%0 Generic %1 molet2019molecular %A Molet, J. %A Brouillet, N. %A Nony, T. %A Gusdorf, A. %A Motte, F. %A Despois, D. %A Louvet, F. %A Bontemps, S. %A Herpin, F. %D 2019 %K SFR core %R 10.1051/0004-6361/201935497 %T Molecular analysis of a high-mass prestellar core candidate in W43-MM1 %U http://arxiv.org/abs/1905.12463 %X High-mass analogues of low-mass prestellar cores are searched for to constrain the models of high-mass star formation. Several high-mass cores, at various evolutionary stages, have been recently identified towards the massive star-forming region W43-MM1 and amongst them a high-mass prestellar core candidate. We aim to characterise the chemistry in this high-mass prestellar core candidate, referred to as W43-MM1 core #6, and its environment. Using ALMA high-spatial resolution data of W43-MM1, we have studied the molecular content of core #6 and a neighbouring high-mass protostellar core, referred to as #3, which is similar in size and mass to core #6. We first subtracted the continuum emission using a method based on the density distribution of the intensities on each pixel. Then, from the distribution of detected molecules, we identified the molecules centred on the prestellar core candidate (core #6) and those associated to shocks related to outflows and filament formation. Then we constrained the column densities and temperatures of the molecules detected towards the two cores. While core #3 appears to contain a hot core with a temperature of about 190 K, core #6 seems to have a lower temperature in the range from 20 K to 90 K from a rotational diagram analysis. We have considered different source sizes for core #6 and the comparison of the abundances of the detected molecules towards the core with various interstellar sources shows that it is compatible with a core of size 1000 au with $T = 20-90$ K or a core of size 500 au with $T 80$ K. Core #6 of W43-MM1 remains one of the best high-mass prestellar core candidates even if we cannot exclude that it is at the very beginning of the protostellar phase of high-mass star formation.

@misc{molet2019molecular, abstract = {High-mass analogues of low-mass prestellar cores are searched for to constrain the models of high-mass star formation. Several high-mass cores, at various evolutionary stages, have been recently identified towards the massive star-forming region W43-MM1 and amongst them a high-mass prestellar core candidate. We aim to characterise the chemistry in this high-mass prestellar core candidate, referred to as W43-MM1 core #6, and its environment. Using ALMA high-spatial resolution data of W43-MM1, we have studied the molecular content of core #6 and a neighbouring high-mass protostellar core, referred to as #3, which is similar in size and mass to core #6. We first subtracted the continuum emission using a method based on the density distribution of the intensities on each pixel. Then, from the distribution of detected molecules, we identified the molecules centred on the prestellar core candidate (core #6) and those associated to shocks related to outflows and filament formation. Then we constrained the column densities and temperatures of the molecules detected towards the two cores. While core #3 appears to contain a hot core with a temperature of about 190 K, core #6 seems to have a lower temperature in the range from 20 K to 90 K from a rotational diagram analysis. We have considered different source sizes for core #6 and the comparison of the abundances of the detected molecules towards the core with various interstellar sources shows that it is compatible with a core of size 1000 au with $T = 20-90$ K or a core of size 500 au with $T \sim 80$ K. Core #6 of W43-MM1 remains one of the best high-mass prestellar core candidates even if we cannot exclude that it is at the very beginning of the protostellar phase of high-mass star formation.}, added-at = {2019-05-30T16:09:18.000+0200}, author = {Molet, J. and Brouillet, N. and Nony, T. and Gusdorf, A. and Motte, F. and Despois, D. and Louvet, F. and Bontemps, S. and Herpin, F.}, biburl = {https://www.bibsonomy.org/bibtex/225f950c8bd08806f13167d8da948e394/heh15}, description = {Molecular analysis of a high-mass prestellar core candidate in W43-MM1}, doi = {10.1051/0004-6361/201935497}, interhash = {fbc4d98b8c092c373cebe6a7041024b6}, intrahash = {25f950c8bd08806f13167d8da948e394}, keywords = {SFR core}, note = {cite arxiv:1905.12463Comment: 18 pages, 8 figures, Accepted for publication in Astronomy & Astrophysics}, timestamp = {2019-05-30T16:09:18.000+0200}, title = {Molecular analysis of a high-mass prestellar core candidate in W43-MM1}, url = {http://arxiv.org/abs/1905.12463}, year = 2019 }