Advertisement

Spatial Distribution of Far Infrared and Radio Continuum Emission in Spiral Galaxies

  • Y. D. Mayya
  • T. N. Rengarajan
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 171)

Abstract

A study of 8 nearby spiral galaxies (NGC 2903, 3079, 3198, 3628, 4303,4321, 4656 and 6946) is carried out using the radio continuum (RC) and far infrared (FIR) images at 1′ resolution. These images are used to study the radial gradients in the ratios of FIR to RC (Q60 and Q100), warm dust temperature (Td(60/100)) etc. The main results are illustrated with NGC 2903 as an example in Fig. 1, where azimuthally averaged quantities are plotted. Td(60/100) decreases away from the center (45-25 K), increasing again by ~ 5 K in outer galaxies. Typically Q60 decreases by a factor of three away from the center in a given galaxy, but has an order of magnitude spread in the pixel values over all the galaxies. In contrast, Ql00 shows flatter gradient, which is expected from the observed temperature gradient. 20 cm RC emission profile is also shown in Fig. 1. The RC and FIR profiles can be fitted by a combination of central gaussian and exponential disk components. In general RC and FIR have about the same fraction of exponential component with the exception of NGC 3628, in which the FIR is dominated by the gaussian while the RC is mostly disk component (see Fig. 2). In 5 of the remaining 7 galaxies, the exponential component contributes > 50% of the total. In general RC scale lengths are larger than the FIR.

Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • Y. D. Mayya
    • 1
  • T. N. Rengarajan
    • 1
  1. 1.Tata Institute of Fundamental ResearchColaba, Bombay-5India

Personalised recommendations