Paul, B., Jaaffery, S. N. A., Naik, S., Agrawal, P. C.
We report timing and spectral properties of the transient Be X-ray pulsar EXO 053109--6609.2 studied using observations made with the ASCA and BeppoSAX observatories. Though there must have been at...
New Measurements of Orbital Period Change in Cygnus X-3 (2002)
Singh, N. S., Naik, S., Paul, B., Agrawal, P. C., Rao, A. R., Singh, K. Y.
A nonlinear nature of the binary ephemeris of Cygnus X-3 indicates either a change in the orbital period or an apsidal motion of the orbit. We have made extended observations of Cygnus X-3 with the...
X-ray properties of the microquasar GRS 1915+105 during a variability class transition (2001)
Naik, S., Agrawal, P. C., Rao, A. R., Paul, B.
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. We supplement...
Different Types of X-ray Variability Observed in Micro-Quasar GRS 1915+105 with the IXAE (2001)
Naik, S., Agrawal, P. C., Paul, B., Rao, A. R., Yadav, J. S., Seetha, S.
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 source has been observed...
Observation of X-ray binary Cygnus X-3 by Indian X-ray Astronomy Experiment (2001)
Singh, N. S, Singh, K. Y, Naik, S, Paul, B, Agrawal, P. C
The X-ray binary Cygnus X-3 was observed with the Indian X-ray Astronomy Experiment (IXAE) on Board the Indian Remote Sensing Satellite IRS-P3 during July 3-13, 1999 and October 11-24, 1999 with...
Production of Two Photons and a Jet Through Gluon Fusion (2000)
We have computed the cross-section and distributions for the production of two photons and a jet via the process $g g \to \gamma\gamma g$. In the Standard Model, this process occurs at the one-loop...
Detection of a Series of X-ray Dips Associated with a Radio Flare in GRS 1915+105 (2000)
Naik, S., Agrawal, P. C., Rao, A. R., Paul, B., Seetha, S., Kasturirangan, K.
We report the detection of a series of X-ray dips in the Galactic black hole candidate GRS 1915+105 during 1999 June 6-17 from observations carried out with the Pointed Proportional Counters of the...
Naik, S, Agrawal, P. C, Paul, B, Rao, A. R, Seetha, S, Kasturirangan, K
The observations of X-ray transient XTE J1748-288 were made in the energy band 2 - 18 keV with the Indian X-ray astronomy experiment (IXAE) during 1998, June 14-25 with total useful exposure of...
Study of two pulsars with the Indian X-ray Astronomy Experiment (2000)
Mukerjee, K, Agrawal, P. C, Paul, B, Rao, A. R, Yadav, J. S, Seetha, S, ...
The X-ray pulsars Cep X-4 and 4U 1907+09 were observed with the Indian X-ray Astronomy Experiment (IXAE). Observations of Cep-X4 were made during the declining phase of its latest 30 days outburst in...
Leptoquark Contribution to the Higgs Boson Production at the LHC Collider (1999)
In this report we study how a light-scalar leptoquark could affect the Higgs boson production cross-section at the LHC collider. We construct the most general renormalizable and gauge invariant...
A Study of the X-Ray Emission of Magnetic Cataclysmic Variable Ae Aquarii (1999)
Choi, Chul-Sung, Dotani, Tadayasu, Agrawal, P. C.
We report results from analysis of the X-ray observations of AE Aqr, made with Ginga in June 1988 and with ASCA in October 1995. Pulsations are detected clearly with a sinusoidal pulse profile with...
Different types of X-ray bursts from GRS 1915+105 and their origin (1999)
Yadav, J. S., Rao, A. R., Agrawal, P. C., Paul, B., Seetha, S., Kasturirangan, K.
We report the X-ray observations of the Galactic X-ray transient source GRS 1915+105 with the PPCs of the Indian X-ray Astronomy Experiment(IXAE) onboard the Indian satellite IRS-P3 during 1997 June...
