229 datasets found

Keywords: seyfert galaxies

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  • 3.6um, 4.5um, B and V light curves of NGC 6418

    We present results from a 15 month campaign of high-cadence (~3 days) mid-infrared Spitzer and optical (B and V) monitoring of the Seyfert 1 galaxy NGC 6418, with the objective...
  • 1H 0323+342 rest frame optical spectrum with GHAO

    We present optical and near-infrared (NIR) imaging data of the radio-loud, narrow-line Seyfert 1 galaxy 1H 0323+342, which shows intense and variable gamma-ray activity...
  • Reverberation mapping of the Seyfert 1 NGC 7469

    A large reverberation-mapping study of the Seyfert 1 galaxy NGC 7469 has yielded emission-line lags for H{beta} {lambda}4861 and He II {lambda}4686 and a central black hole mass...
  • LOFAR Bootes and 3C295 field sources

    We present Low Frequency Array (LOFAR) Low Band observations of the Bootes and 3C 295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy/beam,...
  • MIR-selected quasar parameters

    We provide a catalog of 391 mid-infrared-selected (MIR; 24 {mu}m) broad-emission-line (BEL; type 1) quasars in the 22 deg^2^ SWIRE Lockman Hole field. This quasar sample is...
  • X-ray through NIR photometry of NGC 2617

    After the All-Sky Automated Survey for SuperNovae discovered a significant brightening of the inner region of NGC 2617, we began a ~70 day photometric and spectroscopic...
  • 17 Seyfert 1 galaxies light curves

    We present the results of a dust reverberation survey for 17 nearby Seyfert 1 galaxies, which provides the largest homogeneous data collection for the radius of the innermost...
  • IRTF J-band spectrum of Mrk 231

    We present the first J-band spectrum of Mrk 231, which reveals a large He I {lambda}10830 broad absorption line with a profile similar to that of the well-known Na I broad...
  • SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333

    We report first results from a large project to measure black hole (BH) mass in high accretion rate active galactic nuclei (AGNs). Such objects may be different from other AGNs...
  • Reverberation mapping for five Seyfert 1 galaxies

    We present the results from a detailed analysis of photometric and spectrophotometric data on five Seyfert 1 galaxies observed as a part of a recent reverberation mapping...
  • New Fermi/LAT extragalactic sources

    We present the analysis of 2.1 years of Fermi Large Area Telescope (LAT) data on 491 Seyfert galaxies detected by the Swift Burst Alert Telescope (BAT) survey. Only the two...
  • The [OIII] emission line in SDSS AGNs

    We use homogeneous samples of radio-quiet Seyfert 1 galaxies and QSOs selected from the Sloan Digital Sky Survey to investigate the connection between the velocity shift and the...
  • AGN pairs from SDSS-DR7. I.

    Galaxy-galaxy mergers and close interactions have long been regarded as a viable mechanism for channeling gas toward the central supermassive black holes (SMBHs) of galaxies...
  • The Megamaser Cosmology Project (MCP). III.

    Observations of H_2_O masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project (MCP) allow accurate measurement of the mass of supermassive black...
  • X-ray properties of Seyfert 1 galaxies

    We use publicly available XMM-Newton data to systematically compare the hard X-ray photon indices, {Gamma}2-10keV, and the iron K{alpha} emission lines of narrow- and broad-line...
  • Seyfert galaxies in the mid-IR

    An analysis of archival mid-infrared (mid-IR) spectra of Seyfert galaxies from the Spitzer Space Telescope observations is presented. We characterize the nature of the mid-IR...
  • H{beta} and V-band light curves of NGC 4051

    We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from...
  • COSMOS AGN spectroscopic survey. I.

    We present optical spectroscopy for an X-ray and optical flux-limited sample of 677 XMM-Newton selected targets covering the 2deg^2^ Cosmic Evolution Survey field, with a yield...
  • Search for megamasers in type-2 AGNs

    We report a search for H_2_O megamasers in 274 SDSS type-2 active galactic nuclei (AGNs; 0.3<z<0.83), half of which can be classified as type-2 quasi-stellar objects...
  • Chandra X-ray sources of NGC 1068

    We present an analysis of the compact X-ray source population in the Seyfert 2 galaxy NGC 1068, imaged with a 50ks Chandra observation. We find a total of 84 compact sources on...
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