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30 papers · 2 filters
Age Sequence in Small Clusters Associated with Bright-Rimmed Clouds
Katsuo Ogura, Neelam Chauhan, Anil K. Pandey +3
Bright-rimmed clouds (BRCs) found in H II regions are probable sites of triggered star formation due to compression by ionization/shock fronts, and it is hypothesized that star for…
The VVDS-VLA Deep Field: III. GMRT observations at 610 MHz and the radio spectral index properties of the sub-mJy population
M. Bondi, P. Ciliegi, T. Venturi +12
We present the low frequency (610 MHz) radio source counts of the VVDS-VLA field and investigate the radio spectral index properties of the sub-mJy population. We use new deep (r.m…
Observations of AGNs using PACT
D. Bose, V. R. Chitnis, P. R. Vishwanath +5
We report our observations on 4 AGNs viz, Mkn421, Mkn501, 1ES1426+428 and ON231 belonging to a sub-class called blazars. The observations were carried out using the Pachmarhi Array…
Simultaneous Single-Pulse Observations of Radio Pulsars: V. On the Broadband Nature of The Pulse Nulling Phenomenon in PSR B1133+16
N. D. R. Bhat, Y. Gupta, M. Kramer +3
We revisit the phenomenon of pulse nulling using high-quality single-pulse data of PSR B1133+16 from simultaneous multifrequency observations. Observations were made at 325, 610, 1…
A Multicoloured View of 2S 0114+650
S. A. Farrell, P. M. O'Neill, R. K. Sood +2
We report the results of radio and X-ray observations of the high mass X-ray binary 2S 0114+650, made with the Giant Meterwave Radio Telescope and the Rossi X-ray Timing Explorer r…
Optical Photometrical Observations and Variability for Quasar 4C 29.45
J. H. Fan, J. Tao, B. C. Qian +6
We reported the result of long term optical variability of the blazar 4C 29.45 (QSO 1156+295, Ton 599), carried out optical photometric observations in Johnson V, Cousins RI passba…
X-ray Flashes or soft Gamma-ray Bursts? The case of the likely distant XRF 040912
G. Stratta, S. Basa, N. Butler +49
In this work, we present a multi-wavelength study of XRF 040912, aimed at measuring its distance scale and the intrinsic burst properties. We performed a detailed spectral and temp…
Members of the double pulsar system PSR J0737-3039 : neutron stars or strange stars ?
Manjari Bagchi, Jishnu Dey, Sushan Konar +2
One interesting method of constraining the dense matter Equations of State is to measure the advancement of the periastron of the orbit of a binary radio pulsar (when it belongs to…
Infrared study of the Southern Galactic star forming region associated with IRAS 14416-5937
S. Vig, S. K. Ghosh, D. K. Ojha +1
Aims: We have carried out an infrared study of the southern Galactic massive star forming region associated with IRAS 14416-5937. Methods: This star forming region has been mapped…
Collisional Hardening of Compact Binaries in Globular Clusters
S. Banerjee, P. Ghosh
We consider essential mechanisms for orbit-shrinkage or "hardening" of compact binaries in globular clusters to the point of Roche-lobe contact and X-ray emission phase, focussing…
Structure of the near-surface layers of the Sun: asphericity and time variation
Sarbani Basu, H. M. Antia, Richard S. Bogart
We present results on the structure of the near-surface layers of the Sun obtained by inverting frequencies of high-degree solar modes from "ring diagrams". We have results for eig…
Discovery of hard X-ray delays in the X-ray emission of the Seyfert 1 galaxy Mrk~110: possible evidence for Comptonization
Surajit Dasgupta, A. R. Rao
We report the discovery of hard X-ray delays in the X-ray emission of the Seyfert 1 galaxy Mrk 110, based on a long XMM-Newton observation. Cross correlation between the X-ray ligh…
Explicit Cosmological Coarse Graining via Spatial Averaging
Aseem Paranjape, T. P. Singh
The present matter density of the Universe, while highly inhomogeneous on small scales, displays approximate homogeneity on large scales. We propose that whereas it is justified to…
Galaxy Clusters Associated with Short GRBs. II. Predictions for the Rate of Short GRBs in Field and Cluster Early-Type Galaxies
Min-Su Shin, Edo Berger
We determine the relative rates of short GRBs in cluster and field early-type galaxies as a function of the age probability distribution of their progenitors, P(τ) \propto τ^n. Thi…
3C254: MERLIN observations of a highly asymmetric quasar
P. Thomasson, D. J. Saikia, T. W. B. Muxlow
Multifrequency, high-resolution radio observations of the quasar 3C254 using MERLIN are presented. The quasar has a highly asymmetric radio structure, with the eastern component of…
A three stage model for the inner engine of Gamma Ray Burst: Prompt emission and early afterglow
Jan Staff, Rachid Ouyed, Manjari Bagchi
We propose a new model within the ``Quark-nova'' scenario to interpret the recent observations of early afterglows of long Gamma-Ray Bursts (GRB) with the Swift satellite. This is…
Chromo-thermal oscillations and collapse of strange stars to black holes : Astrophysical Implications
Manjari Bagchi, Rachid Ouyed, Jan Staff +3
The effects of temperature on strange stars are studied and it is found that the maximum mass of the star decreases with the increase of temperature since at high temperatures the…
Broad band X-ray spectrum of KS 1947+300 with BeppoSAX
S. Naik, P. J. Callanan, B. Paul +1
We present results obtained from three BeppoSAX observations of the accretion-powered transient X-ray pulsar KS 1947+300 carried out during the declining phase of its 2000 November…
The Wide Field Imager Lyman-Alpha Search (WFILAS) for Galaxies at Redshift ~5.7: II. Survey Design and Sample Analysis
E. Westra, D. Heath Jones, C. E. Lidman +6
Context: Wide-field narrowband surveys are an efficient way of searching large volumes of high-redshift space for distant galaxies. Aims: We describe the Wide Field Imager Lyman-Al…
The XMM-Newton view of the Crab
M. G. F. Kirsch, G. Schoenherr, E. Kendziorra +7
We discuss the current X-ray view of the Crab Nebula and Pulsar, summarising our analysis of observations of the source with the EPIC-pn camera on board the XMM-Newton observatory.…
Connection between accretion disk and superluminal radio jets and the role of radio plateau state in GRS 1915+105
J. S. Yadav
We investigate the association between the accretion disk during radio plateau state and the following superluminal relativistic radio jets with peak intensity varies from 200 mJy…
Black-Hole Accretion Disc as an Analogue Gravity Model
Tapas Kumar Das, Neven Bilic, Surajit Dasgupta
We formulate and solve the equations governing the transonic behaviour of a general relativistic black-hole accretion disc with non-zero advection velocity. We demonstrate that a r…
Evolution of the periodicities in 2S 0114+650
Ravi Sood, Sean Farrell, Paul O'Neill +2
We have analysed nine years of data from the All Sky Monitor on the Rossi X-ray Timing Explorer for 2S 0114+650 to study the evolution of its spin, binary and super-orbital periods…
Determining solar abundances using helioseismology
H. M. Antia, Sarbani Basu
The recent downward revision of solar photospheric abundances of Oxygen and other heavy elements has resulted in serious discrepancies between solar models and solar structure as d…