ALMA observations of envelopes around first hydrostatic core candidates
Author
dc.contributor.author
Maureira, María José
Author
dc.contributor.author
Arce, Héctor G.
Author
dc.contributor.author
Dunham, Michael M.
Author
dc.contributor.author
Mardones Pérez, Diego
Author
dc.contributor.author
Guzmán, Andrés E.
Author
dc.contributor.author
Pineda, Jaime E.
Author
dc.contributor.author
Bourke, Tyler L.
Admission date
dc.date.accessioned
2021-06-09T19:13:09Z
Available date
dc.date.available
2021-06-09T19:13:09Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
MNRAS 499, 4394–4417 (2020)
es_ES
Identifier
dc.identifier.other
10.1093/mnras/staa2894
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/180058
Abstract
dc.description.abstract
We present ALMA3 mm molecular line and continuum observations with a resolution of similar to 3.5 arcsec towards five first hydrostatic core (FHSC) candidates (L1451-mm, Per-bolo 58, Per-bolo 45, L1448-IRS2E, and Cha-MMS1). Our goal is to characterize their envelopes and identify the most promising sources that could be bona fide FHSCs. We identify two candidates that are consistent with an extremely young evolutionary state (L1451-mm and Cha-MMS1), with L1451-mm being the most promising FHSC candidate. Although our envelope observations cannot rule out Cha-MMS1 as an FHSC yet, the properties of its CO outflow and SED published in recent studies are in better agreement with the predictions for a young protostar. For the remaining three sources, our observations favour a pre-stellar nature for Per-bolo 45 and rule out the rest as FHSC candidates. Per-bolo 58 is fully consistent with being a Class 0, while L1448 IRS2E shows no emission of high-density tracers (NH2D and N2H+) at the location of the previously identified compact continuum source, which is also undetected in our observations. Thus, we argue that there is no embedded source at the presumptive location of the FHSC candidate L1448 IRS2E. We propose instead that what was thought to be emission from the presumed L1448 IRS2E outflow corresponds to outflow emission from a nearby Class 0 system, deflected by the dense ambient material. We compare the properties of the FHSC candidates studied in this work and the literature, which shows that L1451-mm appears as possibly the youngest source with a confirmed outflow.
es_ES
Patrocinador
dc.description.sponsorship
National Science Foundation (NSF)
AST-1714710
CONICYT project Basal
AFB-170002
Max Planck Society
Foundation CELLEX