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 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 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 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:
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FileName Lrecl Records Explanations
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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
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Bytes Format Units Label Explanations
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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-σ error on Jmag
119-123 F5.3 mag e_Hmag ? 1-σ error on Hmag
125-129 F5.3 mag e_Kmag ? 1-σ error on Ksmag
131-135 F5.3 mag e_[3.6] ? 1-σ error on [3.6]
137-141 F5.3 mag e_[4.5] ? 1-σ error on [4.5]
143-147 F5.3 mag e_[5.8] ? 1-σ error on [5.8]
149-153 F5.3 mag e_[8.0] ? 1-σ 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-σ 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-σ 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-σ 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-σ 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-σ 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-σ 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-σ 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)
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Global Notes:
Note (G1): Source Quality Flag (sqf)
0 OK - no problems encountered
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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
(End) Laurent Cambresy [CDS] 22-Feb-2012