Results 31 to 40 of about 55,540 (200)

Black holes in astrophysics

New Journal of Physics, 2005
To appear in a forthcoming Special Focus Issue on "Spacetime 100 Years Later" published by the New Journal of Physics (http://www.iop.org/EJ/njp) The article, finalized in October, 2004, consists of 21 pages of text, 3 figures and 6 movies (found at http://www.cfa.harvard.edu/~narayan/NJP)
openaire   +3 more sources

Black Holes: from Speculations to Observations [PDF]

, 2006
This paper provides a brief review of the history of our understanding and knowledge of black holes. Starting with early speculations on ``dark stars'' I discuss the Schwarzschild "black hole" solution to Einstein's field equations and the development of
Baumgarte, Thomas W.
core   +2 more sources

Ergoregion instability of black hole mimickers [PDF]

, 2008
Ultra-compact, horizonless objects such as gravastars, boson stars, wormholes and superspinars can mimick most of the properties of black holes. Here we show that these "black hole mimickers" will most likely develop a strong ergoregion instability when ...
Cadoni, Mariano, Cardoso, Vitor, Cavaglia, Marco, Pani, Paolo   +3 more
core   +3 more sources

The astrophysical science case for a decihertz gravitational-wave detector

, 2017
We discuss the astrophysical science case for a decihertz gravitational-wave mission. We focus on unique opportunities for scientific discovery in this frequency range, including probes of type IA supernova progenitors, mergers in the presence of third ...
Mandel, Ilya, Sesana, Alberto, Vecchio, Alberto   +2 more
core   +1 more source

Accretion disks around black holes in modified strong gravity [PDF]

, 2012
Stellar-mass black holes offer what is perhaps the best scenario to test theories of gravity in the strong-field regime. In particular, f(R) theories, which have been widely discuss in a cosmological context, can be constrained through realistic ...
Bergliaffa, Santiago E. Perez, Pérez, Daniela, Romero, Gustavo E.   +2 more
core   +2 more sources

Astrophysical Black Holes: Overview [PDF]

Progress of Theoretical Physics Supplement, 2004
Recent progress in understanding the nature of astrophysical black holes is briefly reviewed. Special attentions are paid on the comparison of various classes of astrophysical black holes and the non-standard type models of accretion flow onto black holes, including near-critical accretion flow (slim-disk) model and magnetohydrodynamical (MHD) flow ...
openaire   +1 more source

How a Klein–Nishina Modified Eddington-limited Accretion Explains Rapid Black Hole Growth in the Early Universe

The Astrophysical Journal
The discovery of quasars and their supermassive black holes (SMBHs) over 10 ^9 ${M}_{{\rm{\odot }}}$ merely hundreds of millions of years after the Big Bang generates tension with the idea of Eddington-limited accretion and pressures the community into ...
Jackson Frangos, Erick Rosen, Michael Williams, Chandra B. Singh, David Garofalo   +4 more
doaj   +1 more source

Menus for Feeding Black Holes

, 2013
Black holes are the ultimate prisons of the Universe, regions of spacetime where the enormous gravity prohibits matter or even light to escape to infinity.
A. Burrows, A. Escala, A. Heger, A. Loeb, A.I. MacFadyen, A.P. Schoenmakers, B. Carter, B. Kocsis, B. Kocsis, B. Kocsis, B. Kocsis, B. Kocsis, B. McKernan, B.A. Fryxell, C. Rodriguez, C. Roedig, C.D. Dermer, C.L. Fryer, D. Merritt, D.N. Burrows, E.C. Ostriker, F. Civano, F. De Colle, F. Hoyle, F. Pretorius, F.D. Lora-Clavijo, F.K. Liu, F.K. Liu, G. Bertone, G. Bertone, G. Fabbiano, G. Lodato, G. Lodato, H. Baumgardt, H. Bondi, H. Bondi, H. Sudou, H.-J. Grimm, I. Mandel, I.D. Novikov, J. Binney, J. Cuadra, J. Frank, J. Goodman, J. Goodman, J. Guilet, J. Guillochon, J. Miralda-Escudé, J. Wang, J.-M. Shi, J.A. Regan, J.G. Baker, J.M. Blondin, J.M. Blondin, J.S.B. Wyithe, J.S.B. Wyithe, J.S.B. Wyithe, K. Belczynski, K. Hayasaki, K. Kotake, K. Nakayama, K.A. Postnov, K.S. Thorne, L. Ballo, L. Blecha, L.E. Strubbe, L.L. Cowie, M. Campanelli, M. Dijkstra, M. Eracleous, M. Freitag, M. Kesden, M. Kesden, M. MacLeod, M. Milosavljević, M. Ruffert, M. Ruffert, M. Saijo, M. Ugliano, M.C. Begelman, M.C. Begelman, M.C. Miller, M.J. Rees, M.J. Rees, M.P. Muno, M.R. Krumholz, M.R. Krumholz, N. Roos, N. Soker, N. Soker, N. Stone, N. Stone, N. Webb, N.I. Shakura, O. Zanotti, P. Goldreich, P. Madau, P. Madau, P. Ranalli, P.B. Ivanov, P.C. Fragile, R. Fernández, R. Haas, R. Narayan, R. Narayan, R. Narayan, R.M. O’Leary, R.M. O’Leary, R.M. O’Leary, R.N. Lang, S. Bianchi, S. Chandrasekhar, S. Gezari, S. Komossa, S. Komossa, S. Mineo, S. Rosswog, S. van Velzen, S.B. Cenko, S.C. Noble, S.F. Portegies Zwart, S.F. Portegies Zwart, S.L. Shapiro, S.L. Shapiro, S.W. Davis, T. Foglizzo, T. Foglizzo, T. Tanaka, U. Anzer, V. Bromm, V. Bromm, V. Paschalidis, X. Chen, Y. Levin, Y. Rephaeli, Y. Shen, Z. Haiman   +136 more
core   +1 more source

Commissioning an Inexpensive Off‐The‐Shelf Spectrograph for Radial‐Velocity Studies

Astronomische Nachrichten, EarlyView.
ABSTRACT We present a way to set up an inexpensive out of the shelf spectrograph at a local observatory. Stability and resolution of the spectrograph are high enough for radial velocity determination of binary stars or determination of stellar characteristics. Even some exoplanets might be detectable via the radial velocity method.
Lukas Stock, Andreas Schrimpf
wiley   +1 more source

Testing Ghasemi-Nodehi–Bambi spacetime with continuum-fitting method

European Physical Journal C: Particles and Fields, 2020
The continuum-fitting method is the analysis of the thermal spectrum of the geometrically thin and optically thick accretion disk around stellar-mass black holes.
M. Ghasemi-Nodehi
doaj   +1 more source