78 citations · 362 across the 14 of their papers we have counts for
13 papers
Decimetric emission 500 away from a flaring Site: Possible scenarios from solar radio observations
Susanta Kumar Bisoi, H. S. Sawant, P. Janardhan +5
We present a study of decimetric radio activity, using the first high time cadence (0.5 s) images from the () at 610 M…
GMRT observations of IC 711 -- The longest head-tail radio galaxy known
Shweta Srivastava, Ashok K. Singal
We present low-frequency, GMRT observations at 240, 610 and 1300 MHz of IC~711, a narrow angle tail (NAT) radio galaxy. The total angular extent of the radio emission, ar…
Dissecting Galaxies: Spatial and Spectral Separation of Emission Excited by Star Formation and AGN Activity
Rebecca L. Davies, Brent Groves, Lisa J. Kewley +13
The optical spectra of Seyfert galaxies are often dominated by emission lines excited by both star formation and AGN activity. Standard calibrations (such as for the star formation…
J1216+0709 : A radio galaxy with three episodes of AGN jet activity
Veeresh Singh, C. H. Ishwara-Chandra, Preeti Kharb +2
We report the discovery of a `Triple-Double Radio Galaxy (TDRG)' J1216+0709 detected in deep low-frequency Giant Metrewave Radio Telescope (GMRT) observations. J1216+0709 is only t…
The Role of Radiation Pressure in the Narrow Line Regions of Seyfert Host Galaxies
Rebecca L. Davies, Michael A. Dopita, Lisa J. Kewley +13
We investigate the relative significance of radiation pressure and gas pressure in the extended narrow line regions (ENLRs) of four Seyfert galaxies from the integral field Siding…
A GMRT Study of Seyfert Galaxies NGC4235 & NGC4594: Evidence of Episodic Activity ?
P. Kharb, S. Srivastava, V. Singh +3
Low frequency observations at 325 and 610 MHz have been carried out for two "radio-loud" Seyfert galaxies, NGC4235 and NGC4594 (Sombrero galaxy), using the Giant Meterwave Radio Te…
The WiFeS S7 AGN survey: Current status and recent results on NGC 6300
J. Scharwächter, M. A. Dopita, P. Shastri +14
The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) is a targeted survey probing the narrow-line regions (NLRs) of a representative sample of ~140 nearby (z<0.02)…
Probing the Physics of Narrow Line Regions in Active Galaxies III: Accretion and Cocoon Shocks in the LINER NGC1052
Michael A. Dopita, I-Ting Ho, Linda L. Dressell +16
We present Wide Field Spectrograph (WiFeS) integral field spectroscopy and HST FOS spectroscopy for the LINER galaxy NGC 1052. We infer the presence of a turbulent accretion flow f…
Probing the Physics of Narrow Line Regions in Active Galaxies II: The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)
Michael A. Dopita, Prajval Shastri, Rebecca Davies +14
Here we describe the \emph{Siding Spring Southern Seyfert Spectroscopic Snapshot Survey} (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the…
S7 : Probing the physics of Seyfert Galaxies through their ENLR & HII Regions
Michael A. Dopita, Prajval Shastri, Julia Scharwachter +13
Here we present the first results from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) which aims to investigate the physics of ~140 radio-detected southern a…
GMRT radio continuum study of Wolf Rayet galaxies I: NGC 4214 and NGC 4449
Shweta Srivastava, Nimisha Kantharia, Aritra Basu +2
We report low frequency observations of Wolf-Rayet galaxies, NGC 4214 and NGC 4449 at 610, 325 and 150 MHz, using the Giant Meterwave Radio Telescope (GMRT). We detect diffuse exte…
Rectangular and Circular Antenna Design on Thick Substrate
Harsh kumar, Shweta Srivastava
Millimeter wave technology being an emerging area is still very undeveloped. A substantial research needs to be done in this area as its applications are numerous. In the present e…
Optimum Design of a 4x4 Planar Butler Matrix Array for WLAN Application
Wriddhi Bhowmik, Shweta Srivastava
In recent years, high-speed wireless communication is in vogue. In wireless communication systems, multipath fading, delay and interference occurres by reflection or diffraction. I…