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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/20.500.12386/29193
Title: The Central 1000 au of a Pre-stellar Core Revealed with ALMA. I. 1.3 mm Continuum Observations
Authors: Caselli, Paola
Pineda, Jaime E.
Zhao, Bo
Walmsley, Malcolm C.
Keto, Eric
Tafalla, Mario
Chacón-Tanarro, Ana
Bourke, Tyler L.
Friesen, Rachel
GALLI, Daniele 
Padovani, Marco 
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 874
Issue: 1
First Page: 89
Abstract: Stars like our Sun form in self-gravitating dense and cold structures within interstellar clouds that are referred to as pre-stellar cores. Although much is known about the physical structure of dense clouds just before and soon after the switch-on of a protostar, the central few thousand astronomical units (au) of pre-stellar cores are unexplored. It is within these central regions that stellar systems assemble and fragmentation may take place, with the consequent formation of binaries and multiple systems. We present Atacama Large Millimetre and submillimetre Array (ALMA) Band 6 observations (Atacama Compact Array and 12 m array) of the dust continuum emission of the 8 M☉ pre-stellar core L1544, with an angular resolution of 2″ × 1.″6 (linear resolution 270 au × 216 au). Within the primary beam, a compact region of 0.1 M☉, which we call a “kernel,” has been unveiled. The kernel is elongated, with a central flat zone with radius R_ker ≃ 10″ (≃1400 au). The average number density within R_ker is ≃1 × 10^6 cm^-3, with possible local density enhancements. The region within R_ker appears to have fragmented, but detailed analysis shows that similar substructure can be reproduced by synthetic interferometric observations of a smooth centrally concentrated dense core with a similar central flat zone. The presence of a smooth kernel within a dense core is in agreement with non-ideal magnetohydro-dynamical simulations of a contracting cloud core with a peak number density of 1 × 10^7 cm^-3. Dense cores with lower central densities are completely filtered out when simulated 12 m array observations are carried out. These observations demonstrate that the kernel of dynamically evolved dense cores can be investigated at high angular resolution with ALMA.
URI: http://hdl.handle.net/20.500.12386/29193
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab0700
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab0700
Bibcode ADS: 2019ApJ...874...89C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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