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J/A+A/401/873               The SMC in the Far Infrared           (Wilke+, 2003)

The Small Magellanic Cloud in the far infrared. I. ISO's 170µm map and revisit of the IRAS 12-100µm data. Wilke K., Stickel M., Haas M., Herbstmeier U., Klaas U., Lemke D. <Astron. Astrophys. 401, 873 (2003)> =2003A&A...401..873W
ADC_Keywords: Galaxies, nearby; Galaxies, IR; Interstellar medium; H II regions Mission_Name: ISO Keywords: Galaxies: Magellanic Clouds - ISM: general - ISM: dust, extinction Abstract: The ISOPHOT experiment onboard the ISO satellite generated a complete view of the Small Magellanic Cloud (SMC) at 170µm with 1.5arcmin resolution. The map is analysed using an automated photometry program enabling accurate photometric characterization of the far infrared (FIR) emitting regions. In this paper, the sources detected at 170µm are compared with those obtainable from the IRAS satellite data. For this purpose, the 12µm, 25µm, 60µm, and 100µm IRAS high resolution (HiRes) maps of the SMC are re-examined using the same method. In contrast to former studies, this provides an all-band ISO/IRAS source catalog which is no longer based on eyeball classification, but relies on an algorithm which is capable of automated, repeatable photometry, even for irregular sources. In the mid infrared IRAS bands numerous bright FIR emitting regions in the SMC are detected and classified: 73 sources are found at 12µm, 135 at 25µm (most of them with Fν<1.0Jy). All three FIR bands at 170µm, 100µm, and 60µm reproduce the overall morphological structure of the SMC similarly well, in contrast to the 12µm and 25µm maps which only contain a limited number of extended sources and do not trace the main body of the SMC. 243 sources are detected in the ISO 170µm map, 155 of them with Fν≥2.0Jy. Comparable numbers are found for the two FIR IRAS maps at 60µm (384) and 100µm (338) with fluxes up to 450Jy. 70 of the 243 170µm sources are assigned a general SED type (cold , warm , i.e., <30K, >30K) for the first time. A comparison with earlier IRAS results suggests that many source flux densities in those studies have been under- or overestimated because of non-standardized fitting methods. Many sources with flux densities up to 40Jy listed in former catalogs cannot be identified in our data. Description: For each of the files (tablea, tableb, ... tablef), one of the five available IRAS/ISO catalogs (IRAS: 12, 25, 60, 100µm, ISO: 170µm), was taken "master catalog" and cross-correlated with all other catalogs. If the distance between a source of the master catalog and a source from one of the other catalogs ("slave catalogs") at a different wavelength was found to be less than 90" (correlation length), the two sources were considered identical. The tables contain the entry numbers of the master catalog (first column) as well as the corresponding index numbers of the remaining four slave catalogs (the four rightmost columns, ordered by decreasing wavelengths). More than one entry in an index number column indicates the presence of two or more sources within the corresponding correlation radius of 90". Source coordinates, fluxes and uncertainties have been obtained from the HIIphot program. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea.dat 194 73 The IRAS 12µm source catalog tableb.dat 205 135 The IRAS 25µm source catalog tablec.dat 177 384 The IRAS 60µm source catalog tabled.dat 165 338 The IRAS 100µm source catalog tablee.dat 166 243 The IRAS 170µm source catalog
