IIAP Publications: Recent submissions

  • Decaying turbulence and magnetic fields in galaxy clusters 
    Sur, Sharanya (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We explore the decay of turbulence and magnetic fields generated by fluctuation dynamo action in the context of galaxy clusters where such a decaying phase can occur in the aftermath of a major merger event. Using idealized ...
  • Automated Detection of Solar Radio Bursts Using a Statistical Method 
    Singh, Dayal; Sasikumar Raja, K; Subramanian, Prasad; Ramesh, R; Monstein, Christian (Springer, 2019-08)
    adio bursts from the solar corona can provide clues to forecast space-weather hazards. After recent technology advancements, regular monitoring of radio bursts has increased and large observational datasets are produced. ...
  • Multiband optical variability of 3C 279 on diverse time scales 
    Aditi Agarwal; Cellone, Sergio A; Andruchow, I; Mammana, Luis; Singh, Mridweeka; Anupama, G. C; Mihov, B; Raj, A; eva-Mihova, L; Ozdonmez, Aykut; Ege, Ergun (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We have monitored the flat spectrum radio quasar, 3C 279, in the optical B, V, R, and I passbands from 2018 February to 2018 July for 24 nights, with a total of 716 frames, to study flux, colour, and spectral variability ...
  • Are narrow-line seyfert 1 galaxies powered by low-mass black holes? 
    Viswanath, G; Stalin, C. S; Rakshit, S; Kurian, K. S; Ujjwal, K.; Gudennavar, S. B; Kartha, S. S (IOP Publishing, 2020-03)
    Are Narrow-line Seyfert 1 Galaxies Powered by Low-mass Black Holes? Gayathri Viswanath 1 , C. S. Stalin 2 , Suvendu Rakshit 3 , Kshama S. Kurian 2 , K. Ujjwal 1 , Shivappa B. Gudennavar 1 , and Sreeja S. ...
  • Binarity among objects with the Be and B[e] phenomena 
    Miroshnichenko, A. S; Zharikov, S.V; Korcakova, D; Manset, N; Mennickent, R; Khokhlov, S. A; Danford, S; Raj, A; Zakhozhay, O.V (Astronomical Institute of the Slovak Academy of Sciences, 2020-03)
    Many B-type stars exhibit two phenomena that are symbolized Be and B[e]. The former refers to presence of a circumstellar gaseous disk without significant circumstellar dust, while the latter have dust. Although neither ...
  • Hα full line spectropolarimetry as diagnostics of chromospheric magnetic field 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (Indian Academy of Sciences, 2020-12)
    Analysis of spectropolarimetric observations of two circular sunspots located close to disk centre in Hα (6562.8 Å) and Fe i (6569.22 Å) is presented in this paper. The corresponding active region numbers areNOAA 10940 and ...
  • MOND, MONG, MORG as alternatives to dark matter and dark energy, and consequences for cosmic structures 
    Sivaram, C; Arun, Kenath; Rebecca, Louise (Indian Academy of Sciences, 2020-02)
    In view of the negative results from various dark matter detection experiments, we propose alternate models by postulating a minimal field strength (minimal curvature) and also a minimal acceleration. These postulates ...
  • High-Frequency Dynamics of Active Region Moss as Observed by IRIS 
    Narang, Nancy; Pant, V; Banerjee, D; Doorsselaere, Tom Van (Frontiers, 2019-05-16)
    The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and ...
  • From the margins to the mainstream: Nobel celebrates exoplanets! 
    Puravankara, Manoj; Banyal, R. K; Narang, Mayank (Indian Physics Association, 2019-12)
    This year’s Physics Nobel Prize was jointly awarded to three scientists. Phillip James Peebles from Princeton University, USA, received one half of the prize for his seminal work on physical cosmology, and other half was ...
  • Distance, Luminosity and evolutionary status of epsilon Aurigae (F0Iaep) from Gaia DR2 parallax 
    Parthasarathy, M; Muneer, S (Konkoly Observatory, 2019-01)
    From Gaia DR2 parallax of ǫ Aurigae the distance, Mv, Mbol, and log(L∗/L⊙sun) are found to be 445 parsecs, −6.5 mag, −6.5 mag, and 4.5 respectively. These results clearly indicate that ǫ Aurigae (F0Iae) is post-AGB star. ...
  • CEESA meets machine learning: a Constant Elasticity Earth Similarity Approach to habitability and classification of exoplanets 
    Basak, S; Saha, S; Mathur, S; Bora, K; Makhija, S; Safonova, M; Agarwal, S (Elsevier B.V, 2020-01)
    We examine the existing metrics of habitability and classification schemes of extrasolar planets and provide an exposition of the use of computational intelligence techniques to estimate habitability and to automate the ...
