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J/ApJ/683/822    Star formation in Ophiuchus and Perseus II.  (Jorgensen+, 2008)

Current star formation in the Ophiuchus and Perseus molecular clouds: constraints and comparisons from unbiased submillimeter and mid-infrared surveys. II. Jorgensen J.K., Johnstone D., Kirk H., Myers P.C., Allen L.E., Shirley Y.L. <Astrophys. J., 683, 822-843 (2008)> =2008ApJ...683..822J
ADC_Keywords: YSOs ; Photometry, millimetric/submm ; Cross identifications ; Molecular clouds Keywords: ISM: clouds - ISM: evolution - ISM: individual (Ophiuchus, Perseus) - stars: formation - stars: pre-main sequence Abstract: We present a census of the population of deeply embedded young stellar objects (YSOs) in the Ophiuchus molecular cloud complex based on a combination of Spitzer Space Telescope mid-infrared data from the "Cores to Disks" (c2d) legacy team and JCMT/SCUBA submillimeter maps from the COMPLETE team. We have applied a method developed for identifying embedded protostars in Perseus to these data sets and in this way construct a relatively unbiased sample of 27 candidate embedded protostars with envelopes more massive than our sensitivity limit (about 0.1M). Description: The Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) mapped the cloud in 850um dust continuum emission at 15" resolution as previously presented by Johnstone et al. (2004ApJ...611L..45J). For the present analysis these data were re-reduced and combined with all other SCUBA archive data. Ophiuchus was mapped at 3.6, 4.5, 5.8, 8.0, 24, 70, and 160um using the Spitzer Space Telescope IRAC and MIPS cameras by c2d. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 103 27 List of candidate embedded YSOs in Ophiuchus table3.dat 103 11 List of candidate embedded YSOs for sources with separations of 15"-30" of a MIPS source table4.dat 103 6 List of candidate embedded YSOs for interesting MIPS sources with very red colors, but no associated SCUBA flux (e.g., candidate edge-on disks) table7.dat 77 66 Properties of submillimeter cores in Ophiuchus
See also: J/ApJ/671/1800 : SCUBA observations of ρ Oph cloud (Andrews+, 2007) J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994) : C2D Spitzer home page Byte-by-byte Description of file: table[134].dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh c2d Hour of right ascension (J2000) (1) 4- 5 I2 min RAm c2d Minute of right ascension (J2000) (1) 7- 11 F5.2 s RAs c2d Second of right ascension (J2000) (1) 13 A1 --- DE- c2d Declination sign (J2000) (1) 14- 15 I2 deg DEd c2d Degree of declination (J2000) (1) 17- 18 I2 arcmin DEm c2d Arcminute of declination (J2000) (1) 20- 23 F4.1 arcsec DEs c2d Arcsecond of declination (J2000) (1) 25- 28 F4.2 --- Conc Concentration of the nearest SCUBA core 30- 33 F4.2 --- 3.6-4.5 ? Spitzer [3.6]-[4.5] color index 35- 38 F4.2 --- 8.0-24 ? Spitzer [8.0]-[24.0] color index 40- 45 F6.1 arcsec Sep Separation between the Spitzer source and SCUBA core 47- 52 F6.3 Jy Flux SCUBA Flux at 850um in Jy/beam 54- 56 A3 --- n_Flux [ABC- ] Code for type of sources (2) 58-101 A44 --- XID Common identifiers from Simbad 102-103 A2 --- Rem [*g ] Remarks on source (3)
Note (1): Position of Spitzer source from c2d catalog. Note (2): Code indicating whether the given source obeys: A = MIPS 24um source with [3.6]-[4.5]>1 and [8.0]-[24]>4.5; B = separation between Spitzer source and nearest SCUBA core less than 15"; C = Associated submillimeter core has concentration higher than 0.6. A- = SCUBA flux refers to flux density at the exact position in the maps; for the remaining sources to the peak flux from the Clumpfind algorithm. Note that only A and B are used to construct this sample. Note (3): Flag as follows: * = Sources are included in the list of embedded YSOs by Wilking et al. ( g = A complex system of at least three protostellar candidates: in addition to GSS 30-IRS1 a nearby source is seen at 16:26:22.38-24:22:52.9 at a distance of 10.4" from the SCUBA core: [AMD2002] J162622-242254/ VSSG 12/ISO-Oph 34/GSS 30-IRS2. A third source, GSS 30-IRS3/LFAM 1*, is at 16:26:21.72-24:22:50.5, separated by 4.5" and with [3.6]-[4.5]=0.9 and [8.0]-[24]=5.3 (although with low S/N in MIPS1 due to confusion with GSS 30-IRS1).
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name SMM designation (HHMMSS-DDMMm, J2000) 14- 15 I2 h RAh Hour of right ascension (J2000) (1) 17- 18 I2 min RAm Minute of right ascension (J2000) (1) 20- 23 F4.1 s RAs Second of right ascension (J2000) (1) 25 A1 --- DE- Declination sign (J2000) (1) 26- 27 I2 deg DEd Degree of declination (J2000) (1) 29- 30 I2 arcmin DEm Arcminute of declination (J2000) (1) 32- 35 F4.1 arcsec DEs Arcsecond of declination (J2000) (1) 37- 41 F5.2 Jy F850 SCUBA peak flux at 850um in Jy/beam (2) 43- 47 F5.2 Jy S850 SCUBA total flux at 850um (2) 49- 51 I3 arcsec Reff Outer radius (2) 53- 56 F4.2 solMass Mass Estimated mass (3) 58- 61 F4.2 --- Conc Concentration (4) 63- 64 I2 K Temp Temperature (4) 66- 69 F4.2 solMass MBE BE sphere mass (4) 71- 73 F3.1 cm-3 logn Central number density (4) 75- 77 F3.1 cm-3/K logP/k External pressure (4)
Note (1): Position of peak flux within clump (accurate to 3"; the pixel size in the SCUBA maps and the approximate pointing accuracy of the JCMT). Note (2): Peak flux, total flux, and outer radius derived from Clumpfind (Williams, de Geus, & Blitz, 1994, Cat. J/ApJ/428/693). The peak and total fluxes have uncertainties of about 20%, mostly due to uncertainties in the absolute flux calibration. The radius has not been deconvolved from the telescope beam. Note (3): Mass derived from the total flux assuming Td=15K and 850cm2/g, d=125pc. Note (4): Concentration, temperature, mass, central number density, and external pressure derived from Bonnor-Ebert (BE) modeling (see text).
Nomenclature Notes: For tables 1, 3, 4: objects are <[JJK2008]> in Simbad. For table 7: objects are <[JJK2008] SMM JHHMMSS+DDMMm> in Simbad. History: From electronic version of the journal References: Jorgensen et al. Paper I. 2007ApJ...656..293J
(End) Emmanuelle Perret [CDS] 01-Dec-2010
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