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J/AJ/136/18         LMC SAGE. New candidate YSOs             (Whitney+, 2008)

Spitzer SAGE survey of the Large Magellanic Cloud. III. Star formation and ∼1000 new candidate young stellar objects. Whitney B.A., Sewilo M., Indebetouw R., Robitaille T.P., Meixner M., Gordon K., Meade M.R., Babler B.L., Harris J., Hora J.L., Bracker S., Povich M.S., Churchwell E.B., Engelbracht C.W., For B.-Q., Block M., Misselt K., Vijh U., Leitherer C., Kawamura A., Blum R.D., Cohen M., Fukui Y., Mizuno A., Mizuno N., Srinivasan S., Tielens A.G.G.M., Volk K., Bernard J.-P., Boulanger F., Frogel J.A., Gallagher J., Gorjian V., Kelly D., Latter W.B., Madden S., Kemper F., Mould J.R., Nota A., Oey M.S., Olsen K.A., Onishi T., Paladini R., Panagia N., Perez-Gonzalez P., Reach W., Shibai H., Sato S., Smith L.J., Staveley-Smith L., Ueta T., Van Dyk S., Werner M., Wolff M., Zaritsky D. <Astron. J., 136, 18-43 (2008)> =2008AJ....136...18W
ADC_Keywords: Magellanic Clouds ; YSOs ; Photometry, infrared Keywords: circumstellar matter - galaxies: dwarf - infrared: stars - Magellanic Clouds - stars: formation - stars: pre-main sequence Abstract: We present ∼1000 new candidate Young Stellar Objects (YSOs) in the Large Magellanic Cloud selected from Spitzer Space Telescope data, as part of the Surveying the Agents of a Galaxy's Evolution (SAGE) Legacy program. The YSOs, detected by their excess infrared (IR) emission, represent early stages of evolution, still surrounded by disks and/or infalling envelopes. Previously, fewer than 20 such YSOs were known. The candidate YSOs were selected from the SAGE Point Source Catalog from regions of color-magnitude space least confused with other IR-bright populations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 191 1197 YSO candidates: fluxes table2.dat 146 1197 YSO candidates: magnitudes table3.dat 85 19 Previously known YSOs table4.dat 119 19 *Previously known YSOs: magnitudes table5.dat 112 299 Physical parameters of selected YSO candidates
Note on table4.dat: Magnitudes from the SAGE Catalog are given where available.
See also: J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006) J/AJ/135/726 : Spitzer SAGE observations of LMC PNe (Hora+, 2008) J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008) J/PASP/122/683 : SAGE-Spec Spitzer legacy program (Kemper+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Running identification number, <[WSI2008] NNNN> in Simbad 6- 15 A10 --- --- [SSTISAGE1C] 16- 34 A19 --- SSTISAGE1C IRAC designation, JHHMMSS.ss+DDMMSS.s 37- 45 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 47- 56 F10.6 deg DEdeg Declination in decimal degrees (J2000) 58- 62 F5.3 arcsec Off ?=- IRAC/MIPS position offset 64- 70 F7.2 mJy FJ ?=-999.9 2MASS J band flux density 72- 78 F7.2 mJy e_FJ ?=-999.9 Error in FJ 80- 86 F7.2 mJy FH ?=-999.9 2MASS H band flux density 88- 94 F7.2 mJy e_FH ?=-999.9 Error in FH 96-102 F7.2 mJy FKs ?=-999.9 2MASS Ks band flux density 104-110 F7.2 mJy e_FKs ?=-999.9 Error in FKs 112-118 F7.2 mJy F3.6 ?=-999.9 Spitzer/IRAC 3.6um band flux density 120-126 F7.2 mJy e_F3.6 ?=-999.9 Error in F3.6 128-134 F7.2 mJy F4.5 ?=-999.9 Spitzer/IRAC 4.5um band flux density 136-142 F7.2 mJy e_F4.5 ?=-999.9 Error in F4.5 144-150 F7.2 mJy F5.8 ?=-999.9 Spitzer/IRAC 5.8um band flux density 152-158 F7.2 mJy e_F5.8 ?=-999.9 Error in F5.8 160-166 F7.2 mJy F8.0 ?=-999.9 Spitzer/IRAC 8.0um band flux density 168-174 F7.2 mJy e_F8.0 ?=-999.9 Error in F8.0 176 A1 --- l_F24 Limit flag on F24 177-183 F7.2 mJy F24 ?=-999.9 Spitzer/MIPS 24um band flux density 185-191 F7.2 mJy e_F24 ?=-999.9 Error in F24
