J/A+AS/114/215 New SNR candidates in M31 (Magnier+, 1995) ================================================================================ 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. =1995A&AS..114..215M (SIMBAD/NED BibCode) ================================================================================ 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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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] -------------------------------------------------------------------------------- Note (1): b: images not used in analysis -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 table4 table5 table6 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table7 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- ================================================================================ (End) Simona Mei [CDS] 28-Sep-1995