52 citations
- Korea Astronomy and Space Science InstituteKR2 papers
- Max Planck Institute for AstronomyDE2 papers
- Ames Research CenterUS1 paper
- Brigham Young UniversityUS1 paper
- California Institute of TechnologyUS1 paper
- Canada–France–Hawaii TelescopeUS1 paper
- CEA Paris-Saclay - Etablissement de SaclayFR1 paper
- Centre de Recherche en Économie et StatistiqueFR1 paper
- Centre for Research in Engineering Surface TechnologyIE1 paper
- Chinese Academy of SciencesCN1 paper
- Daegu Cyber UniversityKR1 paper
- Dublin City UniversityIE1 paper
6 papers
Two types of softening detected in X-ray afterglows of Swift bursts: internal and external shock origins?
Y. -P. Qin, A. C. Gupta, J. H. Fan +1
The softening process observed in the steep decay phase of early X-ray afterglows of Swift bursts has remained a puzzle since its discovery. The softening process can also be obser…
Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714
Alok C. Gupta, Sang-Mok Cha, Sungho Lee +8
In this paper, we report results of our near-infrared (NIR) photometric variability studies of the BL Lacertae object S5 0716+714. NIR photometric observations spread over 7 nights…
Quasi-Simultaneous Two Band Optical Micro-Variability of Luminous Radio-Quiet QSOs
Alok C. Gupta, Weimin Yuan
We report the first results of quasi-simultaneous two passband optical monitoring of six quasi-stellar objects to search for micro-variability. We carried out photometric monitorin…
Primordial Mass Segregation in Starburst Stellar Clusters
Sami Dib, Mohsen Shadmehri, Maheswar Gopinathan +2
We present a model to explain the mass segregation and shallow mass functions observed in the central parts of dense and young starburst stellar clusters. The model assumes that th…
Further evidence for intra-night optical variability of radio-quiet quasars
A. Goyal, Gopal-Krishna, Ram Sagar +2
Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily sin…
Initial mass function effects on the colour evolution of disk galaxies
P. Westera, M. Samland, S. J. Kautsch +2
In this work, we want to find out if the IMF can be determined from colour images, integrated colours, or mass-to-light ratios, especially at high redshift, where galaxies cannot b…