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Running identification number, <[WSI2008] NNNN> in Simbad 6- 14 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000) 16- 25 F10.6 deg DEdeg Declination in decimal degrees (J2000) 27- 32 F6.3 mag Jmag ?=99.999 2MASS J band magnitude 34- 39 F6.3 mag e_Jmag ?=99.999 Error in Jmag 41- 46 F6.3 mag Hmag ?=99.999 2MASS H band magnitude 48- 53 F6.3 mag e_Hmag ?=99.999 Error in Hmag 55- 60 F6.3 mag Ksmag ?=99.999 2MASS Ks band magnitude 62- 67 F6.3 mag e_Ksmag ?=99.999 Error in Ksmag 69- 74 F6.3 mag [3.6] ?=99.999 Spitzer/IRAC 3.6um band magnitude 76- 81 F6.3 mag e_[3.6] ?=99.999 Error in [3.6] 83- 88 F6.3 mag [4.5] ?=99.999 Spitzer/IRAC 4.5um band magnitude 90- 95 F6.3 mag e_[4.5] ?=99.999 Error in [4.5] 97-102 F6.3 mag [5.8] ?=99.999 Spitzer/IRAC 5.8um band magnitude 104-109 F6.3 mag e_[5.8] ?=99.999 Error in [5.8] 111-116 F6.3 mag [8.0] ?=99.999 Spitzer/IRAC 8.0um band magnitude 118-123 F6.3 mag e_[8.0] ?=99.999 Error in 8.0] 125 A1 --- l_[24] Limit flag on [24] 126-131 F6.3 mag [24] ?=99.999 Spitzer/MIPS 24um band magnitude 133-138 F6.3 mag e_[24] ?=99.999 Error in [24] 140-146 A7 --- Class Classification (1)
Note (1): Classification code as follows: YSO = Young Stellar Object YSO_hp = high probability YSO (Section 3.4) PN = Planetary Nebula Evolved = this category includes Wolf-Rayet, Emission Line, post-AGB, C-rich AGB stars, and Cepheids galaxy = probable background galaxy x-ray = SIMBAD identified x-ray source SN87a = SN87a
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Name Source name 20 A1 --- n_Name Individual notes (1) 22- 23 I2 h RAh Right ascension (J2000) 25- 26 I2 min RAm Right ascension (J2000) 28- 32 F5.2 s RAs Right ascension (J2000) 34 A1 --- DE- Declination sign (J2000) 35- 36 I2 deg DEd Declination (J2000) 38- 39 I2 arcmin DEm Declination (J2000) 41- 44 F4.1 arcsec DEs Declination (J2000) 46- 55 A10 --- --- [SSTISAGE1C] 57- 75 A19 --- SSTISAGE1C IRAC designation (JHHMMSS.ss+DDMMSS.s) 77- 79 F3.1 arcsec Sep1 ? Separation IRAC/MIPS 80 A1 --- --- [/] 81- 83 F3.1 arcsec Sep2 ? Second separation IRAC/MIPS 85 I1 --- Ref Reference (G1)
Note (1): Notes as follows: a = P2 was resolved into two components by Testor et al. (2006, Cat. J/A+A/453/517, resolution 0.2"): N159A7-121 (alpha=05:39:41.96, delta=-69:46:11.99, J2000) and N159A7-123 (alpha=05:39:41.90, delta=-69:46:11.52, J2000), both classified as Class I YSOs. b = The compact source N159A6 discovered by Testor et al. (2006, Cat. J/A+A/453/517) consists of two objects contained within a diameter of 0.5pc: an YSO N159A6-151 and a CHII/HII region containing about five stars. At the IRAC resolution of 2" (0.48pc at 50kpc), N159A6 will be either unresolved or only slightly resolved. c = LTS ("LMC T Tauri Star") J054427-692659 is the first spectroscopically confirmed discovery of T Tauri star in the LMC d = ELHC stands for EROS LMC HAe/Be Candidates Lamers et al. (1999A&A...341..827L). ELHC7 is a confirmed HAe/Be UX Orionis star. e = de Wit et al. (2005A&A...432..619D) suggested that the type of variability of these sources could be interpreted as caused by variable dust obscuration; thus it is possible that they are pre-MS objects. However, these sources lack thermal dust emission in the near IR. The circumstellar dust emission could be revealed in the mid- or far IR; thus the observations at these wavelengths are crucial to confirm that these objects are in a pre-MS stage.