IIA Institutional Repository: Recent submissions

  • Extragalactic survey using GALEX–spitzer matching fields 
    Bose, L. S; Sujatha, N. V; Narayanankutty, K; Murthy, J (Pleiades Publishing, 2015-12)
    We have used Spitzer observations of galaxies in the ELAIS-N1 region centered at 16h10m01s, +54◦30′36″ to extend the effective sensitivity of GALEX UV observations of the same region. Spitzer is more sensitive to external ...
  • Observational Signature of Circumstellar Interaction and 56Ni-mixing in the Type II Supernova 2016gfy 
    Singh, A; Brajesh Kumar; Moriya, Takashi J; Anupama, G. C; Sahu, D. K; Brown, Peter J; Andrews, Jennifer E; Smith, Nathan (IOP Publishing, 2019-09-01)
    The optical and ultraviolet broadband photometric and spectroscopic observations of the Type II supernova (SN) 2016gfy are presented. The V-band light curve (LC) shows a distinct plateau phase with a slope of s2 ∼ 0.12 mag ...
  • Dissecting galaxies: spatial and spectral separation of emission excited by star formation and AGN activity 
    Davies, R. L; Groves, B; Kewley, L; Dopita, M. A; Hampton, E. J; Shastri, P; Scharwachter, J; Sutherland, R; Kharb, P; Bhatt, H. C; Jin, C; Banfield, J; Zaw, I; James, B; Juneau, S; Srivastava, S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-10-21)
    The optical spectra of Seyfert galaxies are often dominated by emission lines excited by both star formation and active galactic nucleus (AGN) activity. Standard calibrations (such as for the star formation rate) are not ...
  • SPIRITS: Uncovering Unusual Infrared Transients with Spitzer 
    Kasliwal, M. M; Bally, J; Masci, F; Cody, Ann Marie; Bond, H. E; Jencson, Jacob E; Tinyanont, S; Cao, Y; Contreras, C; Dykhoff, Devin A; Amodeo, Samuel; Armus, L; Boyer, Martha; Cantiello, Matteo; Carlon, Robert L; Cass, Alexander C; Cook, David; Corgan, David T; Faella, Joseph; Fox, O. D; Green, Wayne; Gehrz, R. D; Helou, G; Hsiao, Eric; Johansson, J; Khan, Rubab M; Lau, Ryan M; Langer, Norbert; Levesque, Emily; Milne, Peter; Mohamed, Shazrene; Morrell, N; Monson, Andy; Moore, Anna; Ofek, E. O; O' Sullivan, Donal; Parthasarathy, M; Perez, Andres; Perley, D. A; Phillips, Mark; Prince, Thomas A; Shenoy, Dinesh; Smith, Nathan; Surace, J; Van Dyk, Schuyler D; Whitelock, P. A; Williams, Robert (IOP Publishing, 2017-04-20)
    We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies ...
  • Significance of bar quenching in the global quenching of star formation 
    George, K; Subramanian, S; Paul, K. T (EDP Sciences, 2019-08)
    The suppression of star formation in the inner kiloparsec regions of barred disk galaxies due to the action of bars is known as bar quenching. We investigate here the significance of bar quenching in the global quenching ...
  • Rotating light house effect 
    Rajamohan, R; Satya Narayanan, A (Global Journals Inc., 2013-07)
    We clarify as to how a precession period appears in the analysis of periodic phenomenon in Astrophysics. The observed redshift that is related to this phenomenon is shown to be 2a/V = 2 / T, where ‘a’ is the relative ...
  • Assessment of aerosol optical and micro-physical features retrieved from direct and diffuse solar irradiance measurements from Skyradiometer at a high altitude station at Merak 
    Shantikumar, N. S; Srivastava, A. K; Bagare, S. P; Singh, R. B; Kanawade, V. P; Dorjey, N (Springer, 2015-11)
    Optical and micro-physical features of aerosol are reported using Skyradiometer (POM-01L, Prede, Japan) observations taken from a high-altitude station Merak, located in north-eastern Ladakh of the western transHimalayas ...
  • Unveiling Vela: time variability of interstellar lines in the direction of the Vela supernova remnant – II. Na D and Ca II 
    Kameswara Rao, N; Lambert, D. L; Reddy, A. B. S; Gupta, R; Muneer, S; Singh, H. P (IOP Publishing, 2017-05)
    In a survey conducted between 2011 and 2012 of interstellar Na I D line profiles in the direction of the Vela supernova remnant (SNR), a few lines of sight showed dramatic changes in low-velocity absorption components with ...
