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Aryabhatta Research Institute of Observational Sciences: Recent submissions

Now showing items 281-300 of 1451

Intra-night optical monitoring of three γ -ray detected narrow-line Seyfert 1 galaxies

Ojha, Vineet; Krishna, Gopal-; Chand, Hum (Monthly notices of the Royal Astronomical Society, 2019-03)

For three radio-loud γ -ray detected narrow-line Seyfert 1 (γ -ray NLSy1) galaxies, we report optical variability on intra-night and/or week-like time-scales, based on five ≥ 3 h long monitoring sessions for each galaxy. ...
Atmospheric dynamics associated with exceptionally dusty conditions over the eastern Mediterranean and Greece in March 2018

Kaskaoutis, D.G.; Dumka, U.C. (Atmospheric Research, Elsevier, 2019-04)

This study examines the atmospheric dynamics that facilitated frequent and intense dust storms over the eastern Mediterranean in March 2018 via the synergy of satellite observations, ground-based measurements and reanalysis. ...
A multiwavelength view of a classical T Tauri star CV Cha

Pandey, Jeewan Chandra; Karmakar, Subhajeet; Joshi, Arti; Sharma, Saurabh; Pandey, Shashi Bhushan; Pandey, Anil Kumar (Research in Astronomy and Astrophysics, 2019-01)

Using long-term optical, ultraviolet (UV) and X-ray data, we present a study of a classical T Tauri star CV Cha. The V -band light curve obtained from the All Sky Automated Survey (ASAS) shows short as well as long-term ...
On the Differential Rotation of Stars.

Savanov, I. S.; Dmitrienko, E. S.; Pandey, J. C.; Karmakar, S. (Astrophysical Bulletin, 2018-10)

We discuss methods for analyzing the observational manifestations of differential rotation (DR). Based on the literary sources and our estimates (for 4 cool dwarfs), a list containing 75 stars was compiled. Using an ...
Effects of Monsoon, Shamal and Levar winds on dust accumulation over the Arabian Sea during summer – The July 2016 case.

Rashki, A. et al.; Dumka, U. C. (Aeolian Research, Elsevier, 2019-02)

This study examines the atmospheric circulation patterns that are associated with contrasting wind regimes, desert dust outflows and accumulation of dust over the Arabian Sea in the summer season. The examined period is ...
Mass function and dynamical study of the open clusters Berkeley 24 and Czernik 27 using ground based imaging and Gaia astrometry.

Bisht, D.; Yadav, R. K. S. (Monthly Notices of the Royal Astronomical Society, 2019-01)

We present a UBVI photometric study of the open clusters Berkeley 24 (Be 24) and Czernik 27 (Cz 27). The radii of the clusters are determined as 2. 7 and 2. 3 for Be 24 and Cz 27, respectively. We use the Gaia Data ...
The radial distribution of blue stragglers in Galactic globular cluster NGC 6656 − clues to the dynamical status.

Singh, Gaurav; Yadav, R. K. S. (Monthly notices of the Royal Astronomical Society, 2019-02)

We present the dynamical status of the Galactic globular cluster NGC 6656 using the spatial distribution of blue straggler stars (BSSs). A combination of multi-wavelength high-resolution space- and ground-based data are ...
Radiation driving and heating of general relativistic jets under a Compton-scattering regime

Vyas, Mukesh K.; Chattopadhyay, Indranil (Monthly notices of the royal astronomical society, 2019-01)

Interaction of intense radiation from the underlying accretion disc with a steady, generalrelativistic jet is studied. The radiation field imparts momentum as well as energy to the outflowing jet under Compton scattering. ...
Elevated Black Carbon Concentrations and Atmospheric Pollution around Singrauli Coal-Fired Thermal Power Plants (India) Using Ground and Satellite Data.

Singh, Ramesh P.; Kumar, Sarvan; Singh, Abhay K. (International journal of environmental research and public health., 2018-11)

The tropospheric NO2 concentration from OMI AURA always shows high concentrations of NO2 at a few locations in India, one of the high concentrations of NO2 hotspots is associated with the locations of seven coal-fired ...
Low-frequency View of GW170817/GRB 170817A with the Giant Metrewave Radio Telescope.

