ACDS V10.0 - Wed Jul 17 18:58:56 CEST 2019
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Detailed Description of II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
II/305 SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)
================================================================================
Spitzer Survey of the Magellanic Clouds: Surveying the Agents of a
Galaxy's,Evolution (SAGE and SAGE-SMC)
<IPAC, Caltech (2009)>
2012yCat.2305....0G
================================================================================
ADC_Keywords: Infrared sources ; Photometry, infrared ; Magellanic Clouds
Mission_Name: Spitzer
Description:
The SAGE project is a Cycle 2 legacy program on the Spitzer Space
Telescope, entitled, "Spitzer Survey of the Large Magellanic Cloud:
Surveying the Agents of a Galaxy's Evolution (SAGE)", with Margaret
Meixner (STScI) as the PI. The project overview and initial results
are described in a paper by Meixner et al. (2006AJ....132.2268M).
The Catalog is a highly reliable list of 6.4 million sources. Faint
limits for SAGE are 18.1, 17.5, 15.3, and 14.2 for IRAC 3.6, 4.5, 5.8,
8.0 um, respectively.
The SAGE-SMC project is a Cycle 4 legacy program on the Spitzer Space
Telescope, entitled, "SAGE-SMC: Surveying the Agents of Galaxy Evolution
in the Tidally-Disrupted, Low-Metallicity Small Magellanic Cloud", with
Karl Gordon (STScI) as the PI. The project overview and initial results
are described in a paper by Gordon et al. (2011AJ....142..102G).
The Catalog is a highly reliable list of 2.0 million sources. Faint
limits for SAGE-SMC are 18.3, 17.7, 15.7, and 14.5 for IRAC 3.6, 4.5,
5.8, 8.0 um, respectively.
The archive tables are more complete but less reliable than the catalogs.
IRAC Single Frame + Mosaic Photometry Catalog: a combination of mosaic
photometry source list extracted from the combined Epoch 1 and Epoch 2
12 second frametime mosaics with all-epochs single frame source list,
bandmerged with 2MASS or 2MASS6X. Detailed documentations are available
from http://irsa.ipac.caltech.edu/data/SPITZER/SAGE/doc/ as
SAGEDataProductsDescription_Sep09.pdf and from
http://irsa.ipac.caltech.edu/data/SPITZER/SAGE-SMC/docs/ as
sage-smcdeliveryapr11.pdf
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× catalog.sam 487 500 Sample of SAGE LMC+SMC catalog
(among 8414394 sources)
× archive.sam 487 500 Sample of SAGE LMC+SMC archive
(among 9094829 sources)
See also:
http://sage.stsci.edu/ : SAGE and SAGE-SMC home page
http://data.spitzer.caltech.edu/ : Access to Spitzer data
Byte-by-byte Description of file: catalog.sam archive.sam
Bytes Format Units Label Explanations
1- 19 A19 --- SSTISAGEMC SAGE source designation name (G3)
21- 30 F10.6 deg RAdeg Right ascension (J2000)
32- 41 F10.6 deg DEdeg Declination (J2000)
43- 47 F5.3 arcsec eeMaj [0.3] Semi-major axis of the error ellipse
49- 53 F5.3 arcsec eeMin [0.3] Semi-minor axis of the error ellipse
55- 60 F6.3 deg eePA [90] Position angle of the error ellipse
63- 68 F6.3 mag Jmag ? 2MASS-PSC J magnitude (1.25um)
70- 75 F6.3 mag Hmag ? 2MASS-PSC H magnitude (1.65um)
77- 82 F6.3 mag Kmag ? 2MASS-PSC Ks magnitude (2.17um)
84- 89 F6.3 mag [3.6] ? 3.6um IRAC (Band 1) magnitude
91- 96 F6.3 mag [4.5] ? 4.5um IRAC (Band 2) magnitude
98-103 F6.3 mag [5.8] ? 5.8um IRAC (Band 3) magnitude
