2014ApJ...782L..28H


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:55:39

2014ApJ...782L..28H - Astrophys. J., 782, L28 (2014/February-3)

A hot molecular circumstellar disk around the massive protostar Orion source I.

HIROTA T., KIM M.K., KURONO Y. and HONMA M.

Abstract (from CDS):

We report new Atacama Large Millimeter/Submillimeter Array (ALMA) observations of a circumstellar disk around Source I in Orion KL, an archetype of massive protostar candidates. We detected two ortho-H2 O lines at 321 GHz (10_2, 9–93, 6_) and 336 GHz (ν2= 1, 5_2, 3–61, 6_) for the first time in Source I. The latter one is in a vibrationally excited state at the lower state energy of 2939 K, suggesting evidence of hot molecular gas close to Source I. The integrated intensity map of the 321 GHz line is elongated along the bipolar outflow while the 336 GHz line map is unresolved with a beam size of 0.''4. Both of these maps show velocity gradients perpendicular to the bipolar outflow. The velocity centroid map of the 321 GHz line implies a spatial and velocity structure similar to that of vibrationally excited SiO masers tracing the root of the outflow emanating from the disk surface. In contrast, the 336 GHz line is most likely emitting from the disk midplane with a diameter of 0.''2 (84 AU) as traced by radio continuum emission and a dark lane devoid of the vibrationally excited SiO maser emission. The observed velocity gradient and the spectral profile of the 336 GHz H2 O line can be reconciled with a model of an edge-on ring-like structure with an enclosed mass of >7 Mand an excitation temperature of >3000 K. The present results provide further evidence of a hot and neutral circumstellar disk rotating around Source I with a diameter of ∼100 AU scale.

Abstract Copyright:

Journal keyword(s): ISM: individual: Orion KL - ISM: molecules - radio lines: ISM - stars: individual: Source I

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1071 3
2 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 291 2
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2032 1
4 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 795 2
5 QSO B0605-0834 BLL 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 400 1
6 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1014 0
7 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 701 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2014ApJ...782L..28H and select 'bookmark this link' or equivalent in the popup menu


2020.12.02-14:55:39

© Université de Strasbourg/CNRS

    • Contact