IIA Institutional Repository: Recent submissions

  • ATOMS: ALMA three-millimeter observations of massive star-forming regions – XVIII. On the origin and evolution of dense gas fragments in molecular shells of compact H II regions 
    Zhang, Siju; Liu, Tie; Wang, Ke; Zavagno, A; Garay, Guido; Liu, Hong-li; Xu, Feng-wei; Liu, Xunchuan; Sanhueza, Patricio; Archana Soam; Zhou, Jian-wen; Li, Shanghuo; Goldsmith, Paul F; Zhang, Yong; Chibueze, J. O; Lee, Chang Won; Hwang, Jihye; Bronfman, Leonardo; Dewangan, L. K (Oxford University Press on behalf of Royal Astronomical Society, 2024-12)
    Fragmentation and evolution for the molecular shells of the compact H II regions are less explored compared to their evolved counterparts. We map nine compact H II regions with a typical diameter of 0.4 pc that are surrounded ...
  • High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616) 
    Ikonnikova, N. P; Parthasarathy, M; Shaposhnikov, Ivan A; Hubrig, S; Sarkar, Geetanjali (Springer Nature, 2024-12)
    An analysis of the high-resolution (R∼48000) optical spectrum of hot (B1Ibe) post-AGB star LS 4331 (IRAS 17381‑1616) is presented. The detailed identification of the observed absorption and emission features in the wavelength ...
  • Stellar substructures in the galactic disc and halo: properties, origins, and evolution 
    Deepak (Springer Nature, 2024-12)
    Spatial, kinematic, and orbital properties, along with ages and chemical compositions of the thin disc, thick disc, and various stellar substructures in the halo, are studied based on data from the LAMOST and Gaia surveys. ...
  • Design requirements of a spectropolarimeter for solar extreme-ultraviolet observations and characterization of a K-mirror based on Brewster's angle 
    Khan, Raveena; Radhika, Dharmadhikari; Mathur, Harsh; Nagaraju, K; Jain, Sinchana R; Phanindra, D. V. S; Sagayanathan, K (Optica Publishing Group, 2024-12-01)
    Measuring the linear polarization signal in extreme-ultraviolet (EUV) spectral lines, produced by the Hanle effect, offers a promising technique for studying magnetic fields in the solar corona. The required signal-to-noise ...
  • A tale of NGC 3785: The formation of an ultra-diffuse galaxy at the end of the longest tidal tail 
    Watts, Chandan; Barway, Sudhanshu; Bait, Omkar; Wadadekar, Y (EDP Sciences, 2024-11)
    Aims. We present the discovery of an extended and faint tail observed in the isolated environment associated with galaxy NGC 3785. This study additionally provides observational evidence supporting the formation of ...
  • Detection of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650 
    Bharathan, Athira M; Stalin, C. S; Chatterjee, Rwitika; Sahayanathan, S; Pal, Indrani; Mathew, Blesson; Agrawal, V. K (Indian Academy of Sciences, 2024-11)
    We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochs of observations from the Imaging X-ray Polarimetry Explorer, we detected polarization in the 2–8 keV ...
  • The stellar bar–dark matter halo connection in the TNG50 simulations 
    Ansar, Sioree; Mousumi Das (American Astronomical Society, 2024-11-10)
    Stellar bars in disk galaxies grow as stars in near-circular orbits lose angular momentum to their environments, including their dark matter (DM) halo, and transform into elongated bar orbits. This angular momentum exchange ...
  • New results on the onset of a coronal mass ejection from 5303 Å emission line observations with VELC/ADITYA-L1 
    Ramesh, R; Priyal, M; Singh, Jagdev; Sasikumar Raja, K; Savarimuthu, P; Priya, Gavshinde (American Astronomical Society, 2024-11-20)
    We report on the onset of a coronal mass ejection (CME) using spectroscopic observations in the 5303 Å coronal emission line with the Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1, the recently launched first ...
  • On the properties of X-Ray corona in Seyfert 1 galaxies 
    Pal, Indrani; Anju, A; Sreehari, H; Rameshan, Gitika; Stalin, C. S; Ricci, Claudio; Marchesi, S (American Astronomical Society, 2024-11-20)
    We carried out a uniform and systematic analysis of a sample of 112 nearby bright Seyfert 1 type active galactic nuclei, the observations of which were carried out by the Nuclear Spectroscopic Telescope Array between 2013 ...
  • More on jacobi metric: Randers–Finsler metrics, frame dragging and geometrisation techniques 
    Chanda, Sumanto (Springer Nature, 2024-11)
    In this article, I demonstrate a new method to derive Jacobi metrics from Randers–Finsler metrics by introducing a more generalised approach to Hamiltonian mechanics for such spacetimes and discuss the related applications ...
  • A summary of instruments proposed for observing pulsating variables from the Mt. Abu observatory 
    Mishra, Anwesh Kumar; Sarkar, Deekshya Roy; Prajapati, P; Singh, Alka; Kasarla, Prashanth K; Ganesh, S (Springer Nature, 2024-11)
    Pulsating variables play a significant role in shaping modern astronomy. Presently it is an exciting era in observational study of variable stars owing to surveys like OGLE and TESS. The vast number of sources being ...
  • Detection of the Fe K lines from the binary AGN in 4C+37.11 
    Mondal, Santanu; Mousumi Das; Rubinur, K; Bansal, Karishma; Nath, Aniket; Taylor, G. B (EDP Sciences, 2024-11)
    We report the discovery of the Fe K line emission at ∼6.62−0.06+0.06 keV with a width of ∼0.19−0.05+0.05 keV using two epochs of Chandra archival data for the nucleus of the galaxy 4C+37.11, which is known to host a binary ...
