An APEX search for carbon emission from NGC 1977 proplyds

• Verfasst von: Haworth, Thomas [VerfasserIn]
• Verfasst von: Kim, Jinyoung S [VerfasserIn]
• Verfasst von: Qiao, Lin [VerfasserIn]
• Verfasst von: Winter, Andrew J. [VerfasserIn]
• Verfasst von: Williams, Jonathan P [VerfasserIn]
• Verfasst von: Clarke, Cathie J [VerfasserIn]
• Verfasst von: Owen, James E [VerfasserIn]
• Verfasst von: Facchini, Stefano [VerfasserIn]
• Verfasst von: Ansdell, Megan [VerfasserIn]
• Verfasst von: Kama, Mikhel [VerfasserIn]
• Verfasst von: Ballabio, Giulia [VerfasserIn]
• Titel: An APEX search for carbon emission from NGC 1977 proplyds
• Verf.angabe: Thomas J. Haworth, Jinyoung S. Kim, Lin Qiao, Andrew J. Winter, Jonathan P. Williams, Cathie J. Clarke, James E. Owen, Stefano Facchini, Megan Ansdell, Mikhel Kama and Giulia Ballabio
• E-Jahr: 2022
• Jahr: 2022 March 14
• Umfang: 10 S.
• Fussnoten: Gesehen am 22.04.2022
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2022
• Band/Heft Quelle: 512(2022), 2, Seite 2594-2603
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stac656
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1799276074

Abstract

We used the Atacama Pathfinder Experiment (APEX) telescope to search for C I 1-0 (492.16 GHz) emission towards eight proplyds in NGC 1977, which is an FUV radiation environment two orders of magnitude weaker than that irradiating the Orion Nebular Cluster (ONC) proplyds. C I is expected to enable us to probe the wind launching region of externally photo-evaporating discs. Of the eight targets observed, no 3σ detections of the C I line were made despite reaching sensitivities deeper than the anticipated requirement for detection from prior APEX CI observations of nearby discs and models of external photo-evaporation of quite massive discs. By comparing both the proplyd mass loss rates and C I flux constraints with a large grid of external photo-evaporation simulations, we determine that the non-detections are in fact fully consistent with the models if the proplyd discs are very low mass. Deeper observations in C I and probes of the disc mass with other tracers (e.g. in the continuum and CO) can test this. If such a test finds higher masses, this would imply carbon depletion in the outer disc, as has been proposed for other discs with surprisingly low C I fluxes, though more massive discs would also be incompatible with models that can explain the observed mass loss rates and C I non-detections. The expected remaining lifetimes of the proplyds are estimated to be similar to those of proplyds in the ONC at 0.1 Myr. Rapid destruction of discs is therefore also a feature of common, intermediate UV environments.