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J/A+AS/114/215 New SNR candidates in M31 (Magnier+, 1995)
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New supernova remnant candidates in M31
Magnier E.A., Prins S., van Paradijs J., Lewin W.H.G., Supper R.,
Hasinger G., Pietsch W., Truemper J.
<Astron. Astrophys. Suppl. Ser. 114, 215 (1995)>
=1995A&AS..114..215M (SIMBAD/NED BibCode)
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ADC_Keywords: Supernova remnants ; H II regions
Keywords: galaxies: M31, ISM - ISM: supernova remnants, HII regions, bubbles
Description:
We have performed a CCD H{alpha}, [SII], V survey of ~1.0 square
degree of the disk of M 31 to search for new supernova remnant (SNR)
candidates. We have identified candidates based on a combination of
criteria: optical line-flux ratios, the presence or absence of
ionizing blue stars, and optical morphology. We have identified a
total of 178 candidate SNRs, divided into three confidence categories:
13 with the highest confidence, 54 with moderate confidence, and 111
with the lowest confidence. We have also identified 14 large
structures with the characteristics of the superbubbles seen in the
Galaxy and Magellanic Clouds. Of our 178 candidates, 15 have been
identified in previous searches (Braun & Walterbos 1993; Blair et al.
1981; D'Odorico et al. 1980). We present finding charts of all
candidate SNRs and the superbubbles we have noted. We also present a
detailed discussion of SNR searches in the Local Group.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 40 17 Image parameters
table2 92 19 O and early B stars and their Stroemgren spheres
table3 91 14 The superbubbles
table4 103 13 Our highest-confidence SNR candidates
table5 128 54 Our middle-confidence SNR candidates
table6 136 111 Our lowest-confidence SNR candidates
table7 89 55 SNR candidates from other authors not
identified in our images
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 2 I2 --- Field Field number
3 A1 --- n_Field [b] Note on field (1)
5- 11 F7.4 deg RAd Right ascension (J2000.0)
13- 19 F7.4 deg DEd Declination (J2000.0)
21- 24 I4 s ExpHa Exposure time in H{alpha}
26- 29 I4 s ExpSII Exposure time in [SII]
31- 32 I2 s ExpV Exposure time in V
34- 36 F3.1 10-16mW/m2/pix NoiseHa ? Noise/pixel in H{alpha}
38- 40 F3.1 10-16mW/m2/pix NoiseSII ? Noise/pixel in [SII]
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Note (1): b: images not used in analysis
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 8 A8 --- Sp Spectral type
10- 13 F4.1 mag MVmag Absolute V magnitude
15- 18 F4.1 mag Vmag Apparent V magnitude
20- 24 F5.2 mag B-V B-V colour index
26- 30 F5.2 s-1 logN(Lyc) Production rate of Lyman continuum photons
32- 36 F5.2 10-7W logL(Ha) Expected H{alpha} luminosity at the distance
of M 31
38- 43 F6.2 mW/m2 logF(Ha) Expected H{alpha} flux at the distance of M 31
45- 50 F6.3 pc/cm2 U Excitation parameter for such photon rate
52- 57 F6.3 pc Rad Stroemgren sphere radii for a
ISM density n_H_=1cm^-3^
59- 64 F6.3 cm-2 log(NH) Hydrogen column density for n_H_=1cm^-3^
66- 70 F5.3 mag AV Expected optical extinction for n_H_=1cm^-3^
72- 76 F5.3 pc Rad100 Stroemgren sphere radii for a
ISM density n_H_=100cm^-3^
78- 83 F6.3 cm-2 log(NH)100 Hydrogen column density for n_H_=100cm^-3^
85- 89 F5.3 mag AV100 Expected optical extinction for n_H_=100cm^-3^
91 A1 --- Note1 [*] * for HII regions detectable in our images
(bold lines in printed table)
92 A1 --- Note2 [c] c for stars included in the completness
limit of our blue star list
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Byte-by-byte Description of file: table3 table4 table5 table6
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Bytes Format Units Label Explanations
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2- 6 A5 --- ID Identification number
8- 14 F7.4 deg RAdeg Right ascension (J2000)
16- 22 F7.4 deg DEdeg Declination (J2000)
24- 28 F5.1 arcsec DeltaRA Approximate extent of the object in
right ascension
30- 34 F5.1 arcsec DeltaDE Approximate extent of the object in
declination
36- 39 F4.1 arcsec Diam ? Diameter of the object
40 A1 --- n_Diam When '*' extrapolated diameter
45- 49 A5 --- Pict Picture number
51- 52 A2 --- Fig Figure number (5a through 5m)
54- 55 I2 --- Field Field number in which the candidate was
identified
57-137 A81 --- Comments Comments
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Byte-by-byte Description of file: table7
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Bytes Format Units Label Explanations
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2- 7 A6 --- ID SNR Identification
9- 15 F7.4 deg RAdeg Right ascension (J2000)
17- 23 F7.4 deg DEdeg Declination (J2000)
25- 89 A65 --- Comments Comments
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References:
Blair et al. 1981, ApJ 247, 879 =1981ApJ...247..879B
Braun R. and Walterbos R. 1993, A&AS 98, 327 =1993A&AS...98..327B
D'Odorico S. et al. 1980, A&AS 40, 67 =1980A&AS...40...67D
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(End) Simona Mei [CDS] 28-Sep-1995