IIA Institutional Repository: Recent submissions

  • Discovery of a large HI ring around the quiescent galaxy AGC 203001 
    Bait, Omkar; Kurapati, Sushma; Duc, Pierre-Alain; Cuillandre, Jean-Charles; Wadadekar, Yogesh; Kamphuis, Peter; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large (∼115 kpc in diameter) H I ring, located around a massive quenched galaxy, AGC 203001, but off-centred with respect to it. This ...
  • Photoionization modelling of quiescence-phase spectra of novae and a symbiotic star 
    Mondal, Anindita; Das, Ramkrishna; Anupama, G. C; Mondal, Soumen (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    Using observed and published spectra in the optical region, we have studied a handful of novae and symbiotic stars that show novae-like variability in the quiescence phase. We present results for the novae ...
  • The Intriguing Parsec-scale Radio Structure in the “Offset AGN” KISSR 102 
    Kharb, P; Lena, D; Paragi, Z; Subramanian, S; Vaddi, S; Das, M; Khatun, R (IOP Publishing, 2020-02-10)
    We report the detection of an intriguing parsec-scale radio source in the "offset AGN" candidate, KISSR 102. The elliptical host galaxy includes two optical nuclei at a projected separation of 1.54 kpc, N1 and N2, to the ...
  • X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure 
    Joshi, Ravi; Gopal Krishna; Yang, Xiaolong; Shi, Jingjing; Yu, Si-Yue; Wiita; Paul J.; Ho, Luis C.; Wu, Xue-Bing; An, Tao; Wang, Ran; Subramanian, S; Yesuf, Hassen (IOP Publishing, 2019-12)
    In pursuit of clues to the origin of “ winged ” or X-shaped radio galaxies ( XRGs ) we investigate the parent galaxies of a large sample of 106 XRGs for optical – radio axes alignment, interstellar medium, black ...
  • GASP XXIII: A Jelly fi sh Galaxy as an Astrophysical Laboratory of the Baryonic Cycle 
    Poggianti, Bianca M.; Ignesti, Alessandro; Gitti, Myriam Gitti; Wolter, Anna; Brighenti, abrizio; Biviano, Andrea; George, K; Vulcani, enedetta; Gullieuszik, Marco; Moretti, Alessia; Paladino, Rosita; Bettoni, Daniela; Franchetto, Andrea; Jaffe, Yara L.; Radovich, Mario; Roediger, Elke; Tomicic, Neven; Tonnesen, Stephanie (IOP Publishing, 2019-12)
    With MUSE, Chandra , VLA, ALMA, and UVIT data from the GAS P program, we study the multiphase baryonic components in a jelly fi sh galaxy ( JW100 ) with a stellar mass 3.2 × 10 11 M e hosting an active ...
  • SN 2017gmr: An Energetic Type II-P Supernova with Asymmetries 
    Andrews, Jennifer E.; Sand, D. J.; Valenti, S.; Smith, Nathan; Dastidar, Raya; Sahu, D. K.; Misra, Kuntal; Singh, A; Hiramatsu, D; Brown, P. J.; Hosseinzadeh, G.; Wyatt, S.; Vinko, J.; Anupama, G. C; & 62 Co-authors (IOP Publishing, 2019-12)
    We present high-cadence UV, optical, and near-infrared data on the luminous Type II-P supernova SN 2017gmr from hours after discovery through the fi rst 180 days. SN 2017gmr does not show signs of narrow, ...
  • The intrinsic reddening of the magellanic clouds as traced by background galaxies – I. The bar and outskirts of the small magellanic cloud 
    Bell, Cameron P. M; Cioni, Maria-Rosa L.; Wright, A. H; Rubele, Stefano; Nidever, David L.; Tatton, Ben L; van Loon, Jacco Th.; Ivanov, Valentin D.; Subramanian, S; Oliveira, Joana M; Grijs, Richard de; Pennock, Clara M.; Choi, Yumi; Olsen, Knut; Niederhofer, Florian; Choudhury, Samyaday; Delgado, David Mart ́ınez; Munoz, Ricardo R. (Oxford University Press on behalf of the Royal Astronomical Society, 2019-12)
    We present a method to map the total intrinsic reddening of a foreground extinguish- ing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement ...
  • Detection of fluorine in hot extreme helium stars 
    Bhowmick, A; Pandey, G; Lambert, D. L (IOP Publishing, 2020-03-01)
    The main objective of this paper is to explore abundances of fluorine in hot Extreme Helium Stars (EHes). Overabundance of fluorine is a chara cteristic feature for cool EHes and R Coronae Borealis (RCB) stars and ...
