IIAP Publications: Recent submissions

  • Variable stars in M37 
    Dar, A. A; Parihar, P. S; Saleh, P; Malik, M. A (IOP Publishing, 2018-12)
    The CCD photometric observations of open star cluster M37 (NGC 2099) were carried out up to a limiting magnitude of V ~ 20 in both B and V filters to search for variable stars using a 2k × 4k CCD and the 1.3 m telescope ...
  • Systematics of jets using multi-wavelength data 
    Shastri, P; Gomez, E. J; Gupta, M; Madejski, G (Cambridge University Press, 2015-03)
    We investigate the systematics of the properties of highly relativistic jets at multiple frequencies, including Fermi, and MOJAVE data. We test the hypothesis that the blazar divide constitutes a dichotomy. We also explore ...
  • A road map for the generation of a near-infrared guide star catalog for thirty meter telescope observations 
    Subramanian, S; Subramaniam, A; Sivarani, T; Simard, Luc; Anupama, G. C; Gillies, Kim; Ramaprakash, A. N; Reddy, B. E (Indian Academy of Sciences, 2016-09)
    The near-infrared instruments in the upcoming Thirty Meter Telescope (TMT) will be assisted by a multi conjugate Adaptive Optics (AO) system. For the efficient operation of the AO system, during observations, a near-infrared ...
  • Forming supermassive black holes like J1342+0928 (invoking dark matter) in early universe 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2018-02)
    Recent discovery of J1342+0928 using data from the WISE telescope and ground based surveys indicate presence of a supermassive black hole (SMBH) having a mass of 800 million solar mass at a redshift of about 7.6. This imply ...
  • Measurement of coronal properties of Seyfert galaxies from NuSTAR’s hard X-ray spectrum 
    Priyanka Rani; Stalin, C. S (Indian Academy of Sciences, 2018-02)
    Precise measurement of the coronal properties of Active Galactic Nuclei (AGN) requires the availability of high signal-to-noise ratio data covering a wide range of X-ray energies. The Nuclear Spectroscopic Telescope Array ...
  • Searching for dual active galactic nuclei 
    Rubinur, K; Das, Mousumi; Kharb, P (Indian Academy of Sciences, 2018-02)
    Binary or dual active galactic nuclei (DAGN) are expected from galaxy formation theories. However, confirmed DAGN are rare and finding these systems has proved to be challenging. Recent systematic searches for DAGN using ...
  • M∙ − σ relation in spherical systems 
    Bhattacharyya, D; Mangalam, A (Indian Academy of Sciences, 2018-02)
    To investigate the M∙−σ relation, we consider realistic elliptical galaxy profiles that are taken to follow a single power-law density profile given by Ï (r)=Ï 0(r/r0)−γ or the Nuker intensity profile. We calculate ...
  • Revisiting the ‘cis-effect’ in 1,2-difluoro derivatives of ethylene and diazene using ab initio multireference methods 
    Banerjee, Debi; Ghosh, Anirban; Chattopadhyay, Sudip; Ghosh, Pradipta; Chaudhuri, R. K (Taylor & Francis, 2014-12)
    The relative stabilities of cis- and trans- isomers of 1,2-difluoroethylene and 1,2 difluorodiazene have been studied via the state-specific multireference coupled cluster (SS-MRCC) method and its perturbative counterpart ...
  • SN 2015as: a low-luminosity Type IIb supernova without an early light-curve peak 
    Gangopadhyay, A; Misra, K; Pastorello, A; Sahu, D. K; Tomasella, L; Tartaglia, L; Singh, M; Dastidar, R; Srivastav, S; Ochner, P; Brown, P. J; Anupama, G. C; Benetti, S; Cappellaro, E; Brajesh Kumar; Kumar, B; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    We present results of the photometric (from 3 to 509 days past explosion) and spectroscopic (up to 230 days past explosion) monitoring campaign of the He-rich Type IIb supernova (SN) 2015as. The (B-V) colour evolution of ...
  • A Raspberry Pi-based attitude sensor 
    Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar; Mohan, Rekhesh; Akshata Nayak; Safonova, M; Murthy, J (World Scientific Publishing Co., 2014-11)
    We have developed a lightweight low-cost attitude sensor, based on a Raspberry Pi, built with readily available commercial components. It can be used in experiments where weight and power are constrained, such as in ...
