IIAP Publications: Recent submissions

  • An Estimation of the Geometrical Structure of Polar Cap and Emission Property of Radio Pulsar: A Treatment from an Analytical Approach 
    Roy, Tridib (IOP Publishing, 2023-04)
    Pulsars are believed to be one of the most interesting objects in the universe. The emission mechanism of pulsars is still a conundrum to physicists, as there is no completely acceptable theory that can establish a consensus ...
  • Globular Cluster UVIT Legacy Survey (GlobULeS) – II. Evolutionary status of hot stars in M3 and M13 
    Kumar, Ranjan; Pradhan, Ananta C; Sahu, Snehalata; Subramaniam, A; Piridi, Sonika; Cassisi, Santi; Ojha, Devendra K (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the GC UVIT Legacy Survey programme (GlobULeS). We use observations made ...
  • UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at ∼ 0.35 kpc resolution 
    Rakhi, R; Santhosh, Geethika; Joseph, Prajwel; George, Koshy; Subramanian, S; Kavila, Indulekha; Postma, J; Duc, Pierre-Alain; Cote, Patrick; Cortese, Luca; Ghosh, S. K; Subramaniam, A; Tandon, Shyam; Hutchings, John; Wesley, P. Samuel; Bharadwaj, Aditya; Niroula, Neeran (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    NGC 5291, an early-type galaxy surrounded by a giant H I ring, is believed to be formed from collision with another galaxy. Several star forming complexes and tidal dwarf galaxies are distributed along the collisional ...
  • A Comprehensive Model of Morphologically Realistic Cosmic Dust Particles: An Application to Mimic the Unusual Polarization Properties of the Interstellar Comet 2I/Borisov 
    Halder, Prithish; Sengupta, S (American Astronomical Society, 2023-04-10)
    The cosmic dust particles found in space are mainly porous aggregates of smaller grains. Theoretically, these aggregates are replicated using fractal geometry, assuming a cluster of spheres. Although the light ...
  • UVIT Observations of the Small Magellanic Cloud: Point-source Catalog 
    Devaraj, A; Joseph, P; Stalin, C. S; Tandon, S. N; Ghosh, S. K (American Astronomical Society, 2023-04-01)
    Three fields in the outskirts of the Small Magellanic Cloud were observed by the UltraViolet Imaging Telescope (UVIT) on board AstroSat, between 2017 December 31 and 2018 January 1. The observations were carried out on a ...
  • Origin of Quasi-periodic Pulsation at the Base of a Kink-unstable Jet 
    Mishra, S. K; Sangal, Kartika; Kayshap, Pradeep; Jelinek, Petr; Srivastava, A. K; Rajaguru, S. P (American Astronomical Society, 2023-03-10)
    We studied a blowout jet that occurred at the west limb of the Sun on 2014 August 29 using high-resolution imaging/spectroscopic observations provided by the Solar Dynamics Observatory/Atmospheric Imaging Assembly and ...
  • Observation of Alfven Waves in an ICME-HSS Interaction Region 
    Dhamane, Omkar; Raghav, Anil; Shaikh, Zubair; Panchal, Utsav; Ghag, Kalpesh; Tari, Prathmesh; Choraghe, Komal; Bhaskar, Ankush; Telloni, Daniele; Mishra, Wageesh (Springer, 2023-03)
    The Alfvén wave (AW) is the most common fluctuation present within the solar wind emitted from the Sun. Whether or not AWs can originate after the collision of an Interplanetary Coronal Mass Ejection (ICME) and a High-Speed ...
  • Full non-LTE spectral line formation II. Two-distribution radiation transfer with coherent scattering in the atom’s frame 
    Paletou, F; Sampoorna, M; Peymirat, C (EDP Sciences, 2023-03)
    In this article we discuss a method for obtaining a numerical solution to the so-called full nonlocal thermodynamic equilibrium (nonLTE) radiation transfer problem. More specifically, the usual numerical iterative methods ...
  • Classification of MODIS fire emission data based on aerosol absorption Angstrom exponent retrieved from AERONET data 
    Shantikumar, N. S; Khatri, Pradeep; Larson, E. J. L; Dumka, Umesh Chandra; Sarangi, Chandan; Vineeth, R (Elsevier B.V., 2023-02-01)
    Biomass burning emits a large quantity of gaseous pollutants and aerosols into the atmosphere, which perturbs the regional and global climate and has significant impacts on air quality and human health. In order to understand ...
  • Optical Spectroscopy of Classical Be Stars in Old Open Clusters 
    Jagadeesh, Madhu Kashyap; Mathew, Blesson; Paul, K. T; Banerjee, Gourav; Bhattacharyya, Suman; Anusha, R; Pramod Kumar, S (IOP Publishing, 2023-03)
    We performed the optical spectroscopy of 16 classical Be stars in 11 open clusters older than 100 Myr. Ours is the first spectroscopic study of classical Be stars in open clusters older than 100 Myr. We found that the Hα ...
  • Remnants of recent mergers in nearby early-type galaxies and their classification 
    Giri, Gourab; Barway, Sudhanshu; Raychaudhury, Somak (Oxford University Press on behalf of Royal Astronomical Society, 2023-04)
    We search for signatures of recent galaxy close interactions and mergers in a sample of 202 early-type galaxies in the local universe from the public SDSS Stripe82 deep images (μr ∼ 28.5 mag arcsec−2). Using two different ...
