Results 61 to 70 of about 152,801 (176)

Jetted Narrow-Line Seyfert 1 Galaxies & Co.: Where Do We Stand?

Universe, 2020
The discovery in 2008 of high-energy gamma-rays from Narrow-Line Seyfert 1 Galaxies (NLS1s) made it clear that there were active galactic nuclei (AGN) other than blazars and radio galaxies that can eject powerful relativistic jets.
Luigi Foschini
doaj   +1 more source

IRAS observations of Seyfert galaxies [PDF]

, 1985
Infrared Astronomy Satellite measurements at 25, 60 and 100 microns were used to analyze the infrared properties of Seyfert galaxies from the Markarian and NGC Catalogs. One hundred and sixteen of 186 Seyfert galaxies were detected.
Miley, G. K., Neugebauer, G., Soifer, B. T.   +2 more
core  

Mid-infrared Ensemble Variability of Broad-line and Narrow-line Seyfert 1 Galaxies

The Astrophysical Journal
We utilized multiepoch archival data from the Wide-field Infrared Survey Explorer to compare the variability at 3.4 μ m (W1 band) and 4.6 μ m (W2 band) of broad-line Seyfert 1 (BLSy1) galaxies and narrow-line Seyfert 1 (NLSy1) galaxies by employing the ...
Zhipeng Hu, Lisheng Mao
doaj   +1 more source

Chemical evolution of Seyfert galaxies

, 2008
We computed the chemical evolution of Seyfert galaxies, residing in spiral bulges, based on an updated model for the Milky Way bulge with updated calculations of the Galactic potential and of the feedback from the central supermassive black hole (BH ...
CIOTTI, LUCA, Francesca Matteucci, S. K. Ballero, F. Matteucci, Silvia K. Ballero, Luca Ciotti   +5 more
core   +2 more sources

H.E.S.S. observations of composite Seyfert–starburst galaxies

Astronomy & Astrophysics
Context. Composite galaxies that contain both Seyfert and starburst components may produce very high-energy (VHE; > 100 GeV) γ-ray emission at a wide range of spatial scales, from a few Schwarzschild radii of a supermassive black hole (SMBH; RS = 10−6 pc
Acharyya A., Aharonian F., Ashkar H., Backes M., Barbosa Martins V., Batzofin R., Becherini Y., Berge D., Böttcher M., Boisson C., Bolmont J., Borowska J., Brun F., Bruno B., Burger-Scheidlin C., Casanova S., Celic J., Cerruti M., Chandra S., Chen A., Chernyakova M., Chibueze J. O., Chibueze O., Colafrancesco S., Collins T., Cornejo B., Cotter G., Damascene Mbarubucyeye J., de Assis Scarpin J., de Bony de Lavergne M., de Naurois M., de Oña Wilhelmi E., Delgado Giler A. G., Djannati-Ataï A., Djuvsland J., Dmytriiev A., Ebrahim R., Egg K., Escañuela Nieves C., Feijen K., Filipovic M. D., Fontaine G., Funk S., Gabici S., Glicenstein J. F., Glombitza J., Goswami P., Grondin M.-H., Hess B., Hinton J. A., Holch T. L., Holler M., Horns D., Jamrozy M., Jankowsky F., Jung-Richardt I., Kasai E., Kasprzak K., Katarzyński K., Kerszberg D., Khélifi B., Komin N., Kosack K., Kostunin D., Lang R. G., Lazarević S., Lefranc V., Lenain J.-P., Liniewicz P., Luashvili A., Mackey J., Malyshev D., Malyshev D., Marandon V., Marchegiani P., Mayer M., Mehta A., Mitchell A. M. W., Moderski R., Moghadam M. O., Mohrmann L., Moulin E., Niemiec J., O’Brien P., Olivera-Nieto L., Panny S., Panter M., Parsons R. D., Pensec U., Prokhorov D. A., Pühlhofer G., Punch M., Quirrenbach A., Regeard M., Reimer A., Reimer O., Ren H., Rieger F., Rudak B., Sabri K., Sahakian V., Salzmann H., Sasaki M., Schüssler F., Shapopi J. N. S., Si Said W., Spencer S., Stawarz Ł., Steinmassl S., Tanaka T., Taylor A. M., Terrier R., Tsirou M., Unbehaun T., van Eldik C., Vecchi M., Venter C., Vink J., Wach T., Wierzcholska A., Zech A., Zhong W.   +121 more
doaj   +1 more source

The Impact of Seyfert Jets on Galaxy Evolution across Major Scaling Relations

The Astrophysical Journal
We analyze a suite of high-resolution cosmological zoom-in simulations of jetted Seyfert galaxies over z < ∼10 projected on the major scaling relations, comparing trajectories of “normal” versus jet-hosting galaxies. Models include thermal and mechanical
Julianne Goddard, Isaac Shlosman, Emilio Romano-Diaz   +2 more
doaj   +1 more source

Gas Motion Mapping for Three Seyfert Galaxies

Open Astronomy, 2011
We report the preliminary results of a kinematical study of three Seyfert galaxies selected from a sample of nearby active galactic nuclei observed using 3D spectroscopy.
Smirnova A., Moiseev A., Katkov I., Afanasiev V.   +3 more
doaj   +1 more source

Very high energy gamma-ray emission of NGC 1275 and 3c382 and the possible activity nature of the Seyfert Galaxies

EPJ Web of Conferences, 2013
Galaxy NGC 1275 is the central dominant galaxy of the Perseus Cluster of Galaxies and is of Seyfert galaxy class. NGC 1275 is known as powerful X-ray and radio source.
Sinitsyna V.Y., Sinitsyna V.G.
doaj   +1 more source

Mapping the dynamics, star-formation rates, and chemical properties of galaxies with integral field spectroscopy [PDF]

, 2005
Major advances in the development of instruments for eight and ten meter class telescopes are revolutionising our understanding of galaxy formation. In particular, Integral Field Spectrographs (which produce a three dimensional {x, y, velocity) map of a ...
Swinbank, Anthony Mark, Swinback, Anthony Mark   +1 more
core  

Neutrino signal from Seyfert galaxies [PDF]

International audienceIceCube collaboration has previously reported an evidence for neutrino signal from a Seyfert galaxy NGC 1068. This may suggest that all Seyfert galaxies emit neutrinos.
Neronov, Andrii, Semikoz, D.V, Savchenko, D, Semikoz, D. V., Savchenko, D., Neronov, A., Neronov, A   +6 more
core   +1 more source