IIAP Publications: Recent submissions

  • Open and closed magnetic configurations of twisted flux tubes 
    Sen, Samrat; Mangalam, A (IOP Publishing, 2019-06-01)
    We construct two classes of magnetohydrostatic (MHS) equilibria for an axisymmetric vertical flux tube spanning from the photosphere to the lower part of the transition region within a realistic stratified solar atmosphere ...
  • Formation and eruption of sigmoidal satructure from a weak field region of NOAA 11942 
    Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-04-01)
    Using observations from the Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux-canceling regions of active region (AR) 11942. Through an analysis of ...
  • Modelling dust scattering in our galaxy 
    Murthy, J (Oxford University Press on behalf of the Royal Astronomical Society, 2016-06)
    I have used Monte Carlo models with multiple scattering to predict the dust scattered light from our Galaxy and have compared the predictions with data in two ultraviolet bands from the Galaxy Evolution Explorer spacecraft. ...
  • Polarimetric and photometric investigation of the dark globule LDN 1225: distance, extinction law, and magnetic fields 
    Eswaraiah, C; Lai, Shih-Ping; Ma, Yuehui; Anil K. Pandey; Jose, J; Chen, Zhiwei; Samal, M. R; Wang, Jia-Wei; Sharma, S; Ojha, D. K (IOP Publishing, 2019-04-10)
    We present results based on the optical R-band observations of the polarization of 280 stars distributed toward the dark globule LDN 1225. Parallaxes from Gaia data release 2 along with the polarization data of ~200 stars ...
  • Prospect for UV observations from the moon. III. assembly and ground calibration of lunar ultraviolet cosmic imager (LUCI) 
    Mathew, J; Nair, B. G; Safonova, M; Sriram, S; Prakash, A; Mayuresh, Sarpotdar; Ambily, S; Nirmal, K; Sreejith, A. G; Murthy, J; Kamath, P. U; Kathiravan, S; Prasad, B. R; Brosch, Noah; Kappelmann, Norbert; Gadde, Nirmal Suraj; Narayan, Rahul (Springer, 2019-03)
    The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to ...
  • Line identifications of type I supernovae: on the detection of Si II for these hydrogen-poor events 
    Parrent, J. T; Milisavljevic, D; Soderberg, A. M; Parthasarathy, M (IOP Publishing, 2016-03)
    Here we revisit line identifications of type I supernovae (SNe I) and highlight trace amounts of unburned hydrogen as an important free parameter for the composition of the progenitor. Most one-dimensional stripped-enve ...
  • India’s participation in IAU over the years 
    Mallik, D. C. V (Cambridge University Press, 2018-12)
    India was still a British colony when the International Astronomical Union was born in 1919. India did not have a national science academy nor a national research council at the time. The Royal Society, London, which was ...
  • The first GeV outburst of the radio-loud narrow-line Seyfert 1 galaxy PKS 1502+036 
    Paliya, Vaidehi S; Stalin, C. S (IOP Publishing, 2016-03)
    The γ-ray-loud narrow-line Seyfert 1 (γ-NLSy1) galaxy PKS 1502+036 (z = 0.409) exhibited its first γ-ray outburst on 2015 December 20. In the energy range of 0.1–300 GeV, the highest flux measured by the Fermi-Large Area ...
  • Neutron star physics in the square kilometre array era: an Indian perspective 
    Konar, S; Bagchi, Manjari; Bandyopadhyay, Debades; Banik, Sarmistha; Bhattacharya, D; Bhattacharyya, S; Gangadhara, R. T; Gopakumar, A; Gupta, Y; Joshi, B. C; Maan, Yogesh; Maitra, Chandreyee; Mukherjee, D; Pai, Archana; Paul, B; Ray, A; Sutaria, F. K (Indian Academy of Sciences, 2016-12)
    It is an exceptionally opportune time for astrophysics when a number of next-generation mega-instruments are poised to observe the Universe across the entire electromagnetic spectrum with unprecedented data quality. The ...
  • Interstellar medium and star formation studies with the square kilometre array 
    Manoj, P; Vig, S; Maheswar, G; Kamath, U. S (Indian Academy of Sciences, 2016-12)
    Stars and planetary systems are formed out of molecular clouds in the interstellar medium. Although the sequence of steps involved in star formation are generally known, a comprehensive theory which describes the details ...
  • UVIT open cluster study. I. detection of a white dwarf companion to a blue straggler in M67: evidence of formation through mass transfer 
    Sindhu, N; Subramaniam, A; Jadhav, V. V; Chatterjee, Sourav; Geller, Aaron M; Knigge, Christian; Leigh, Nathan; Puzia, Thomas H; Shara, Michael; Simunovic, Mirko (IOP Publishing, 2019-09-01)
    The old open cluster M67, populated with blue straggler stars (BSSs), is a well-known test bed to study the BSS formation pathways. Here, we report the first direct detection of a white dwarf (WD) companion to a BSS in ...
  • Dark Matter Objects: Possible New Source of Gravitational Waves 
    Sivaram, C; Arun, K (Springer, 2019-10)
    Gravitational waves from mergers of black holes and neutron stars are now being detected by LIGO. Here we look at a new source of gravitational waves, i.e., a class of dark matter objects whose properties were earlier ...