Resmi, L. et al.; Misra, K. (Astrophysical journal, 2018-11)

The short gamma-ray burst (GRB) 170817A was the first GRB associated with a gravitational-wave event. Due to the exceptionally low luminosity of the prompt γ-ray and the afterglow emission, the origin of both radiation ...
Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters.

Dey, Lankeswar et al.; Gopinathan, M.; Joshi, A.; Pandey, J. C. (Astrophysical journal, 2018-10)

Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the ...
Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours.

Goyal, A. et al.; Joshi, A.; Gopinathan, M.; Pandey, J. C. (Astrophysical journal, 2018-08)

We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the FermiLAT survey at high-energy γ-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite in ...
Activity of Young Dwarfs with Planetary Systems: EPIC 211901114 and K2–33.

Savanov, S.; Dmitrienko, E. S.; Karmakar, S.; Pandey, J. C. (Astronomy reports, 2018-08)

The results of an analysis of the activity of the young stars with planetary systems EPIC 211901114 and K2–33 based on observational data obtained over 70 days with the Kepler Space Telescope are presented. The rotation ...
Year-long variability of the fossil fuel and wood burning black carbon components at a rural site in southern Delhi outskirts

Dumka, U. C. et al.; Kumar, S. (Atmospheric research, Elsevier, 2019-02)

This study examines year-long (April 2015 – March 2016) measurements of black carbon (BC) concentrations acquired with a 7-wavelength Aethalometer (ΑΕ-42) at Panchgaon, in the southern Delhi outskirts. We assess the ...
Assessment of biomass burning and fossil fuel contribution to black carbon concentrations in Delhi during winter.

Dumka, U. C. et al.; Singh, N. (Atmospheric Environment, Elsevier, 2018-12)

This study aims to assess the contribution of fossil-fuel combustion (BCff) and biomass (or wood) burning (BCwb) to wintertime black carbon (BC) concentrations in Delhi using the “Aethalometer model” approach. Continuous ...
A study of a long duration B9 flare-CME event and associated shock.

Chandra, R. et al.; Uddin, W. (Advances in Space research, Elsevier, 2017-10)

We present and discuss here the observations of a small long duration GOES B-class flare associated with a quiescent filament eruption, a global EUV wave and a CME on 2011 May 11. The event was well observed by the Solar ...
Slippage of Jets Explained by the Magnetic Topology of NOAA Active Region 12035.

Joshi, R. et al.; Uddin, W. (Solar Physics, 2017-10)

We present the investigation of 11 recurring solar jets that originated from two different sites (site 1 and site 2) close to each other (≈11 Mm) in NOAA active region (AR) 12035 during 15 – 16 April 2014. The jets were ...
X-ray intraday variability of the TeV blazar Mrk 421 with Chandra.

Aggrawal, Vishi et al.; Pandey, Ashwani; Gupta, Alok C. (Monthly notices of the Royal Astronomical society, 2018-11)

We present an extensive study of 72 archival Chandra light curves of the high-frequencypeaked type blazar Mrk 421, the first strong extragalactic object to be detected at TeV energies. Between 2000 and 2015, Mrk 421 often ...
Possible ∼1 hour quasi-periodic oscillation in narrow-line Seyfert 1 galaxy MCG–06–30–15

Gupta, Alok C. et al. (Astronomy & astrophysics, 2018-08)

We found a possible ~1 h quasi-periodic oscillation (QPO) in a ~55 ks X-ray observation of the narrow-line Seyfert 1 galaxy MCG–06–30–15 made with the XMM-Newton EPIC/pn detector in the energy range 0.3–10 keV. We identify ...
Variations in surface ozone and carbon monoxide in the Kathmandu Valley and surrounding broader regions during SusKat-ABC field campaign: role of local and regional sources.

Bhardwaj, Piyush et al.; Naja, Manish (Atmospheric chemistry and physics, 2018-08)

Air pollution resulting from rapid urbanization and associated human activities in the Kathmandu Valley of Nepal has been leading to serious public health concerns over the past 2 decades. These concerns led to a multinational ...

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