A Search for Optical Line Variability in Narrow-Line Seyfert 1 Galaxies
نویسندگان
چکیده
منابع مشابه
Ultraviolet and Optical Properties of Narrow-line Seyfert 1 Galaxies
Narrow Line Seyfert 1 (NLS1) galaxies are remarkable for their extreme continuum and emission line properties which are not well understood. New results bearing on the spectroscopic characteristics of these objects are presented here, with the aim of establishing their typical ultraviolet (UV) and optical spectral behavior. We employ Hubble Space Telescope (HST) observations of 22 NLS1s, which ...
متن کاملOptical Properties of Radio-selected Narrow Line Seyfert 1 Galaxies
We present results from the analysis of the optical spectra of 47 radio-selected narrow-line Seyfert 1 galaxies (NLS1s). These objects are a subset of the First Bright Quasar Survey (FBQS) and were initially detected at 20 cm (flux density limit ∼ 1 mJy) in the VLA FIRST Survey. We run Spearman rank correlation tests on several sets of parameters and conclude that, except for their radio proper...
متن کامل[ O III ] emission line in narrow - line Seyfert 1 galaxies
Three sets of two-component profiles are used to simultaneously model the [O III]λλ4959, 5007 and Hβ lines for the Fe II-subtracted spectra of 149 narrow-line Seyfert 1 galaxies (NLSls) from the Sloan Digital Sky Survey (SDSS). Using the linewidth of the narrow/core component of [O III]λ5007 to trace the stellar velocity dispersion instead of using the total linewidth of [O III]λ5007, we found ...
متن کاملThe Narrow-line Region of Seyfert Galaxies: Narrow-line Seyfert 1s versus Broad-line Seyfert 1s
It is known that the spectral energy distribution (SED) of the nuclear radiation of narrow-line Seyfert 1 galaxies (NLS1s) has different shapes with respect to that of ordinary broad-line Seyfert 1 galaxies (BLS1s), particularly in wavelengths of X-ray. This may cause some differences in the ionization degree and the temperature of gas in narrow-line regions (NLRs) between NLS1s and BLS1s. This...
متن کامل0 Evidence of Rapid Optical Variability In Selected Narrow - Line Seyfert 1 Galaxies
We present the first results of a search for the presence of rapid optical variability in a sample of five Narrow-Line Seyfert 1 galaxies. We find clear evidence of rapid variability for IRAS 13224-3809 with variations occurring on time scales of an hour. However, the results are less conclusive for the other four sources in our sample, Markarian 766, PG 1244+026, PG 1404+226 and Arakelian 564....
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s0252921100039932