  • Evolution of axial perturbations in a non-rotating uncharged primordial black hole 
    Sarkar, Arnab; Molla, Sabiruddin; Nayak, K. Rajesh (Springer Nature, 2024-10)
    We derive the equation governing the axial-perturbations in the space-time of a nonrotating uncharged primordial black hole (PBH), produced in early Universe, whose metric has been taken as the generalized McVittie metric. ...
  • Ultraviolet flux and spectral variability study of blazars observed with UVIT/AstroSat 
    Reshma, M; Agarwal, Aditi; Stalin, C. S; Joseph, P; Dagore, A; Mandal, A. K; Devaraj, A; Gudennavar, S. B (American Astronomical Society, 2024-11-01)
    Blazars, the peculiar class of active galactic nuclei, are known to show flux variations across the accessible electromagnetic spectrum. Though they have been studied extensively for their flux variability characteristics ...
  • Searching for gravitational wave optical counterparts with the zwicky transient facility: summary of O4a 
    Ahumada, Tomas; Anand, Shreya; Coughlin, Michael W; Gupta, Vaidehi; Kasliwal, Mansi M; Karambelkar, Viraj R; Stein, Robert D; Waratkar, Gaurav; Swain, Vishwajeet; Jegou du Laz, Theophile; Anumarlapudi, Akash; Andreoni, Igor; Bulla, Mattia; Srinivasaragavan, Gokul P; Toivonen, Andrew; Wold, Avery; Bellm, Eric C; Cenko, S. Bradley; Kaplan, David L; Sollerman, Jesper; Bhalerao, Varun; Perley, Daniel A; Salgundi, Anirudh; Suresh, Aswin; Hinds, K. -Ryan; Reusch, Simeon; Necker, Jannis; Cook, David O; Pletskova, Natalya; Singer, Leo P.; Banerjee, Smaranika; Barna, Tyler; Copperwheat, Christopher M; Healy, Brian; Kiendrebeogo, R. Weizmann; Kumar, Harsh; Kumar, Ravi; Pezzella, Marianna; Carracedo, Ana Sagues; Sravan, Niharika; Bloom, Joshua S; Chen, Tracy X; Graham, Matthew J; Helou, George; Laher, Russ R; Mahabal, Ashish A; Purdum, Josiah; Anupama, G. C; Barway, Sudhanshu; Basu, Judhajeet; Raman, Dhananjay; Roychowdhury, Tamojeet (IOP Publishing, 2024-11)
    During the first half of the fourth observing run (O4a) of the International Gravitational Wave Network, the Zwicky Transient Facility (ZTF) conducted a systematic search for kilonova (KN) counterparts to binary neutron ...
  • A sky survey of ultraviolet sources observed through AstroSat’s UVIT: A point source catalogue 
    Bordoloi, Swagat; Shalima, P; Gogoi, Rupjyoti; Murthy, J (Cambridge University Press on behalf of Astronomical Society of Australia, 2024-11)
    The Ultra Violet Imaging Telescope (UVIT) onboard India’s first dedicated multiwavelength satellite AstroSat observed a significant fraction of the sky in the ultraviolet with a spatial resolution of 1.4. We present a ...
  • Low-resolution transit spectroscopy of three hot Jupiters using the 2 m Himalayan Chandra telescope 
    Unni, Athira; Sivarani, T; Goyal, Jayesh; Joshi, Yogesh C; Oza, Apurva V; Banyal, R. K (Oxford University Press on behalf of Royal Astronomical Society, 2024-11)
    Here, we present the low-resolution transmission spectroscopy of three giant planets using the Himalayan Faint Object Spectrograph Camera (HFOSC) on the 2 m Himalayan Chandra Telescope (HCT) in Hanle, India. It is the first ...
  • Study of evolution and geo-effectiveness of coronal mass ejection–coronal mass ejection interactions using magnetohydrodynamic simulations with SWASTi framework 
    Mayank, Prateek; Lotz, Stefan; Vaidya, Bhargav; Mishra, Wageesh; Chakrabarty, D (American Astronomical Society, 2024-11-20)
    The geo-effectiveness of coronal mass ejections (CMEs) is a critical area of study in space weather, particularly in the lesser-explored domain of CME–CME interactions and their geomagnetic consequences. This study leverages ...
  • Radio morphology of gamma-ray sources: Double-lobed radio sources 
    Paliya, Vaidehi S; Saikia, D. J; Dominguez, Alberto; Stalin, C. S (American Astronomical Society, 2024-11-20)
    The extragalactic γ-ray sky is dominated by relativistic jets aligned to the observer's line of sight, i.e., blazars. A few of their misaligned counterparts, e.g., radio galaxies, are also detected with the Fermi-Large ...
  • Spectrophotometric reverberation mapping of intermediate-mass black hole NGC 4395 
    Pandey, Shivangi; Rakshit, S; Chand, Krishan; Stalin, C. S; Cho, Hojin; Woo, Jong-Hak; Jalan, P; Mandal, A. K; Omar, A; Jose, Jincen; Gupta, Archana (American Astronomical Society, 2024-11-20)
    Understanding the origins of massive black hole seeds and their coevolution with their host galaxy requires studying intermediate-mass black holes (IMBHs) and estimating their mass. However, measuring the masses of these ...

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