Results 81 to 90 of about 6,380 (236)

A Panchromatic View of Relativistic Jets in Narrow-Line Seyfert 1 Galaxies

Galaxies, 2016
The discovery by the Large Area Telescope on board Fermi of variable γ-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1) galaxies revealed the presence of a possible third class of Active Galactic Nuclei (AGN) with relativistic jets in addition ...
Filippo D’Ammando, Monica Orienti, Justin Finke, Josefin Larsson, Marcello Giroletti, Claudia M. Raiteri   +5 more
doaj   +1 more source

Modeling Star Formation Histories of Changing-look AGN Host Galaxies with Prospector

The Astrophysical Journal
Changing-look active galactic nuclei (CL-AGNs), are AGNs that appear to transition between Seyfert Type 1 and 2 over periods of months to years. Several mechanisms to trigger these transitions have been proposed, but we have yet to conclusively determine
Margaret E. Verrico, K. Decker French, Katherine A. Suess, Tanay Agrawal, Lauranne Lanz, Yuanze Luo, Pallavi Patil, Kate Rowlands, Margaret Shepherd, Maya Skarbinski   +9 more
doaj   +1 more source

Narrow-Line Seyfert 1 Galaxies

, 2007
To appear in the proceedings of "The nuclear region, host galaxy and environment of AGN", E. Benitez, I. Cruz-Gonzalez & Y.
openaire   +3 more sources

COMPTEL upper limits for Seyfert galaxies

AIP Conference Proceedings, 1994
The gamma‐ray emission of Seyfert galaxies has fallen far short of pre‐GRO expectations. No single object of this class has been detected by either COMPTEL or EGRET, and OSSE has detected only a fraction of the Seyferts expected. To derive a more stringent upper limit to the emission from these objects in the energy ranges 0.75 to 1 and 1 to 3 MeV, we ...
Maisack, M, Collmar, W, Lichti, G G, Schonfelder, V, Steinle, H, Bloemen, H, Hermsen, W, McConnell, Mark L, Stacy, G, Barr, P, Williams, O R   +10 more
openaire   +4 more sources

Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies

Galaxies, 2019
Before the launch of the Fermi Gamma-ray Space Telescope satellite only two classes of active galactic nuclei (AGN) were known to generate relativistic jets and thus to emit up to the γ -ray energy range: blazars and radio galaxies, both hosted
Filippo D’Ammando
doaj   +1 more source

Intensive Broadband Reverberation Mapping of Fairall 9 with 1.8 yr of Daily Swift Monitoring

The Astrophysical Journal
We present 1.8 yr of near-daily Swift monitoring of the bright, strongly variable Type 1 active galactic nucleus (AGN) Fairall 9. Totaling 575 successful visits, this is the largest such campaign reported to date.
R. Edelson, B. M. Peterson, J. Gelbord, K. Horne, M. Goad, I. McHardy, S. Vaughan, M. Vestergaard   +7 more
doaj   +1 more source

The globular cluster system of the nearest Seyfert II galaxy Circinus [PDF]

, 2022
C. Obasi, M. Gómez, D. Minniti, J. Alonso-García, M. Hempel, J. B. Pullen, M. D. Gregg, Laura D Baravalle, M. V. Alonso, B. I. Okere   +9 more
openalex   +1 more source

Observations of a Magellanic Corona. [PDF]

Nature, 2022
Krishnarao D, Fox AJ, D'Onghia E, Wakker BP, Cashman FH, Howk JC, Lucchini S, French DM, Lehner N.   +8 more
europepmc   +1 more source

Star formation efficiency and AGN feedback in narrow-line Seyfert 1 galaxies with fast X-ray nuclear winds [PDF]

, 2023
Q. Salomé, Y. Krongold, A. L. Longinotti, M. Bischetti, S. García‐Burillo, O. Vega, M. Sánchez‐Portal, C. Feruglio, María J. Jiménez-Donaire, M. V. Zanchettin   +9 more
openalex   +1 more source

Modeling Cosmological Evolution of Jetted Seyfert Galaxies for z ≲ 10

The Astrophysical Journal
We use high-resolution cosmological zoom-in simulations to model mechanical and thermal feedback from active galactic nuclei onto the evolution of Seyfert-type galaxies, studying the morphology of central galaxies growing within dark matter (DM) halos ...
Julianne Goddard, Isaac Shlosman, Emilio Romano-Diaz   +2 more
doaj   +1 more source