  • Temporal and Latitudinal Variations in Ca-K Plage and Network Area: An Implication for Meridional Flows 
    Priyal, M; Singh, J; Ravindra, B; Sindhuja, G (American Astronomical Society, 2023-02-20)
    The Ca-K spectroheliograms obtained at the Kodaikanal observatory are used to generate a uniform time series using the equal-contrast technique for studying the long- and short-term variations in the solar chromosphere. ...
  • Effect of Multiple Scattering on the Transmission Spectra and the Polarization Phase Curves for Earth-like Exoplanets 
    Singla, Manika; Chakrabarty, Aritra; Sengupta, S (American Astronomical Society, 2023-02-20)
    It is the most appropriate time to characterize the Earth-like exoplanets in order to detect biosignature beyond the Earth because such exoplanets will be the prime targets of big-budget missions like JWST, Roman ...
  • UOCS-IX. AstroSat/UVIT Study of the Open Cluster NGC 2818: Blue Stragglers, Yellow Stragglers, Planetary Nebula, and their Membership 
    Sharmila Rani; Pandey, G; Subramaniam, A; Kameswara Rao, N (American Astronomical Society, 2023-03-01)
    We present the first far-UV (FUV) imaging results of the intermediate-age Galactic open cluster NGC 2818 that has a planetary nebula (PN) within the field using images taken from the Ultra Violet Imaging Telescope ...
  • ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - XV. Steady accretion from global collapse to core feeding in massive hub-filament system SDC335 
    Xu, Feng-Wei; Wang, Ke; Liu, Tie; Goldsmith, Paul F; Zhang, Qizhou; Juvela, Mika; Liu, Hong-Li; Qin, Sheng-Li; Li, Guang-Xing; Tej, Anandmayee; Garay, Guido; Bronfman, Leonardo; Li, Shanghuo; Wu, Yue-Fang; Gomez, Gilberto C; Vazquez-Semadeni, Enrique; Tatematsu, Kenichi; Ren, Zhiyuan; Zhang, Yong; Toth, L. Viktor; Liu, Xunchuan; Yue, Nannan; Zhang, Siju; Baug, Tapas; Issac, Namitha; Stutz, Amelia M; Liu, Meizhu; Fuller, Gary A; Tang, Mengyao; Zhang, Chao; Dewangan, Lokesh; Lee, Chang Won; Zhou, Jianwen; Xie, Jinjin; Wang, Chao; Liu, Rong; Luo, Qiuyi; Archana Soam; Eswaraiah, Chakali (Oxford University Press on behalf of Royal Astronomical Society, 2023-04)
    We present ALMA Band-3/7 observations towards ‘the Heart’ of a massive hub-filament system (HFS) SDC335, to investigate its fragmentation and accretion. At a resolution of ∼0.03 pc, 3 mm continuum emission resolves two ...
  • Image Quality Specification for Solar Telescopes 
    Saraswathi Kalyani, S; Sridharan, R (Springer, 2023-01)
    Modern large ground-based solar telescopes are invariably equipped with adaptive optics systems to enhance the high angular resolution imaging and spectroscopic capabilities in the presence of Earth's atmospheric turbulence. ...
  • From maximum force to the field equations of general relativity and implications 
    Kenath, Arun; Schiller, Christoph; Sivaram, C (World Scientific Publishing, 2022-10-15)
    There are at least two ways to deduce Einstein’s field equations from the principle of maximum force c4/4G or from the equivalent principle of maximum power c5/4G . Tests in gravitational wave astronomy, cosmology, and ...
  • An empirical relation to estimate host galaxy stellar light from AGN spectra 
    Jalan, Priyanka; Rakshit, Suvendu; Woo, Jong-Jak; Kotilainen, Jari; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-05)
    Measurement of black hole mass for low-z (z≤ 0.8) Active Galactic Nuclei (AGNs) is difficult due to the strong contribution from host galaxy stellar light necessitating detailed spectral decomposition to estimate the AGN ...
  • Photometric variable stars in the young open cluster NGC 6823 
    Lata, Sneh; Chen, W. P; Pandey, J. C; Dileep, Athul; Ai, Zhong-Han; Hojaev, Alisher S; Panwar, Neelam; Joshi, Santosh; Mondal, Soumen; Biswas, Siddhartha; Bhatt, B. C (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    We present stellar variability towards the young open cluster NGC 6823. Time series V- and I-band CCD photometry led to identification and characterization of 88 variable stars, of which only 14 have been previously ...
  • The Solar Ultra-Violet Imaging Telescope (SUIT) Onboard Intelligence for Flare Observations 
    Varma, Manoj; Padinhatteri, Sreejith; Sinha, Sakya; Tyagi, Anurag; Burse, Mahesh; Yadav, Reena; Kumar, Ghanshyam; Ramaprakash, Anamparambu; Tripathi, Durgesh; Sankarasubramanian, K; Nagaraju, K; Vadodariya, Koushal; Tadepalli, Srikar; Deogaonkar, Rushikesh; Olekar, Manjunath; Azaruddin, Mohamed; Unnikrishnan, Amrita (Springer, 2023-02)
    Aditya-L1 is India’s first observatory-class solar space mission to study the Sun from the Lagrange L1 point. The Solar Ultra-Violet Imaging Telescope (SUIT) is one of the payloads onboard Aditya-L1. SUIT is an off-axis ...

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