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  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., et al. (2018). Intensity-corrected Herschel Observations of Nearby Isolated Low-mass Clouds. The Astrophysical Journal, 852.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CB5A-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CB5B-1
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018ApJ...852..102S (Any fulltext)
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 Creators:
Sadavoy, Sarah I.1, Author
Keto, Eric1, Author
Bourke, Tyler L.1, Author
Dunham, Michael M.1, Author
Myers, Philip C.1, Author
Stephens, Ian W.1, Author
Di Francesco, James1, Author
Webb, Kristi1, Author
Stutz, Amelia M.1, Author
Launhardt, Ralf1, Author
Tobin, John J.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: dust extinction ISM: clouds ISM: structure stars: formation submillimeter: ISM Astrophysics - Astrophysics of Galaxies
 Abstract: We present intensity-corrected Herschel maps at 100, 160, 250, 350, and 500 μm 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 ̃14-20 K 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. Herschel is an ESA space observatory with science instruments provided by European- led Principal Investigator consortia and with important participation from NASA.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 852 Sequence Number: - Start / End Page: - Identifier: -