40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.3k papers
- Panjab UniversityIN2.1k papers
- Korea UniversityKR1.9k papers
- Sungkyunkwan UniversityKR1.9k papers
- Charles UniversityCZ1.9k papers
- Princeton UniversityUS1.9k papers
- Institute of High Energy PhysicsCN1.8k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.8k papers
- National Central UniversityTW1.8k papers
- Kyungpook National UniversityKR1.8k papers
- University of Maryland, College ParkUS1.8k papers
- University of California, RiversideUS1.8k papers
30 papers · 2 filters
Pulsar Scintillation in the Local ISM: Loop I and Beyond
N. D. Ramesh Bhat, Yashwant Gupta
Recent pulsar scintillation measurements from Ooty, in conjunction with those from Parkes and other large radio telescopes, are used for a systematic investigation of the Local Int…
Disk-Jet Connection in Cygnus X-3
M. Choudhury, A. R. Rao, S. V. Vadawale +2
We present the results of a detailed correlation study between the soft X-ray, hard X-ray, and radio emission (obtained from RXTE ASM, BATSE, and GBI observations, respectively) of…
X-ray properties of the microquasar GRS 1915+105 during a variability class transition
S. Naik, P. C. Agrawal, A. R. Rao +1
We present a detailed X-ray study of the microquasar GRS 1915+105 during a variability class transition observed in 2000 June with the PPCs of the Indian X-ray Astronomy Experiment…
Solar-cycle variation of the sound-speed asphericity from GONG and MDI data 1995-2000
H. M. Antia, S. Basu, F. Hill +3
We study the variation of the frequency splitting coefficients describing the solar asphericity in both GONG and MDI data, and use these data to investigate temporal sound-speed va…
Gamma-Hadron Separation using Čerenkov Photon Density Fluctuations
P. N. Bhat, V. R. Chitnis
In atmospheric Čerenkov technique rays are detected against abundant background produced by hadronic showers. In order to improve signal to noise ratio of the experiment, it is…
The Consequences of the Cosmic Star-Formation Rate: X-ray Number Counts
A. Ptak, R. Griffiths, N. White +1
We discuss the observable consequences for the detection of galaxies in the X-ray bandpass resulting from a peak in the cosmic star-formation rate at a redshift > 1. Following Whit…
X-Ray Probes of Cosmic Star-Formation History
Pranab Ghosh, Nicholas E. White
We discuss the imprints left by a cosmological evolution of the star formation rate (SFR) on the evolution of X-ray luminosities Lx of normal galaxies, using the scheme proposed by…
Ring diagram analysis of the characteristics of solar oscillation modes in active regions
S. P. Rajaguru, Sarbani Basu, H. M. Antia
The presence of intense magnetic fields in and around sunspots is expected to modify the solar structure and oscillation frequencies. Applying the ring diagram technique to data fr…
Temporal variations of solar rotation rate at high latitudes
H. M. Antia, Sarbani Basu
Frequency splitting coefficients from Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) observations covering the period 1995--2001 are used to study tempo…
Was the Cosmic Web of Protogalactic Material Permeated by Lobes of Radio Galaxies During the Quasar Era?
Gopal-Krishna, Paul J. Wiita
Evidence for extended active lifetimes (> 10^8 yr) for radio galaxies implies that many large radio lobes were produced during the `quasar era', 1.5 < z < 3, when the comoving dens…
Far infrared mapping of three Galactic star forming regions : W3(OH), S 209 & S 187
S. K. Ghosh, B. Mookerjea, T. N. Rengarajan +2
Three Galactic star forming regions associated with W3(OH), S209 and S187 have been simultaneously mapped in two trans-IRAS far infrared (FIR) bands centered at ~ 140 and 200 micro…
Seismic study of stellar convective cores
Anwesh Mazumdar, H. M. Antia
It has been shown that a discontinuity in the derivatives of the sound speed at the edge of the convective regions inside a star gives rise to a characteristic oscillatory signal i…
Determination of time delay from the gravitational lens B1422+231
A. R. Patnaik, D. Narasimha
We present the radio light curves of lensed images of the gravitational lens B1422+231. The observations have been carried out using the VLA at 8.4 and 15 GHz over a period of 197…
X-ray flares/bursts from GRS 1915+105 and the two component accretion flow
J. S. Yadav, A. R. Rao
We present results of our analysis of a set of RXTE/PCA observations of X-ray flares/bursts with burst cycle ranging from 30 to 1300 s from the Galactic X-ray transient source GRS…
X-Ray Bursts from the Galactic X-Ray Transient Source GRS 1915+105
J. S. Yadav, A. R. Rao
We have analyzed publicly available RXTE/PCAs archival data of GRS 1915+105 during its burst/flaring state. The burst cycle ranges from 30 to 1300 s. These bursts are different fro…
The T Tauri star RXJ1608.6-3922 - not an eclipsing binary but a spotted single star
V. Joergens, E. Guenther, R. Neuhäuser +2
High-resolution spectroscopy and photometric monitoring of the pre-main sequence star RXJ1608.6-3922 shows that it is not an eclipsing binary, as previously claimed. Radial velocit…
OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization
Andrzej A. Zdziarski, J. Eric Grove, Juri Poutanen +2
GRS 1915+105 was observed by the CGRO/OSSE 9 times in 1995-2000, and 8 of those observations were simultaneous with those by RXTE. We present an analysis of all of the OSSE data an…
Different Types of X-ray Variability Observed in Micro-Quasar GRS 1915+105 with the IXAE
S. Naik, P. C. Agrawal, B. Paul +3
The galactic micro-quasar source GRS 1915+105 has been observed with the Indian X-ray Astronomy Experiment (IXAE) several times over a period extending from 1996 to 2000. The sourc…
Spectral differences between the radio-loud and radio-quiet low-hard states of GRS 1915+105: possible detection of synchrotron radiation in X-rays
S. V. Vadawale, A. R. Rao, S. K. Chakrabarti
The Galactic microquasar GRS 1915+105 exhibits several episodes of steady X-ray emission characterized by a hard power-law spectrum and intense Quasi Periodic Oscillations. It is k…
Observational evidence for mass ejection during soft X-ray dips in GRS1915+105
S. V. Vadawale, A. R. Rao, A. Nandi +1
We investigate the connection between the X-ray and radio properties of the Galactic microquasar GRS1915+105, by analyzing the X-ray data observed with RXTE, during the presence of…
Study of star formation in RCW 106 using far infrared observations
A. D. Karnik, S. K. Ghosh, T. N. Rengarajan +1
High resolution far-infrared observations of a large area of the star forming complex RCW 106 obtained using the TIFR 1-metre balloon-borne telescope are presented. Intensity maps…
Optical and X-ray characteristics of a newly discovered narrow-line QSO : RX J1334.2+3759
G. C. Dewangan, K. P. Singh, L. R. Jones +3
We report the discovery of a narrow-line QSO (NLQSO) RX J1334.2+3759 with a steep soft X-ray spectrum. Soft X-ray emission from the NLQSO is highly variable. Changes in the intensi…
Gamma Ray and Hadron generated Čerenkov Photon Spectra at Various Observation Altitudes
M. A. Rahman, P. N. Bhat, B. S. Acharya +3
We study the propagation of Cerenkov photons generated by Very High Energy gamma-rays and hadrons in the atmosphere. The photon production height distributions are estimated from s…
The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy
Gopal-Krishna, Paul J. Wiita
We show that a model for radio source dynamics we had earlier proposed can readily reproduce the relationship between the radio power division separating the two Fanaroff-Riley cla…