Journal of Astrophysics and Astronomy
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Position Measurements of the Core in 3C 66B
Journal of Astrophysics and Astronomy - Tập 32 - Trang 61-63 - 2011
It was argued that 3C 66B, a nearby radio galaxy, harbors a supermassive black hole binary (SMBHB). To investigate this, a 4-epoch VLBA phase referencing imaging observation was performed in 2004–2005. Here we present some preliminary results of this project. We found a large position difference compared to previous results.
Suzaku observation of the eclipsing high mass X-ray binary pulsar XTE J1855-026
Journal of Astrophysics and Astronomy - Tập 39 - Trang 1-7 - 2018
We report results from analysis performed on an eclipsing supergiant high mass X-ray binary pulsar XTE J1855-026 observed with the X-ray Imaging Spectrometer (XIS) on-board Suzaku Observatory in April 2015. Suzaku observed this source for a total effective exposure of
$$\sim $$
...... hiện toàn bộ
Transition between general relativity and quantum gravity using quark and strange quark matter with some kinematical test
Journal of Astrophysics and Astronomy - Tập 39 - Trang 1-8 - 2018
Contemporary piece of writing devotes to the investigation of plane symmetric cosmological model with quark and strange quark matter in the deformations of the Einstein’s theory of General Relativity (GR). At small or large scales (ultraviolet or infrared gravity), deformations of the Einstein’s theory could provide a better handling of cosmic acceleration without magnetism (along with singulariti...... hiện toàn bộ
Special calibrations during AstroSat mission operations towards meeting observation and pointing requirements
Journal of Astrophysics and Astronomy - Tập 42 Số 2 - 2021
Possibilities of identifying members from Milky Way satellite galaxies using unsupervised machine learning algorithms
Journal of Astrophysics and Astronomy - Tập 45 - Trang 1-20 - 2024
A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning methods to identify new members for nine nearby MW satellite galaxies using Gaia data release-3 (Gaia DR3) astrometry, the Dark Energy Survey (DES) and the DECam Local Volume E...... hiện toàn bộ
The Nainital-Cape Survey: A search for variability in Ap and Am stars
Journal of Astrophysics and Astronomy - Tập 26 Số 2-3 - Trang 193-201 - 2005
HI fluctuations at large redshifts: II — the signal expected for the GMRT
Journal of Astrophysics and Astronomy - Tập 24 - Trang 23-35 - 2003
For the GMRT, we calculate the expected signal from red-shifted HI emission at two frequency bands centered at 610 and 325 MHz. The study focuses on the visibility-visibility cross-correlations, proposed earlier as the optimal statistical estimator for detecting and analyzing this signal. These correlations directly probe the power spectrum of density fluctuations at the redshift where the radiati...... hiện toàn bộ
Stark Broadening Parameters for Neutral Oxygen Spectral Lines
Journal of Astrophysics and Astronomy - Tập 36 - Trang 661-669 - 2015
Stark broadening parameters for nine neutral oxygen (O I) lines have been determined within the impact approximation and the semiclassical perturbation method. The atomic data have been taken from the TOPbase and NIST atomic databases. The electron and proton Stark widths and shifts and ion broadening parameter values for these O I lines have been calculated for electron density of 10 16 cm −3 and...... hiện toàn bộ
Distribution of latitudes and speeds of Coronal Mass Ejections in the northern and southern hemispheres in cycle 23
Journal of Astrophysics and Astronomy - Tập 28 - Trang 207-215 - 2008
Distribution of latitudes and speeds of Coronal Mass Ejections (CMEs) in the northern and southern hemispheres in cycle 23, from September 1996 to December 2006, have been analyzed. By calculating the actual probability of the hemispheric distribution of the activity of the CME, we find that a southern dominance of the activity of the CME is shown to occur in cycle 23 from September 1996 to Decemb...... hiện toàn bộ
Yields of Nucleosynthesis from massive and intermediate mass stars and constraints on their final evolution
Journal of Astrophysics and Astronomy - - 1985
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