II/243 The ISOGAL Point Source Catalogue - IGPSC (Omont+ 2003)
ISOGAL: A deep survey of the obscured inner Milky Way with ISO at 7um and 15um
and with DENIS in the near-infrared.
Omont A., Gilmore G.F., Alard C., Aracil B., August T., Baliyan K.,
Beaulieu S., Begon S. , Bertou X., Blommaert J.A.D.L., Borsenberger J.,
Burgdorf M., Caillaud B., Cesarsky C., Chitre A., Copet E., de Batz B.,
Egan M.P., Egret D., Epchtein N., Felli M., Fouque P., Ganesh S. ,
Genzel R., Glass I.S., Gredel R., Groenewegen M.A.T., Guglielmo F.,
Habing H.J. , Hennebelle P., Jiang B., Joshi U.C., Kimeswenger S.,
Messineo M., Miville-Deschenes M.A. , Moneti A., Morris M., Ojha D.K.,
Ortiz R., Ott S., Parthasarathy M., Perault M., Price S.D. , Robin A.C.,
Schultheis M., Schuller F., Simon G., Soive A., Testi L., Teyssier D.,
Tiphene D. , Unavane M., van Loon J.T., Wyse R.
<Astron. Astrophys. 403, 975 (2003)>
=2003A&A...403..975O 2003A&A...403..975O
Explanatory supplement of the ISOGAL-DENIS. Point Source Catalogue.
Schuller F., Ganesh S., Messineo M., Moneti A., Blommeart J.A.D.L.,
Alard C., Aracil B., Miville-Deschenes M.-A., Omont A., Schultheis M.,
Simon G., Soive A., Testi L.
<Astron. Astrophys. 403, 955 (2003)>
=2003A&A...403..955S 2003A&A...403..955S
ADC_Keywords: Infrared sources; Galactic plane; Milky Way; Photometry, infrared
Mission_Name: ISO
Keywords: Catalogs - Stars: circumstellar matter - Galaxy: bulge -
Galaxy: disk - Galaxy: stellar content - Infrared: stars
Description:
The ISOGAL survey is one of the largest imaging programme performed by
the ISO satellite. About 16deg2 mainly distributed in the inner
Galactic disk were mapped at 7 and/or 15 micron (µm). Because of
highly structured background and high source density, a special point
source extraction algorithm was used and resulted in a 100000 point
source catalogue. The mid-infrared data have been associated with
near-infrared DENIS sources, providing an up to five wavelength
photometric catalogue with a typical astrometric accuracy better than
1 arcsecond. The point source catalogue contains the positional and
photometric parameters of all ISOGAL sources, together with various
quality flags aimed at giving an estimate of the reliability of the
detections and of the associations between the different bands (see
the paper for a complete description).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
psc1.dat 267 93385 Point sources inside the defined fields
psc2.dat 267 12765 Point sources outside the limits of the fields
fields.dat 115 263 Definitions of ISOGAL fields
isoobs.dat 148 384 Parameters of ISOGAL observations
denis.dat 57 1352 Parameters of DENIS observations
ghosts1.dat 52 68010 Spurious sources extracted only with the
'inversion' process
ghosts2.dat 52 14035 Spurious sources with bad reliability indicators
ghosts3.dat 52 6174 Probable remnants of strong sources
rasters/* . 384 Rasters images
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See also:
B/iso : ISO Observation Log of validated data (ISO Data Centre, 2001)
B/denis : The DENIS database (Epchtein+, 1999)
V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996)
V/107 : MSX5C Infrared Point Source Catalog (Egan+ 1999)
Byte-by-byte Description of files: psc1.dat psc2.dat
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Bytes Format Units Label Explanations
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1 A1 --- n_Seq [E] for extended part (psc2, outside fields)
2- 5 I04 --- Seq Source identification number in the field (1)
7- 14 A8 --- --- [ISOGAL-P-]
15- 31 A17 --- Name Source identifier (J2000) (2)
