A Complete Sample of Soft X-Ray-selected AGNs. I. The Data*

@article{Grupe2003ACS,
  title={A Complete Sample of Soft X-Ray-selected AGNs. I. The Data*},
  author={Dirk Grupe and Beverley J. Wills and Karen Marie Leighly and Helmut Meusinger},
  journal={The Astronomical Journal},
  year={2003},
  volume={127},
  pages={156-179}
}
We present the optical spectra and simple statistical analysis for a complete sample of 110 soft X-ray?selected AGNs. About half of the sources are narrow-line Seyfert 1 galaxies (NLS1's), which have the steepest X-ray spectra, the strongest Fe II emission, and slightly weaker [O III] ?5007 emission than broad-line Seyfert 1's (BLS1's). Kolmogorov-Smirnov tests show that NLS1's and BLS1's have clearly different distributions of the X-ray spectral slope ?X, X-ray short-term variability, and Fe… 
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References

SHOWING 1-10 OF 50 REFERENCES
The soft x-ray properties of a complete sample of optically selected quasars. 1: First results
We present the —nal results of a ROSAT PSPC program to study the soft X-ray emission properties of a complete sample of low-z quasars. This sample includes all 23 quasars from the Bright Quasar
X-ray variability in a complete sample of Soft X-ray selected AGN
We present ROSAT All-Sky Survey and ROSAT pointed observations (PSPC and HRI) of a complete sample of 113 bright soft X-ray AGN selected from the ROSAT Bright Source Catalog. We compare these
Hβ line width and the UV–X-ray spectra of luminous AGN
Abstract The width of the broad H β emission line is the primary defining characteristic of the NLS1 class. This parameter is also an important component of Boroson and Green’s optical “Eigenvector
Narrow-line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Early Data Release
We present a sample of 150 narrow-line Seyfert 1 galaxies (NLS1's) found within the Sloan Digital Sky Survey (SDSS) Early Data Release (EDR), only two of which were previously identified as such.
The unusual X-ray and optical properties of the ultrasoft active galactic nucleus Zwicky 159.034 (RE J1237+264)
Zwicky 159.034, one of the Seyfert galaxies identified with EUV sources detected during the ROSAT Wide Field Camera (WFC) all-sky survey, has unusual properties. The ROSAT Position Sensitive
A QSO survey via optical variability and zero proper motion in the M 92 field. III. Narrow emission line galaxies
We study a sample of 23 narrow-emission line galaxies (NELGs) which were selected by their strong variability as QSO candidates in the framework of a variability-and-proper motion QSO survey on
A Search for “Dwarf'' Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
We have completed an optical spectroscopic survey of the nuclear regions (r < 200 pc) of a large sample of nearby galaxies. Although the main objectives of the survey are to search for low-luminosity
Optical properties of active galaxies with ultra-soft X-ray spectra
The optical properties of a sample of 53 active galactic nuclei (AGN) which exhibit an ultra-soft X-ray excess are examined. These AGN have been identified as part of the Ultra-Soft Survey (USS)
X-Ray Observations of the Seyfert Galaxy LB 1727 (1H 0419–577)
We discuss the properties of the Seyfert 1.5 galaxy LB 1727, also known as 1H 0419-577, from X-ray observations obtained by ASCA and ROSAT, along with optical observations from earlier epochs. The
Follow-Up Hubble Space Telescope/Space Telescope Imaging Spectroscopy of Three Candidate Tidal Disruption Events*
Large-amplitude, high-luminosity, soft X-ray flares were detected by the ROSAT All-Sky Survey in several galaxies with no evidence for Seyfert activity in their ground-based optical spectra. These
...
1
2
3
4
5
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