Results 31 to 40 of about 63,717 (334)

Kretschmann Scalar for a Kerr-Newman Black Hole [PDF]

, 1999
I have derived the Kretschmann scalar for a general black hole of mass m, angular momentum per unit mass a, and electric charge Q. The Kretschmann scalar gives the amount of curvature of spacetime, as a function of position near (and within) a black hole.
Henry, Richard C.
core   +3 more sources

An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing* [PDF]

The Astrophysical Journal, 2022
Abstract We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). We used the Hubble Space Telescope (HST) to carry out precise astrometry of the source star of the long-duration (t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462
Sahu, KC, Anderson, J, Casertano, S, Bond, HE, Udalski, A, Dominik, M, Calamida, A, Bellini, A, Brown, TM, Rejkuba, M, Bajaj, V, Kains, N, Ferguson, HC, Fryer, CL, Yock, P, Mroz, P, Kozlowski, S, Pietrukowicz, P, Poleski, R, Skowron, J, Soszynski, I, Szymanski, MK, Ulaczyk, K, Wyrzykowski, L, Barry, R, Bennett, DP, Bond, IA, Hirao, Y, Silva, SI, Kondo, I, Koshimoto, N, Ranc, C, Rattenbury, NJ, Sumi, T, Suzuki, D, Tristram, PJ, Vandorou, A, Beaulieu, J-P, Marquette, J-B, Cole, A, Fouque, P, Hill, K, Dieters, S, Coutures, C, Dominis-Prester, D, Bennett, C, Bachelet, E, Menzies, J, Albrow, M, Pollard, K, Gould, A, Yee, J, Allen, W, Almeida, LA de, Christie, G, Drummond, J, Gal-Yam, A, Gorbikov, E, Jablonski, F, Lee, C-U, Maoz, D, Manulis, I, McCormick, J, Natusch, T, Pogge, RW, Shvartzvald, Y, Jorgensen, UG, Alsubai, KA, Andersen, MI, Bozza, V, Novati, SC, Hinse, TC, Hundertmark, M, Husser, T-O, Kerins, E, Longa-Pena, P, Mancini, L, Penny, M, Rahvar, S, Ricci, D, Sajadian, S, Skottfelt, J, Snodgrass, C, Southworth, J, Tregloan-Reed, J, Wambsganss, J, Wertz, O, Tsapras, Y, Street, RA, Bramich, DM, Horne, K, Steele, IA, STScI, , PSU, , Warsaw, Univ, Andrews, Univ St, ESO, , Columbia, Univ, Lab, Los Alamos Nat, Auckland, Univ, Warwick, Univ, Centre, NASA Goddard Space Flight, Maryland, Univ, Univ, Massey, Univ, Osaka, America, Catholic Univ of, Heidelberg, Univ, Auckland, Univ, Obs, Mt John, Zealand, New, Tasmania, Univ, Paris, IAP, Bordeaux, Univ, Toulouse, Univ, Japan, Nat Astron Obs, MIT, , Obs, Las Cumbres, SAAO, , Africa, South, Canterbury, Univ, Zealand, New, Astronomy, Max-Planck-Inst for, Heidelberg, , Univ, Ohio State, CfA, , Cambridge, , MA, , Obs, Vintage Lane, Zealand, New, Norte, Univ Federal do Rio Grande do, Natal, , Brazil, , Norte, Univ Federal do Rio Grande do, Mossoró, , Brazil, , Obs, Auckland, Obs, Possum, Zealand, New, Queensland, Univ Southern, Australia, , Sci, Weizmann Inst of, Univ, Tel-Aviv, Israel, , Espacias, Inst Nacional de Pesquisas, Brazil, , Astron, Korea, Inst, Space Sci, Univ, Tel-Aviv, Sci, Weizmann Inst, Obs, Farm Cove, Zealand, New, IRASR, , Zealand, New, Sci, Weizmann Inst, Copenhagen, Univ, QEERI, , Doha, , Qatar, , Copenhagen, Univ, Denmark, , Salerno, Univ, Italy, , Napoli, INFN, IPAC, , Pasadena, , Toruń, Nicolaus Copernicus Univ, Univ, Chungnam Nat, Korea, South, Göttingen, Univ, Germany, , Astroph, Jodrell Bank Centre, Manchester, , Antofagasta, Univ, Rome, Univ, Turin, INAF, Univ, Louisiana State, Tech, Sharif Univ of, Tehran, , Padova, INAF, Tech, Isfahan Univ, Univ, Open, Keynes, Milton, Edinburgh, Univ, Univ, Keele, Atacama, Univ, Chile, , Liège, Univ, Dhabi, NY Univ Abu, Univ, Liverpool John Moores, Collaboration, OGLE, Collaboration, MOA, Collaboration, PLANET, Collaboration, microFUN, Consortium, MiNDSTEp, Collaboration, RoboNet   +194 more
openaire   +13 more sources

