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J/ApJ/852/102   Herschel nearby isolated low-mass clouds maps  (Sadavoy+, 2018)

Intensity-corrected Herschel observations of nearby isolated low-mass clouds. Sadavoy S.I., Keto E., Bourke T.L., Dunham M.M., Myers P.C., Stephens I.W., Di Francesco J., Webb K., Stutz A.M., Launhardt R., Tobin J.J. <Astrophys. J., 852, 102-102 (2018)> =2018ApJ...852..102S (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Spectra, millimetric/submm Keywords: dust, extinction - ISM: clouds - ISM: structure - stars: formation - submillimeter: ISM Abstract: We present intensity-corrected Herschel maps at 100, 160, 250, 350, and 500µm for 56 isolated low-mass clouds. We determine the zero-point corrections for Herschel Photodetector Array Camera and Spectrometer (PACS) and Spectral Photometric Imaging Receiver (SPIRE) maps from the Herschel Science Archive (HSA) using Planck data. Since these HSA maps are small, we cannot correct them using typical methods. Here we introduce a technique to measure the zero-point corrections for small Herschel maps. We use radial profiles to identify offsets between the observed HSA intensities and the expected intensities from Planck. Most clouds have reliable offset measurements with this technique. In addition, we find that roughly half of the clouds have underestimated HSA-SPIRE intensities in their outer envelopes relative to Planck, even though the HSA-SPIRE maps were previously zero-point corrected. Using our technique, we produce corrected Herschel intensity maps for all 56 clouds and determine their line-of-sight average dust temperatures and optical depths from modified blackbody fits. The clouds have typical temperatures of ∼14-20K and optical depths of ∼10-5-10-3. Across the whole sample, we find an anticorrelation between temperature and optical depth. We also find lower temperatures than what was measured in previous Herschel studies, which subtracted out a background level from their intensity maps to circumvent the zero-point correction. Accurate Herschel observations of clouds are key to obtaining accurate density and temperature profiles. To make such future analyses possible, intensity-corrected maps for all 56 clouds are publicly available in the electronic version. Description: For all the sources listed in table1, maps of dust temperature and optical depth at 353GHz for all globules as fits files. For all the sources listed in table1, maps of dust temperature, optical depth at 353GHz, and corrected Herschel intensities are available as fits files. The intensity maps contain labels to indicate the reliability of their intensity corrections with Group A as the most reliable, Group B as somewhat reliable, and Group C as least reliable. See paper for details. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 93 56 Nearby Globules in the Herschel Archive refs.dat 173 25 References and method used fits/* 0 504 Individual dust temperature, optical depth and intensity-corrected maps
See also: VI/139 : Herschel Observation Log (Herschel Science Centre, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Globule name 12 A1 --- n_Name [a] Note on Name (1) 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 23 F4.1 s RAs Right ascension (J2000) 25 A1 --- DE- Decliniation sign (J2000) 26- 27 I2 deg DEd Decliniation (J2000) 29- 30 I2 arcmin DEm Decliniation (J2000) 32- 33 I2 arcsec DEs Decliniation (J2000) 35- 48 A14 --- PropID Proposal ID 51- 67 A17 --- Assoc Association 69- 71 I3 pc Dist Distance, or lower value of interval of distance 72 A1 --- --- [-] 73- 75 I3 pc Dist2 ? Upper value of interval of distance 77- 79 I3 pc e_Dist ? rms uncertainty on Dist 81- 85 A5 --- Ref References, in refs.dat file 87- 93 A7 --- fname Name used in fits files (2)
Note (1): a: We assume the same distance as CB 175, but we caution that CB 175 and CB 176 have different gas velocities and may not be related. CB 176 has a velocity of ~=16km/s, whereas CB 175 is at ~=10km/s (Clemens et al., 1991ApJS...75..877C). Note (2): Name used in fits files in subdirectory fits: optical depth maps: fname_tau.fits, fnametauerror.fits, dust temperature maps: fname_temperature.fits, fnametemperatureerror.fits. intensity-corrected maps: fnamepacs100intensitycorrectedgradeN.fits, fnameintensitycorrected_gradeN.fits, fnamespire250intensitycorrectedgradeN.fits, fnamespire350intensitycorrectedgradeN.fits, fnamespire500intensitycorrectedgradeN.fits where N could be A, B or C
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 44 A21 --- Auth Author's name 46- 66 A21 -- Com Comments 68-173 A106 --- Meth Measurement method used
History: From electronic version of the journal and Sarah Sadavoy, sarah.sadavoy(at)
(End) Patricia Vannier [CDS] 28-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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