J/A+A/368/267 Spatially resolved spectroscopy of Cas A (Maccarone+, 2001)
Spatially resolved spectroscopy of Cassiopeia A with MECS on board Beppo-SAX.
Maccarone M.C., Mineo T., Preite-Martinez A.
<Astron. Astrophys. 368, 267 (2001)>
=2001A&A...368..267M 2001A&A...368..267M
ADC_Keywords: Supernova remnants ; X-ray sources ; Abundances
Keywords: ISM: SuperNova remnants - X-rays: ISM - methods: data analysis -
techniques: image processing, spectroscopic - IMS: individual: Cas A
Abstract:
We have performed the first detailed spatially resolved spectroscopy
of Cas A in the 1.6-10keV energy range, using data taken with the
Medium Energy Concentrator Spectrometer (MECS) on board the BeppoSAX
Observatory. The well calibrated point spread function in the central
region of the MECS allowed us to perform a spatial deconvolution of
the data at full energy resolution. We eventually generated a set of
spectra, covering a region of ∼3' radius around the centre of Cas A.
The data used were obtained on Aug 1996, Sep 1996 and Nov 1997.
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
table4.dat 126 187 Results obtained fitting the 182 spectra with
a non-equilibrium ionisation plasma model
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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: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 pix Xpos X position (1pix = 8arcsec)
5- 7 I3 pix Ypos Y position (1pix = 8arcsec)
9- 12 F4.2 10+22cm-2 NH ? Hydrogen column density (1)
13 A1 --- u_NH Uncertainty flag on NH
15- 18 F4.2 10+22cm-2 e_NH ? rms uncertainty on NH
21- 24 F4.2 keV kT ? Energy parameter, kT (1)
25 A1 --- u_kT [:] Large uncertainty on kT
27- 30 F4.2 keV e_kT ? rms uncertainty on kT
32- 36 F5.2 [s/cm3] log(net) ? Ionisation parameter, log(net) (1)
37 A1 --- u_log(net) [:] Large uncertainty on log(net)
39- 42 F4.2 [s/cm3] e_log(net) ? rms uncertainty on log(net)
44- 48 F5.2 Sun Si ? Si abundance ratio with respect to
reference values (1) (2)
49 A1 --- u_Si [:] Large uncertainty on Si
51- 55 F5.2 Sun e_Si ? rms uncertainty on Si
57- 61 F5.2 Sun S ? S abundance ratio with respect to
reference values (1) (2)
62 A1 --- u_S [:] Large uncertainty on S
64- 67 F4.2 Sun e_S ? rms uncertainty on S
69- 73 F5.2 Sun Ar ? Ar abundance ratio with respect to
reference values (1) (2)
74 A1 --- u_Ar [:] Large uncertainty on Ar
76- 80 F5.2 Sun e_Ar ? rms uncertainty on Ar
82- 86 F5.2 Sun Ca ? Ca abundance ratio with respect to
reference values (1) (2)
87 A1 --- u_Ca [:] Large uncertainty on Ca
89- 92 F4.2 Sun e_Ca ? rms uncertainty on Ca
94- 98 F5.2 Sun Fe ? Fe abundance ratio with respect to
reference values (1) (2)
99 A1 --- u_Fe [:] Large uncertainty on Fe
101-104 F4.2 Sun e_Fe ? rms uncertainty on Fe
106-110 F5.2 Sun Ni ? Ni abundance ratio with respect to
reference values (1) (2)
111 A1 --- u_Ni [:] Large uncertainty on Ni
113-117 F5.2 Sun e_Ni ? rms uncertainty on Ni
119-122 F4.2 --- chi2 chi2 value of the model
124-126 I3 --- DOF Degree of freedom of the model
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Note (1): A dash replaces values that was impossible to constrain to a
statistically significant level.
Note (2): Reference values (solar abundance by number) used in the
fitting model are (H=1):
Si = 3.77*10-5, S =1.94*10-5, Ar=3.45*10-6,
Ca = 2.30*10-6, Fe=3.38*10-5, Ni=1.86*10-6.
Quoted errors are one standard deviation.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 24-Jan-2003