Herschel nearby isolated low-mass clouds maps Virtual Observatory Resource

Authors
  1. Sadavoy S.I.
  2. Keto E.
  3. Bourke T.L.
  4. Dunham M.M.
  5. Myers P.C.
  6. Stephens I.W.,Di Francesco J.
  7. Webb K.
  8. Stutz A.M.
  9. Launhardt R.
  10. Tobin J.J.
  11. Published by
    CDS
Abstract

We present intensity-corrected Herschel maps at 100, 160, 250, 350, and 500{mu}m 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.

Keywords
  1. molecular-clouds
  2. radio-spectroscopy
Bibliographic source Bibcode
2018ApJ...852..102S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/852/102
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/852/102
Document Object Identifer DOI
doi:10.26093/cds/vizier.18520102

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History

2018-05-29T10:43:44Z
Resource record created
2018-05-29T10:43:44Z
Created
2018-06-21T06:10:11Z
Updated

Contact

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CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr