$JHK'$ Imaging Photometry of Seyfert 1 AGNs and Quasars III: Variability of Radio Quiet and Radio Loud AGNs

  title={\$JHK'\$ Imaging Photometry of Seyfert 1 AGNs and Quasars III: Variability of Radio Quiet and Radio Loud AGNs},
  author={Keigo Enya and Yuzuru Yoshii and Yukiyasu Kobayashi and Takeo Minezaki and Hiroyuki Tomita and Bruce A. Peterson},
  journal={arXiv: Astrophysics},
Variability of 226 AGNs in the near-infrared $J$, $H$, and $K'$ bands is analyzed and discussed. An ensemble average for measured variabilities was obtained for various samples of the AGNs divided by absolute $B$-magnitude $M_B$, redshift $z$, and radio strength. All the samples in the $J$, $H$, and $K'$ bands are found to give significant ensemble variability, but no significant wavelength dependence is found. The ensemble variability in the entire sample combining the $J$, $H$, and $K… 

Tables from this paper

JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. II. Observation of Long-Term Variability
Observations of 226 AGNs in the near-infrared J, H, and K' bands are presented along with the analysis of the observations for variability. Our sample consists mainly of Seyfert 1 AGNs and QSOs.
Optical Variability Properties of Mini-BAL and NAL Quasars
While narrow absorption lines (NALs) are relatively stable, broad absorption lines (BALs) and mini-BAL systems usually show violent time variability within a few years via a mechanism that is not yet
Near-infrared Variability of Obscured and Unobscured X-Ray-selected AGNs in the COSMOS Field
We present our statistical study of near-infrared (NIR) variability of X-ray-selected active galactic nuclei (AGNs) in the COSMOS field, using UltraVISTA data. This is the largest sample of AGN light
Determination of the size of the dust torus in H0507+164 through optical and infrared monitoring
The time delay between flux variations in different wavelength bands can be used to probe the inner regions of active galactic nuclei (AGN). Here, we present the first measurements of the time delay
A broadband X-ray view of the NLSy1 1E 0754.6+3928
The soft X-ray band of many active galactic nuclei (AGNs) is affected by obscuration due to partially ionised matter crossing our line of sight. In this context, two past XMM-Newton observations (6
Reverberation Measurements of the Inner Radii of the Dust Tori in Quasars
We present the results of a dust-reverberation survey of quasars at redshifts z<0.6. We found a delayed response of the K-band flux variation after the optical flux variation in 25 out of 31 targets,
Medium-resolution Optical and Near-infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at z ∼ 0.3
We present medium-resolution spectra (R ∼ 2000–4000) at 0.4–1.0μm and 0.7–2.5μm of 16 active galactic nuclei (AGNs) selected with red color in the near-infrared (NIR) of J−K > 2.0 mag at z ∼ 0.3. We
The dependence of quasar variability on black hole mass
In order to investigate the dependence of quasar variability on fundamental physical parameters like black hole mass, we have matched quasars from the Quasar Equatorial Survey Team, Phase 1 (QUEST1)
Near-Infrared Variability in the 2MASS Calibration Fields: A Search for Planetary Transit Candidates
The Two Micron All Sky Survey (2MASS) photometric calibration observations cover ~6 square degrees on the sky in 35 "calibration fields", each sampled in nominal photometric conditions between 562
Astrophysics in 2002
This has been the Year of the Baryon. Some low temperature ones were seen at high redshift, some high temperature ones were seen at low redshift, and some cooling ones were (probably) reheated.


The extinction, flux distribution and luminosity of Seyfert 1 nuclei derived from UBV(RI)C aperture photometry
UBV(RI)c aperture photometry was carried out over a 4-yr period for 92 broad-line Seyfert galaxies. Where possible, the observations were repeated at different epochs in order to try to detect
The near-infrared variability of a sample of optically selected quasars
A complete sample of 108 optically selected quasars, the Palomar-Green quasars, has been studied at near-infrared wavelengths over an average time base of about 6 yr; in some cases the time base
The variability of optically selected quasars
The variability properties of a sample of 300 optically selected quasars near the South Galactic Pole (SGP) have been studied over a baseline of 16 years using a series of twelve UK Schmidt Telescope
A refined sample of 64 variable objects with stellar image structure has been identified in SA 57 to B approximately = 22.5, over a time baseline of 15 yr, sampled at 11 distinct epochs. The
Continuum energy distribution of quasars: Shapes and origins
Continuum observations from ~0.3 nm to 6 cm (10^(9.7)-10^(18) Hz) are presented for 109 bright quasars from the Palomar-Green (PG) survey. Two-thirds of the quasars have been detected in the infrared
An infrared study of hot dust in quasars using prism spectrophotometry
Low-resolution near-infrared spectra were obtained for 14 quasars with redshift z<0.3. The observed continua from 0.95 to 2.5 μm were reproduced remarkably well with a combination of two radiation
Hot dust on the outskirts of the broad-line region in Fairall 9
The Seyfert galaxy Fairall 9 (F9) has been observed in the far-UV and optical range with the IUE, and at 27 different epochs at J, H, K, and L. The UV continuum underwent dramatic variations, its
Multifrequency observations of the optically active radio-quiet quasar GQ Comae. II - Ultraviolet, optical, and infrared continuum variability
This paper summarizes the data and preliminary results of a 3 yr long project to monitor the continuum variability of GQ Comae (PG 1202+281) from 0.12 μm to 3.5 μm. Substantial variability in the
Optical variability of faint quasars
The variability properties of a quasar sample, spectroscopically complete to magnitude J = 22.0, are investigated on a time baseline of 2 yr, using three different photometric bands (U, J and F). The
The infrared-millimetre-centimetre flaring behaviour of the quasar 3C 273.
Results are presented of an investigation of the IR-cm light curve of 3C 273 for the period 1987-1991, during which several flares were observed. The apparent details of individual flares are shown