Maehara - … of Japan, Publications (ISSN 0004-6264) …, 1991 - adsabs.harvard.edu
We found intense broad components of the Hα\and Hβ\emission lines of a Seyfert galaxy,
NGC 4151, observed on July 27 and 28, 1990. Their intensities were stronger by a factor of …
NGC 4151, observed on July 27 and 28, 1990. Their intensities were stronger by a factor of …
Optical Monitoring of the Seyfert Galaxy NGC 4151 from 1997 to 2003
D Guo, J Tao, B Qian - … of the Astronomical Society of Japan, 2006 - academic.oup.com
CCD photometric observations (, and) of the Seyfert galaxy NGC 4151 were carried out from
1997 May 9 to 2003 May 25. A possible microvariation was found simultaneously in three …
1997 May 9 to 2003 May 25. A possible microvariation was found simultaneously in three …
Changes of the He II 4686 Å broad line asymmetry of NGC 4151 in 1986-1990
NG Bochkarev, LS Nazarova… - Astronomical and …, 1992 - Taylor & Francis
The NGC 4151 optical spectra obtained with the TV scanner of the 6-meter telescope in
1986-1990 are presented. The 4060-4860 Å spectral range was observed. The dispersion …
1986-1990 are presented. The 4060-4860 Å spectral range was observed. The dispersion …
Spectrophotometry of the nucleus of the galaxy ngc 4151 in 1988
VV Prokof'eva, LM Sharipova - Astronomical and Astrophysical …, 1999 - Taylor & Francis
Spectrophotometric observations of the nucleus of the galaxy NGC 4151, the reference star
and spectrophotometric standards were carried out at the Crimean Astrophysical …
and spectrophotometric standards were carried out at the Crimean Astrophysical …
[PDF][PDF] LONG-TERM OPTICAL VARIABILITY OF THE ACTIVE NUCLEUS OF THE SEYFERT GALAXY NGC 4151
PE CHRISTOPOULOU, CD GOUDIS - researchgate.net
ABSTRACT A summary of photometric observations obtained in 1983. 1987, 1988, 1989,
1990 and 1991 to monitor the active galactic nucleus of the Seyfert galaxy NGC 4151 is …
1990 and 1991 to monitor the active galactic nucleus of the Seyfert galaxy NGC 4151 is …
NGC 4151 entering in an active phase
PE Christopoulou, CD Goudis, N Solomos… - Astrophysics and space …, 1993 - Springer
NGC 4151 entering in an active phase Page 1 NGC 4151 ENTERING IN AN ACTIVE PHASE
P.-E. CHRISTOPOULOU, CD GOUDIS, N. SOLOMOS Astronomical Laboratory, Department of …
P.-E. CHRISTOPOULOU, CD GOUDIS, N. SOLOMOS Astronomical Laboratory, Department of …
[图书][B] Detection of small-amplitude optical variability in galactic nuclei
SR McNeil - 2004 - search.proquest.com
A new photometry technique is developed for the detection of small-amplitude optical
variability in galactic nuclei. This technique utilizes the surface brightness profiles of …
variability in galactic nuclei. This technique utilizes the surface brightness profiles of …
Spectrophotometric monitoring of the nucleus of the galaxy NGC 4151 at its light minimum in 1988
LM Sharipova, VV Prokof'eva - Astrophysics, 1998 - Springer
Spectrophotometric monitoring of the nucleus of the galaxy NGC 4151 was carried out for 13
nights from 23 January to 10 June 1988 in the wavelength range 4000–7000 Å. A 0.5-m …
nights from 23 January to 10 June 1988 in the wavelength range 4000–7000 Å. A 0.5-m …