The effect of stellar-mass black holes on the central kinematics of omega Cen: a cautionary tale for IMBH interpretations [PDF]

, 2018
The search for intermediate-mass black holes (IMBHs) in the centre of globular clusters is often based on the observation of a central cusp in the surface brightness profile and a rise towards the centre in the velocity dispersion profiles.
Gieles, Mark, Hénault-Brunet, Vincent, Zocchi, Alice   +2 more
core   +4 more sources

Gravitational Microlensing Events Due to Stellar‐Mass Black Holes [PDF]

The Astrophysical Journal, 2002
We present an analysis of the longest timescale microlensing events discovered by the MACHO Collaboration during a 7 year survey of the Galactic bulge. We find 6 events that exhibit very strong microlensing parallax signals due, in part, to accurate photometric data from the GMAN and MPS collaborations. The microlensing parallax fit parameters are used
Bennett, D P, Becker, Andrew C, Quinn, J M W, Tomaney, A B, Alcock, Charles, Allsman, Robyn, Alves, David R, Axelrod, Tim, Calitz, J., Cook, Kem H, Drake, Andrew J, Fragile, P C, Freeman, Kenneth, Geha, M, Griest, K, Johnson, B Ronald, Keller, S C, Laws, C, Lehner, M J, Marshall, S L, Minniti, Dante, Nelson, C A, Peterson, Bruce, Popowski, P, Pratt, M, Quinn, Peter J, Rhie, S., Stubbs, Christopher W, Sutherland, William J, Vandehei, T, Welch, D L   +30 more
openaire   +4 more sources

Observational Evidence for Cosmological Coupling of Black Holes and its Implications for an Astrophysical Source of Dark Energy

The Astrophysical Journal Letters, 2023
Observations have found black holes spanning 10 orders of magnitude in mass across most of cosmic history. The Kerr black hole solution is, however, provisional as its behavior at infinity is incompatible with an expanding universe.
Duncan Farrah, Kevin S. Croker, Michael Zevin, Gregory Tarlé, Valerio Faraoni, Sara Petty, Jose Afonso, Nicolas Fernandez, Kurtis A. Nishimura, Chris Pearson, Lingyu Wang, David L Clements, Andreas Efstathiou, Evanthia Hatziminaoglou, Mark Lacy, Conor McPartland, Lura K Pitchford, Nobuyuki Sakai, Joel Weiner   +18 more
doaj   +1 more source

Estimating the spins of stellar-mass black holes [PDF]

, 2011
We describe a program that we have embarked on to estimate the spins of stellar-mass black holes in X-ray binaries. We fit the continuum X-ray spectrum of the radiation from the accretion disk using the standard thin disk model, and extract the dimensionless spin parameter a* = a/M of the black hole as a parameter of the fit.
McClintock, Jeffrey E., Narayan, Ramesh, Shafee, Rebecca   +2 more
openaire   +2 more sources

Black holes in stellar-mass binary systems: expiating original spin? [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
Accepted for publication in MNRAS in original form.
King, A., Nixon, C.
openaire   +3 more sources

Tracing the Evolution of SMBHs and Stellar Objects in Galaxy Mergers: A Multi-mass Direct N-body Model

The Astrophysical Journal, 2023
By using direct N -body numerical simulations, we model the dynamical coevolution of two supermassive black holes (SMBHs) and the surrounding stars in merging galaxies. In order to investigate how different stellar components evolve during the merger, we
Shuo Li, Shiyan Zhong, Peter Berczik, Rainer Spurzem, Xian Chen, F. K. Liu   +5 more
doaj   +1 more source

Intermediate-Mass Black Holes: The Essential Population to Explore the Unified Model for Accretion and Ejection Processes

Galaxies, 2023
We study radio and X-ray emissions from intermediate-mass black holes (IMBHs) and explore the unified model for accretion and ejection processes. The radio band survey of IMBH (candidate) hosted galaxies indicates that only a small fraction (∼0.6%) of ...
Xiaolong Yang, Jun Yang
doaj   +1 more source

The Dynamical Evolution of Stellar Black Holes in Globular Clusters

, 2014
Our current understanding of the stellar initial mass function and massive star evolution suggests that young globular clusters may have formed hundreds to thousands of stellar-mass black holes, the remnants of stars with initial masses from $\sim 20 ...
Morscher, Meagan, Pattabiraman, Bharath, Rasio, Frederic A., Rodriguez, Carl, Umbreit, Stefan   +4 more
core   +1 more source