See also: I/270 : Catalog of Positions of IR Stellar Sources (CPIRSS) (Hindsley+ 1994) I/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989) VI/101 : ISO Observation Log (ISO Team, 2001) II/181 : IR sources in Magellanic Clouds (Schwering+ 1990) Byte-by-byte Description of file: tablea.dat
Bytes Format Units Label Explanations
1- 3 I3 --- N12 Sequence number in IRAS 12µm catalog 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 12 I2 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 22 I2 arcsec DEs Declination (J2000) 24- 28 F5.1 Jy F12um Source flux density at 12µm 30- 34 F5.1 Jy e_F12um Uncertainty of the source flux density (1 sigma error) 37- 44 A8 --- N170 ? Cross identification number in `slave' catalog (170µm ISO) (G1) 46- 53 A8 --- N100 ? cross identification number in `slave' catalog (100µm IRAS) (G1) 55- 62 A8 --- N60 ? cross identification number in `slave' catalog (60µm IRAS) (G1) 64- 71 A8 --- N25 ? cross identification number in `slave' catalog (25µm IRAS) (G1) 73- 75 A3 --- Type [CWQ() ] Source classification (G2) 77- 92 A16 --- Ratio IRAS or ISO 170mum/100mum flux ratio (G3) 94- 96 A3 --- (CW) [(CW) ] Schwering & Israel, 1989, Cat. II/181 classification (G4) 98-194 A97 --- ID Other cross-identifications (G4)
Byte-by-byte Description of file: tableb.dat
Bytes Format Units Label Explanations
1- 3 I3 --- N25 Sequence number in 25µm IRAS catalog 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 12 I2 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 22 I2 arcsec DEs Declination (J2000) 24- 28 F5.1 Jy F25um Source flux density at 25µm 30- 34 F5.1 Jy e_F25um Uncertainty of the source flux density (1 sigma error) 37- 44 A8 --- N170 ? Cross identification number in `slave' catalog (170µm ISO) (G1) 46- 53 A8 --- N100 ? cross identification number in `slave' catalog (100µm IRAS) (G1) 55- 62 A8 --- N60 ? cross identification number in `slave' catalog (60µm IRAS) (G1) 64- 71 A8 --- N12 ? cross identification number in `slave' catalog (12µm IRAS) (G1) 73- 75 A3 --- Type [CWQ() ] Source classification (G2) 77- 92 A16 --- Ratio IRAS or ISO 170mum/100mum flux ratio (G3) 94- 96 A3 --- (CW) [(CW) ] Schwering & Israel, 1989, Cat. II/181 classification (G4) 98-205 A108 --- ID Other cross-identifications (G5)
Byte-by-byte Description of file: tablec.dat
Bytes Format Units Label Explanations
1- 3 I3 --- N60 Sequence number in 60µm IRAS catalog 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 12 I2 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 22 I2 arcsec DEs Declination (J2000) 24- 28 F5.1 Jy F60um Source flux density at 60µm 30- 34 F5.1 Jy e_F60um Uncertainty of the source flux density (1 sigma error) 37- 44 A8 --- N170 ? Cross identification number in `slave' catalog (170µm ISO) (G1) 46- 53 A8 --- N100 ? cross identification number in `slave' catalog (100µm IRAS) (G1) 55- 62 A8 --- N25 ? cross identification number in `slave' catalog (25µm IRAS) (G1) 64- 71 A8 --- N12 ? cross identification number in `slave' catalog (12µm IRAS) (G1) 73- 75 A3 --- Type [CWQ() ] Source classification (G2) 77- 92 A16 --- Ratio IRAS or ISO 170mum/100mum flux ratio (G3) 94- 96 A3 --- (CW) [(CW) ] Schwering & Israel, 1989, Cat. II/181 classification (G4) 98-177 A80 --- ID Other cross-identifications (G5)
Byte-by-byte Description of file: tabled.dat
Bytes Format Units Label Explanations
