Results 21 to 30 of about 118,995 (201)

ASTROPHYSICAL FRACTALS: INTERSTELLAR MEDIUM AND GALAXIES [PDF]

, 2000
The interstellar medium is structured as a hierachy of gas clouds, that looks self-similar over 6 orders of magnitude in scales and 9 in masses. This is one of the more extended fractal in the Universe. At even larger scales, the ensemble of galaxies looks also self-similar over a certain ranges of scales, but more limited, may be over 3-4 orders of ...
openaire   +2 more sources

Compact jets as probes for sub-parsec scale regions in AGN

, 2007
Compact relativistic jets in active galactic nuclei offer an effective tool for investigating the physics of nuclear regions in galaxies. The emission properties, dynamics, and evolution of jets in AGN are closely connected to the characteristics of the ...
A. Celotti, A. Königl, A. Königl, A. Merloni, A. Pedlar, A.B. Peck, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Lobanov, A.P. Marscher, A.P. Marscher, A.P. Marscher, Andrei Lobanov, C.G. Mundell, D.J. Hutter, D.L. Meier, D.L. Meier, G.B. Field, H.C. Spruit, H.J. Lehto, H.R. Klöckner, I.V. Igumenschev, J.A. Zensus, J.E. Conway, J.F.C. Wardle, J.R. Goicoechea, K. Hirotani, M. Camenzind, M. Hujeirat, M. Sikora, M.J. Valtonen, N. Vlahakis, N.S. Kardashev, P.B. Ivanov, P.B. Ivanov, R.C. Walker, R.D. Blandford, R.D. Blandford, S. Koide, S.D. Bloom, S.S. Komissarov, S.V. Bogovalov, T.G. Arshakian, U. Bach, W. Junor   +49 more
core   +1 more source

X-rays from the environment of supermassive black holes in active galaxies [PDF]

, 2001
X-rays are a powerful probe of the physical conditions in the nuclei of active galaxies. We review the X-ray properties of radio-quiet AGN, LINERs and ultraluminous IR galaxies based on observations carried out with the X-ray satellite ROSAT.
Komossa, Stefanie
core   +3 more sources

Studies of Seyfert galaxies in Fesenkov Astrophysical Institute

Communications of the Byurakan Astrophysical Observatory, 2020
This article provides an overview of the main research results of a large group of Seyfert galaxies, carried out at Fesenkov Astrophysical Institute (FAI) over the past 50 years. Spectral observations have been performed since 1970. At an early stage, a three cascade image-tube (UM-92) was used as a radiation receiver.
E. Denissyuk, R. Valiullin, CH. Omarov, S. Shomshekova, M. Krugov, B. Omar   +5 more
openaire   +1 more source

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, EarlyView.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source

Are truncated stellar disks linked to the molecular gas density? [PDF]

, 2007
We know that the slope of the radial, stellar light distribution in galaxies is well described by an exponential decline and this distribution is often truncated at a break radius ($R_{br}$).
Bettoni, D., Casasola, V., Combes, F., Galletta, G., Pohlen, M., Tenaglia, F.   +5 more
core   +1 more source

The Science of Galaxy Formation [PDF]

, 2008
Our knowledge of the Universe remains discovery-led: in the absence of adequate physics-based theory, interpretation of new results requires a scientific methodology.
Gerard Gilmore, Leggatt
core   +1 more source

Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves

Astronomische Nachrichten, EarlyView.
ABSTRACT The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE).
Diego Calderón, Ondřej Pejcha, Brian D. Metzger, Paul C. Duffell, Stephan Rosswog   +4 more
wiley   +1 more source

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source