5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aryabhatta Research Institute of Observational SciencesIN239 papers
- Tata Institute of Fundamental ResearchIN175 papers
- Centre National de la Recherche ScientifiqueFR133 papers
- Pondicherry UniversityIN120 papers
- Indian Institute of Science BangaloreIN119 papers
- Inter-University Centre for Astronomy and AstrophysicsIN114 papers
- Christ UniversityIN108 papers
- National Centre for Radio AstrophysicsIN98 papers
- Physical Research LaboratoryIN92 papers
- Chinese Academy of SciencesCN77 papers
- Instituto de Astrofísica de CanariasES77 papers
- National Astronomical Observatory of JapanJP77 papers
70 papers · 1 filter
Photometric and spectroscopic studies of star-forming regions within Wolf-Rayet galaxies
Chrisphin Karthick. M, Angel R. Lopez-Sanchez, D. K. Sahu +2
We present a study of the properties of star-forming regions within a sample of 7 Wolf-Rayet (WR) galaxies. We analyze their morphologies, colours, star-formation rate (SFR), metal…
Chemical Compositions of RV Tauri Stars and Related Objects
S. Sumangala Rao, Sunetra Giridhar
We have undertaken a comprehensive abundance analysis for a sample of relatively unexplored RV Tauri and RV Tauri like stars to further our understanding of post-Asymptotic Giant B…
Electron Cooling in a Young Radio Supernova: SN 2012aw
Naveen Yadav, Alak Ray, Sayan Chakraborti +8
We present the radio observations and modeling of an optically bright Type II-P supernova (SN), SN 2012aw which exploded in the nearby galaxy Messier 95 (M95) at a distance of $10\…
Characteristics of polar coronal hole jets
K. Chandrashekhar, A. Bemporad, D. Banerjee +2
High spatial- and temporal-resolution images of coronal hole regions show a dynamical environment where mass flows and jets are frequently observed. These jets are believed to be i…
The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO
K. Chandrashekhar, R. J. Morton, D. Banerjee +1
EUV jets situated in coronal holes are thought to play an important role in supplying heated material to the corona and solar wind. The multi-wavelength capabilities and high signa…
Giant Low Surface Brightness Galaxies : Evolution in Isolation
Mousumi Das
Giant Low Surface Brightness (GLSB) galaxies are amongst the most massive spiral galaxies that we know of in our Universe. Although they fall in the class of late type spiral galax…
On the line profile changes observed during the X2.2 class flare in the active region NOAA 11158
A. Raja Bayanna, Brajesh Kumar, P. Venkatakrishnan +4
The solar active region NOAA 11158 produced a series of flares during its passage through the solar disk. The first major flare (of class X2.2) of the current solar cycle occurred…
Carbon-enhanced Metal-poor Stars in SDSS/SEGUE. I. Carbon Abundance Estimation and Frequency of CEMP Stars
Young Sun Lee, Timothy C. Beers, Thomas Masseron +8
We describe a method for the determination of stellar [C/Fe] abundance ratios using low-resolution (R = 2000) stellar spectra from the SDSS and SEGUE. By means of a star-by-star co…
Experimental validation of XRF inversion code for Chandrayaan-1
P. S. Athiray, M. Sudhakar, M. K. Tiwari +5
We have developed an algorithm (x2abundance) to derive the lunar surface chemistry from X-ray fluorescence (XRF) data for the Chandrayaan-1 X-ray Spectrometer (C1XS) experiment. Th…
Some consequences of a Universal Tension arising from Dark Energy for structures from Atomic Nuclei to Galaxy Clusters
C. Sivaram, Kenath Arun, Kiren O. V.
In recent work, a new cosmological paradigm implied a mass-radius relation, suggesting a universal tension related to the background dark energy (cosmological constant), leading to…
Outgassing Behavior of C/2012 S1 (ISON) From September 2011 to June 2013
Karen J. Meech, Bin Yang, Jan Kleyna +26
We report photometric observations for comet C/2012 S1 (ISON) obtained during the time period immediately after discovery (r=6.28 AU) until it moved into solar conjunction in mid-2…
Re-appearance of McNeil's nebula (V1647 Orionis) and its outburst environment
J. P. Ninan, D. K. Ojha, B. C. Bhatt +5
We present a detailed study of McNeil's nebula (V1647 Ori) in its ongoing outburst phase starting from September 2008 to March 2013. Our 124 nights of photometric observations were…
Is a deep one-cell meridional circulation essential for the flux transport Solar Dynamo?
