Volume 626, June 2019
|Number of page(s)||20|
|Section||Interstellar and circumstellar matter|
|Published online||18 June 2019|
Analysis and test of the central-blue-spot infall hallmark
Departament de Física Quàntica i Astrofísica, Institut de Ciències del Cosmos, Universitat de Barcelona, IEEC-UB,
Martí i Franquès 1,
2 Instituto de Astrofísica de Andalucía, CSIC, Glorieta de la Astronomía, s/n, 18008 Granada, Spain
Accepted: 13 April 2019
Aims. The infall of material onto a protostar, in the case of optically thick line emission, produces an asymmetry in the blue- and red-wing line emissions. For an angularly resolved emission, this translates in a blue central spot in the first-order moment (intensity weighted velocity) map.
Methods. An analytical expression for the first-order moment intensity as a function of the projected distance was derived, for the cases of infinite and finite infall radius. The effect of a finite angular resolution, which requires the numerical convolution with the beam, was also studied.
Results. This method was applied to existing data of several star-forming regions, namely G31.41+0.31 HMC, B335, and LDN 1287, obtaining good fits to the first-order moment intensity maps, and deriving values of the central masses onto which the infall is taking place (G31.41+0.31 HMC: 70–120 M⊙; B335: 0.1 M⊙; Guitar Core of LDN 1287: 4.8 M⊙). The central-blue-spot infall hallmark appears to be a robust and reliable indicator of infall.
Key words: ISM: jets and outflows / ISM: individual objects: G31.41+0.31 HMC / ISM: individual objects: B335 / stars: formation / ISM: individual objects: LDN 1287
© ESO 2019
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.