Results 31 to 40 of about 306,823 (323)

A New Parameter In Accretion Disk Model

, 2000
Taking optically thin accretion flows as an example, we investigate the dynamics and the emergent spectra of accretion flows with different outer boundary conditions (OBCs) and find that OBC plays an important role in accretion disk model.
AF Illarionov, E Quataert, F Yuan, F Yuan, IV Igumenshchev, JF Lu, LS Sparke, MA Abramowicz, MA Abramowicz, NI Shakura, R Coker, R Matsumoto, R Narayan, R Narayan, R Narayan, X Chen, X Chen   +16 more
core   +1 more source

Chemical Evolution in VeLLOs [PDF]

, 2007
A new type of object called "Very Low Luminosity Objects (VeLLOs)" has been discovered by the Spitzer Space Telescope. VeLLOs might be substellar objects forming by accretion.
Lee, Jeong-Eun
core   +2 more sources

Impact of wave energy and sediment transport on shoreline changes: A multi-temporal satellite image analysis in Galesong, Takalar Regency, Indonesia

Journal of Degraded and Mining Lands Management
Galesong Beach, located in Takalar Regency, South Sulawesi, is a coastal area that has experienced significant shoreline changes due to anthropogenic activities, such as coastal development and land use, and oceanographic factors, particularly wave ...
Sakka Sakka, Alimuddin Hamzah Assegaf, Amiruddin Amiruddin, Saaduddin Saaduddin, Siti Nur Azisah Aprianti Azis, Andi Muhammad Imran Ismail   +5 more
doaj   +1 more source

A Relativistic Entropic Hamiltonian–Lagrangian Approach to the Entropy Production of Spiral Galaxies in Hyperbolic Spacetime

Universe, 2021
Double-spiral galaxies are common in the Universe. It is known that the logarithmic double spiral is a Maximum Entropy geometry in hyperbolic (flat) spacetime that well represents an idealised spiral galaxy, with its central supermassive black hole (SMBH)
Michael C. Parker, Chris Jeynes
doaj   +1 more source

Phantom Accretion onto the Schwarzschild de-Sitter Black Hole

, 2011
We deal with phantom energy accretion onto the Schwarzschild de-Sitter black hole. The energy flux conservation, relativistic Bernoulli equation and mass flux conservation equation are formulated to discuss the phantom accretion.
Babichev E, Bennett C L, Bondi H, Caldwell R R, G Abbas, Hinshaw G, M Sharif, Nagai H, Padmanabhan T, Perlmutter S, Perlmutter S, Riess A G, Sahni V, Sen A J, Spergel D N, Sung-Won K   +15 more
core   +1 more source

Geospatial technology based shoreline change analysis (1992–2022) and predictive forecast modeling for 2032 and 2042, utilizing DSAS, along the eastern coast of India

Kuwait Journal of Science
This study presents a comprehensive analysis of shoreline dynamics in the Thanjavur district, focusing on erosion and accretion trends from 1992 to 2022. The coastal region was partitioned based on Taluk boundaries to discern distinct patterns in erosion
Harikrishna S., Gurugnanam B., Bairavi S.   +2 more
doaj   +1 more source

Mass Transfer in Mira-Type Binaries

Open Astronomy, 2012
Detached, symbiotic binaries are generally assumed to interact via Bondi-Hoyle-Littleton (BHL) wind accretion. However, the accretion rates and outflow geometries that result from this mass-transfer mechanism cannot adequately explain the observations of
Mohamed S., Podsiadlowski Ph.
doaj   +1 more source

Accretion onto a Kiselev black hole

, 2017
We consider accretion onto a Kiselev black hole. We obtain the fundamental equations for accretion without the back-reaction. We determine the general analytic expressions for the critical points and the mass accretion rate and find the physical ...
Jiao, Lei, Yang, Rong-Jia
core   +1 more source

A Long-Term Study of Ultraluminous X-ray Sources in NGC 891

Universe, 2021
We perform empirical fits to the Chandra and XMM-Newton spectra of three ultraluminous X-ray sources (ULXs) in the edge-on spiral galaxy NGC 891, monitoring the region over a 17-year time window.
Nicholas M. Earley , Vikram V. Dwarkadas , Victoria Cirillo    +2 more
doaj   +1 more source

On the accretion flow geometry in A0535+26 [PDF]

, 2001
The geometry of accretion flow in the Be/X-ray transient A0535+26 is explored. It is shown that neither moderate nor giant X-ray flaring events observed in the system can be interpreted within the spherically symmetrical accretion model and hence the ...
Alpar, Anzer, Arons, Clark, Clark, Clark, Coe, Dal Fiume, de Loore, Eggleton, Elsner, Finger, Ghosh, Giovannelli, Haigh, Hanuschik, Ikhsanov, Kanno, Lamb, Lamers, Lee, Matsuda, Motch, N. G. Beskrovnaya, N. R. Ikhsanov, Negueruela, Okazaki, Porter, Rosenberg, Shakura, Taam, V. M. Larionov, van der Klis   +32 more
core   +2 more sources