Results 41 to 50 of about 248,477 (327)

Pure Gauss–Bonnet NUT black hole solution: I

European Physical Journal C: Particles and Fields, 2022
We obtain an exact $$\Lambda $$ Λ -vacuum solution in the pure Gauss–Bonnet gravity with NUT charge in six dimension, with horizon having the product topology of $$S^{(2)} \times S^{(2)}$$ S ( 2 ) × S ( 2 ) .
Sajal Mukherjee, Naresh Dadhich
doaj   +1 more source

First Fruits of the Spitzer Space Telescope: Galactic and Solar System Studies [PDF]

, 2006
This article provides a brief overview of the Spitzer Space Telescope and discusses its initial scientific results on galactic and solar system science.Comment: Review article to appear in slightly different format in Vol.44 of Annual Reviews of ...
Crovisier J, Cushing MC, D'Alessio P, Dan M. Watson, Douvion T, George Rieke, Giovanni Fazio, Gutermuth RA, Hartmann L, Harvey PM, Kenyon SJ, Lanz T, Luhman KL, Marley MS, Michael Werner, Reipurth B, Rosenthal D, Saumon D, Thomas L. Roellig, van Marle AJ, Wooden DH   +20 more
core   +2 more sources

The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)

Astronomische Nachrichten, EarlyView.
ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini, Virginio Oldani, Andrea Farina, Paolo Ochner, Andrea Reguitti, Luigi R. Bedin, Jean Gabriel Bosch, Erik Bryssinck, Roberto Crippa, Stéphan Gaumont‐Guay, Carl W. Hergenrother, Joel Nicolas, Ivo Scheggia   +12 more
wiley   +1 more source

Measuring Research Impact of Astronomers/Astrophysicists by using Astrophysics Data System Beta: A Powerful New Interface: A case study with Special Reference to Prof. Jayant V. Narlikar

EPJ Web of Conferences, 2018
This paper highlights qualitatively and quantitatively research and presents a valuable overview of new citation enhanced databases in the context of research evaluation for the productivity of Prof. Jayant V. Narlikar.
Kumar Sahu Hemant, Nath Singh Surya
doaj   +1 more source

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

Astronomische Nachrichten, EarlyView.
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

Nucleosynthesis in Type Ia Supernovae, Classical Novae, and Type I X-Ray Bursts. A Primer on Stellar Explosions [PDF]

EPJ Web of Conferences
Nuclear astrophysics aims at unraveling the cosmic origins of chemical elements and the physical processes powering stars. It constitutes a truly multidisciplinary field, that integrates tools, advancements, and accomplishments from theoretical ...
José Jordi
doaj   +1 more source

Supermassive Black Holes in Active Galactic Nuclei [PDF]

, 2000
This article gives a brief overview of the direct and indirect evidence in support of the standard paradigm that active galactic nuclei are powered by supermassive black holes.Comment: A review to appear in The Encyclopedia of Astronomy and Astrophysics
Ho, Luis C., Kormendy, John
core   +3 more sources

A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm

Astronomische Nachrichten, EarlyView.
ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber, Maximilian Halenke, Aakash Bhat, Veronika Schaffenroth   +3 more
wiley   +1 more source

A Unified Model for Bipolar Outflows from Young Stars: Kinematic Signatures of Jets, Winds, and Their Magnetic Interplay with the Ambient Toroids

The Astrophysical Journal, 2023
Kinematic signatures of the jet, winds, multicavities, and episodic shells arising in the unified model of bipolar outflows developed in Shang et al.
Hsien Shang, Chun-Fan Liu, Ruben Krasnopolsky, Liang-Yao Wang   +3 more
doaj   +1 more source

Effective geometry in Astrophysics

, 2004
The effective metric is introduced by means of two examples (non-linear electromagnetism and hydrodynamics),along with applications in Astrophysics.
Barcelo C., Gordon W., Leonhardt U., Matarresse S., Moncrief V., Novello M., Novello M., Santiago E. Perez Bergliaffa, Visser M.   +8 more
core   +1 more source