IIA Institutional Repository: Recent submissions

  • UOCS. IV. discovery of diverse hot companions to blue stragglers in the old open cluster King 2 
    Jadhav, Vikrant V; Pandey, Sindhu; Subramaniam, A; Sagar, R (Indian Academy of Sciences, 2021-10)
    King 2, one of the oldest clusters in the Milky Way, with an age of ∼6 Gyr and distance of ∼5700 pc, has been observed with UVIT payload on the AstroSat. With membership information derived from Gaia EDR3, the cluster is ...
  • A comparison of the UV and HI properties of the extended UV (XUV) disk galaxies NGC 2541, NGC 5832 and ESO406-042 
    Mousumi Das; Yadav, J; Patra, N; Dwarakanath, K. S; McGaugh, S. S; Schombert, J; Rahna, P. T; Murthy, J (Indian Academy of Sciences, 2021-10)
    We present a UV study of 3 extended UV (XUV) galaxies that we have observed with the UVIT and the GMRT. XUV galaxies show filamentary or diffuse star formation well beyond their optical disks, in regions where the disk ...
  • The sharpest ultraviolet view of the star formation in an extreme environment of the nearest Jellyfish Galaxy IC 3418 
    Hota, Ananda; Devaraj, A; Pradhan, A. C; Stalin, C. S; George, Koshy; Mohapatra, Abhisek; Rey, Soo-Chang; Ohyama, Youichi; Vaddi, Sravani; Pechetti, Renuka; Ramya, S; Jose, Jessy; Roy, Jayashree; Konar, Chiranjib (Indian Academy of Sciences, 2021-10)
    We present the far ultraviolet (FUV) imaging of the nearest Jellyfish or Fireball galaxy IC3418/VCC 1217, in the Virgo cluster of galaxies, using Ultraviolet Imaging Telescope (UVIT) onboard the AstroSat satellite. The ...
  • An Insight into the coupling of CME kinematics in inner and outer corona and the imprint of source regions 
    Majumdar, Satabdwa; Ritesh Patel; Pant, V; Banerjee, D (IOP Publishing, 2021-10-01)
    Despite studying coronal mass ejections (CMEs) for several years, we do not yet have a complete understanding of their kinematics. To this end, it is essential to understand the change in kinematics of the CMEs as they ...
  • The Nature of jets in double-peaked emission-line AGN in the KISSR sample 
    Kharb, P; Subramanian, S; Mousumi Das; Vaddi, S; Paragi, Z (IOP Publishing, 2021-10-01)
    Double-peaked emission-line AGN (DPAGN) have been regarded as binary black hole candidates. We present here results from parsec-scale radio observations with the Very Long Baseline Array (VLBA) of five DPAGN belonging to ...
  • Intermediate luminosity type Iax supernova 2019muj with narrow absorption lines: long-lasting radiation associated with a possible bound remnant predicted by the weak deflagration model 
    Kawabata, Miho; Maeda, Keiichi; Yamanaka, Masayuki; Nakaoka, Tatsuya; Kawabata, Koji S; Aoki, Kentaro; Anupama, G. C; Burgaz, Umut; Anirban Dutta; Isogai, Keisuke; Kino, Masaru; Kojiguchi, Naoto; Kota, Iida; Brajesh Kumar; Kuroda, Daisuke; Maehara, Hiroyuki; Matsubayash, Kazuya; Morihana, Kumiko; Murata, Katsuhiro L; Ohshima, Tomohito; Otsuka, Masaaki; Sahu, D. K; Avinash Singh; Sugitani, Koji; Takahashi, Jun; Takagi, Kengo (Oxford University Press on behalf of the Astronomical Society of Japan, 2021-10)
    We present comprehensive spectroscopic and photometric analyses of the intermediate luminosity type Iax supernova (SN Iax) 2019muj based on multi-band datasets observed through the framework of the OISTER target-of-opportunity ...
  • Echo mapping of active galactic nuclei 
    Amit Kumar Mandal (Indian Institute of Astrophysics, 2021-06)
    Active galactic nuclei (AGN) are the persistent high luminosity sources powered by accretion of matter onto super massive black holes (SMBHs) at their centres. They are known to show flux variation and this property can ...
  • The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study 
    Alvarez-Hernandez, A; Torre, M. A. P; Rodriguez-Gil, P; Shahbaz, T; Anupama, G. C; Gazeas, K. D; Pavana, M; Raj, A; Hakala, P; Stone, G; Gomez, S; Jonker, P. G; Ren, J.- J; Cannizzaro, G; Pastor-Marazuela, I; Goff, W; Corral-Santana, J. M; Sabo, R (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical spectroscopy and R-band photometry campaign. The radial velocity curve ...
  • Successive injection of opposite magnetic helicity: evidence for active regions without coronal mass ejections 
    Vemareddy, P (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    Magnetic helicity (MH) is a measure of twist and shear of magnetic field. MH is injected in the active region (AR) corona through photospheric footpoint motions causing twisted and sheared magnetic fields. From the ...
  • Investigation of the evolution of dark clouds 
    Sharma, Ekta (Indian Institute of Astrophysics, 2020-11)
    Stars form in the densest regions of molecular clouds which are actually gravitationally unstable cores that resides at the junction of filaments. Before the onset of the gravitational collapse in cores, the build up of ...