33- 40 F8.4 deg RAdeg Right ascension (J2000) (3)
42- 49 F8.4 deg DEdeg Declination (J2000) (3)
51- 58 F8.4 deg RAISOGAL ISOGAL right ascension (J2000)
60- 67 F8.4 deg DEISOGAL ISOGAL declination (J2000)
69- 76 F8.4 deg GLON ]-180,180] Galactic longitude
78- 85 F8.4 deg GLAT Galactic latitude
87-100 A14 --- Ifield ISOGAL field name
102-108 A7 --- Dfield DENIS image name (4)
110-114 F5.2 mag Imag ?=99.99 DENIS I-band magnitude (5)
116-119 F4.2 --- Icorr DENIS I-band correlation factor
121-125 F5.1 pix Ixpos X-position in DENIS I-band image
127-131 F5.1 pix Iypos Y-position in DENIS I-band image
133-137 F5.2 mag Jmag ?=99.99 DENIS J-band magnitude (5)
139-142 F4.2 --- Jcorr DENIS J-band correlation factor
144-148 F5.1 pix Jxpos X-position in DENIS J-band image
150-154 F5.1 pix Jypos Y-position in DENIS J-band image
156-160 F5.2 mag Kmag ?=99.99 DENIS Ks-band magnitude (5)
162-165 F4.2 --- Kcorr DENIS Ks-band correlation factor
167-171 F5.1 pix Kxpos X-position in DENIS K-band image
173-177 F5.1 pix Kypos Y-position in DENIS K-band image
179-183 F5.2 mag mag7 ?=99.99 ISO/LW2 ISOGAL 7um magnitude (5)
185-188 F4.2 mag e_mag7 Uncertainty in 7um magnitude
190-190 I1 --- filt7 LW number of filter used at 7 micron
192-192 I1 arcsec pfov7 Pixel field of view at 7 micron
194-199 F6.2 pix xpos7 X-position on ISOGAL final 7 micron image
201-206 F6.2 pix ypos7 Y-position on ISOGAL final 7 micron image
208-208 I1 --- npix7 [0,7] Npix flag at 7 micron (6)
210-210 I1 --- mesh7 [0,3] Mesh flag at 7 micron (7)
212-212 I1 --- edge7 [0,1] Edge flag at 7 micron (8)
214-214 I1 --- qual7 [0,4] Global quality flag at 7 micron
216-220 F5.2 mag mag15 ?=99.99 ISO/LW3 ISOGAL 15um magnitude (5)
222-225 F4.2 mag e_mag15 Uncertainty in 15um magnitude
227-227 I1 --- filt15 LW number of filter used at 15 micron
229-229 I1 arcsec pfov15 Pixel field of view at 15 micron
231-236 F6.2 pix xpos15 X-position on ISOGAL final 15 micron image
238-243 F6.2 pix ypos15 Y-position on ISOGAL final 15 micron image
245-245 I1 --- npix15 [0,7] Npix flag at 15 micron (6)
247-247 I1 --- mesh15 [0,3] Mesh flag at 15 micron (7)
249-249 I1 --- edge15 [0,1] Edge flag at 15 micron (8)
251-251 I1 --- qual15 [0,4] Global quality flag at 15 micron (9)
253-257 F5.2 arcsec disII Distance 7 to 15 micron associated sources
259-259 I1 --- assII [0,4] 7-15 micron association quality flag (10)
261-265 F5.2 arcsec disID Distance ISOGAL to DENIS associated sources
267-267 I1 --- assID [0,5] ISOGAL-DENIS association quality
flag (11)
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Note (1): These numbers increase with right ascension within each field.
The field name is given in (Ifield) column.
Note (2): The source names follow the format ISOGAL-PJhhmmss.s+ddmmssX,
where hhmmss.s+ddmmss are the J2000 coordinates as they appear in
RAdeg and DEdeg columns, and the last character 'X' is only present
when two sources with the same position have to be distinguished.
Note (3): The final adopted coordinates (RAdeg and DEdeg) are the DENIS
ones if there is an association, or the ISO corrected to DENIS if an
observation exists but no source was associated. In the northern
fields (without DENIS), the coordinates are the 7µm ones if they
exist, or the 15µm ones for the sources in FB fields, and the
15µm corrected to 7µm for the sources detected only at 15µm
in the FC fields. When no DENIS association exists, RAJ2000 = RAISOGAL
and DEJ2000 = DEISOGAL.
Note (4): Only the seven last digits of the DENIS numbers have been stored,
as the three first ones are always 000.
