2015ApJ...813L..19J


Query : 2015ApJ...813L..19J

2015ApJ...813L..19J - Astrophys. J., 813, L19 (2015/November-1)

A keplerian-like disk around the forming O-type star AFGL 4176.

JOHNSTON K.G., ROBITAILLE T.P., BEUTHER H., LINZ H., BOLEY P., KUIPER R., KETO E., HOARE M.G. and VAN BOEKEL R.

Abstract (from CDS):

We present Atacama Large Millimeter/submillimeter Array line and continuum observations at 1.2 mm with ∼0".3 resolution that uncover a Keplerian-like disk around the forming O-type star AFGL 4176. The continuum emission from the disk at 1.21 mm (source mm1) has a deconvolved size of 870±110 AUx330±300 AU and arises from a structure ∼8 M in mass, calculated assuming a dust temperature of 190 K. The first-moment maps, pixel-to-pixel line modeling, assuming local thermodynamic equilibrium (LTE), and position-velocity diagrams of the CH3CN J = 13-12 K-line emission all show a velocity gradient along the major axis of the source, coupled with an increase in velocity at small radii, consistent with Keplerian-like rotation. The LTE line modeling shows that where CH3CN J = 13-12 is excited, the temperatures in the disk range from ∼70 to at least 300 K and that the H2column density peaks at 2.8x1024/cm2. In addition, we present Atacama Pathfinder Experiment 12CO observations that show a large-scale outflow from AFGL 4176 perpendicular to the major axis of mm1, supporting the disk interpretation. Finally, we present a radiative transfer model of a Keplerian disk surrounding an O7 star, with a disk mass and radius of 12 M and 2000 AU that reproduces the line and continuum data, further supporting our conclusion that our observations have uncovered a Keplerian-like disk around an O-type star.

Abstract Copyright:

Journal keyword(s): circumstellar matter - ISM: jets and outflows - radiative transfer - stars: formation - stars: massive - techniques: interferometric

Nomenclature: Fig. 1: [JRB2015] AFGL 4176 mmN (Nos mm1-mm8).

Simbad objects: 14

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Number of rows : 14
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 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1647 1
2 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 688 1
3 2FGL J1307.6-6704 Bla 13 08 17.3747 -67 07 05.227           ~ 28 0
4 NAME VLBI 1325-558 QSO 13 29 01.1458999868 -56 08 02.653470323           ~ 63 2
5 [JRB2015] AFGL 4176 mm1 * 13 43 01.693 -62 08 51.25           ~ 6 0
6 RAFGL 4176 Y*O 13 43 01.70352 -62 08 51.2304           ~ 98 0
7 QSO B1424-41 QSO 14 27 56.29756536 -42 06 19.4375991   18.48 17.7 16.30   ~ 402 1
8 3FGL J1617.4-5846 AGN 16 17 17.8913859288 -58 48 07.860059063   18.23       ~ 107 1
9 IRAS 16547-4247 Y*O 16 58 17.21 -42 52 08.9           ~ 123 0
10 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 132 1
11 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12383 0
12 W 33a Y*O 18 14 39.0 -17 52 03           ~ 599 0
13 [CBH2011c] EGO G35.03+0.35 -CM2 Rad 18 54 00.6498 +02 01 19.320           ~ 10 0
14 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 407 0

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2021.09.23-04:20:30

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