منابع مشابه
Spectral Ages of CSOs and CSS Sources
This paper deals with the spectral ageing study of a representative sample of compact symmetric objects (CSOs) and compact steep spectrum (CSS) sources. Observations reveal a distinctive high-frequency steepening of the radio spectra of many of these sources. The existence of such a spectral feature is expected or may be naturally interpreted in terms of radiative ageing of synchrotron emitting...
متن کاملAstrophysical Polarimetry of Cosmological Sources
Kostelecky and Mewes have recently shown that sensitive constraints can be placed on some aspects of Lorentz symmetry violation using certain astronomical data on high-redshift sources. Here, I introduce that data in its astronomical context, making it clear that these data are robust and accurate for their purpose. In particular, I explain that spatially extended scattered light from obscured ...
متن کامل2 HI Absorption in GPS / CSS Sources
Combining our own observations with data from the literature, we consider the incidence of H I absorption in Gigahertz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources. Here we present our preliminary results, where we find that the smaller GPS sources (< 1 kpc) on average have larger H I column densities than the larger CSS sources (> 1 kpc). Both a spherical and an axi-symmetric...
متن کاملPolarisation in CSS/GPS radio sources
The polarisation properties of the intrinsically small (< 20 kpc) radio sources are briefly discussed. At centimetric and decimetric wavelengths, substantial polarised emission is often detected in quasars and, at a lower level, in radio sources identified with galaxies with projected linear sizes in excess of a few kpc. The projected linear size at which some polarised emission is detected dec...
متن کاملSymmetry Parameters of CSS Sources: Evidence of Fuelling?
The compact steep spectrum (CSS) and gigahertz peaked spectrum (GPS) sources are widely believed to be young radio sources, with ages 106 yr. If the activity in the nucleus is fuelled by the supply of gas, one might find evidence of this gas by studying the structural and polarisation characteristics of CSS sources and their evolution through this gas. In this paper we discuss some of the possi...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900176508