Results 21 to 30 of about 37,453 (224)

On the Heating of AGN Magnetospheres [PDF]

Universe, 2021
The Langmuir–Landau-Centrifugal Drive (LLCD), which can effectively “convert” gravitational energy into particles, is explored as a driving mechanism responsible for the extreme thermal luminosity acquired by some active galactic nuclei (AGN). For this purpose, we consider equations governing the process of heating of AGN magnetospheres. In particular,
Zaza Osmanov, Swadesh Mahajan
openaire   +3 more sources

Antifungal Activity of Angelica gigas with Enhanced Water Solubility of Decursin and Decursinol Angelate by Hot-Melt Extrusion Technology against Candida albicans

International Journal of Translational Medicine, 2022
Hot-melt extrusion (HME) has been an alternative technique to improve the solubility and bioavailability of active molecules with low water solubility.
Suji Ryu, Ha Yeon Lee, Seoul-Hee Nam, Jong-Suep Baek   +3 more
doaj   +1 more source

FUELING THE AGN [PDF]

, 2001
Active Galactic Nuclei are fueled from material (gas or stars) that are in general far away from the gravitational influence of the central black hole, the engine thought to be responsible for their activity. The required material has a lot of angular momentum, that is a priori quite difficult to evacuate. The various dynamical mechanisms that may play
openaire   +2 more sources

Beware of Fake AGNs [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractIn the BPT diagram, the distribution of the emission-line galaxies from the Sloan Digital Sky Survey (SDSS) evokes the wings of a seagull. Traditionally, galaxies in the right wing are considered to host AGNs. Our study of the stellar populations of SDSS galaxies showed that ~ 1/4 of galaxies thought to host LINERs are in fact “retired galaxies,
Stasinska, Grazyna, Vale Asari, Natalia, Cid Fernandes, Roberto   +2 more
openaire   +2 more sources

AGN-driven outflows in the early Universe [PDF]

, 2018
The origin of the tight correlations observed between the masses of supermassive black holes (SMBHs) and host galaxy properties is still debated. Negative feedback from AGN can provide a viable explanation for these correlations.
Balmaverde, B. (5918528), Brusa, M. (5191615), Feruglio, C. (5201881), Mainieri, V. (5201188), Risaliti, G., Mainieri, V., Feruglio, C., Fluetsch, A. (5950616), Venturi, G. (5289502), Piconcelli, E., Cresci, G., Cano-Diaz, M. (5950628), Schneider, R. (5252680), Piconcelli, E. (5191630), Fiore, F., Ohad, S., Cano-Diaz, M., Gallerani, S. (5898338), Netzer, H., Carniani, Stefano, Gallerani, S., Carniani, Stefano (5950613), Ohad, S. (5950619), Risaliti, G. (5200549), La Franca, F. (5192986), Comastri, A., Brusa, M., Nagao, T. (5950625), Mannucci, F. (5289505), Testi, L. (5950631), Fluetsch, A., Balmaverde, B., La Franca, F., Netzer, H. (5950622), Testi, L., Marconi, A. (5191618), Comastri, A. (5201179), Mannucci, F., Cresci, G. (5191627), Maiolino, R., Maiolino, R. (5901521), Ferrara, A., Cicone, C., Schneider, R., Ferrara, A. (5898335), Fiore, F. (5191621), Venturi, G., Sani, E., Sani, E. (5265454), Cicone, C. (5902361), Nagao, T., Marconi, A.   +51 more
core   +1 more source

Infrared observations of AGN [PDF]

Proceedings of the International Astronomical Union, 2004
We present results from an imaging and spectroscopic study of the dust properties of Seyfert galaxies in the 1-10um range. The data are compared to state of the art models of torus emission to constrain geometrical and physical properties of the obscuring medium.
Lira, P., Marin, F., Videla, L., Alonso-Herrero, A., Alexander, D. M., Ward, M.   +5 more
openaire   +2 more sources

AGN and their environment: a multi-wavelength photometric and spectroscopic study of AGN and galaxy clusters, and the co-evolution of AGN and the large scale structures [PDF]

, 2022
Active galactic nuclei (AGN) are the central engines hosted by most of the galaxies in the universe and are believed to be actively accreting supermassive black holes.
Mishra, Hora
core  

Principal Component‐Based Classification of Blazar Candidates of Uncertain Type in the 4FGL/LAT

Astronomische Nachrichten, EarlyView.
ABSTRACT We adopted principal component analysis (PCA), linear discriminant analysis (LDA), and support vector machines (SVM), to study classification for a sample of 2708 Fermi blazars: 1142 BL Lac objects (BLLs), 759 flat spectrum radio quasars (FSRQs), and 807 blazar candidates of uncertain type (BCUs).
Wen‐Xin Yang, Guo‐Hai Chen, Jing‐Tian Zhu, Hong‐Guang Wang, Denis Bastieri, Xu‐Hong Ye, Jing‐Chao Liang, De‐Xiang Wu, Jiang‐He Yang, Anton A. Strigachev, Rumen S. Bachev, Jun‐Jie Feng, Yi Liu, Jun‐Hui Fan   +13 more
wiley   +1 more source

The major merger–active galactic nucleus connection up to cosmic noon

Astronomy & Astrophysics
Galaxy major mergers are a potential mechanism for triggering active galactic nuclei (AGN) activity, but their role remains debated, particularly beyond the local Universe.
La Marca A., Margalef-Bentabol B., Wang L., Trager S. C., Rodriguez-Gomez V., Martin G.   +5 more
doaj   +1 more source

Direct SMBH Formation Driven by Runaway Stellar Collisions in Globally Unstable Stellar Systems

Astronomische Nachrichten, EarlyView.
ABSTRACT The fueling problem addresses the ultimate fate of the reservoirs of gas and stars driven into the deepest gravitational potential wells of galaxies, thus it may contain the Universe's densest concentrations of gas and stars. This raises a key question: does the infalling material collapse directly into a supermassive black hole, or can it ...
Marcelo C. Vergara, Andrés Escala
wiley   +1 more source