105-110 F6.3 mag [8.0] ? 8.0um IRAC (Band 4) magnitude
113-117 F5.3 mag e_Jmag ? 1-{sigma} error on Jmag
119-123 F5.3 mag e_Hmag ? 1-{sigma} error on Hmag
125-129 F5.3 mag e_Kmag ? 1-{sigma} error on Ksmag
131-135 F5.3 mag e_[3.6] ? 1-{sigma} error on [3.6]
137-141 F5.3 mag e_[4.5] ? 1-{sigma} error on [4.5]
143-147 F5.3 mag e_[5.8] ? 1-{sigma} error on [5.8]
149-153 F5.3 mag e_[8.0] ? 1-{sigma} error on [8.0]
155-171 A17 --- 2MASS ? 2MASS PSC (II/246) or 6X (II/281) designation
173-182 F10.3 mJy F(J) ? 2MASS-PSC J flux (1.25um)
184-193 F10.3 mJy e_F(J) ? 1-{sigma} error on fluxJ
195-204 F10.3 mJy F(H) ? 2MASS-PSC H flux (1.65um)
206-215 F10.3 mJy e_F(H) ? 1-{sigma} error on fluxH
217-226 F10.3 mJy F(Ks) ? 2MASS-PSC Ks flux (2.17um)
228-237 F10.3 mJy e_F(Ks) ? 1-{sigma} error on fluxK
239-247 F9.3 mJy F(3.6) ? 3.6um IRAC (Band 1) flux
249-256 F8.3 mJy e_F(3.6) ? 1-{sigma} error on F(3.6)
258-266 F9.3 mJy F(4.5) ? 4.5um IRAC (Band 2) flux
268-275 F8.3 mJy e_F(4.5) ? 1-{sigma} error on F(4.5)
277-285 F9.3 mJy F(5.8) ? 5.8um IRAC (Band 3) flux
287-294 F8.3 mJy e_F(5.8) ? 1-{sigma} error on F(5.8)
296-304 F9.3 mJy F(8.0) ? 8.0um IRAC (Band 4) flux
306-313 F8.3 mJy e_F(8.0) ? 1-{sigma} error on F(8.0)
316-321 F6.2 --- SNJ ? 2MASS J Band Signal/Noise
323-328 F6.2 --- SNH ? 2MASS H Band Signal/Noise
330-335 F6.2 --- SNK ? 2MASS Ks Band Signal/Noise
337-343 F7.2 --- SN3.6 ? 3.6um IRAC (band 1) Signal/Noise
345-351 F7.2 --- SN4.5 ? 4.5um IRAC (band 2) Signal/Noise
353-359 F7.2 --- SN5.8 ? 5.8um IRAC (band 3) Signal/Noise
361-367 F7.2 --- SN8.0 ? 8.0um IRAC (band 4) Signal/Noise
370-377 I8 --- q_Jmag ?=-9 2MASS J Band Source Quality Flag (G1)
379-386 I8 --- q_Hmag ?=-9 2MASS H Band Source Quality Flag (G1)
388-395 I8 --- q_Kmag ?=-9 2MASS Ks Band Source Quality Flag (G1)
397-405 I9 --- q_[3.6] ?=-9 3.6um Source Quality Flag (G1)
407-415 I9 --- q_[4.5] ?=-9 4.5um Source Quality Flag (G1)
417-425 I9 --- q_[5.8] ?=-9 5.8um Source Quality Flag (G1)
427-435 I9 --- q_[8.0] ?=-9 8.0um Source Quality Flag (G1)
438-439 I2 --- N3.6 Number of detections for 3.6um
441-442 I2 --- N4.5 Number of detections for 4.5um
444-445 I2 --- N5.8 Number of detections for 5.8um
447-448 I2 --- N8.0 Number of detections for 8.0um
450-451 I2 --- n3.6 Number of possible detections for 3.6um
453-454 I2 --- n4.5 Number of possible detections for 4.5um
456-457 I2 --- n5.8 Number of possible detections for 5.8um
459-460 I2 --- n8.0 Number of possible detections for 8.0um
463-467 I5 --- mf3.6 ?=-9 Flux calculation method for 3.6um (G2)
469-473 I5 --- mf4.5 ?=-9 Flux calculation method for 4.5um (G2)
475-479 I5 --- mf5.8 ?=-9 Flux calculation method for 5.8um (G2)
481-485 I5 --- mf8.0 ?=-9 Flux calculation method for 8.0um (G2)
487 I1 --- C [0/1]? '0' for sources existing only in
the archive (in "sage_arc" file only)
Global Notes:
Note (G1): Source Quality Flag (sqf)
0 OK - no problems encountered
-------------------------------------------------------------
bit Explanation Survey
-------------------------------------------------------------
1 poor pixels in dark current SAGE
2 flat field applied using questionable value SAGE
3 latent image SAGE
3 persistence ("p" in "cc" flag) 2MASS
4 saturated star correction SAGE
4 photometric confusion ("c" in "cc" flag) 2MASS
7 muxbleed correction applied SAGE
