CEPHEUS-A HW2 - A POWERFUL THERMAL RADIO JET

DOI: 
10.1086/187439
Publication date: 
20/07/1994
Main author: 
RODRIGUEZ, LF
IAA authors: 
Authors: 
RODRIGUEZ, LF; GARAY, G; CURIEL, S; RAMIREZ, S; TORRELLES, JM; GOMEZ, Y; VELAZQUEZ, A
Journal: 
ASTROPHYSICAL JOURNAL
Refereed: 
Yes
Publication type: 
Article
Volume: 
430
Pages: 
L65-L68
Number: 
Abstract: 
At angular resolution of approximately 1'' the Cepheus A East radio source is known to consist of 16 compact components clustered within a 25'' radius region, most of which are aligned in stringlike structures. We present multifrequency VLA radio continuum observations of Cep A HW2, the elongated radio object believed to be associated with the most luminous (approximately 10(4) L.) source in the region. In the frequency range from 1.5 to 43 GHz, we find that its flux density increases with frequency as nu0.69, while the angular size of its major axis decreases with frequency as nu-0.57. The above frequency dependences are very close to the theoretical values of nu0.6 and nu-0.7 expected for a biconical thermal jet and make Cep A HW2 the best example known of this type of object. We suggest that Cep A HW2 is responsible for at least part of the complex outflow and excitation phenomena observed in the region. The estimated ionized mass-loss rate in this source, approximately 8 x 10(-7) M. yr-1, is about 100 times larger than the value expected for a star of the same luminosity in the main sequence.
Database: 
WOK
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/1994ApJ...430L..65R/abstract
ADS Bibcode: 
1994ApJ...430L..65R
Keywords: 
H-II REGIONS; ISM, INDIVIDUAL (CEPHEUS A); ISM, JETS AND OUTFLOWS; RADIO CONTINUUM, STARS; STARS, FORMATION; STARS, PRE-MAIN-SEQUENCE