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Seeds of Life in Space (SOLIS). III. Zooming Into the Methanol Peak of the Prestellar Core L1544

Anna Punanova, Paola Caselli, Siyi Feng, Ana Chacón-Tanarro, Cecilia Ceccarelli, Roberto Neri, Francesco Fontani, Izaskun Jiménez-Serra, Charlotte Vastel, Luca Bizzocchi, Andy Pon, Anton I. Vasyunin (+32 others)
2018 Astrophysical Journal  

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2018 pre-print
arXiv:1802.00859v1 fatcat:ryz7s7ee5jerpd5t6rago75idm
Towards the pre-stellar core L1544, the methanol (CH_3OH) emission forms an asymmetric ring around the core centre, where CH_3OH is mostly in solid form, with a clear peak 4000 au to the north-east of the dust continuum peak. As part of the NOEMA Large Project SOLIS (Seeds of Life in Space), the CH_3OH 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
more » ... parallel to the main axis of the dense core. The centroid velocity increases by about 0.2 km s^-1 and the velocity dispersion increases from subsonic to transonic towards the central zone of the core, where the velocity field also shows complex structure. This could be indication of gentle accretion of material onto the core or 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_3OH column density, N_tot( CH_3OH), profile has been derived with non-LTE radiative transfer modelling and compared with chemical models of a static core. The measured N_tot( CH_3OH) 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 tunnelling adopted in the model may be overestimated; or that an evolutionary model is needed to better reproduce methanol abundance.
doi:10.3847/1538-4357/aaad09 fatcat:vqopb4x7g5ep5foeharazy7kme
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Anna Punanova, Paola Caselli, Siyi Feng, Ana Chacón-Tanarro, Cecilia Ceccarelli, Roberto Neri, Francesco Fontani, Izaskun Jiménez-Serra, Charlotte Vastel, Luca Bizzocchi, Andy Pon, Anton I. Vasyunin, Silvia Spezzano, Pierre Hily-Blant, Leonardo Testi, Serena Viti, Satoshi Yamamoto, Felipe Alves, Rafael Bachiller, Nadia Balucani, Eleonora Bianchi, Sandrine Bottinelli, Emmanuel Caux, Rumpa Choudhury, Claudio Codella, François Dulieu, Cécile Favre, Jonathan Holdship, Ali Jaber Al-Edhari, Claudine Kahane, Jake Laas, Bertrand LeFloch, Ana López-Sepulcre, Juan Ospina-Zamudio, Yoko Oya, Jaime E. Pineda, Linda Podio, Davide Quenard, Albert Rimola, Nami Sakai, Ian R. Sims, Vianney Taquet, Patrice Theulé, Piero Ugliengo. "Seeds of Life in Space (SOLIS). III. Zooming Into the Methanol Peak of the Prestellar Core L1544." Astrophysical Journal 855.2 (2018) 112