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  Droplets. I. Pressure-dominated coherent structures in L1688 and B18

Chen, H.-H.-H., Pineda, J. E., Goodman, A. A., Burkert, A., Offner, S. S. R., Friesen, R. K., et al. (2019). Droplets. I. Pressure-dominated coherent structures in L1688 and B18. The Astrophysical Journal, 877(2): 93. doi:10.3847/1538-4357/ab1a40.

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Droplets. I. Pressure-dominated Coherent Structures in L1688 and B18.pdf (beliebiger Volltext), 12MB
 
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 Urheber:
Chen, Hope How-Huan, Autor
Pineda, Jaime E.1, Autor           
Goodman, Alyssa A., Autor
Burkert, Andreas, Autor
Offner, Stella S. R., Autor
Friesen, Rachel K., Autor
Myers, Philip C., Autor
Alves, Felipe1, Autor           
Arce, Héctor G., Autor
Caselli, Paola1, Autor           
Chacón-Tanarro, Ana1, Autor           
Chen, Michael Chun-Yuan, Autor
Francesco, James Di, Autor
Ginsburg, Adam, Autor
Keown, Jared, Autor
Kirk, Helen, Autor
Martin, Peter G., Autor
Matzner, Christopher, Autor
Punanova, Anna, Autor
Redaelli, Elena1, Autor           
Rosolowsky, Erik, AutorScibelli, Samantha, AutorSeo, Youngmin, AutorShirley, Yancy, AutorSingh, Ayushi, Autor mehr..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Zusammenfassung: We present the observation and analysis of newly discovered coherent structures in the L1688 region of Ophiuchus and the B18 region of Taurus. Using data from the Green Bank Ammonia Survey, we identify regions of high density and near-constant, almost-thermal velocity dispersion. We reveal 18 coherent structures are revealed, 12 in L1688 and 6 in B18, each of which shows a sharp "transition to coherence" in velocity dispersion around its periphery. The identification of these structures provides a chance to statistically study the coherent structures in molecular clouds. The identified coherent structures have a typical radius of 0.04 pc and a typical mass of 0.4 M, generally smaller than previously known coherent cores identified by Goodman et al., Caselli et al., and Pineda et al. We call these structures "droplets." We find that, unlike previously known coherent cores, these structures are not virially bound by self-gravity and are instead predominantly confined by ambient pressure. The droplets have density profiles shallower than a critical Bonnor–Ebert sphere, and they have a velocity (V LSR) distribution consistent with the dense gas motions traced by NH3 emission. These results point to a potential formation mechanism through pressure compression and turbulent processes in the dense gas. We present a comparison with a magnetohydrodynamic simulation of a star-forming region, and we speculate on the relationship of droplets with larger, gravitationally bound coherent cores, as well as on the role that droplets and other coherent structures play in the star formation process.

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 Datum: 2019-05-29
 Publikationsstatus: Online veröffentlicht
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 Identifikatoren: DOI: 10.3847/1538-4357/ab1a40
Anderer: LOCALID: 3072988
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Titel: The Astrophysical Journal
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Bristol, England : IOP Publishing LTD
Seiten: - Band / Heft: 877 (2) Artikelnummer: 93 Start- / Endseite: - Identifikator: ISSN: 1538-4357
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3