The effects of seeing on Sérsic profiles - II. The Moffat PSF

Bibcode
2001MNRAS.328..977T
DOI
10.1046/j.1365-8711.2001.04937.x
Trujillo, I.; Aguerri, J. A. L.; Cepa, J.; Gutiérrez, C. M.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 328, Issue 3, pp. 977-985.

Advertised on:
12
2001
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
4
IAC number of authors
3
Citations
151
Refereed citations
141
Description
The effects of seeing on Sérsic r1/n profile parameters are extensively studied using a Moffat function. This analytical approximation to the point spread function (PSF) is shown to provide the best fit to the PSF predicted from atmospheric turbulence theory when β~4.765. The Moffat PSF is additionally shown to contain the Gaussian PSF as a limiting case (β->∞). The Moffat function is also shown to be numerically well behaved when modelling narrow PSFs in HST images. Seeing effects are computed for elliptically symmetric surface brightness distributions. The widely used assumption of circular symmetry when studying the effects of seeing on intrinsically elliptical sources is shown to produce significant discrepancies with respect to the true effects of seeing on these sources. A prescription to correct raw (observed) central intensities, effective radii, index n and mean effective surface brightness is given.
Type
Refereed
Atmospheric effects
Methods
Galaxies
Photometry

It may interest you

  • Refereed
    Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST

    JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates are still unconfirmed and many of the best planets for atmospheric characterization may remain to be identified. We present a sample

    Hord, Benjamin J. et al.

    Advertised on:

    5
    2024
    Bibcode
    2024AJ....167..233H
    Citations
    0
  • Refereed
    High-resolution Spectroscopic Reconnaissance of a Temperate Sub-Neptune

    The study of temperate sub-Neptunes is the new frontier in exoplanetary science. A major development in the past year has been the first detection of carbon-bearing molecules in the atmosphere of a temperate sub-Neptune, K2-18 b, a possible Hycean world, with the James Webb Space Telescope (JWST). The JWST is poised to characterize the atmospheres

    Cabot, Samuel H. C. et al.

    Advertised on:

    5
    2024
    Bibcode
    2024ApJ...966L..10C
    Citations
    0
  • Refereed
    Nonlinear Wave Damping by Kelvin–Helmholtz Instability-induced Turbulence

    Magnetohydrodynamic kink waves naturally form as a consequence of perturbations to a structured medium, for example, transverse oscillations of coronal loops. Linear theory has provided many insights into the evolution of linear oscillations, and results from these models are often applied to infer information about the solar corona from observed

    Hillier, Andrew et al.

    Advertised on:

    5
    2024
    Bibcode
    2024ApJ...966...68H
    Citations
    0