Properties of Broad and Narrow Line Seyfert galaxies selected from SDSS
نویسندگان
چکیده
منابع مشابه
The 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 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 کاملUltraviolet 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 کاملNarrow-line Seyfert 1s from the SDSS Early Data Release
We present a sample of 150 narrow-line Seyfert 1s (NLS1s) found within the Sloan Digital Sky Survey Early Data Release (EDR), only one of which was previously identified as such. This more than triples the known number of NLS1s, and provides a basic method by which to identify many more with subsequent releases of SDSS data. With its large size and homogeneous, well-defined selection criteria, ...
متن کاملStatistical Properties of Narrow Line Seyfert 1 galaxies
The number of publications considering Narrow-Line Seyfert 1 galaxies has increased dramatically in recent years. Especially after the launch of the X-ray missions ROSAT and ASCA, Narrow-Line Seyfert 1s have become very popular. In these proceedings I will give an overview of how they are distributed over the electromagnetic spectrum. I will describe what we know about them at radio, infrared, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications of the Byurakan Astrophysical Observatory
سال: 2020
ISSN: 2579-2776
DOI: 10.52526/25792776-2020.67.2-219