Results 21 to 30 of about 80,758 (270)

The Rapid Optical Variability of the Nearby Radio-loud AGN Pictor A: Introducing the Quaver Pipeline for AGN Science with TESS

The Astrophysical Journal, 2023
The sampling strategy of the Transiting Exoplanet Survey Satellite (TESS) makes TESS light curves extremely valuable for investigating the high cadence optical variability of active galactic nuclei (AGN).
Krista Lynne Smith, Lia F. Sartori
doaj   +1 more source

Active galactic nuclei at z ~ 1.5: III. Accretion discs and black hole spin [PDF]

, 2016
This is the third paper in a series describing the spectroscopic properties of a sample of 39 AGN at $z \sim 1.5$, selected to cover a large range in black hole mass ($M_{BH}$) and Eddington ratio ($L/L_{Edd}$). In this paper, we continue the analysis of
Capellupo, Daniel M., Lira, Paulina, Mejía-Restrepo, Julián, Netzer, Hagai, Trakhtenbrot, Benny   +4 more
core   +2 more sources

JETTED ACTIVE GALACTIC NUCLEI [PDF]

International Journal of Modern Physics: Conference Series, 2012
Most of the electromagnetic output of blazars (BL Lac objects and Flat Spectrum Radio Quasars) comes out in the γ–ray band, making the Large Area Telescope [0.1–100 GeV] onboard the Fermi satellite and the Cherenkov telescopes crucial for gather crucial data and thus to understand their physics.
openaire   +2 more sources

Megamaser Disks in Active Galactic Nuclei [PDF]

, 1998
Recent spectroscopic and VLBI-imaging observations of bright extragalactic water maser sources have revealed that the megamaser emission often originates in thin circumnuclear disks near the centers of active galactic nuclei (AGNs).
Abraham Z., Antonucci R., Arav N., Arieh Konigl, Blandford R. D., Brown P. D., Fiebig D., Genzel R., Greenhill L. J., Greenhill L. J., Hagiwara Y., Hawarden T. G., Herrnstein J. R., John F. Kartje, Matveenko L. I., Moshe Elitzur, Nakai N., Pringle J. E., Pringle J. E., Pringle J. E., Schandl S., Shakura N. I.   +21 more
core   +4 more sources

BASS. XXVIII. Near-infrared Data Release 2: High-ionization and Broad Lines in Active Galactic Nuclei

The Astrophysical Journal Supplement Series, 2022
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 all-sky Swift Burst Array Telescope X-ray survey observed with the Very Large ...
Jakob S. den Brok, Michael J. Koss, Benny Trakhtenbrot, Daniel Stern, Sebastiano Cantalupo, Isabella Lamperti, Federica Ricci, Claudio Ricci, Kyuseok Oh, Franz E. Bauer, Rogerio Riffel, Alberto Rodríguez-Ardila, Rudolf Bär, Fiona Harrison, Kohei Ichikawa, Julian E. Mejía-Restrepo, Richard Mushotzky, Meredith C. Powell, Rozenn Boissay-Malaquin, Marko Stalevski, Ezequiel Treister, C. Megan Urry, Sylvain Veilleux   +22 more
doaj   +1 more source

Dust Emission from Active Galactic Nuclei [PDF]

, 2002
Unified schemes of active galactic nuclei (AGN) require an obscuring dusty torus around the central source, giving rise to Seyfert 1 line spectrum for pole-on viewing and Seyfert 2 characteristics in edge-on sources.
Antonucci R., Clavel J., Granato G. L., Maia Nenkova, Moshe Elitzur, Roche P. F., Rowan-Robinson M., Željko Ivezić   +7 more
core   +4 more sources

Two-temperature coronae in active galactic nuclei [PDF]

, 1997
We show that coronal magnetic dissipation in thin active sheets that sandwich standard thin accretion disks in active galactic nuclei may account for canonical electron temperatures of a few $\times 10^9$K if protons acquire most of the dissipated energy.
Blackman, E. G., Di Matteo, T., Fabian, A. C.   +2 more
core   +3 more sources

Broad iron lines in Active Galactic Nuclei [PDF]

, 2000
An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler effect and gravitational redshift.
A. J. Young, Antonucci R., C. S. Reynolds, Dabrowski Y., Fabian A. C., Fabian A. C., Fanton C., George I. M., Ghisellini G., Gierlinski M., Grandi P., Guainazzi M., Guainazzi M., Guilbert P. W., Iwasawa K., Iwasawa K., K. Iwasawa, Kormendy J., Makishima K., Martocchia A., Matt G., Matt G., Matt G., Matt G., Mushotzky R. F., Nandra K., Nandra K., Nishiura S., Otani C., Revnivtsev M., Reynolds C. S., Reynolds C. S., Reynolds C. S., Ross R. R., Ross R. R., Shakura N. L., Vainshtein L. A., Zdziarski A. A.,  A. C. Fabian   +38 more
core   +3 more sources

NuSTAR Observations of a Heavily X-Ray-obscured AGN in the Dwarf Galaxy J144013+024744

The Astrophysical Journal, 2023
We present a multiwavelength analysis of the dwarf Seyfert 2 galaxy J144013+024744, a candidate obscured active galactic nucleus (AGN) thought to be powered by an intermediate-mass black hole (IMBH, M _• ≈ 10 ^4 −10 ^6 M _⊙ ) of mass M _• ∼ 10 ^5.2 M _⊙ .
Shrey Ansh, Chien-Ting J. Chen, W. N. Brandt, Carol E. Hood, E. S. Kammoun, G. Lansbury, Stéphane Paltani, Amy E. Reines, C. Ricci, Douglas A. Swartz, Jonathan R. Trump, F. Vito, Ryan C. Hickox   +12 more
doaj   +1 more source

Environmental Effects on Local Active Galactic Nuclei [PDF]

, 1994
Using an extensive sample of nearby galaxies (the Nearby Galaxies Catalog, by Tully), we investigate the environment of the galaxies hosting low-luminosity AGNs (Seyferts and LINERs).
Giuricin, Giuliano, Mardirossian, Fabio, Mezzetti, Marino, Monaco, Pierluigi   +3 more
core   +2 more sources