J/A+A/624/A43 Galactic HI supershells kinetic energies (Suad+, 2019)
Galactic HI supershells: kinetic energies and possible origin.
Suad L.A., Caiafa C.F., Cichowolski S., Arnal E.M.
<Astron. Astrophys. 624, A43 (2019)>
=2019A&A...624A..43S 2019A&A...624A..43S (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium; H I data ; Milky Way
Keywords: ISM: structure - methods: data analysis -
techniques: image processing - radio lines: ISM
Abstract:
We estimate the Galactic supershell (GS) masses and energies. We
developed and used an automatic algorithm. The study was carried out
making use of the Leiden-Argentine-Bonn (LAB) HI survey in the outer
part of the Galaxy. The algorithm was applied only to a set of GSs
from the catalogue of Suad et al. (2014, Cat. J/A+A/564/A116), those
showing HI-emission surrounding its central cavity in at least three
quarters (or 270 degrees) of its angular extent. A total of 490 GSs
fulfilled this criterion. Among them, 308 are completely surrounded by
walls of HI-emission (Group A) and in the remaining 182 the central HI
minimum is surrounded by ridges of HI emission in at least 270° of
its angular extent (Group B).
Description:
Tables 3 and 4 contain the parameters of GS belonging to Groups A
and B, respectively. Names of the structures (Col. 1) are created
from galactic coordinates and the radial velocity of their centres.
The asterisk at the end of some of the structures (Table 4) indicates
that this structure is a galactic chimney candidate. Columns 2-3
describe the galactic longitude and latitude of the center of the
fitted ellipse. The uncertainty in the values estimated for the
centroid of the ellipses is about ±0.2°. Column 4 the
systemic radial velocity. The uncertainty of this velocity is equal to
the velocity resolution of the data (1.3km/s). In col. 5 is given the
heliocentric distance. In Col. 6 is listed the effective radius of the
structures. The uncertainties in these values come from the
uncertainties in the distances and angular semi-axes, and are around
16%. In Col. 7 are the expansion velocities. In Col. 8 are listed the
GS HI masses and in Col. 9 the GS kinetic energies. The uncertainties
in the masses end energies are about 50% and 64%, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 77 308 Galactic supershells (Group A)
table4.dat 79 182 Galactic supershells (Group B)
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See also:
J/A+A/564/A116 : HI supershells catalogue (Suad+, 2014)
Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [GS]
3- 12 A10 --- Name Name of the shell (lll+bb+vvv)
13 A1 --- n_Name [*] * indicates that this structure is a
galactic chimney candidate
17- 21 F5.1 deg GLONe Galactic longitude of the center of the ellipse
25- 29 F5.1 deg GLATe Galactic latitude of the center of the ellipse
33- 38 F6.1 km/s v0 Systemic velocity of the supershell
41- 44 F4.1 kpc d Heliocentric distance of the supershell
49- 52 I4 pc Reff Effective radius of the supershell
57- 61 F5.2 km/s vex Expansion velocity of the supershell
64- 69 F6.2 10+4Msun MHIshell Supershell HI mass
73- 79 F7.4 10+43J EK Supershell kinetic energy (in 10+50erg unit)
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Acknowledgements:
Laura Andrea Suad, lsuad(at)iafe.uba.ar
(End) Laura Andrea Suad [IAFE-Argentina], Patricia Vannier [CDS] 15-Feb-2019