2022RNAAS...6..205S

Query : 2022RNAAS...6..205S

2022RNAAS...6..205S - Research Notes of the AAS, 6, 205 (2022/October-0)

On the Measurement of Vorticity in Astrophysical Fluids.

SPANGLER S.R.

Abstract (from CDS):

Vorticity is central to the nature of, and dynamical processes in turbulence, including turbulence in astrophysical fluids. The results of Raymond et al. on vorticity in the post-shock fluid of the Cygnus Loop supernova remnant are therefore of great interest. I consider the degree to which spectroscopic measurements of an optically thin line, the most common type of astronomical velocimetry, can yield unambiguous measurements of the vorticity in a fluid. I consider an ideal case of observations in the plane of a flow which possesses vorticity in a direction perpendicular to the plane of observations. The observationally deduced vorticity (referred to as the pseudovorticity) is a reasonable match for the true vorticity. However, the pseudovorticity of an irrotational model flow is also nonzero, and comparable in magnitude to that for a vortical flow. Astronomical spectroscopic observations may yield a good estimate of the vorticity, but its robustness cannot be insured.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interstellar medium - Interplanetary turbulence - Plasma astrophysics

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 964 0

Query : 2022RNAAS...6..205S

Basic data :
NAME Cyg Loop -- SuperNova Remnant
Other object types: otypes_help 		SNR (2009BASI,AJG,...), Rad (CTA,CTB,...), gam (1FGL,2FGL,...), X (1E,1H,...), HII (SH), UV (2RE)
ICRS coord. (ep=J2000) : 		20 51 00.0 +30 40 00 (Radio) [ ] E 2009BASI...37...45G
FK4 coord. (ep=B1950 eq=1950) : 		20 48 55.3 +30 28 43 [ ]
Gal coord. (ep=J2000) : 		073.9816 -08.5645 [ ]
Angular size (arcmin): 		230.0 160.0 ~ (Rad) D 2014BASI...42...47G
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 5 		Display criteria :

Identifiers (26) :
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NAME Cyg Loop 1FGL J2046.4+3041 NAME Cygnus Loop SNR G074.0-08.5
AJG 102 2FGL J2051.0+3040e 2RE J2057+311 4U 2046+31
CTA 93 3FGL J2051.0+3040e 2RE J205730+311130 W 78
CTB 99 4FGL J2051.0+3049e SH 2-103 X Cyg X-5
DA 528 3FHL J2051.0+3040e SNR G074.0-08.6 [DGW65] 137
DB 119 1H 2050+310 SNR G074.3-08.5
1E 2049.4+3050 1M 2051+309 SNR G072.4-09.5

References (964 between 1850 and 2026) (Total 964)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Observing logs

ISO : 12    XMM : 14   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NAME Cyg Loop

Link by name to the catalogue in VizieR :

2RE J2057+311 2RE J205730+311130

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