J/A+A/627/A75 VRO 42.05.01 CO datacubes (Arias+, 2019)
The environment of supernova remnant VRO 42.05.01 as probed with IRAM 30m
molecular line observations.
Arias M., Domcek V., Zhou P., Vink J.
<Astron. Astrophys. 627, A75 (2019)>
=2019A&A...627A..75A 2019A&A...627A..75A (SIMBAD/NED BibCode)
ADC_Keywords: Supernova remnants ; Carbon monoxide
Keywords: ISM: supernova remnants - ISM: clouds - ISM: molecules - ISM: general
Abstract:
The environment of supernova remnants (SNRs) is a key factor in their
evolution, particularly at later stages of their existence.
Mixed-morphology (MM) SNRs have a peculiar centre-filled X-ray shape
that remains enigmatic. It is often assumed that they evolve in very
dense environments, and that the X-ray morphology is due to
interactions between the SNRs and their surroundings.
We aim to determine whether VRO 42.05.01 is embedded in, and
interacting with, a dense molecular environment. We also aim to
understand the multi-wavelength emission from the environment of this
SNR, and whether the interstellar material can be responsible for the
the MM nature of the source, and for its strange radio and optical
shape.
We used the IRAM telescope in Pico Veleta, Spain, to search for signs
of interaction between the SNR and neighbouring molecular clouds. We
observed a region of 260 140 towards the west of VRO 42.05.01 and a
region of 80 40 towards the north of the remnant in the 12CO J=1-0,
13CO J=1-0, and 12CO J=2-1 transitions with the EMIR receiver. We
made maps of the properties of the observed molecular clouds (peak
temperatures, central velocities, velocity dispersions), as well as
maps of column density along the line of sight, and ratio of the
12CO J=2-1 to 12CO J=1-0 transitions.We also analyse archival
optical, infrared, and radio spectroscopic data for other hints on the
nature of the medium.
We do not find conclusive physical proof that the SNR is interacting
with the few, clumpy molecular clouds that surround it in the region
of our observations, although there is some suggestion of such
interaction (in a region outside our map) from infrared emission. We
find that there is a velocity gradient in one of the molecular clouds
that is consistent with a stellar wind blown by a 12-14M☉
progenitor star.We reassess the literature distance to VRO 42.05.01,
and propose that it has a local standard of rest velocity of ∼6km/s,
and that it is located 1.0±0.4kpc away (the earlier distance value
was 4.5±1.5kpc).We find that a dust sheet intersects VRO 42.05.01
and is possibly related to its double shell-shaped morphology.
Description:
We performed 3 and 1mm heterodyne observations toward the western
side of VRO 42.05.01 with the IRAM 30m telescope, over several days
in the summer and fall of 2018 (3, 4, and 5 July, and 24, 25, and 26
October) under project 045-18 (PI: Maria Arias). The observations
amounted to approximately 23 hours on-source, with varying weather and
elevation conditions, resulting in uneven noise levels in our map.
We simultaneously mapped 12CO J=1-0 (at 115.271GHz), 13CO J=1-0
(at 110.201GHz), and 12CO J=2-1 (at 230.540GHz) emission toward VRO
42.05.01 and its vicinity, in the on-the-fly mode with the Eight MIxer
Receiver (EMIR).
Objects:
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RA (2000) DE Designation(s)
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05 26 30.00 +42 56 00.0 VRO 42.05.01 = SNR G166.0+04.3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 126 3 List of datacubes
fits/* . 3 Individual datacubes
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of pixels along Z-axis
32- 37 I6 m/s bVRAD Lower value of VRAD interval
39- 43 I5 m/s BVRAD Upper value of VRAD interval
45- 47 I3 m/s dVRAD VRAD resolution
49- 53 I5 Kibyte size Size of FITS file
55- 88 A34 --- FileName Name of FITS file, in subdirectory fits
90-126 A37 --- Title Title of the FITS file
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Acknowledgements:
Maria Arias, maria.arias.de.saavedra(at)gmail.com
(End) Patricia Vannier [CDS] 20-Jun-2019