  • The XMM-SERVS Survey: XMM-Newton point-source catalogs for the W-CDF-S and ELAIS-S1 fields 
    Ni, Qingling; Brand, W. N; Chen, Chien-Ting; Luo, Bin; Nyland, Kristina; Yang, Guang; Zou, Fan; Aird, James; Alexander, David M; Bauer, Franz Erik; Lacy, Mark; Lehmer, Bret D; Mallick, Labani; Salvato, Mara; Schneider, Donald P; Tozzi, Paolo; Traulsen, Iris; Vaccari, Mattia; Vignali, Cristian; Vito, Fabio; Xue, Yongquan; Banerji, Manda; Chow, Kate; Comastri, Andrea; Del Moro, Agnese; Gilli, Roberto; Mullaney, James; Paolillo, Maurizio; Schwope, Axel; Shemmer, Ohad; Sun, Mouyuan; Timlin III, John D; Trump, Jonathan R (IOP Publishing, 2021-09)
    We present the X-ray point-source catalogs in two of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields, W-CDF-S (4.6 deg2) and ELAIS-S1 (3.2 deg2), aiming to fill the gap between deep pencil-beam ...
  • TRAO survey of the nearby filamentary molecular clouds, the universal nursery of stars (TRAO FUNS). II. filaments and dense cores in IC 5146 
    Chung, Eun Jung; Lee, Chang Won; Kim, Shinyoung; Maheswar, G; Tafalla, Mario; Caselli, Paola; Myers, Philip C; Liu, Tie; Yoo, Hyunju; Kim, Kyoung Hee; Kim, Mi-Ryang; Archana Soam; Cho, Jungyeon; Kwon, Woojin; Lee, Changhoon; Kan, Hyunwoo (IOP Publishing, 2021-09-20)
    We present the results on the physical properties of filaments and dense cores in IC 5146, as a part of the TRAO FUNS project. We carried out on-the-fly mapping observations using the Taeduk Radio Astronomy Observatory ...
  • Quantifying the classification of exoplanets: in search for the right habitability metric 
    Safonova, M; Mathur, Archana; Basak, Suryoday; Bora, Kakoli; Agrawal, Surbhi (Jointly published by EDP Sciences, Società Italiana di Fisica and Springer Berlin Heidelberg, 2021-09)
    What is habitability? Can we quantify it? What do we mean under the term habitable or potentially habitable planet? With estimates of the number of planets in our Galaxy alone running into billions, possibly a number greater ...
  • Habitability classification of exoplanets: a machine learning insight 
    Basak, Suryoday; Mathur, Archana; Theophilus, Abhijit Jeremiel; Deshpande, Gouri; Murthy, J (Jointly published by EDP Sciences, Springer-Verlag GmbH, 2021-09)
    We explore the efficacy of machine learning (ML) in characterizing exoplanets into different classes. The source of the data used in this work is University of Puerto Rico’s Planetary Habitability Laboratory’s Exoplanets ...
  • Fixing the chronology in Tai-Ahom chronicles by using astronomical references 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2021-11)
    The Tai-Ahom are an ethnic group, the admixed descendants of the Tai or Shan people who migrated from North Burma into the Brahmaputra Valley of Assam in India in the early decades of the thirteenth century. Their history ...
  • Tales from India: the great march comet of 1843 (C/1843 D1) 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2021-11)
    This paper discusses the observations of the Great March Comet of 1843 made from India. The observers were at various locations and the newly formed observatories participated in the astronomical observations spread over ...
  • Radio, X-ray, and extreme-ultraviolet observations of weak energy releases in the "Quiet" sun 
    Ramesh, R; Kathiravan, C; Mithun, N. P. S; Vadawale, S. V (IOP Publishing, 2021-09-01)
    We analyzed ground-based low frequency (<100 MHz) radio spectral and imaging data of the solar corona obtained with the facilities in the Gauribidanur observatory during the same time as the very weak soft X-ray flares ...
  • Kodaikanal solar observatory radio spectrograph 
    Barve, Indrajit V; Kathiravan, C; Gireesh, G. V. S; Anand, M. N; Rajesh, M; Rajalingam, M; Ebenezer, E; Ramesh, R (Springer Nature B.V., 2021-09)
    The Indian Institute of Astrophysics (IIA) has commissioned a low frequency (<100 MHz) spectrograph at its Kodaikanal Solar Observatory (KSO) for coordinated observations of transients in the solar atmosphere with other ...
  • Evaluation of fractional clear sky over potential astronomical sites 
    Shantikumar, N. S; Song, H.- J; Mugil, S. K; Dumka, U. C; Larson, E. J. L; Brijesh Kumar; Sagar, R (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    The estimation of the night-time cloud fraction (CF) is found to be one of the key parameters for evaluating the number of useful nights at an astronomical site. This work evaluates useful astronomical night-time observation ...
  • Studies of Helium-rich and Hydrogen-deficient stars to explain their origin and evolution 
    Bhowmick, A (Indian Institute of Astrophysics, 2020-12)
    The existence of hydrogen-deficient stars in a hydrogen-dominated universe in itself, sparks a considerable curiosity to explore their origin and evolution. Very rare in nature, the peculiar characteristics of these ...

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