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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27812
Title: Seeds of Life in Space (SOLIS). III. Zooming Into the Methanol Peak of the Prestellar Core L1544
Authors: Punanova, Anna
Caselli, Paola
FENG, SIYI
Chacón-Tanarro, Ana
Ceccarelli, Cecilia
Neri, Roberto
FONTANI, FRANCESCO 
Jiménez-Serra, Izaskun
Vastel, Charlotte
Bizzocchi, Luca
Pon, Andy
Vasyunin, Anton I.
Spezzano, Silvia
Hily-Blant, Pierre
TESTI, Leonardo 
VITI, SERENA
Yamamoto, Satoshi
Alves, Felipe
Bachiller, Rafael
Balucani, Nadia
BIANCHI, ELEONORA
Bottinelli, Sandrine
Caux, Emmanuel
Choudhury, Rumpa
CODELLA, CLAUDIO 
Dulieu, François
Favre, Cécile
Holdship, Jonathan
Jaber Al-Edhari, Ali
Kahane, Claudine
Laas, Jake
LeFloch, Bertrand
López-Sepulcre, Ana
Ospina-Zamudio, Juan
Oya, Yoko
Pineda, Jaime E.
PODIO, LINDA 
Quenard, Davide
Rimola, Albert
Sakai, Nami
Sims, Ian R.
Taquet, Vianney
Theulé, Patrice
Ugliengo, Piero
Issue Date: 2018
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 855
Issue: 2
First Page: 112
Abstract: Toward the prestellar core L1544, the methanol (CH<SUB>3</SUB>OH) emission forms an asymmetric ring around the core center, where CH<SUB>3</SUB>OH is mostly in solid form, with a clear peak at 4000 au to the northeast of the dust continuum peak. As part of the NOEMA Large Project SOLIS (Seeds of Life in Space), the CH<SUB>3</SUB>OH peak has been spatially resolved to study its kinematics and physical structure and to investigate the cause behind the local enhancement. We find that methanol emission is distributed in a ridge parallel to the main axis of the dense core. The centroid velocity increases by about 0.2 km s<SUP>-1</SUP> and the velocity dispersion increases from subsonic to transonic toward the central zone of the core, where the velocity field also shows complex structure. This could be an indication of gentle accretion of material onto the core or the interaction of two filaments, producing a slow shock. We measure the rotational temperature and show that methanol is in local thermodynamic equilibrium (LTE) only close to the dust peak, where it is significantly depleted. The CH<SUB>3</SUB>OH column density, N <SUB>tot</SUB>(CH<SUB>3</SUB>OH), profile has been derived with non-LTE radiative transfer modeling and compared with chemical models of a static core. The measured N <SUB>tot</SUB>(CH<SUB>3</SUB>OH) profile is consistent with model predictions, but the total column densities are one order of magnitude lower than those predicted by models, suggesting that the efficiency of reactive desorption or atomic hydrogen tunneling adopted in the model may be overestimated; or that an evolutionary model is needed to better reproduce methanol abundance. <P />This work is based on observations carried out under project number L15AA with the IRAM NOEMA Interferometer and on observations carried out with the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
URI: http://hdl.handle.net/20.500.12386/27812
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aaad09
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aaad09
Bibcode ADS: 2018ApJ...855..112P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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