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 ------------------------------------------------------------- *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