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J/MNRAS/463/1008    LDN 1495 SCUBA-2 and Herschel data    (Ward-Thompson+, 2016)

The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495. Ward-thompson D., Pattle K., Kirk J.M., Marsh K., Buckle J., Hatchell J., Nutter D.J., Griffin M.J., Di Francesco J., Andre P., Beaulieu S., Berry D., Broekhoven-Fiene H., Currie M., Fich M., Jenness T., Johnstone D., Kirk H., Mottram J., Pineda J., Quinn C., Sadavoy S., Salji C., Tisi S., Walker-Smith S., White G., Hill T., Konyves V., Palmeirim P., Pezzuto S. <Mon. Not. R. Astron. Soc., 463, 1008-1025 (2016)> =2016MNRAS.463.1008W (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Photometry, millimetric/submm Keywords: stars: formation; ISM: clouds - ISM: Individual objects: Taurus and L1495 Abstract: We present a comparison of Submillimetre Common User Bolometer Array-2 (SCUBA-2) 850-µm and Herschel 70-500-µm observations of the L1495 filament in the Taurus Molecular Cloud with the goal of characterizing the SCUBA-2 Gould Belt Survey (GBS) data set. We identify and characterize starless cores in three data sets: SCUBA-2 850-µm, Herschel 250-µm, and Herschel 250-µm spatially filtered to mimic the SCUBA-2 data. SCUBA-2 detects only the highest-surface-brightness sources, principally detecting protostellar sources and starless cores embedded in filaments, while Herschel is sensitive to most of the cloud structure, including extended low-surface-brightness emission. Herschel detects considerably more sources than SCUBA-2 even after spatial filtering. We investigate which properties of a starless core detected by Herschel determine its detectability by SCUBA-2, and find that they are the core's temperature and column density (for given dust properties). For similar-temperature cores, such as those seen in L1495, the surface brightnesses of the cores are determined by their column densities, with the highest-column-density cores being detected by SCUBA-2. For roughly spherical geometries, column density corresponds to volume density, and so SCUBA-2 selects the densest cores from a population at a given temperature. This selection effect, which we quantify as a function of distance, makes SCUBA-2 ideal for identifying those cores in Herschel catalogues that are closest to forming stars. Our results can now be used by anyone wishing to use the SCUBA-2 GBS data set. Description: The L1495 region of the Taurus molecular cloud was observed with the SCUBA-2 camera in 22 observations taken between October 2011 and July 2013. The comparison Herschel data used in this paper were taken as part of the Herschel Gould Belt Survey (Andre et al. 2010A&A...518L.102A) and were presented by Marsh et al. (2016MNRAS.459..342M, Cat. J/MNRAS/459/342). They were taken simultaneously with the Photodetector Array Camera and Spectrometer, PACS and the Spectral and Photometric Imaging Receiver, SPIRE using the combined fast-scanning (60 arcsec/s) SPIRE/PACS parallel mode. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 25 Sources found by the CSAR algorithm in its non-hierarchical mode in the 850-um SCUBA-2 data table2.dat 44 25 Derived properties of the sources found by SCUBA-2 in the L1495 region tablea1.dat 80 208 CSAR output for Herschel sources tablea2.dat 80 138 CSAR output for filtered-Herschel sources tablea3.dat 44 208 Derived properties of Herschel sources tablea4.dat 44 138 Derived properties of filtered-Herschel sources tableb1.dat 52 42 Sources detected in increased-noise filtered Herschel 250-um data
See also: J/A+A/574/A104 : Dense cores in L1495/B213 complex (Tafalla+, 2015) J/MNRAS/459/342 : Dense cores in Taurus L1495 cloud (Marsh+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Source Source designation (SNN) (1) 5 I1 h RAh Rigth ascension (J2000) 7- 8 I2 min RAm Rigth ascension (J2000) 10- 14 F5.2 s RAs Rigth ascension (J2000) 16 A1 --- DE- Declination sign (J2000) 17- 18 I2 deg DEd Declination (J2000) 20- 21 I2 arcmin DEm Declination (J2000) 23- 26 F4.1 arcsec DEs Declination (J2000) 28- 31 F4.1 arcsec FWHM1 Size 32 A1 --- --- [x] 33- 36 F4.1 arcsec FWHM2 Size 38- 42 F5.1 deg Angle Position angle (E of N) 44- 48 F5.2 Jy F160 Total 160um flux 50- 54 F5.2 Jy F250 Total 250um flux 56- 60 F5.2 Jy F350 Total 350um flux 62- 66 F5.2 Jy F500 Total 500um flux 68- 71 F4.2 Jy F850 Total 850um flux 73- 75 A3 --- CtpH Herschel counterpart source 76 A1 --- --- [,] 78- 80 A3 --- CtpF Filtered-Herschel counterpart source
Note (1): Sources labelled 'S', listed in this table, are detected in SCUBA-2 850um emission.
Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Source Source designation (HNNN for tablea1, FNN for tablea2) 6 I1 h RAh Rigth ascension (J2000) 8- 9 I2 min RAm Rigth ascension (J2000) 11- 15 F5.2 s RAs Rigth ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 27 F4.1 arcsec DEs Declination (J2000) 29- 33 F5.1 arcsec FWHM1 Size 34 A1 --- --- [x] 35- 38 F4.1 arcsec FWHM2 Size 40- 44 F5.1 deg Angle Position angle (E of N) 46- 50 F5.2 Jy F160 Total 160um flux 52- 56 F5.2 Jy F250 Total 250um flux 58- 62 F5.2 Jy F350 Total 350um flux 64- 68 F5.2 Jy F500 Total 500um flux 70 A1 --- --- [(] 71- 74 F4.2 Jy F850 Extrapolate total 850um flux 75 A1 --- --- [)] 77- 80 A4 --- Ctp ? Counterpart Marsh (tablea1, NNN) or Herschel (tablea2, HNN) source (1)
Note (1): in tablea1, counterpart sources in Marsh et al., 2016, Cat. J/MNRAS/459/342, [MKA2016] NNN in Simbad.
Byte-by-byte Description of file: table2.dat tablea3.dat tablea4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Source Source designation (SNN for table2, HNNN for tablea3, FNNN for tablea4) 6- 10 F5.1 K T Temperature 12- 14 F3.1 K e_T rms uncertainty on temperature 16- 20 F5.3 Msun Mass Mass 22- 26 F5.3 Msun e_Mass rms uncertainty on mass 28- 32 F5.2 10+4cm3 Dens Density 34- 38 F5.2 10+4cm3 e_Dens rms uncertainty on density 40- 44 F5.3 pc Deconv Deconvoled FWHM
Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Source Source designation (Nnn) 6 I1 h RAh Rigth ascension (J2000) 8- 9 I2 min RAm Rigth ascension (J2000) 11- 15 F5.2 s RAs Rigth ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 27 F4.1 arcsec DEs Declination (J2000) 29- 32 F4.1 arcsec FWHM1 Size 33 A1 --- --- [x] 34- 37 F4.1 arcsec FWHM2 Size 39- 43 F5.1 deg Angle Position angle (E of N) 45- 47 A3 --- CtpS SCUBA-2 850um emission detected counterpart source 48 A1 --- --- [,] 50- 52 A3 --- CtpF Filtered-Herschel counterpart source
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 02-May-2018
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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