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II/181 Atlas and Cat IR Sources in the Magellanic Clouds (Schwering+ 1990)
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Atlas and Catalogue of IR Sources in the Magellanic Clouds
Schwering P.B.W., Israel F.P.
<Kluwer Academic Publishers, Dordrecht/Boston/London (1990)>
=1990acis.book.....S
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ADC_Keywords: Infrared sources ; Magellanic Clouds ; Nebulae
Description:
The authors have used the IRAS Sky Survey and Additional Observations data
to construct an atlas of the Magellanic Clouds at wavelengths of 12, 25, 60,
and 100 microns. These are contained in the published volume only. The
position and characteristics of each infrared source identified in the maps
are included in this compilation. Also included are cross references to
sources at other wavelengths (H-alpha emission nebulae, dark clouds, and
stars) when these could be reasonably identified with the IR sources. IRAS
IDs (from the Point Source Catalog and the Small-Scale Structure Catalog)
and the IRAS Additional Observation field numbers are also given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sources.dat 122 2140 Catalog of infrared point sources in the LMC
and SMC
assoc.dat 97 993 Information about positional associations with
sources in other catalogs
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See also:
II/181 : IR sources in Magellanic Clouds (Schwering+ 1990)
Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1 A1 --- MC "S" for Small, "L" for Large Cloud
2- 5 I4 --- N Source Number
8- 9 I2 h RAh Right Ascension 1950 (hours)
11- 12 I2 min RAm Right Ascension 1950 (minutes)
14- 17 F4.1 s RAs Right Ascension 1950 (seconds)
19 A1 --- DE- Declination 1950 (sign)
20- 21 I2 deg DEd Declination 1950 (degrees)
23- 24 I2 arcmin DEm Declination 1950 (minutes)
26- 27 I2 arcsec DEs [0/60[? Declination 1950 (seconds)
29- 32 I4 10-8W/m2/sr I12 []? 12um intensity
33- 35 I3 10-8W/m2/sr B12 []? 12um background
36- 41 F6.1 10-8W/m2/sr I25 []? 25um intensity
43- 47 F5.1 10-8W/m2/sr B25 []? 25um background
49 A1 --- l_I60 [<] limit flag on I60
50- 55 F6.1 10-8W/m2/sr I60 []? 60um intensity
57- 61 F5.1 10-8W/m2/sr B60 []? 60um background
63 A1 --- l_I100 [<] limit flag on I100
64- 69 F6.1 10-8W/m2/sr I100 []? 100um intensity
71- 75 F5.1 10-8W/m2/sr B100 []? 100um background
77- 83 A7 arcmin Size *(see note)
84- 89 F6.2 Jy F12 []? 12um flux
90 A1 --- u_F12 [:] uncertainty flag on F12
92- 97 F6.2 Jy F25 []? 25um flux
98 A1 --- u_F25 [:] uncertainty flag on F25
99-104 F6.1 Jy F60 []? 60um flux
105 A1 --- u_F60 [:] uncertainty flag on F60
106-111 F6.1 Jy F100 []? 100um flux
112 A1 --- u_F100 [:] uncertainty flag on F100
114-125 A12 --- IRAS IRAS identification, followed by a note
127-131 A5 --- DPM field
133-134 A2 --- Sp *[CWS: ] Classification
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Note on Size:
The size of the source in right ascension (arcmin) x declination
(arcmin). 'p' denotes a source that cannot be discerned from a point
source response. A colon denotes an uncertain size. A dash indicates
that no reliable size could be estimated because no FWHM could be
determined. The size in these cases often agrees with a point source.
The uncertainty in the source size is inversely proportional to the
size itself, but no numberical value is derived.
Note on Sp:
A single character indicating the spectral type of the source.
Spectrum type 'C' is a 'cool dust' spectrum (typical Tdust about 30K),
peaking beyond 100um; color correction factors are of order 1.00, 0.95,
0.99, and 1.00 (for 12, 25, 60, and 100um bands). Type 'W' is a 'warm
dust' spectrum (typical Tdust about 70K), peaking between 12 and 100um;
color correction factors are of order 1.03, 1.00, 1.00, and 1.04.