  • First sub-parsec-scale mapping of magnetic fields in the vicinity of a very-low-luminosity object, L1521F-IRS 
    Archana Soam; Lee, C. W; Andersson, B.G; Maheswar, G; Juvela, Mika; Liu, Tie; Kim, Gwanjeong; Ramprasad Rao; Chung, E.J; Kwon, Woojin; Ekta, S S (IOP Publishing, 2019-09-20)
    L1521F is found to be forming multiple cores and it is cited as an example of the densest core with an embedded VeLLO in a highly dynamical environment. We present the core-scale magnetic fields (B-fields) in the near ...
  • Does black hole spin play a key role in the FSRQ/BL Lac dichotomy? 
    Bhattacharya, D; Sreekumar, P; Mukhopadhyay, B; Tomar, I (IOP Publishing, 2016-04)
    Blazars are characterized by large intensity and spectral v ariations across the electromagnetic spectrum It is believed that jets emerging from them are almo st aligned with the line-of-sight. The major- ity of ...
  • Chemical compositions and kinematics of the Hercules stream 
    Ramya, P; Reddy, B. E; Lambert, D. L; Musthafa, M. M (Oxford University Press on behalf of the Royal Astronomical Society, 2016-08)
    An abundance analysis is reported of 58-K giants identified by Famaey et al. ( 2005 , A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hippar ...
  • An upper limit on the ratio between the extreme ultraviolet and the bolometric luminosities of stars hosting habitable planets 
    Sengupta, S (Indian Academy of Sciences, 2016-07)
    An abundance analysis is reported of 58-K giants identified by Famaey et al. ( 2005 , A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hippar ...
  • Statistical study of network jets observed in the solar transition region: a comparison between coronal holes and quiet-sun regions 
    Narang, Nancy; Arbacher, R. T; Tian, H; Banerjee, D; Cranmer, S. R; DeLuca, Ed E; McKillop, S (Springer, 2014-04)
    Recent IRIS observations have revealed a prevalence of intermittent small-scale jets with apparent speeds of 80 – 250 km s−1, emanating from small-scale bright regions inside network boundaries of coronal holes. We find ...
  • Spectroscopic study of Be-shell stars : 4 Her and 88 Her 
    Bhat, S. S; Paul, K. T; Subramaniam, A; Mathew, B (IOP Publishing, 2016-06)
    We present an optical spectroscopic study based on 41 spectr a of 4 Her and 32 spectra of 88 Her, obtained over a period of 6 months. We estimate the rotationa l velocity of these stars from He I lines in the blue ...
  • A GMRT study of Seyfert galaxies NGC 4235 and NGC 4594: evidence of episodic activity? 
    Kharb, P; Srivastava, S; Singh, V; Gallimore, J. F; Ishwara-Chandra, C. H; Ananda, H (Oxford University Press on behalf of the Royal Astronomical Society, 2016-06)
    Low-frequency observations at 325 and 610 MHz have been carried out for two ‘radio-loud’ Seyfert galaxies, NGC 4235 and NGC 4594 (Sombrero galaxy), using the Giant Meterwave Radio Telescope (GMRT). The 610 MHz total ...
  • Stochastic modeling of multiwavelength variability of the classical BL Lac Object OJ 287 on timescales ranging from decades to hours 
    Goyal, A; Stawarz, L; Zola, S; Marchenko, V; Soida, M; Nilsson, K; Ciprini, S; Baran, A; Ostrowski, M; Wiita, P. J; Gopal-Krishna; iemiginowska, A; Sobolewska, M; Jorstad, S; Marscher, A; Aller, M. F; Aller, H. D; Hovatta, T; Caton, D. B; Reichart, D; Matsumoto, K; Sadakane, K; Gazeas, K; Kidger, M; Piirola, V; Jermak, H; Alicavus, F; Baliyan, K. S; Baransky, A; Berdyugin, A; Blay, P; Boumis, P; Boyd, D; Bufan, Y; Campas Torrent, M; Campos, F; Carrillo Gomez, J; Dalessio, J; Debski, B; Dimitrov, D; Drozdz, M; Er, H; Erdem, A; Escartin Perez, A; Fallah Ramazani, V; Filippenko, A. V; Gafton, E; Garcia, F; Godunova, V; Gomez Pinilla, F; Maheswar, G; Haislip, J. B; Haque, S; Harmanen, J; Hudec, R; Hurst, G; Ivarsen, K. M; Joshi, A; Kagitani, M; Karaman, N; Karjalainen, R; Kaur, N; Koziel-Wierzbowska, D; Kuligowska, E; Kundera, T; Kurowski, S; Kvammen, A; LaCluyze, A. P; Lee, B. C; Liakos, A; Lozano de Haro, J; Moore, J. P; Mugrauer, M; Naves Nogues, R; Neely, A. W; Ogloza, W; Okano, S; Pajdosz, U; Pandey, J. C; Perri, M; Poyner, G; Provencal, J; Pursimo, T; Raj, A; and 29 co-authors (IOP Publishing, 2018-08-20)
    We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the Fermi-LAT survey at high-energy γ-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite ...

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