  • Morphology of CMB fields—effect of weak gravitational lensing 
    Goyal, Priya; Pravabati, C; Appleby, S (IOP Publishing, 2020-02)
    We study the morphology of the cosmic microwave background temperature and polarization fields using the shape and alignment parameters, β and α, that are constructed from the contour Minkowski tensor. The primary goal of ...
  • Estimation and correction of the instrumental perturbations of Vainu Bappu Telescope Echelle spectrograph using a model-based approach 
    Chamarthi, Sireesha; Banyal, R. K; Sriram, S (SPIE-The International Society for Optical Engineering, 2019-11)
    The Echelle spectrograph operating at Vainu Bappu Telescope (VBT), India, is a general purpose instrument used for many high-resolution spectroscopic observations. A concerted effort is being made to expand the scientific ...
  • Nearly Century-scale Variation of the Sun’s Radius 
    Hiremath, K. M; Rozelot, J. P; Sarp, V; Kilcik, A; Pavan, D. G; Gurumath, S. R (IOP Publishing, 2020-03-10)
    The Kodaikanal Archive Program (India) is now available to the scientific community in digital form as daily digitized solar white light pictures, from 1923 to 2011. We present here the solar radius data, obtained after a ...
  • CS Depletion in Prestellar Cores 
    Kim, Shinyoung; Lee, Chang Won; Maheswar, G; Tafalla, Mario; Sohn, Jungjoo; Kim, Gwanjeong; Kim, Mi-Ryang; Archana Soam; Myers, P. C (IOP Publishing, 2020-03-10)
    The CS molecule is known to be adsorbed onto dust in cold and dense conditions, causing it to be significantly depleted in the central region of cores. This study is aimed to investigate the depletion of the CS molecule ...
  • Morphology of 21cm brightness temperature during the Epoch of Reionization using Contour Minkowski Tensor 
    Akanksha, K; Pravabati, C; Appleby, S (IOP Publishing, 2019-09)
    We use morphological descriptors, Betti numbers and Contour Minkowski Tensor (CMT) on 21cm brightness temperature excursion sets, to study the ionization and heating history of the intergalactic medium (IGM) during and ...
  • Time-latitude distribution of prominences for 10 solar cycles: a study using Kodaikanal, Meudon, and Kanzelhohe data 
    Chatterjee, S; Manjunath, H; Banerjee, D; Ravindra, B; McIntosh, Scott W (Wiley-Blackwell Publishing Ltd, 2020-03)
    Solar prominences are structures of importance because of their role in polar field reversal. We study the long-term variation of the time latitude distribution of solar prominences in this article. To accomplish this, ...
  • Chasing the Total Solar Eclipse 2019 
    Kapoor, R. C (NISCAIR-CSIR, India, 2019-09)
    A solar eclipse with a totality of a rather long duration took place on 2 July 2019. The path of totality started east of New Zealand in the southern Pacific Ocean and passed over parts of Chile and Argentina. The maximum ...
  • Fizeau mask interferometry of solar features using the multi-application solar telescope at the udaipur solar observatory 
    Bayanna, A. R; Venkatakrishnan, P; Rengaswamy, S; Mathew, S. K. (Springer, 2020-02)
    Efforts are made to demonstrate high-resolution observations of the solar atmosphere using spatial interferometry. Covering the telescope pupil with a Fizeau mask consisting of two small circular apertures separated by a ...
  • Connecting galaxy structure and star formation: the role of environment in formation of S0 galaxies 
    Mishra, K. P; Wadadekar, Y; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08)
    In this work, we investigate the reason behind the increased occurrence of S0 galaxies in high-density environments. Our sample comprises of ∼2500 spiral and ∼2000 S0 galaxies spanning a wide range of environments. Dividing ...
  • Radio emission from pulsars due to relativistic plasma 
    Roy, Tridib; Gangadhara, R. T. (IOP Publishing, 2019-07)
    Pulsar radio emission is not well understood because of a lack of knowledge about the emission geometry and the plasma process involved. We develop a mechanism for pulsar radio emission that takes into account the ...
  • Mean field solar surface dynamo in the presence of partially ionized plasmas and sub-surface shear layer 
    Paradkar, B. S; Chitre, S. M; Krishan, V (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    A non-linear α − Ω dynamo in the partially ionized turbulent plasma in the presence of sub-surface velocity shear is studied with mean-field electrodynamics. Such a dynamo is probably operational in the near-surface region ...
  • Binary star detection in the open cluster King 1 field 
    Saleh, P. R; Hazarika, D; Dar, A. A; Parihar, P. S; Saikia, E (IOP Publishing, 2020-03)
    A rarely studied open cluster, King 1 is observed using the 1.3-m telescope equipped with a 2k × 4k CCD at Vainu Bappu Observatory, India. We analyze the photometric data obtained from CCD observations in both B and V ...

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