  • Extragalactic survey of UV Galaxies using GALEX 
    Bose, L. S; Narayanankutty, K; Sujatha, N. V; Murthy, J (International Organization Of Scientific Research (IOSR), 2014-05)
    We report here the results of the study of extragalactic radiation using number counts of galaxies at high galactic latitudes. For this study nine GALEX DIS targets around ELAISN1 in the North Pole. The overlapped regions ...
  • Exploring the outer emission corona spectroscopically by using Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 mission 
    Singh, J; Prasad, B. R; Venkata Suresh, Narra; Amit Kumar (Elsevier B.V, 2019-07-17)
    It is very important to make the spectrographic observations of the outer emission corona in number of emission lines simultaneously in view of the results of the observations made in [Fe x] 6374 A, [Fe xi] 7892 A, [Fe ...
  • Mid-term quasi-periodicities in the CaII-K plage index of the Sun and their implications 
    Chowdhury, P; Gokhale, M. H; Singh, J; Moon, Y.-J (Springer, 2016-02)
    We present results of the fast Fourier transform (FFT), the MEM analysis, and the wavelet analysis (WA), of the temporal variation of the monthly disk integrated “CaII-K plage-area and enhanced network (EN) area” hereafter ...
  • The broken lane of a type II radio burst caused by collision of a coronal shock with a flare current sheet 
    Gao, Guannan; Wang, Min; Wu, Ning; Lin, Jun; Ebenezer, E; Tan, Baolin (Springer, 2016-11)
    We investigated a peculiar metric type II solar radio burst with a broken lane structure that was observed on November 13, 2012. In addition to the radio data, we also studied the data in other wavelengths. The bursts were ...
  • Interference of the running waves at light bridges of a sunspot 
    Su, J. T; Ji, K. F; Banerjee, D; Cao, W. D; Priya, T. G; Zhao, J. S; Yu, S. J; Ji, H. S; Zhang, M (IOP Publishing, 2016-01-01)
    The observations of chromospheric oscillations of two umbral light bridges (LBs) within a sunspot from NOAA Active Region 12127 are presented. It was found that the running umbral waves with periods of 2.2–2.6 minutes ...
  • Constraints on dark matter scenarios from measurements of the galaxy luminosity function at high redshifts 
    Corasaniti, P. S; Agarwal, S; Marsh, D. J. E; Das, Subinoy (The American Physical Society, 2017-04-15)
    We use state-of-the-art measurements of the galaxy luminosity function (LF) at z = 6, 7, and 8 to derive constraints on warm dark matter (WDM), late-forming dark matter, and ultralight axion dark matter models alternative ...
  • Impact of photometric variability on age and mass determination in young stellar objects: the case of the Orion Nebula Cluster 
    Messina, S; Parihar, P. S; Distefano, E (IOP Publishing, 2017-06)
    Very young stars, like the Orion Nebula Cluster (ONC) members analysed in the present study, exhibit photometric variability with a wide range of amplitudes. Such a prominent variability reflects in the inferred values of ...
  • Simultaneous longitudinal and transverse oscillations in an active-region filament 
    Pant, V; Mazumder, R; Yuan, Ding; Banerjee, D; Srivastava, A. K; Shen, Yuandeng (Springer, 2016-11)
    We report on the co-existence of longitudinal and transverse oscillations in an active-region filament. On March 15, 2013, an M1.1 class flare was observed in Active Region AR 11692. A coronal mass ejection (CME) was found ...
  • Determination of the size of the dust torus in H0507+164 through optical and infrared monitoring 
    Amit Kumar; Rakshit, S; Kshama, S. K; Stalin, C. S; Mathew, B; Hoenig, Sebastian; Gandhi, Poshak; Sagar, R; Pandge, M. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    The time delay between flux variations in different wavelength bands can be used to probe the inner regions of active galactic nuclei (AGNs). Here, we present the first measurements of the time delay between optical and ...
  • Peak flux of flares associated with Coronal Mass Ejections 
    Suryanarayana, G. S; Balakrishna, K. M (IOP Publishing, 2017-01)
    Features of flares that occur in association with coronal mass ejections (CMEs) have often displayed variations compared to flares with no associated CMEs. A comparative estimation of peak flux values of flares associated ...
  • Structural analysis of star-forming blue early-type galaxies Merger-driven star formation in elliptical galaxies 
    George, K (EDP Sciences, 2017-02)
    Context. Star-forming blue early-type galaxies at low redshift can give insight to the stellar mass growth of L⋆ elliptical galaxies in the local Universe. Aims. We wish to understand the reason for star formation in ...
  • Smear correction of highly variable, frame-transfer CCD images with application to polarimetry 
    Iglesias, F. A; Feller, A; Nagaraju, K (Optical Society of America, 2015-07-01)
    Image smear, produced by the shutterless operation of frame-transfer CCD detectors, can be detrimental for many imaging applications. Existing algorithms used to numerically remove smear do not contemplate cases where ...

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