231 datasets found

Keywords: seyfert galaxies

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  • X-ray sources in the AKARI NEP deep field

    We present data products from the 300ks Chandra survey in the AKARI North Ecliptic Pole (NEP) deep field. This field has a unique set of 9-band infrared photometry covering 2-24...
  • Subarcsecond mid-infrared atlas of local AGN

    We present the first subarcsecond-resolution mid-infrared (MIR) atlas of local active galactic nuclei (AGN). Our atlas contains 253 AGN with a median redshift of z=0.016, and...
  • PKS 0558-504 UVOT and XRT monitoring

    PKS 0558-504 is a highly-variable, X-ray-bright, radio-loud, narrow-line Seyfert 1 galaxy with super-Eddington accretion rate and extended jets that do not dominate the emission...
  • Type 1 AGN at low z. III.

    We present the optical narrow-line ratios in a Sloan Digital Sky Survey (SDSS) based sample of 3175 broad H{alpha} selected type 1 active galactic nuclei (AGN), and explore...
  • Mrk 6 H{alpha}, H{beta} and H{gamma} spectra

    We present the results of optical spectral and photometric observations of the nucleus of Markarian 6 made with the 2.6-m Shajn telescope at the Crimean Astrophysical...
  • FeK lines in Seyfert 1 galaxies

    We construct full broad-band models in an analysis of Suzaku observations of nearby Seyfert 1 active galactic nuclei (AGN) (z<=0.2) with exposures >50ks and with greater...
  • Emission-line properties of Seyfert 2 nuclei

    This is the third paper of a series devoted to the study of the global properties of Joguet's sample (2001A&A...380...19J) of 79 nearby galaxies observable from the southern...
  • Optical spectral atlas of Seyfert nuclei

    We present an optical spectral atlas of the nuclear region (generally 2"x4", or r=<200pc) of a magnitude-limited survey of 486 nearby galaxies having B_T_=<12.5mag and...
  • Universidad Complutense de Madrid list 1

    A low dispersion objective-prism survey for low-redshift emission-line galaxies (ELGs) is being carried out by the University Complutense de Madrid with the Schmidt telescope at...
  • Survey of bare z<0.2 AGNs. I. X-ray soft excess

    We analyze a sample of 21 "bare" Seyfert 1 active galactic nuclei, a subclass of Seyfert 1 galaxies, with intrinsic absorption N_H_~10^20^cm^-2^, in the local Universe...
  • BASS. XXIX. NIR view of broad-line regions

    Virial black hole (BH) mass (MBH) determination directly involves knowing the broad-line region (BLR) clouds' velocity distribution, their distance from the central supermassive...
  • BASS. XXVIII. NIR DR2 sp. of nearby Swift AGNs

    We present the BAT AGN Spectroscopic Survey (BASS) Near-infrared Data Release 2 (DR2), a study of 168 nearby (\bar{z}=0.04, z<0.6) active galactic nuclei (AGN) from the...
  • BASS. XXVI. DR2 stellar velocity dispersions

    We present new central stellar velocity dispersions for 484 Sy 1.9 and Sy 2 from the second data release of the Swift/BAT AGN Spectroscopic Survey (BASS DR2). This constitutes...
  • BASS. XXIV. DR2 spectral line measurements of AGNs

    We present the second catalog and data release of optical spectral line measurements and active galactic nucleus (AGN) demographics of the BAT AGN Spectroscopic Survey, which...
  • BASS. XXII. The Swift/BAT AGN Sp. Survey DR2 cat.

    We present the active galactic nucleus (AGN) catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2). With this DR2...
  • Properties of ICRF3 sources from SDSS spectra

    Despite their importance for astrometry and navigation, the active galactic nuclei (AGNs) that comprise the International Celestial Reference Frame (ICRF) are relatively poorly...
  • Iron template spectrum from Mrk493 HST/STIS obs.

    We present a new empirical template for iron emission in active galactic nuclei (AGNs) covering the 4000-5600{AA} range. The new template is based on a spectrum of the...
  • SDSS Seyfert 1.9 galaxies with Ha emission line fit

    The traditional classification for a subclass of the Seyfert galaxies is visual inspection or using a quantity defined as a flux ratio between the Balmer line and forbidden...
  • WISE MIR variability in gamma-ray Seyfert 1 gal.

    Fermi-LAT's detection of {gamma}-rays from narrow-line Seyfert 1 galaxies (NLS1s) has received increasing attention. Understanding these {gamma}-NLS1s is of interest because...
  • SEAMBHs XII. Reberberation mapping for 15 PG QSOs

    In this work, we present the first results of the long-term high-cadence spectroscopic monitoring of 15 PG quasars with relatively strong FeII emission, as a part of a broader...
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