J/other/Ser/184.19 NGC 300 candidate supernova remnants (Millar+, 2012)
A study of optical observing techniques for extra-galactic supernova remnants:
case of NGC 300.
Millar W.C., White G.L., Filipovic M.D.
<Serbian Astron. J., 184, 19-40 (2012)>
=2012SerAJ.184...19M 2012SerAJ.184...19M
ADC_Keywords: Galaxies, nearby ; Supernovae
Keywords: ISM: supernova remnants - galaxies: individual: NGC300 -
galaxies: ISM - astrometry - telescopes - techniques: miscellaneous
Abstract:
We present the results of a study of observational and identification
techniques used for surveys and spectroscopy of candidate supernova
remnants (SNRs) in the Sculptor Group galaxy NGC300. The goal of this
study was to investigate the reliability of using [Sii]:Hα≥0.4
in optical SNR surveys and spectra as an identifying feature of
extra-galactic SNRs (egSNRs), and also to investigate the
effectiveness of the observing techniques (which are hampered by
seeing conditions and telescope pointing errors) using this criterion
in egSNR surveys and spectrographs. This study is based on original
observations of these objects and archival data obtained from the
Hubble Space Telescope which contained images of some of the candidate
SNRs in NGC300. We found that the reliability of spectral techniques
may be questionable and very high-resolution images may be needed to
confirm a valid identification of some egSNRs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 45 29 Calculated pixel positions of Blair et al.
(1997ApJS..108..261B 1997ApJS..108..261B) candidate SNRs
table9.dat 72 3 *A comparison of positions of a bright star in the
image sets.
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Note on table9.dat: Because the Blair et al. (1997ApJS..108..261B 1997ApJS..108..261B) images were
calibrated to 2MASS those star coordinates are used as the standard.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [N300S-]
7- 8 I02 --- S [1/29] SNR number (<[BL97] N300-SNN> in Simbad)
10- 11 I2 h RAh BL97 Right ascension (J2000) (1)
13- 14 I2 min RAm BL97 Right ascension (J2000) (1)
16- 20 F5.2 s RAs BL97 Right ascension (J2000) (1)
22 A1 --- DE- BL97 Declination sign (J2000) (1)
23- 24 I2 deg DEd BL97 Declination (J2000) (1)
26- 27 I2 arcmin DEm BL97 Declination (J2000) (1)
29- 33 F5.2 arcsec DEs BL97 Declination (J2000) (1)
35- 37 A3 --- Image [(D-J) ] Image name
39- 41 I3 pix xpos ? X position
43- 45 I3 pix ypos ? Y position
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Note (1): Positions from Blair et al., 1997ApJS..108..261B 1997ApJS..108..261B.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 29 A29 --- Image Image set
31- 32 I2 h RAh Right ascension (J2000)
34- 35 I2 min RAm Right ascension (J2000)
37- 42 F6.3 s RAs Right ascension (J2000)
44- 49 F6.3 arcsec DRA ?=- Difference in right ascension from BL97 (1)
51 A1 --- DE- Declination sign (J2000)
52- 53 I2 deg DEd Declination (J2000)
55- 56 I2 arcmin DEm Declination (J2000)
58- 62 F5.2 arcsec DEs Declination (J2000)
64- 67 F4.2 arcsec DDE ?=- Difference in declination from BL97 (1)
69- 72 F4.2 arcsec Dist ?=- Distance from BL97 (1)
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Note (1): Blair et al., 1997ApJS..108..261B 1997ApJS..108..261B.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Dec-2012