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Tracing micron-sized grains in molecular clouds with coreshine

Steinacker, Juügen and Andersen, Morten and Thi, Wing-Fai and Bacmann, Aurore and Pagani, Laurent and Ormel, Chris and Paladini, Roberta (2013) Tracing micron-sized grains in molecular clouds with coreshine. In: The Life Cycle of Dust in the Universe: Observations, Theory, and Laboratory Experiments. Proceedings of Science. No.207. SISSA , Trieste, Italy, Art. No. 115.

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Recently discovered scattered light at 3-5 µm from low-mass cores (so-called "coreshine") reveals the presence of grains around 1 µm. But only a fraction of the cores investigated so far show the effect. We derive a simple limit for detecting scattered light from a low-mass core can be derived. The extinction by the core prohibits detection in bright parts of the Galactic plane, the phase function favors the off-plane detection near the Galactic center and to some extent near the Galactic anti-center. Our 3D radiative transfer calculations for the core L260 show that also the K band is capable of probing coreshine, and that the shape of the Ks band surface brightness profile limits the largest grains to sizes of to 1-1.5 µm. For the core L1506C showing coreshine and strong depletion, but low density and turbulence our grain growth calculations and radiative transfer modeling show detectable coreshine at 3.6 µm only when we increase the core density and the turbulence above what is currently observed. The grains could be part of primitive omnipresent large grain population becoming visible in the densest part of the ISM, could have been grown under the turbulent dense conditions of former cores, or in L1506C itself. In the later case, L1506C must have passed through a period of larger density and/or stronger turbulence. This would be consistent with the surprisingly strong depletion usually attributed to high column densities, and with the large-scale outward motion of the core envelope observed today.

Item Type:Book Section
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Paladini, Roberta0000-0002-5158-243X
Alternate Title:Tracing grain growth from molecular clouds to disk envelopes with coreshine
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. JS, MA, and WFT acknowledge support from the ANR (SEED ANR-11-CHEX-0007-01). CWO acknowledges support for this work by NASA through Hubble Fellowship grant No. HST-HF51294.01-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)SEED ANR-11-CHEX-0007-01
NASA Hubble FellowshipHST-HF51294.01-A
NASANAS 5-26555
Series Name:Proceedings of Science
Issue or Number:207
Record Number:CaltechAUTHORS:20180828-122924570
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89229
Deposited By: George Porter
Deposited On:29 Aug 2018 20:23
Last Modified:03 Oct 2019 20:14

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