X-ray bursts from GRS 1915+105 observed with IXAE (1999)
Yadav, J. S, Agrawal, P. C, Paul, B, Rao, A. R, Vahia, M. N, Seetha, S, ...
The light curves of the galactic superluminal X-ray transient source GRS1915+105 observed with the pointed proportional counters (PPC) of Indian X-ray Astronomy Experiment (IXAE)on board IRS-P3 have...
Energy dependence of x-ray pulse profile of the crab pulsar (1999)
Mukerjee, K, Agrawal, P. C, Paul, B, Rao, A. R, Vahia, M. N, Yadav, J. S, ...
We obtained pulse profiles of Crab pulsar in 4 different X-ray energy bands between 2 and 30 keV. We found that all the profiles in these energy ranges show two peaks occurring at the same phase...
Paul, B., Agrawal, P. C., Rao, A. R.
The galactic superluminal transient X-ray source GRS 1915+105 was observed with the pointed proportional counters (PPCs) onboard the Indian satellite IRS-P3 during 1996 July 23-27. We report here...
Rao, A. R., Agrawal, P. C., Paul, B.
We present the time variability characteristics of Cygnus X-1 in its two spectral states. The observations were carried out using the Pointed Proportional Counters (PPC) on-board the Indian X-ray...
Paul, B., Agrawal, P. C., Rao, A. R.
Three different types of very intense, quasi-regular X-ray bursts have been observed from the Galactic superluminal X-ray transient source GRS 1915+105 with the Pointed Proportional Counters of the...
Broad band X-ray spectrum of Cygnus X-1 (1997)
Chitnis, V. R., Rao, A. R., Agrawal, P. C.
We present the hard X-ray (20-100 keV) observations of Cygnus X-1 obtained using a large area balloon-borne Xenon filled Multi-anode Proportional Counter (XMPC) telescope. The observations were...
X-Ray Astronomy Experiment On The Indian Satellite Irs-P3 (1997)
P. C. Agrawal, B. Paul, A. R. Rao, M. R. Shah, K. Mukerjee, M. N. Vahia, ...
An x-ray astronomy experiment consisting of three collimated proportional counters and an X-ray Sky Monitor (XSM) was flown aboard the Indian Satellite IRS-P3 launched on March 21, 1996 from SHAR...
Hard X-Ray Pulsations In Gx 1+4 (1997)
P. C. Agrawal, B. Paul, A. R. Rao, R. K. Manch
The x-ray pulsar GX 1+4 was observed by us in four balloon- borne experiments carried out from Hyderabad, India during 1991-1995 period with a hard x-ray telescope. The x-ray telescope consists of...
Rapid X-ray variability of the superluminal source GRS1915+105 (1997)
Paul, B., Agrawal, P. C., Rao, A. R.
The superluminal X-ray transient source GRS 1915+105 was observed during July 20-29, 1996 with the Indian X-ray Astronomy Experiment (IXAE) on the Indian satellite IRS-P3 launched on March 21, 1996...
A double peaked pulse profile observed in GX 1+4 (1997)
Paul, B., Agrawal, P. C., Rao, A. R., Manchanda, R. K.
The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight made on 22 March...
A double peaked pulse profile observed in GX 1 + 4 (1996)
Paul, B, Agrawal, P. C, Rao, A. R, Manchanda, R. K
The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight made on 22 March...
HER X-1 observed in a low state (1996)
Paul, B, Agrawal, P. C, Rao, A. R, Manchanda, R. K
The X-ray pulsar Her X-1 was observed on 14th December, 1992 with two balloon borne Xenon filled multicell proportional counters (XMPC) from Hyderabad, India. The source intensity was found to be...
Hard X-ray spectra of some X-ray binaries from balloon-borne observations (1993)
Chitnis, V. R, Agrawal, P. C, Manchanda, R. K, Rao, A. R
We have studied X-ray binaries 4U1907 + 09, GX1 + 4 and Cygnus X-1 in the energy range 20-100 keV, using balloon-borne xenon-filled multilayer proportional counters flown from Hyderabad, India....