Detection of the atomic hydrogen (HI) absorption line and continuum emission from comet C/2020 F3 (NEOWISE) using GMRT. (arXiv:2101.05267v2 [astro-ph.EP] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Pal_S/0/1/0/all/0/1">Sabyasachi Pal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Manna_A/0/1/0/all/0/1">Arijit Manna</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kale_R/0/1/0/all/0/1">Ruta Kale</a>

Comets are the most primordial objects in our solar system which are made of
icy bodies. Comets used to release gas and dust when it moves close to the Sun.
The C/2020 F3 (NEOWISE) is a large periodic comet that is moving in a
near-parabolic orbit. The C/2020 F3 (NEOWISE) is the brightest comet in the
northern hemisphere after comet Hale-Bopp in 1997. Here we present the first
interferometric high-resolution detection of the comet C/2020 F3 (NEOWISE)
using Giant Metrewave Radio Telescope (GMRT). The observational frequency range
is 1050-1450 MHz. We also detect atomic HI absorption line at $nu$ = 1420 MHz
($sim$6$sigma$ significance) with column density $N(HI) = (1.8 pm
0.09)times 10^{20}$ cm$^{-2}$. The continuum emission from the comet in meter
wavelength arises from the large Icy Grains Halo (IGH) region. Significant
detection of C/2020 F3 in $sim$21 cm indicates the presence of large size of
particles in the coma region of the comet.

Comets are the most primordial objects in our solar system which are made of
icy bodies. Comets used to release gas and dust when it moves close to the Sun.
The C/2020 F3 (NEOWISE) is a large periodic comet that is moving in a
near-parabolic orbit. The C/2020 F3 (NEOWISE) is the brightest comet in the
northern hemisphere after comet Hale-Bopp in 1997. Here we present the first
interferometric high-resolution detection of the comet C/2020 F3 (NEOWISE)
using Giant Metrewave Radio Telescope (GMRT). The observational frequency range
is 1050-1450 MHz. We also detect atomic HI absorption line at $nu$ = 1420 MHz
($sim$6$sigma$ significance) with column density $N(HI) = (1.8 pm
0.09)times 10^{20}$ cm$^{-2}$. The continuum emission from the comet in meter
wavelength arises from the large Icy Grains Halo (IGH) region. Significant
detection of C/2020 F3 in $sim$21 cm indicates the presence of large size of
particles in the coma region of the comet.

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