J/ApJ/613/343 Cas A knot and filament proper motions (Delaney+, 2004)
Kinematics of X-Ray-emitting components in Cassiopeia A.
Delaney T., Rudnick L., Fesen R.A., Jones T.W., Petre R., Morse J.A.
<Astrophys. J., 613, 343-348 (2004)>
=2004ApJ...613..343D 2004ApJ...613..343D
ADC_Keywords: Supernova remnants ; Proper motions ; X-ray sources
Keywords: ISM: individual (Cassiopeia A) - supernova remnants
Abstract:
We present high-resolution X-ray proper-motion measurements of
Cassiopeia A using Chandra X-Ray Observatory observations from 2000
and 2002. We separate the emission into four spectrally distinct
classes: Si-dominated, Fe-dominated, low-energy-enhanced, and
continuum-dominated. These classes also represent distinct spatial and
kinematic components.
Description:
Cas A was observed for 50ks with the ACIS-S3 chip on board Chandra on
2000 January 3031 and 2002 February 6.
Objects:
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RA (2000) DE Designation(s)
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23 23 24.0 +58 48 54 Cas A = SNR 111.7-02.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 261 Knot and filament proper motions
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See also:
J/ApJ/441/307 : Proper motions and brightness of Cas A (Anderson+ 1995)
J/ApJ/456/234 : Cas A radio knots spectral indices (Anderson+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [DRF2003] Knot or filament designation number
5- 10 F6.1 arcsec blcX X location of bottom left corner (1)
12- 17 F6.1 arcsec blcY Y location of bottom left corner (1)
19- 24 F6.1 arcsec trcX X location of top right corner (1)
26- 31 F6.1 arcsec trcY Y location of top right corner (1)
33- 37 F5.2 arcsec/yr pmRA Right Ascension proper motion (2)
39- 43 F5.2 arcsec/yr pmDE Declination proper motion (2)
45- 49 F5.2 %/yr Rpm Radial component of motion
51- 54 F4.2 %/yr e_Rpm Error in Rpm
56 A1 --- Class Spectral classification (3)
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Note (1): Of box defining the region used to measure each knot or filament
and extract spectra (arcseconds of offset on epoch 2002 image with
respect to the optical expansion center at 23:23:27.77+58:48:49.4 (J2000)
(Thorstensen, Fesen & van den Bergh 2001AJ....122..297T 2001AJ....122..297T).
Note (2): All knots have been assigned a constant error of 0.07arcsec/yr.
Positive right ascension offset or motion is defined to be westward.
Note (3): Spectral classification, defined as follows:
S = Si-dominated;
F = Fe-dominated;
L = LowEnergy-enhanced;
C = continuum-dominated;
M = mixture of two or more classes.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 09-Jun-2005