Gopal Hazra, Bidya Binay Karak, Arnab Rai Choudhuri
The solar activity cycle is successfully modeled by the flux transport dynamo, in which the meridional circulation of the Sun plays an important role. Most of the kinematic dynamo…
Correlation trends in the ground state static electric dipole polarizabilities of closed-shell atoms and ions
Yashpal Singh, B. K. Sahoo, B. P. Das
We employ the closed-shell perturbed relativistic coupled-cluster (RCC) theory developed by us earlier [Phys. Rev. A {\bf 77}, 062516 (2008)] to evaluate the ground state static el…
Reflection and refraction of (magneto-)acoustic waves at the magnetic canopy: further evidences from multi-height seismic data
S. P. Rajaguru, Xudong Sun, K. Hayashi +1
We recently presented evidences (Rajaguru et al. 2012) that seismic halos around expanding magnetic structures in the lower solar atmosphere are related to the acoustic to magnetoa…
Network and Plage Indices from Kodaikanal Ca-K Data
K. P. Raju, Jagdev Singh
The Ca II K filtergrams from Kodaikanal Solar Observatory have been used to study the solar activity. The images are dominated by the chromospheric network and plages. Programs hav…
The Hamburg/ESO R-process Enhanced Star survey (HERES) VIII. The r+s star HE 1405 0822
W. Y. Cui, T. Sivarani, N. Christlieb
Aims.The aim of this study is a detailed abundance analysis of the newly discovered r-rich star HE 1405 0822, which has [Fe=H]=-2.40. This star shows enhancements of both r- and s-…
Polarized Line Formation in Multi-dimensional Media. IV. A Fourier Decomposition Technique To Formulate The Transfer Equation With Angle-Dependent Partial Frequency Redistribution
L. S. Anusha, K. N. Nagendra
To explain the linear polarization observed in spatially resolved structures in the solar atmosphere, the solution of polarized radiative transfer (RT) equation in multi-dimensiona…
Polarized Line Formation in Multi-dimensional Media. V. Effects of Angle-Dependent Partial Frequency Redistribution
L. S. Anusha, K. N. Nagendra
The solution of polarized radiative transfer equation with angle-dependent (AD) partial frequency redistribution (PRD) is a challenging problem. Modeling the observed, linearly pol…
Multi-dimensional radiative transfer to analyze Hanle effect in Ca {\sc ii} K line at 3933 Å\,
L. S. Anusha, K. N. Nagendra
Radiative transfer (RT) studies of the linearly polarized spectrum of the Sun (the second solar spectrum) have generally focused on the line formation, with an aim to understand th…
Photometric Identification of Objects from Galaxy Evolution Explorer Survey and Sloan Digital Sky Survey
K. Preethi, S. B. Gudennavar, S. G. Bubbly +2
We have used GALEX and SDSS observations to extract 7 band photometric magnitudes for over 80,000 objects in the vicinity of the North Galactic Pole. Although these had been identi…
Kinematics and excitation of the nuclear spiral in the active galaxy Arp 102B
Guilherme S. Couto, Thaisa Storchi-Bergmann, David J. Axon +3
We present a two-dimensional analysis of the gaseous excitation and kinematics of the inner 2.5 x 1.7 kpc^2 of the LINER/Seyfert 1 galaxy Arp 102B, from optical spectra obtained wi…
Properties of Newly Formed Dust Grains in The Luminous Type IIn Supernova 2010jl
K. Maeda, T. Nozawa, D. K. Sahu +15
Supernovae (SNe) have been proposed to be the main production sites of dust grains in the Universe. Our knowledge on their importance to dust production is, however, limited by obs…
Filament eruption in association with rotational motion near the filament footpoints
Sajal Kumar Dhara, B. Ravindra, Ravinder Kumar Banyal
The active region magnetic field surrounding the filament plays an important role in filament formation, their evolution and disruption. We investigated a filament eruption that oc…