Results 81 to 90 of about 168,088 (243)

Relativistic Suppression of Black Hole Recoils [PDF]

, 2010
Numerical-relativity simulations indicate that the black hole produced in a binary merger can recoil with a velocity up to v_max ~ 4,000 km/s with respect to the center of mass of the initial binary.
Baker, Berti, Berti, Bogdanović, Brenneman, Campanelli, Chang, Emanuele Berti, Ferrarese, Herrmann, Kesden, Lousto, Magorrian, Merritt, Michael Kesden, Reynolds, Schnittman, Schnittman, Tremaine, Ulrich Sperhake, van Meter   +20 more
core   +2 more sources

Evolution of Supermassive Black Holes [PDF]

, 2007
Supermassive black holes (SMBHs) are nowadays believed to reside in most local galaxies, and the available data show an empirical correlation between bulge luminosity - or stellar velocity dispersion - and black hole mass, suggesting a single mechanism for assembling black holes and forming spheroids in galaxy halos. The evidence is therefore in favour
openaire   +2 more sources

Supermassive black holes in the early Universe [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015
The recent discovery of the ultraluminous quasar SDSS J010013.02+280225.8 at redshift 6.3 has exacerbated the time compression problem implied by the appearance of supermassive black holes only approximately 900 Myr after the big bang, and only approximately 500 Myr beyond the formation of Pop II and III stars.
F. Melia, T. M. McClintock
openaire   +2 more sources

Selection bias in dynamically measured supermassive black hole samples: its consequences and the quest for the most fundamental relation [PDF]

, 2016
We compare the set of local galaxies having dynamically measured black holes with a large, unbiased sample of galaxies extracted from the Sloan Digital Sky Survey.
F. Shankar, M. Bernardi, R. Sheth, L. Ferrarese, A. Graham, G. Savorgnan, V. Allevato, A. Marconi, R. Laesker, A. U. O. Southampton, U. Pennsylvania, H. I. O. Astrophysics, Victoria, Centre for Gravitational Astrophysics, Supercomputing, S. U. O. Technology, U. Helsinki, U. Firenze, M. F. Astronomy, Sissa, Trieste   +20 more
semanticscholar   +1 more source

Hierarchical build-up of galactic bulges and the merging rate of supermassive binary black holes

, 2003
The hierarchical build-up of galactic bulges should lead to the build-up of present-day supermassive black holes by a mixture of gas accretion and merging of supermassive black holes.
Begelman M, Begelman M, Bender P, Bernardi M, Gerssen J, Haehnelt M G, Haehnelt M G, Haehnelt M G, Martin G Haehnelt, Milosavljevic M, Soltan A, Yu Q   +11 more
core   +1 more source

Probing supermassive black hole binaries with pulsar timing [PDF]

Nature Astronomy, 2019
The detection of a gravitational-wave background at nanohertz frequencies can tell us if and how supermassive black holes merge, and inform our knowledge of galaxy merger rates and supermassive black hole masses. All we have to do is time pulsars.
C. Mingarelli
semanticscholar   +1 more source

Observational evidence for a connection between SMBHs and dark matter haloes [PDF]

, 2004
We investigate the relation between circular velocity vc and bulge velocity dispersion sigma in spiral galaxies, based on literature data and new spectroscopic observations. We find a strong, nearly linear vc-sigma correlation with a negligible intrinsic
Baes, Maarten, Buyle, Pieter, Dejonghe, Herwig, Ferrarese, Laura, Gentile, Gianfranco   +4 more
core   +2 more sources

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

On the orbital evolution of supermassive black hole binaries with circumbinary accretion discs [PDF]

, 2017
Gaseous circumbinary accretion discs provide a promising mechanism to facilitate the mergers of supermassive black holes (SMBHs) in galactic nuclei. We measure the torques exerted on accreting SMBH binaries, using 2D, isothermal, moving-mesh, viscous ...
Yi-Lei Tang, A. MacFadyen, Z. Haiman
semanticscholar   +1 more source