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Name Source name 21 A1 --- l_Jmag Limit flag on Jmag 22- 26 F5.2 mag Jmag ? 2MASS J magnitude 28- 31 F4.2 mag e_Jmag ? rms uncertainty in Jmag 32 A1 --- n_Jmag [b] Note (2) 34 A1 --- l_Hmag Limit flag on Hmag 35- 39 F5.2 mag Hmag ? 2MASS H magnitude 41- 44 F4.2 mag e_Hmag ? rms uncertainty in Hmag 45 A1 --- n_Hmag [b] Note (2) 47- 51 F5.2 mag Ksmag ? 2MASS Ks magnitude 53- 56 F4.2 mag e_Ksmag ? rms uncertainty in Ksmag 57 A1 --- n_Ksmag [b] Note (2) 59- 63 F5.2 mag [3.6] ? Spitzer/IRAC 3.6um magnitude 65- 68 F4.2 mag e_[3.6] ? rms uncertainty in [3.6] 69 A1 --- n_[3.6] [bc] Note (2) 71- 75 F5.2 mag [4.5] ? Spitzer/IRAC 4.5um magnitude 77- 80 F4.2 mag e_[4.5] ? rms uncertainty in [4.5] 81 A1 --- n_[4.5] [bc] Note (2) 83- 87 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um magnitude 89- 92 F4.2 mag e_[5.8] ? rms uncertainty in [5.8] 93 A1 --- n_[5.8] [bc] Note (2) 95- 99 F5.2 mag [8.0] ? Spitzer/IRAC 8.0um magnitude 101-104 F4.2 mag e_[8.0] ? rms uncertainty in [8.0] 105 A1 --- n_[8.0] [bc] Note (2) 107 A1 --- l_[24] Limit flag on [24] 108-111 F4.2 mag [24] ? Spitzer/MIPS 24um magnitude 113-116 F4.2 mag e_[24] ? rms uncertainty in [24] 117 A1 --- n_[24] [bcd] Note (2) 119 I1 --- Ref References (G1)
Note (2): Notes as follows: b = Data from literature (see references below) c = Magnitudes measured in this work using aperture photometry d = Source saturated at 24um
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Running identification number, <[WSI2008] NNNN> in Simbad 6- 15 A10 --- --- [SSTISAGE1C] 16- 34 A19 --- SSTISAGE1C IRAC designation, JHHMMSS.ss+DDMMSS.s 36- 39 F4.2 --- chi2 Minimum χ2 per datapoint 41- 43 I3 --- nfits Number of fits (1) 45- 49 F5.2 Msun M* ?=0 Average stellar mass 51- 54 F4.2 Msun e_M* ?=0 Standard deviation in M* 56- 63 E8.3 Lsun Lum ?=0 Average stellar luminosity 65- 72 E8.3 Lsun e_Lum ?=0 Standard deviation in Lum 74- 81 E8.3 Msun/yr Mdot ?=0 Average envelope infall rate 83- 90 E8.3 Msun/yr e_Mdot ?=0 Standard deviation in Mdot 92- 99 E8.3 Msun Mdisk ?=0 Average disk mass 101-108 E8.3 Msun e_Mdisk ?=0 Standard deviation in Mdisk 110-112 A3 --- Stage ?=0 Average evolutionary stage (2)
Note (1): With cpd between cpdmin and cpdmin+1. Note (2): Average evolutionary stage code as follows: I = young embedded II = optically thick disk III = optically thin disk
Global notes: Note (G1): References as follows: 1 = Brandner et al. (2001AJ....122..858B) 2 = Jones et al. (2005ApJ...620..731J) 3 = Testor et al. (2006, Cat. J/A+A/453/517) 4 = Epchtein et al. (1984A&A...140...67E) 5 = van Loon et al. (2005MNRAS.364L..71V) 6 = Oliveira et al. (2006MNRAS.372.1509O) 7 = Chu et al. (2005ApJ...634L.189C) 8 = Wichmann et al. (2001A&A...380L...9W) 9 = de Wit et al. (2005A&A...432..619D), and references therein.
History: From electronic version of the journal References: Meixner et al., Paper I 2006AJ....132.2268M, Cat. J/AJ/132/2268 Blum et al., Paper II 2006AJ....132.2034B Bernard et al., Paper IV 2008AJ....136..919B
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 15-Jan-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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