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Browsing by Subject "Methods: statistical"

Browsing by Subject "Methods: statistical"

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  • Difference image analysis: extension to a spatially varying photometric scale factor and other considerations 
    Bramich, D. M; Horne, Keith; Albrow, M. D; Tsapras, Y; Snodgrass, C; Street, R. A; Hundertmark, M; Kains, N; Arellano Ferro, A; Figuera Jaimes, R; Giridhar, S (Oxford University Press on behalf of the Royal Astronomical Society, 2013-01-21)
    We present a general framework for matching the point-spread function (PSF), photometric scaling and sky background between two images, a subject which is commonly referred to as difference image analysis (DIA). We introduce ...
  • An empirical relation to estimate host galaxy stellar light from AGN spectra 
    Jalan, Priyanka; Rakshit, Suvendu; Woo, Jong-Jak; Kotilainen, Jari; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-05)
    Measurement of black hole mass for low-z (z≤ 0.8) Active Galactic Nuclei (AGNs) is difficult due to the strong contribution from host galaxy stellar light necessitating detailed spectral decomposition to estimate the AGN ...
  • Improved characterization of intranight optical variability of prominent AGN classes 
    Goyal, A; Gopal-Krishna; Wiita, P. J; Stalin, C. S; Sagar, R (Oxford University Press on behalf of the Royal Astronomical Society, 2013-10-21)
    The incidence of intranight optical variability (INOV) is known to differ significantly among different classes of powerful active galactic nuclei (AGN). A number of statistical methods have been employed in the literature ...
  • Minkowski Tensors in Two Dimensions: Probing the Morphology and Isotropy of the Matter and Galaxy Density Fields 
    Appleby, S; Pravabati, C; Park, C; Hong, S. E; Kim, J; Vidhya, G (IOP Publishing, 2018-05-10)
    We apply the Minkowski tensor statistics to two-dimensional slices of the three-dimensional matter density field. The Minkowski tensors are a set of functions that are sensitive to directionally dependent signals in the ...
  • Multi-band Observations of Gamma Ray Bursts 
    Bhargavi, S. G (Indian Academy of Sciences, 2002-06)
    This talk focuses on the various aspects we learnt from multiband observations of GRBs both, before and during the afterglow era. A statistical analysis to estimate the probable redshifts of host galaxies using the luminosity ...
  • Postulating exoplanetary habitability via a novel anomaly detection method 
    Sarkar, Jyotirmoy; Bhatia, Kartik; Saha, Snehanshu; Safonova, M; Sarkar, Santonu (Oxford University Press on behalf of Royal Astronomical Society, 2022-03)
    A profound shift in the study of cosmology came with the discovery of thousands of exoplanets and the possibility of the existence of billions of them in our Galaxy. The biggest goal in these searches is whether there are ...
  • A statistical study of plasmoids associated with a post-CME current sheet 
    Ritesh Patel; Pant, Vaibhav; Chandrashekhar, K; Banerjee, D (EDP Sciences, 2020-12)
    Context. Coronal mass ejections (CMEs) are often observed to be accompanied by flare, current sheets, and plasmoids/plasma blobs. 2D and 3D numerical simulations and observations reported plasmoids moving upward as well ...
  • X-ray variability and the inner region in active galactic nuclei 
    Mohan, Prashanth; Mangalam, A (IOP Publishing, 2014-08-20)
    We present theoretical models of X-ray variability attributable to orbital signatures from an accretion disk including emission region size, quasi-periodic oscillations (QPOs), and its quality factor Q, and the emergence ...
  • β-SGP: Scaled Gradient Projection with β-divergence for astronomical image restoration 
    Gondhalekar, Y; Safonova, M; Saha, S (Elsevier B.V., 2023-07)
    Image restoration in astronomy has been considered a vital step in many ground-based observational programs that often suffer from sub-optimal seeing due to atmospheric turbulence, distortion of stellar shapes due to ...

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