57 citations · 168 across the 16 of their papers we have counts for
17 papers
JWST/MIRI Observations of PAH Emission and Evolution in H II Regions of NGC 5457
Atul Kumar Singh, Rahul Kumar Anand, Shantanu Rastogi
Aims: To investigate the physical processing of PAHs in high-mass star-forming environments. This study aims to characterize how the PAH ionization fraction varies across different…
Probing Dust and PAH Chemistry in Evolved Carbon-Rich Nebulae through Optical and Infrared Observations
Rahul Kumar Anand, Atul Kumar Singh, Saurabh Sharma +2
This study presents optical and near-infrared photometric observations, alongside mid-infrared spectroscopic data from the ISO SWS instrument, to examine potential correlations bet…
NGC 2392 and NGC 4361: Spectroscopic Diagnostics of Planetary Nebula Evolution
Atul Kumar Singh, Saurabh Sharma, Rahul Kumar Anand +3
The study presents a detailed spectroscopic analysis of the planetary nebulae (PNe) NGC~2392 and NGC~4361 using optical spectra obtained from the 2-m Himalayan Chandra Telescope (H…
Investigating open cluster King 6: Detection of three new variables
Vaibhav Kumar Pandey, Arvind K Dattatrey, Apara Tripathi +2
This study presents photometric analysis of the intermediate-age open cluster King 6, utilizing photometric data in UBV(RI) passband and data from the 2MASS mission. The Gaia D…
Research on the Interstellar Medium and Star Formation in the Galaxy: An Indian Perspective
Bhaswati Mookerjea, Maheswar G., Kinsuk Acharyya +24
Although the star formation process has been studied for decades, many important aspects of the physics involved remain unsolved. Recent advancement of instrumentation in the infra…
Optical intra-day variability of the blazar S5 0716+714
Tushar Tripathi, Alok C. Gupta, Ali Takey +18
We present an extensive recent multi-band optical photometric observations of the blazar S5 0716+714 carried out over 53 nights with two telescopes in India, two in Bulgaria, one i…
Photometric and Kinematic study of the open cluster NGC 1027
Apara Tripathi, Neelam Panwar, Saurabh Sharma +2
We present photometric and kinematic analysis of an intermediate age open cluster NGC 1027 using and Gaia Early Data Release 3 (EDR3) data. Structural and fundamental p…
Study of vibrational spectra of polycyclic aromatic hydrocarbons with phenyl side group
Anju Maurya, Rashmi Singh, Shantanu Rastogi
Computational study of polycyclic aromatic hydrocarbons (PAHs) with phenyl side group substituted at different positions is reported. The infrared spectral variations due to the po…
A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies
Vivek Kumar Jha, Hum Chand, Vineet Ojha +2
We present a comparative study of the physical properties of a homogeneous sample of 144 Narrow line Seyfert 1 (NLSy1) and 117 Broad-line Seyfert 1 (BLSy1) galaxies. These two samp…
Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey
Vivek Kumar Jha, Ravi Joshi, Hum Chand +4
We present the accretion disk size estimates for a sample of 19 active galactic nuclei (AGN) using the optical , , and band light curves obtained from the Zwicky Transien…
PAH and nbL Features Detection in Planetary Nebulae NGC 7027 and BD +303639 with TIRCAM2 Instrument on 3.6m DOT
Rahul Kumar Anand, Shantanu Rastogi, Brijesh Kumar +4
High resolution infrared imaging observations of the young Planetary Nebulae NGC 7027 and BD +303639, taken with the newly installed TIFR Infrared Camera-II (TIRCAM2) on 3.6m Devas…
Vibrational dynamics of phenylphenanthrenes with phenyl group at different positions
Rashmi Singh, Shantanu Rastogi
Polycyclic aromatic hydrocarbons (PAHs) appear to be ubiquitous in terrestrial atmosphere as well as in the interstellar medium (ISM). In the astrophysical context presence of PAHs…
Experimental and theoretical study on the infrared spectroscopy of astrophysically relevant PAH derivatives 2- and 9-vinylanthracene
Anju Maurya, Shantanu Rastogi, G. Rouillé +2
We propose to evaluate the contribution of polycyclic aromatic hydrocarbon molecules that carry side groups to the mid-infrared emission spectra. Within this framework, the IR abso…
Modeling anomalous extinction using nanodiamonds
Rakesh K Rai, Shantanu Rastogi
Modeling extinction along anomalous/non-CCM sightlines, which are characterized by a broad bump and steep far-ultraviolet (FUV) rise, is reported. The extinction along t…
Soft time lags in the X-ray emission of Mrk 1040
Shruti Tripathi, Ranjeev Misra, Gulab Dewangan +1
Temporal analysis of X-ray binaries and Active Galactic Nuclei have shown that hard X-rays react to variation of soft ones after a time delay. The opposite trend, or soft lag, has…
The scattering and extinction properties of nanodiamonds
Rakesh K Rai, Shantanu Rastogi
The study of scattering and extinction properties of possible nanodiamond grains in the ISM are reported. Calculations using Discrete Dipole Approximation (DDA) for varying ellipso…
Modeling the interstellar aromatic infrared bands with co-added spectra of PAHs
Amit Pathak, Shantanu Rastogi
The observed variations in profiles of the interstellar aromatic infrared bands correlate with the object type and are indicative of PAH populations existing i n different sources.…