Note (5): A value of 88.88 for a magnitude means that this position
was not observed at this wavelength, while a value of 99.99 means that
the source was not detected at this wavelength.
Note (6): Npix flags:
The NPIX flag is the integer part of one tenth of the weighted number
of measurements usable at the central position of the source, as given
in the third plane of the OLP7 processed FITS files. As each raster
position has been observed on average 19x1.5 times, typical "good
quality" values of this flag are in the range 2 to 4. Note that this
flag is rather an indication of the number of good exposures than a
number of pixels involved, but we decided to keep the NPIX name, as it
appears in the header of the OLP7 processed files.
Note (7): Mesh flags:
1 for sources which have been detected only with mesh = 1
2 for sources which have been detected only with mesh = 2
3 for the sources which could be associated between the two extractions,
thus making their reality more trustful.
Note (8): Edge flags:
1 when the centre of the source is at a distance between two and
five pixels from the edge of the observed raster (taking into
account the saw-tooth borders),
0 when the distance is greater than five pixels.
Note (9): Global quality flag at 15 micron:
4: very good photometric quality
3: reasonably good quality
2: moderate photometric quality
Note (10): 7-15 micron association quality flag:
4: the separation between the 7um and the 15um sources is ≤1pixel
and there is only one possible association within a radius of 2 pixels
3: the separation is still ≤ 1 pixel but there is another 15um
source at less than 2 pixels
2: the separation is between 1 and 2 pixels, and there is no other
source within a radius of 2 pixels
1: the separation is between 1 and 2 pixels, and there is at least
2 sources within a radius of 2 pixels
Note (11): ISOGAL-DENIS association quality flag:
5: highest quality
0: no association
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Byte-by-byte Description of file: fields.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Ifield ISOGAL field identifier (1)
16- 23 I08 --- ION7 ISO Observation Number for 7 micron data
25- 32 I08 --- ION15 ISO Observation Number for 15 micron data
34- 34 I1 --- filt7 7 micron LW filter number
36- 36 I1 --- filt15 15 micron LW filter number
38- 38 I1 arcsec pfov Pixel field of view
40- 47 F8.4 deg GLON ]-180,180] Galactic longitude of field centre
49- 56 F8.4 deg GLAT Galactic latitude of field centre
58- 63 F6.4 deg dl Half width of field in longitude (2)
65- 70 F6.4 deg db Half width of field in latitude (2)
72- 77 F6.4 deg2 area Area of field
79- 83 I5 deg-2 dens7 Density of 7 micron confident sources
85- 89 I5 deg-2 dens15 Density of 15 micron confident sources
91- 94 F4.2 arcsec RMSII RMS of 7-15 micron separations of
associated sources
96- 99 F4.2 arcsec RMSID RMS of ISO-DENIS separations of associated
sources
101-104 F4.1 mag Kmax1 DENIS Ks magnitude cutoff 1 (3)
106-109 F4.1 mag Kmax2 DENIS Ks magnitude cutoff 2 (4)
111-115 I5 deg-2 densKs Density of DENIS Ks sources brighter than
K_max2 (5)
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Note (1): The field names are generated using 14 characters.
The first two indicate the type of the field (FA: 7 micron only, FB:
15 micron only, or FC: 7 and 15 micron). The 12 last characters are the
galactic coordinates in decimal degrees of the centre of the field.
Note (2): dl and db apply to the limits inside the edges of the images
within which sources are accepted.
Note (3): Maximum DENIS Ks magnitude limiting the density of Ks DENIS
sources to ∼18000 sources per square degree if the ISO images have 6"
pixels (or to ∼72000 sources per square degree for the 3" ISO
observations). It is used to discuss the quality of ISOGAL-DENIS
associations.
Note (4): Maximum DENIS Ks magnitude accepted in order to avoid spurious
cross-identifications. The density of Ks DENIS sources is limited to
∼36000 sources per square degree for 6" ISO observations (and again to
∼72000 sources per square degree for 3" ISO observations).
Note (5): Density of DENIS Ks sources brighter than the cutoff magnitude K_max2.
