Upgraded GMRT observations of the Coma cluster of galaxies: The observations. (arXiv:2009.07145v1 [astro-ph.GA])

Upgraded GMRT observations of the Coma cluster of galaxies: The observations. (arXiv:2009.07145v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lal_D/0/1/0/all/0/1">Dharam V. Lal</a>

We have used the upgraded Giant Metrewave Radio Telescope to map the Coma
cluster of galaxies at 250-500 MHz and 1050-1450 MHz bands. These 6.26 arcsec
and 2.18 arcsec resolutions observations allow detailed radio structures to be
determined of all detected radio sources that show both discrete pointlike and
extended morphologies. We present images of a subset of 32 brightest (flux
density >= 30 mJy) and dominant sources, and several sources show discrete
pointlike radio morphologies. We find the steepening of the spectra consistent
with synchrotron cooling in the majority of sources and the median for spectral
indices is -0.78, suggesting that ~59% sources have steep spectra. The nature
and the statistical properties of the radio sources in the Coma cluster will be
discussed in subsequent papers.

We have used the upgraded Giant Metrewave Radio Telescope to map the Coma
cluster of galaxies at 250-500 MHz and 1050-1450 MHz bands. These 6.26 arcsec
and 2.18 arcsec resolutions observations allow detailed radio structures to be
determined of all detected radio sources that show both discrete pointlike and
extended morphologies. We present images of a subset of 32 brightest (flux
density >= 30 mJy) and dominant sources, and several sources show discrete
pointlike radio morphologies. We find the steepening of the spectra consistent
with synchrotron cooling in the majority of sources and the median for spectral
indices is -0.78, suggesting that ~59% sources have steep spectra. The nature
and the statistical properties of the radio sources in the Coma cluster will be
discussed in subsequent papers.

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