1- 3 I3 --- N100 Sequence number in 100µm IRAS catalog 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 12 I2 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 22 I2 arcsec DEs Declination (J2000) 24- 28 F5.1 Jy F100um Source flux density at 100µm 30- 34 F5.1 Jy e_F100um Uncertainty of the source flux density (1 sigma error) 37- 44 A8 --- N170 ? Cross identification number in `slave' catalog (170µm ISO) (G1) 46- 53 A8 --- N60 ? cross identification number in `slave' catalog (60µm IRAS) (G1) 55- 62 A8 --- N25 ? cross identification number in `slave' catalog (25µm IRAS) (G1) 64- 71 A8 --- N12 ? cross identification number in `slave' catalog (12µm IRAS) (G1) 73- 75 A3 --- Type [CWQ() ] Source classification (G2) 77- 92 A16 --- Ratio IRAS or ISO 170mum/100mum flux ratio (G3) 94- 96 A3 --- (CW) [(CW) ] Schwering & Israel, 1989, Cat. II/181 classification (G4) 98-165 A68 --- ID Other cross-identifications (G5)
Byte-by-byte Description of file: tablee.dat
Bytes Format Units Label Explanations
1- 3 I3 --- N170 Sequence number in 170µm ISO catalog 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 12 I2 s RAs Right ascension (J2000) 14 A1 --- DE- Declination sign (J2000) 15- 16 I2 deg DEd Declination (J2000) 18- 19 I2 arcmin DEm Declination (J2000) 21- 22 I2 arcsec DEs Declination (J2000) 24- 28 F5.1 Jy F170um Source flux density at 170µm 30- 34 F5.1 Jy e_F170um Uncertainty of the source flux density (1 sigma error) 37- 44 A8 --- N100 ? Cross identification number in `slave' catalog (100µm IRAS) (G1) 46- 53 A8 --- N60 ? cross identification number in `slave' catalog (60µm IRAS) (G1) 55- 62 A8 --- N25 ? cross identification number in `slave' catalog (25µm IRAS) (G1) 64- 71 A8 --- N12 ? cross identification number in `slave' catalog (12µm IRAS) (G1) 73- 75 A3 --- Type [CWQ() ] Source classification (G2) 77- 92 A16 --- Ratio IRAS or ISO 170mum/100mum flux ratio (G3) 94- 96 A3 --- (CW) [(CW) ] Schwering & Israel, 1989, Cat. II/181 classification (G4) 98-166 A69 --- ID Other cross-identifications (G5)
Global notes: Note (G1): More than one entry in an index number column indicates the presence of two sources within the corresponding correlation radius of 90". Note (G2): Classification: C: cold source when the color temperatures (assuming a modified black body with an emissivity of β=2) derived from both, the 170µm/1004mu+m and the 100µm/60µm ratios, are TBB<30K W: warm source when TBB>30K is obtained in both cases (C): denotes sources where a classification as "C" remains uncertain due to missing 60µm and/or 100µm data points. Q: questionable, when the precise shape of the SED cannot be derived due to source confusion. Note (G3): 170µm/100µm ratio: FISO(170/100) = ISO F(170µm)/F(100µm) flux ratio FIRAS(170/100) = IRAS F(170µm)/F(100µm) flux ratio Note (G4): Classification made with the source catalogs given by Schwering & Israel, 1989, Cat. II/181: (C): cold source (W): warm source Note (G5): Identifications: X(HFP2/NNN) = [HFP2000] NNN in Simbad X(SHP2/SMC30) = [SHP2000] SMC 30 in Simbad X(YIT2/NN) = [YIT2000] NN in Simbad MA93 NNNN = [MA93] NNNN in Simbad AM77 NN = [AM77] NN in Simbad BS95 NNN = [BS95] NNN in Simbad FJW97 BHHMM-DDMM = [FJW97] SMC BHHMM-DDMM in Simbad H86 NNN = [H86] NNN in Simbad
Acknowledgements: Karsten Wilke History: * Some corrections made on 20-Nov-2003: In tablec.dat: No 30, IRAS 00403-7347 modified into IRAS 00402-7347 No 86, IRAS 00466-7332 modified into IRAS 00466-7322 No 179, RXJ0055.2-7239 modified into RXJ0055.2-7238 No 267, RXJ-1-3.0-7225 modified into RXJ0103.0-7225 In tabled.dat: No 42, IRAS 00494-7216 modified into IRAS 00495-7216 No 178, IRAS 01098-7328 modified into 01098-7238
(End) Patricia Bauer [CDS] 03-Apr-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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