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Byte-by-byte Description of file: isoobs.dat
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Bytes Format Units Label Explanations
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1- 8 I08 --- ION ISO Observation Number
10- 22 A13 --- Name ISOGAL observation name
24- 29 A6 "YYMMDD" Date Date of observation (YYMMDD)
31- 34 I4 d JD-2450000 Julian day of observation -2450000
36- 36 I1 --- qual [1,2] Quality of image (1)
38- 42 F5.1 arcsec oGLON Applied offset in Galactic longitude (2)
44- 48 F5.1 arcsec oGLAT Applied offset in Galactic latitude (2)
50- 57 F8.4 deg GLON ]-180,180] Galactic longitude of
image centre
59- 66 F8.4 deg GLAT Galactic latitude of image centre
68- 73 F6.4 deg dl Half width of raster in longitude
75- 80 F6.4 deg db Half width of raster in latitude
82- 89 F8.4 deg RAdeg Right ascension (J2000) of image centre
91- 98 F8.4 deg DEdeg Declination (J2000) of image centre
100-100 I1 --- filt LW filter number (5)
102-102 I1 arcsec pfov Pixel field of view
104-108 F5.2 mag magmax ISO magnitude cutoff (3)
110-113 I4 --- nbsrc Number of confident sources brighter
than magmax
115-115 I1 --- rot [0,1] Applied 270 deg rotation to the
image (4)
117-117 I1 --- xinv [0,1] Applied x-inversion to the image (4)
119-119 I1 --- yinv [0,1] Applied y-inversion to the image (4)
121-122 I2 arcsec Nstepx Number of raster steps in x
124-125 I2 arcsec Nstepy Number of raster steps in y
127-129 I3 arcsec dNstepx Size of step between x raster positions
131-133 I3 arcsec dNstepy Size of step between y raster positions
135-140 F6.2 deg Angle Position angle from north of the final image
142-144 I3 pix NpixX Number of pixels in x of final image
146-148 I3 pix NpixY Number of pixels in y of final image
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Note (1): Quality of the image:
1 is standard quality,
2 is medium quality (in most cases, the problem is that the first
individual image of the raster appears brighter than the other ones).
Images of bad quality have not been used to build the catalogue.
Note (2): The astrometry of the published raster images has been corrected
to match the DENIS astrometry if any. The offset values given in this
table have been added to the initial raster coordinates.
Note (3): The ISO magnitude cutoff has been computed for each observation
to correspond at least approximately to a 50% completeness level.
Note (4): All the published images are oriented with l along decreasing x
and b along increasing y. In each column, a 1 means that the
corresponding transformation has been applied to the initial (OLP7
processed) raster, and a 0 means that this transformation was not
needed.
Note (5): filters 2, 5, 6 are in the short wavelength range (7um),
while filters 3, 9 are in the longer wavelength range (15um).
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Byte-by-byte Description of file: denis.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Dfield DENIS image number
9- 14 A6 "YYMMDD" Date Date of observation (YYMMDD)
16- 19 I4 d JD-2450000 Julian day of observation -2450000
21- 28 F8.4 deg RAdeg Right ascension (J2000) of image centre
30- 37 F8.4 deg DEdeg Declination (J2000) of image centre
39- 45 F7.3 deg GLON ]-180,180] Galactic longitude of
image centre
47- 53 F7.3 deg GLAT Galactic latitude of image centre
55 I1 --- q_I [0,3]? Quality flag of I image (1)
56 I1 --- q_J [0,3]? Quality flag of J image (1)
57 I1 --- q_Ks [0,3] Quality flag of Ks image (1)
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Note (1): Image quality flags:
0: very bad
3: very good
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Byte-by-byte Description of files: ghosts1.dat ghosts2.dat ghosts3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Seq Identification number in the ION
7- 14 F8.4 deg RAdeg ISOGAL RA (J2000)
16- 23 F8.4 deg DEdeg ISOGAL Dec (J2000)
25- 29 F5.2 mag mag ISOGAL magnitude
31- 38 I08 --- ION ISO observation number
40- 45 F6.2 pix xpos X-position on ISOGAL final image
47- 52 F6.2 pix ypos Y-position on ISOGAL final image
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History:
* 16-Apr-2003: First version
* 23-Jun-2003: Completed version of file 'denis.dat' (1352 records
instead of 1272) was prepared by Guy Simon (Paris-Meudon Obs.)
(End) Frederic Schuller [CNRS/IAP - Paris] 23-Jun-2003