2015ApJ...801...82H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST07:53:20

2015ApJ...801...82H - Astrophys. J., 801, 82 (2015/March-2)

Alma imaging of millimeter/submillimeter continuum emission in Orion KL.

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

Abstract (from CDS):

We have carried out high-resolution observations with the Atacama Large Millimeter/Submillimeter Array (ALMA) of continuum emission from the Orion Kleinmann-Low (KL) region. We identify 11 compact sources at ALMA band 6 (245 GHz) and band 7 (339 GHz), including the Hot Core, Compact Ridge, SMA1, IRc4, IRc7, and a radio source I (Source I). A spectral energy distribution (SED) of each source is determined by using previous 3 mm continuum emission data. Physical properties such as size, mass, hydrogen number density, and column density are discussed based on the dust graybody SED. Among 11 identified sources, Source I, a massive protostar candidate, is a dominant energy source in Orion KL. We extensively investigate its SED from centimeter to submillimeter wavelengths. The SED of Source I can be fitted with a single power-law index of 1.97, suggesting an optically thick emission. We employ the H free-free emission as an opacity source of this optically thick emission. The temperature, density, and mass of the circumstellar disk associated with Source I are constrained by the SED of H free-free emission. Still, the fitting result shows a significant deviation from the observed flux densities. Combined with the thermal dust graybody SED to explain excess emission at higher frequency, a smaller power-law index of 1.60 for the H free-free emission is obtained in the SED fitting. The power-law index smaller than two would suggest a compact source size or a clumpy structure unresolved with the present study. Future higher resolution observations with ALMA are essential to reveal more detailed spatial structure and physical properties of Source I.

Abstract Copyright:

Journal keyword(s): ISM: individual: Orion KL - radio continuum: stars - stars: formation - stars: individual: Orion Source I

Simbad objects: 31

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Number of rows : 31

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   ~ 1091 3
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2050 1
3 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 124 0
4 COUP 600 * 05 35 14.07 -05 22 36.6     15.906   12.799 M3 50 0
5 [FW2011] C32 mm 05 35 14.0700 -05 22 36.581           ~ 3 0
6 [FDB2011] MF1 mm 05 35 14.09 -05 22 36.7           ~ 4 0
7 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 298 2
8 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
9 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2063 1
10 [FDB2011] MF12 mm 05 35 14.18 -05 22 34.6           ~ 4 0
11 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 61 0
12 [FW2011] J053514.20-052237.15 Mas 05 35 14.20 -05 22 37.1           ~ 4 0
13 MLLA 610 IR 05 35 14.278 -05 22 30.65           ~ 73 0
14 COUP 621 Y*O 05 35 14.35371 -05 22 32.8820           ~ 106 0
15 [FW2011] J053514.431-052233.457 IR 05 35 14.431 -05 22 33.46           ~ 14 0
16 [FDB2011] MF2 mm 05 35 14.44 -05 22 34.4           ~ 6 0
17 [FDB2011] MF11 mm 05 35 14.45 -05 22 30.6           ~ 2 0
18 [FW2011] C34 mm 05 35 14.4640 -05 22 35.350           ~ 3 0
19 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 47 0
20 [FDB2011] MF6 mm 05 35 14.50 -05 22 32.6           ~ 4 0
21 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 177 0
22 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
23 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 591 1
24 [FW2011] J053514.556-052227.128 mm 05 35 14.556 -05 22 27.13           ~ 3 0
25 [FW2011] J053514.579-052230.679 Y*O 05 35 14.579 -05 22 30.68           ~ 3 0
26 [FW2011] C33 mm 05 35 14.6130 -05 22 29.688           ~ 2 0
27 [EC2006] MM24 mm 05 35 14.614 -05 22 28.70           ~ 5 0
28 [FDB2011] MF10 mm 05 35 14.68 -05 22 28.9           ~ 3 0
29 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 805 2
30 QSO B0605-0834 BLL 06 07 59.69923743 -08 34 49.9781718     18.5 17.70   ~ 409 1
31 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 283 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-07:53:20

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