*8 hot, dead or otherwise unacceptable pixel SAGE
9 muxbleed > 3-sigma above the background SAGE
9 electronic stripe ("s" in "cc" flag) 2MASS
10 DAOPHOT tweak positive SAGE
11 DAOPHOT tweak negative SAGE
*13 confusion in in-band merge SAGE
*14 confusion in cross-band merge SAGE
*15 column pulldown correction SAGE
*16 banding correction SAGE
17 stray light SAGE
19 nonlinear correction not applied SAGE
*20 saturated star wing region SAGE
20 diffraction spike ("d" in "cc" flag) 2MASS
21 pre-lumping in in-band merge SAGE
22 post-lumping in cross-band merge SAGE
23 2MASS Quality flag (*) 2MASS
24 2MASS Quality flag (*) 2MASS
24 in-band merge confusion (mosaic entry) SAGE
25 2MASS Quality flag (*) 2MASS
*30 edge of frame (within 3 pixels of edge) SAGE
31 truth list (for simulated data) SAGE
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*The flags to possibly cull on. (Note that flag 8,20, and 30
have already been removed from Catalog or nulled.)
(*) the 2MASS quality is stored here on 3 bits (25,24,23), with
A (best): all three flags set to 1 (bit pattern 111)
B (2nd) : bit pattern 110 ...
E (poor): bit pattern 011
F (none): bit pattern 010
U (upper limit): 001
X (no valid estimate) 000
-------------------------------------------------------------
For 2MASS data, the 2MASS PSC flags are mapped into bits 3,4,20,
and 9 in the source quality flag.
bit values (2bit-1):
1=>1; 2=>2; 3=>4; 4=>8; 5=>16; 6=>32; 7=>64; 8=>128; 9=>256;
10=>512; 11=>1024; 12=>2048; 13=>4096; 14=>8192; 15=>16384;
16=>32768; 17=>65536; 18=>131072; 19=>262144; 20=>524288;
21=>1048576; 22=>2097152; 30=>536870912; 31=>1073741824
Note (G2): Flux calculation method Flag (mf)
mf indicates by bit whether a given exposure time was present, and
whether that exposure time was used in the final flux.
---------------------
present used
---------------------
exp bit bit
---------------------
0.6 1 2
1.2 3 4
2 5 6
12 7 8
30 9 10
100 11 12
mosaic 13 14
addBack 15
---------------------
i.e. if 0.6 and 12 were present, but only 12 was used, then bits
1 and 5 will be set (fluxes present) and bit 6 will be set (12s used),
and the mflag will be 1+16+32=49.
For SAGE HDR mode (High Dynamic Range), the relevant numbers
work out to be:
3 = short exp data used, long exp data absent
67 = short used, long present but unused
192 = long exp used, short absent
193 = long exp used, short present but unused
195 = both long and short present and used
4099 = 0.6 sec data, mosaic photometry data present
4163 = 0.6 sec data, 12 sec and mosaic present
4288 = 12 sec data, mosaic present
4291 = 12 sec and 0.6 sec data, mosaic present
12288 = mosaic photometry only, present and used
12352 = mosaic photometry present and used, 12 sec present
12353 = mosaic photometry present and used, 0.6 and 12 sec present
>16384 = an addBack source
Note (G3): the recommended designations are:
* SSTISAGEMC for the Catalog sources, followed by the
truncated J2000 position (JHHMMSS.ss+DDMMSS.s)
* SSTISAGEMA for the Archive sources, followed by the
truncated J2000 position (JHHMMSS.ss+DDMMSS.s)
History:
* 22-Feb-2012: SAGE-catalog only
* 24-Jan-2013: includes both catalog and archive
* 03-Jun-2013: addition of epoch catalog and archive
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(End) Laurent Cambresy [CDS] 22-Feb-2012