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J/ApJ/878/44 ^13^CO clumps toward the Cassiopeia A supernova remnant (Ma+, 2019)
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Beginning of ReadMe :J/ApJ/878/44 ^13^CO clumps toward the Cassiopeia A supernova remnant (Ma+, 2019)
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A large-field J=1-0 survey of CO and its isotopologues toward the Cassiopeia A
supernova remnant.
Ma Y., Wang H., Zhang M., Li C., Yang J.
<Astrophys. J., 878, 44 (2019)>
=2019ApJ...878...44M
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ADC_Keywords: Supernova remnants; Molecular clouds; Interstellar medium;
Carbon monoxide; Surveys
Keywords: ISM: clouds; ISM: individual objects (Cas A); ISM: supernova remnants;
stars: formation; surveys
Abstract:
We have conducted a large-field simultaneous survey of ^12^CO, ^13^CO,
and C^18^O J=1-0 emission toward the Cassiopeia A (Cas A) supernova
remnant (SNR), which covers a sky area of 3.5degx3.1deg. The Cas
giant molecular cloud (GMC) mainly consists of three individual clouds
with masses on the order of 10^4^-10^5^M_sun_. The total mass
derived from the ^13^CO emission of the GMC is 2.1x10^5^M_sun_ and
is 9.5x10^5^M_sun_ from the ^12^CO emission. Two regions with
broadened (6-7km/s) or asymmetric ^12^CO line profiles are found in
the vicinity (within a 10'x10' region) of the Cas A SNR, indicating
possible interactions between the SNR and the GMC. Using the
GAUSSCLUMPS algorithm, 547 ^13^CO clumps are identified in the GMC,
54% of which are supercritical (i.e., alpha_vir_<2). The mass
spectrum of the molecular clumps follows a power-law distribution with
an exponent of -2.20. The pixel-by-pixel column density of the GMC can
be fitted with a log-normal probability distribution function (N-PDF).
The median column density of molecular hydrogen in the GMC is
1.6x10^21^cm^-2^ and half the mass of the GMC is contained in regions
with H_2_ column density lower than 3x10^21^cm^-2^, which is well
below the threshold of star formation. The distribution of the YSO
candidates in the region shows no agglomeration.
Description:
In this work, we present a large-scale (3.5degx3.1deg) survey of
molecular gas toward the Cas A supernova remnant (SNR), as part of the
Milky Way Imaging Scroll Painting (MWISP) project
(Su+ 2019ApJS..240....9S).
The observations were taken using the Purple Mountain Observatory
(PMO) 13.7m millimeter-wavelength telescope located at Delingha in
China during two observational seasons from 2015 October to 2016 April
and 2016 October to 2017 April. The ^12^CO J=1-0, ^13^CO J=1-0, and
C^18^O J=1-0 line emission data were obtained simultaneously through
the nine-beam Superconducting Spectroscopic Array Receiver mounted on
the telescope. The pointing of the telescope has an accuracy of about 5".