Results 21 to 30 of about 22,530 (230)

Jet Directions in Seyfert Galaxies [PDF]

The Astrophysical Journal, 2000
We present the study of the relative angle between the accretion disk (or radio jet) and the galaxy disk for a sample of Seyfert galaxies selected from a mostly isotropic property, the 60$ $m flux. For each galaxy we have a pair of points ($i$,$ $), which are the inclination of the galaxy relative to the line of sight and the angle between the jet ...
Kinney, A. L., Schmitt, H. R., Clarke, C. J., Pringle, J. E., Ulvestad, J. S., Antonucci, R. R. J.   +5 more
openaire   +2 more sources

Seyfert Galaxies [PDF]

Symposium - International Astronomical Union, 1972
The four Seyfert galaxies with systemic velocities of less than 2000 km s−1 have been observed at 21 cm with the Jodrell Bank 250-ft telescope and a 5 MHz overall bandwidth setting of the 256 channel auto-correlation spectrometer. Relatively strong signals of 0.5 f.u.
openaire   +1 more source

Spitzer/IRS Observations of Seyfert 1.8s and 1.9s: A Comparison with Seyfert 1s and Seyfert 2s [PDF]

, 2007
We present Spitzer Space Telescope mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 um region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and Seyfert 2 galaxies from the Spitzer archives.
Antonucci R., Clavel J., D. M. Crenshaw, H. Teplitz, Laurent O., M. Dietrich, M. Elitzur, R. P. Deo, S. B. Kraemer, Sturm E., T. J. Turner, Verma A.   +11 more
core   +3 more sources

Relativistic jets in narrow-line Seyfert 1 galaxies. New discoveries and open questions

EPJ Web of Conferences, 2013
Before the launch of the Fermi satellite only two classes of AGNs were known to produce relativistic jets and thus emit up to the γ-ray energy range: blazars and radio galaxies, both hosted in giant elliptical galaxies.
D’Ammando F., Orienti M., Finke J., Larsson J., Giroletti M.   +4 more
doaj   +1 more source

X-RAY VARIABILITY STUDY OF POLAR SCATTERED SEYFERT1 GALAXIES

Acta Polytechnica, 2014
We study 12 Seyfert 1 galaxies with a high level of optical polarization. Optical light emerging from the innermost regions is predominantly scattered in a polar region above the central engine directly in our line of sight.
Tobias Beuchert, Jörn Wilms, Matthias Kadler, Anna Lia Longinotti, Matteo Guainazzi, Giovanni Miniutti, Ignacio de la Calle   +6 more
doaj   +1 more source

Spitzer/IRS 5-35 um Low-Resolution Spectroscopy of the 12 um Seyfert Sample [PDF]

, 2009
We present low-resolution 5.5-35 um spectra for 103 galaxies from the 12 um Seyfert sample, a complete unbiased 12 um flux limited sample of local Seyfert galaxies selected from the IRAS Faint Source Catalog, obtained with the Infrared Spectrograph (IRS)
Antonucci, Armus, Armus, Bassani, Bernard-Salas, Brand, Brandl, Buchanan, Calzetti, Calzetti, Charmandaris, Clavel, Cohen, Contursi, Deo, Desai, Draine, Dudley, Efstathiou, Engelbracht, Farrah, Genzel, Gorjian, Hao, Hao, Hao, Houck, Houck, Houck, Jiasheng Huang, Laurent, Le Floc'h, Luigi Spinoglio, Lutz, Maiolino, Markwardt, Meléndez, Meléndez, Nardini, Nenkova, Peeters, Sajina, Sanders, Schaerer, Shi, Shu, Silvia Tommasin, Sirocky, Smith, Spoon, Stern, Sturm, Sturm, Teplitz, Thompson, Tommasin, Vassilis Charmandaris, Voit, Weedman, Weedman, Weedman, Werner, Wu, Yan, Yanling Wu   +64 more
core   +3 more sources

Seyfert galaxies and BeppoSAX [PDF]

Nuclear Physics B - Proceedings Supplements, 1999
The contributions that BeppoSAX is expected to give and, after one and a half year of operation, has already given to our knowledge of both type 1 and type 2 Seyfert galaxies are outlined and reviewed.
openaire   +3 more sources

On black hole masses, radio-loudness and bulge luminosities of Seyfert galaxies [PDF]

, 2001
We estimated black hole masses for 9 Seyfert 1 and 13 Seyfert 2 galaxies in the Palomar and CfA bright Seyfert samples using the tight correlation between black hole mass and bulge velocity dispersion.
Adams, Begelman, Blandford, Blandford, Blundell, Boller, Boroson, Di Matteo, Dunlop, Faber, Faber, Fabian, Falcke, Falcke, Ferrarese, Ferrarese, Franceschini, Gebhardt, Gebhardt, Genzel, Ghez, Haehnelt, Haehnelt, Haiman, Ho, Ho, Ho, Ho, Ho, Huchra, Huchra, J. L. Han, Kaspi, Kaspi, Kauffmann, Kormendy, Krolik, Kukula, Kukula, Laor, Laor, Laor, Lyden-Bell, Magorrian, Mathur, Merritt, Nelson, Nelson, Osterbrock, Rees, Sadler, Sadler, Schmidt, Shakura, Silk, Simien, Véron, Wandel, Wandel, Wang, Whittle, Worthey, Xue-Bing Wu   +62 more
core   +3 more sources

The Multitude of Unresolved Continuum Sources at 1.6 microns in Hubble Space Telescope images of Seyfert Galaxies [PDF]

, 1999
We examine 112 Seyfert galaxies observed by the Hubble Space Telescope (HST) at 1.6 microns. We find that ~50% of the Seyfert 2.0 galaxies which are part of the Revised Shapeley-Ames (RSA) Catalog or the CfA redshift sample contain unresolved continuum ...
A. Alonso‐Herrero, A. C. Quillen, Alloin D., Alonso-Herrero A., Alonso-Herrero A., Antonucci R. R. J., Ariane Lee, Colleen McDonald, Fioc M., G. H. Rieke, Glass I. S., Gonzalez-Delgado R. M., Keel W. C., M. J. Rieke, Richstone D., Shanna Shaked, Terlevich R., Veron-Cetty M.-P., Wandel A.   +18 more
core   +5 more sources

Classifying Seyfert Galaxies with Deep Learning [PDF]

The Astrophysical Journal Supplement Series, 2021
Abstract 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 line. One algorithm of deep learning is the convolution neural network (CNN), which has shown successful classification results.
openaire   +2 more sources