Analysis and test of the central-blue-spot infall hallmark

DOI: 
10.1051/0004-6361/201834998
Publication date: 
01/06/2019
Main author: 
Estalella, R.
IAA authors: 
Anglada, G.;Díaz-Rodríguez, A. K.;Mayen-Gijon, J. M.
Authors: 
Estalella, R.;Anglada, G.;Díaz-Rodríguez, A. K.;Mayen-Gijon, J. M.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
626
Pages: 
A84
Abstract: 
<BR /> 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. <BR /> 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. <BR /> 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<SUB>☉</SUB>; B335: 0.1 M<SUB>☉</SUB>; Guitar Core of LDN 1287: 4.8 M<SUB>☉</SUB>). The central-blue-spot infall hallmark appears to be a robust and reliable indicator of infall.
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082528317&doi=10.1051%2f0004-6361%2f201834998&partnerID=40&md5=97f7d921f11bec0993d09eac4d16a808
ADS Bibcode: 
2019A&A...626A..84E
Keywords: 
ISM: jets and outflows;ISM: individual objects: G31.41+0.31 HMC;ISM: individual objects: B335;stars: formation;ISM: individual objects: LDN 1287;Astrophysics - Solar and Stellar Astrophysics;Astrophysics - Astrophysics of Galaxies