  • New evidence for spatio-temporal fragmentation in the solar flare energy release 
    Ramesh, R; Mugundhan, V; Prabhu, K (IOP Publishing, 2020-01-20)
    We analyzed a group of type III radio bursts and a Hα flare from the Sun that were observed simultaneously on 2015 January 14. The radio observations were in the spectral mode over the frequency range 85–35 MHz, and ...
  • Insights into the evolution of symbiotic recurrent novae from radio synchrotron emission: V745 Scorpii and RS Ophiuchi 
    Kantharia, N. G; Dutta, P; Roy, N; Anupama, G. C; Ishwara-Chandra, C. H; Chitale, A; Prabhu, T. P; Banerjee, D. P. K; Ashok, N. M (Oxford University Press on behalf of the Royal Astronomical Society, 2016-02)
    We present observations at 610 and 235 MHz using the Giant Metrewave Radio Telescope (GMRT) of the recurrent nova V745 Scorpii which recorded its last outburst on 2014 February 6. This is the second symbiotic recurrent ...
  • Physical parameters of RR Lyrae stars in NGC 6171 
    Deras, D; Arellano Ferro, A; Muneer, S; Giridhar, S; Michel, R (WILEY-VCH Verlag GmbH & Co., 2018-08)
    We present an analysis of VI CCD time series photometry of the globular cluster NGC 6171. The main goal is to determine individual physical parameters for single‐mode RR Lyrae stars present in the field of view of our ...
  • Relativistic state-specific multireference perturbation theory incorporating improved virtual orbitals: application to the ground state single-bond dissociation 
    Ghosh, A; Chaudhuri, R. K; Chattopadhyay, S; Mahapatra, U. S (John Wiley & Sons, 2015-10-05)
    Using four‐component (4c) relativistic spinors, we present a computationally economical relativistic ab initio method for molecular systems employing our recently proposed second‐order state‐specific multireference ...
  • Integral field spectroscopy of the circumnuclear region of the radio galaxy Pictor A 
    Couto, G. S; Storchi-Bergmann, T; Robinson, A; Riffel, R. A; Kharb, P; Lena, D; Schnorr-Muller, A (Oxford University Press on behalf of the Royal Astronomical Society, 2016-06)
    We present optical integral field spectroscopy of the inner 2.5 × 3.4 kpc2 of the broad-line radio galaxy Pictor A, at a spatial resolution of ≈400 pc. Line emission is observed over the whole field of view, being strongest ...
  • The dust content and radiation fields of sample of galaxies in the ELAIS-N1 field 
    Shalima, P; Gogoi, R; Pathak, A; Misra, R; Gupta, R; Vaidya, D. B (The University of Chicago Press on behalf of the Astronomical Society of the Pacific, 2015-08)
    The Mid-IR colors (F8/F24) of galaxies together with their IR-UV luminosity correlations can be used to get some insight into the relative abundance of the different dust grain populations present in them. The ELAIS-N1 ...
  • Correlation between decay rate and amplitude of solar cycles as revealed from observations and dynamo theory 
    Hazra, G; Karak, B. B; Banerjee, D; Choudhuri, A. R (Springer, 2015-06)
    Using different proxies of solar activity, we have studied the following features of the solar cycle: i) The linear correlation between the amplitude of cycle and its decay rate, ii) the linear correlation between the ...
  • Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry 
    Kains, N; Bramich, D. M; Ferro, A. A; Jaimes, R. F; Jorgensen, U. G; Giridhar, S; Penny, M. T; Alsubai, K. A; Andersen, J. M; Bozza, V; Browne, P; Burgdorf, M; Novati, S. C; Damerdji, Y; Diehl, C; Dodds, P; Dominik, M; Elyiv, A; Fang, X.-S; Giannini, E; Gu, S.-H; Hardis, S; Harpsoe, K; Hinse, T. C; Hornstrup, A; Hundertmark, M; Jessen-Hansen, J; Juncher, D; Kerins, E; Kjeldsen, H; Korhonen, H; Liebig, C; Lund, M. N; Lundkvist, M; Mancini, L; Martin, R; Mathiasen, M; Rabus, M; Rahvar, S; Ricci, D; Sahu, D. K; Scarpetta, G; Skottfelt, J; Snodgrass, C; Southworth, J; Surdej, J; Tregloan-Reed, J; Vilela, C; Wertz, O; Williams, A (EDP Sciences, 2013-07)
    Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We used our data to search for variable stars in this cluster and refine the periods ...
  • Explosive and radio-selected transients: transient astronomy with square kilometre array and its precursors 
    Chandra, P; Anupama, G. C; Arun, K. G; Iyyani, S; Misra, K; Narasimha, D; Ray, A; Resmi, L; Roy, S; Sutaria, F. K (Springer, 2016-12)
    With the high sensitivity and wide-field coverage of the Square Kilometre Array (SKA), large samples of explosive transients are expected to be discovered. Radio wavelengths, especially in commensal survey mode, are ...

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