A systematic survey of millimetre-wavelength flaring variability of young stellar objects in the Orion Nebula Cluster

Autor(en): J. Vargas-González, J. Forbrich, V. M. Rivilla, K. M. Menten, M. Güdel, A. Hacar
Abstrakt: High-energy processes are ubiquitous even in the earliest stages of protostellar evolution. Motivated by the results of our systematic search for intense centimetre radio flares in Young Stellar Objects (YSOs) and by rare findings of strong millimetre-wavelength variability, we have conducted a systematic search for such variability in the Orion Nebula Cluster (ONC) using Atacama Large Millimetre/submillimetre Array (ALMA). Rapid variability on time-scales of minutes to hours in the (centimetre) millimetre-wavelength range indicates (gyro)synchrotron radiation. Additionally, mass accretion will also affect the millimetre-wavelength luminosity but typically on longer time-scales. Beyond studies of individual YSOs, our characterization of strong millimetre-wavelength variability with ALMA in the ONC sets first systematic constraints on the occurrence of such variability in a large number of YSOs (∼130). We report the discovery of an order of magnitude millimetre-flare within just a few minutes from a known YSO previously reported as a radio flaring source at cm-wavelengths (the ‘ORBS’ source). We also present an assessment of the systematic variability effects caused by the use of time-sliced imaging of a complex region. These are mostly due to the impact of a changing synthesized beam throughout the observations. We use simulated ALMA observations to reproduce and quantify these effects, and set a lower limit for the variability that can be studied using our method in a complex region such as the ONC. Our results demonstrate that the utility of time domain analysis of YSOs extends into the millimetre-wavelength range, potentially interfering with the conversion of observed fluxes into dust masses.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): University of Hertfordshire, Harvard-Smithsonian Center for Astrophysics, Centro de Astrobiología (CSIC-INTA), Max-Planck-Institut für Radioastronomie, European Southern Observatory (Chile)
Journal: Monthly Notices of the Royal Astronomical Society
Band: 522
Seiten: 56-69
Anzahl der Seiten: 14
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stad926
Publikationsdatum: 06-2023
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/3ab56aa3-cee2-4e98-b42b-d92c1a2dff3c

Zurück