229 datasets found

Keywords: seyfert galaxies

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  • The H{alpha} dots survey. II. 119 new dots

    We present the second catalog of serendipitously discovered compact extragalactic emission-line sources-H{alpha} Dots. These objects have been discovered in searches of...
  • Xinglong optical spectra of UGC3223 in 4 epochs

    The discovery of spectral type transition of active galactic nuclei (AGNs), the so-called "changing-look" (CL) phenomenon, challenges the widely accepted AGN paradigm, not only...
  • Photometric redshifts of emission-line galaxies

    Broadband photometric redshifts are routinely obtained for galaxies to estimate their distances. While effective for many uses, the common resolution in z of 0.01-0.02 is too...
  • Long-term Swift monitoring of WPVS 007

    We report on multi-wavelength observations of the X-ray transient Narrow Line Seyfert 1 (NLS1) galaxy WPVS007. The galaxy was monitored with Swift between 2005 October and 2013...
  • Properties of a sample of Seyfert 1 galaxies

    We present a statistical study of a large, homogeneously analyzed sample of narrow-line Seyfert 1 (NLS1) galaxies, accompanied by a comparison sample of broad-line Seyfert 1...
  • Emission-line objects from ALFALFA H{alpha} survey

    During a wide-field narrowband H{alpha} imaging survey, we noted the presence of numerous isolated emission-line point sources in the data. These objects could represent...
  • Matched SDSS and FIRST Sample

    The question as to whether the distribution of radio loudness in active galactic nuclei (AGNs) is actually bimodal has been discussed extensively in the literature. Furthermore,...
  • Morphology of narrow-line Seyfert 1 galaxies

    We present a study of the nuclear morphology of a sample of narrow- and broad-line Seyfert 1 galaxies (NLS1s and BLS1s, respectively) based on broadband images in the Hubble...
  • Narrow line Seyfert 1 galaxies in the FBQS

    We present results from the analysis of the optical spectra of 47 radio-selected narrow-line Seyfert 1 (NLS1) galaxies. These objects are a subset of the First Bright Quasar...
  • KISS H{alpha}-selected survey list 3

    The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey designed to detect extragalactic emission-line objects. It combines many of the features of...
  • 1.4GHz emission of KISS emission-line galaxies

    We have searched the Faint Images of the Radio Sky at Twenty centimeters (FIRST, ) and the NRAO VLA Sky Survey (NVSS, ) 1.4GHz radio surveys for sources that are coincident with...
  • KISS H{alpha} survey list 2

    The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless...
  • Seyfert population in SSRS2

    The magnitude-limited catalog of the Southern Sky Redshift Survey (SSRS2, Cat. ) is used to characterize the properties of galaxies hosting active galactic nuclei (AGNs). Using...
  • AGN in the KISS-RASS sample

    We present a study of the X-ray properties of a volume-limited sample of optically selected emission-line galaxies. The sample is derived from a correlation between the KPNO...
  • Narrow-line Seyfert 1 galaxies from SDSS EDR

    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) (Stoughton et al.,...
  • Quasars in the Coma cluster

    This is the second paper of the series about our Multiwavelength Quasar Survey. We present the observational results for the X-ray candidates in the field of the Coma Cluster....
  • KISS III. [O III]-selected survey list

    The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless...
  • KISS H{alpha} survey list 1

    The KPNO International Spectroscopic Survey (KISS) is a new objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless...
  • Rotation curves of Seyfert galaxies with companions

    This paper presents imaging and optical spectroscopy of paired Seyfert galaxies and their companions. The aim is to seek common properties of Seyfert galaxies in interacting...
  • AGNs with composite spectra. II.

    We have compiled from the literature 88 emission-line galaxies for which the published line-ratios give indication of a "transition spectrum"; selected objects are located north...
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