  • Spectropolarimetric Observations of Solar Noise Storms at Low Frequencies 
    Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Aathira Hegde (Springer, 2018-03)
    "A new high-resolution radio spectropolarimeter instrument operating in the frequency range of 15 – 85 MHz has recently been commissioned at the Radio Astronomy Field Station of the Indian Institute of Astrophysics ...
  • A study of the H I and optical properties of Low Surface Brightness galaxies: spirals, dwarfs, and irregulars 
    Honey, M; Driel, W van; Mousumi Das; Martin, J. M (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    We present a study of the HI and optical properties of nearby (z ≤ 0.1) Low Surface Brightness galaxies (LSBGs). We started with a literature sample of ∼900 LSBGs and divided them into three morphological classes: ...
  • Arp 202: a TDG formed in a parent's extended dark matter halo? 
    Scott, T. C; Lagos, P; Ramya, S; Sengupta, C; Paudel, S; Sahu, D. K; Misra, K; Woo, J. H; Sohn, B .W (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    We report on H α + [N II] imaging of the Arp 202 interacting pair and its tidal dwarf galaxy (TDG) candidate as well as a GMOS long slit spectrum from the TDG candidate, observed with the Gemini North telescope. Our H α + ...
  • Parameterization of water vapor using high-resolution GPS data and empirical models 
    Shantikumar, S. N; Sridevi, J; Shrungeshwara, T. S (Elsevier B.V, 2018-03)
    The present work evaluates eleven existing empirical models to estimate Precipitable Water Vapor (PWV) over a high-altitude (4500 m amsl), cold-desert environment. These models are tested extensively and used globally to ...
  • Wide-field ultraviolet imager for astronomical transient studies 
    Mathew, J; Ambily, S; Prakash, A; Mayuresh, Sarpotdar; Nirmal, K; Sreejith, A. G; Safonova, M; Murthy, J; Brosch, N (Springer, 2018-04)
    Though the ultraviolet (UV) domain plays a vital role in the studies of astronomical transient events, the UV time-domain sky remains largely unexplored. We have designed a wide-field UV imager that can be flown on a range ...
  • TIRSPEC: TIFR Near Infrared Spectrometer and Imager 
    Ninan, J. P; Ojha, D. K; Ghosh, S. K; D'Costa, S. L. A; Naik, M. B; Poojary, S. S; Sandimani, P. R; Meshram, G. S; Jadhav, R. B; Bhagat, S. B; Gharat, S. M; Bakalkar, C. B; Prabhu, T. P; Anupama, G. C; Toomey, D. W (World Scientific Publishing Co., 2014-12)
    We describe the TIFR Near Infrared Spectrometer and Imager (TIRSPEC) designed and built in collaboration with M/s. Mauna Kea Infrared LLC, Hawaii, USA, now in operation on the side port of the 2-m Himalayan Chandra Telescope ...
  • The First Low-frequency Radio Observations of the Solar Corona on ≈200 km Long Interferometer Baseline 
    Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Anshu Kumari; Hariharan, K; Barve, Indrajit V (IOP Publishing, 2018-03-01)
    The angular size of the smallest, compact radio source that can be observed in the solar atmosphere is one of the intriguing questions in low-frequency radio astronomy. This is important to understand density turbulence ...
  • Photometric metallicity map of the Small Magellanic Cloud 
    Choudhury, S; Subramaniam, A; Cole, A. A; Sohn, Y. J (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We have created an estimated metallicity map of the Small Magellanic Cloud (SMC) using the Magellanic Cloud Photometric Survey (MCPS) and Optical Gravitational Lensing Experiment (OGLE III) photometric data. This is a first ...
  • Broad-line Type Ic supernova SN 2014ad 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K; Srivastav, S; Tanaka, M; Maeda, K; Nomoto, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We present optical and ultraviolet photometry and low-resolution optical spectroscopy of the broad-line Type Ic supernova SN 2014ad in the galaxy PGC 37625 (Mrk 1309), covering the evolution of the supernova during −5 to ...
  • The Curious Case of PDS 11: A Nearby, >10 Myr Old, Classical T Tauri Binary System 
    Mathew, B; Manoj, P; Bhatt, B. C; Sahu, D. K; Maheswar, G; Muneer, S (IOP Publishing, 2017-05)
    We present results of our study of the PDS 11 binary system, which belongs to a rare class of isolated, high Galactic latitude T Tauri stars. Our spectroscopic analysis reveals that PDS 11 is an M2–M2 binary system with ...

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