Type 'S' is a 'stellar spectrum' (typical blackbody of about 5000K);
color correction factors are of order 1.43, 1.40, 1.32, and 1.09. A
colon indicates that the infrared spectrum is uncertain. Actually,
color-corrected flux densities can be calculated from the quoted ones by
dividing the latter by these color correction factors.
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Byte-by-byte Description of file: assoc.dat
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Bytes Format Units Label Explanations
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1- 97 A97 --- Assoc Record describing associations of sources in
other catalogs, with format dependent on
the catalog (1)
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Note (1):
The six tables in the printed volume (two of which have three and
five parts, respectively) that describe associations with sources in
other catalogs have been concatenated into the single file assoc.dat
here. The first byte in each record is an S or an L to indicate the cloud
(SMC or LMC) in which the source is found. This is followed by one or
more letters that indicate the type of source (see the first table
below). Since the arrangement of the data is such that a character code
is normally required to read it properly, no attempt was made to make the
data arrangement in the various parts of the table correspond. However,
the second table below lists the bytes in which each type of data is
found for each type of source.
Codes for Associations with Other Catalogs
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Code Meaning
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A Infrared emission from emission nebulae, Davies et al.
(1976)
D Infrared emission from Hodge (1972;1974) dark clouds
S Infrared emission from stars in the SAO catalog
K Infrared emission from star clusters, Kron (1956),
Lindsay (1958)
NGC Infrared emission from NGC clusters
Sk Infrared emission from planetary nebulae,
Sanduleak et al. (1978), Sanduleak and Pesch (1981)
R Infrared emission from Radcliffe stars, Feast et al.
(1960)
N Infrared emission from supernovae remnants,
Mathewson et al. (1983)
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Location of Data in Records of assoc.dat, by Source Type
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Source
Code A D S K,R,N NGC Sk
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Type 1-2 1-2 1-2 1-2 1-4 1-3
Running No. 3-8 3-7
Source No. 9-20 3-8 6-7 6-9 6-7
LI No.* 26-38 11-18 14-18 15-18 15-18
Detection** 43 26 28 28 28 28
Intensity 21-24
Remarks 50-97 34-97 36-97 36-97 36-97 36-97
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* This is the source number, SMC or LMC, in the present catalog.
** This is a single character indicating the certainty of the positional
association. '+' means good; '0' means doubtful; '-' poor or absent.
Historical Notes:
Mar-1993: In addition to the concatenation described above, File 1 was
modified in several ways. The file was reformatted to eliminate a
number of blank columns. Plus signs were added to the IRAS identification
to indicate an additional source in the printed catalog. Colons were
added to the spectral types in the SMC where they appeared in the
printed catalog.
References:
van den Bergh, S. 1981, A&AS, 46, 79.
Davies, R.D., Elliott, K.H., Meaburn, J., 1976, MN 81, 89.
"The brightest stars in the Magellanic Clouds", Feast, M. W.,
Thackeray, A. D., and Wesselink, A. J. 1960, \mnras, 121, 337
=1960MNRAS.121..337F
"Dark Nebulae in the Large Magellanic Cloud", Hodge, Paul W. 1972,
\pasp, 84, 365 =1972PASP...84..365H
"Dark Nebulae in the Small Magellanic Cloud", Hodge, Paul W. 1974,
\pasp, 86, 263 =1974PASP...86..263H
"IRAS Catalogs and Atlases, Version 2. Explanatory Supplement",
Beichman, C. A., Neugebauer, G., Habing, H. J., Clegg, P. E.,
and Chester, T. J. 1988, NASA Reference Publication, 1190, 1
=1988NASAR1190....1B
Kron, G.E. 1956, PASP 68, 125.
Lindsay, E.M. 1958, MN 118, 172.
Mathewson, D.S., Ford, V.L., Dopita, M.A., Tuohy, I.R., Long, K.S.,
Helfand, D.J., 1983, ApJS 51, 345.
Sanduleak, S.N., MacDonnell, D.J., Davis Philip, A.G., 1978, PASP 90, 621.
Sanduleak, N., Pesch, P., 1981, PASP, 93, 431.
"Smithsonian Astrophysical Observatory Star Catalog", 1966,
Washington D.C. : Smithsonian Institution (version 1984) USA.
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(End) Nancy G. Roman, Gail L. Schneider, Seth W. Digel [SSDOO/ADC] 22-Aug-1997