2005ApJS..160..379F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST10:18:29

2005ApJS..160..379F - Astrophys. J., Suppl. Ser., 160, 379-389 (2005/October-0)

Global X-ray properties of the Orion nebula region.

FEIGELSON E.D., GETMAN K., TOWNSLEY L., GARMIRE G., PREIBISCH T., GROSSO N., MONTMERLE T., MUENCH A. and McCAUGHREAN M.

Abstract (from CDS):

Based on the Chandra Orion Ultradeep Project (COUP) observation, we establish the global X-ray properties of the stellar population associated with the Orion Nebula. Three components contribute roughly equally to the integrated COUP luminosity in the hard (2-8 keV) X-ray band: several OB stars, 822 lightly obscured cool stars in the Orion Nebula Cluster (ONC), and 559 heavily obscured stars. ONC stars 0.5-2 pc from the center show a spatial asymmetry consistent with violent relaxation in the stellar dynamics. The obscured COUP sources concentrate around both OMC-1 molecular cores; these small-scale structures indicate ages t≲0.1 Myr. The X-ray luminosity function (XLF) of the lightly obscured sample is roughly lognormal in shape. The obscured population is deficient in lower luminosity stars, perhaps due to localized circumstellar material. Mass-stratified XLFs show that one-third of the Orion Nebula region hard-band emission is produced by the bright O6 star θ1 Ori C and half is produced by lower mass pre-main-sequence stars with masses 0.3 M<M<3 M. Very low mass stars contribute little to the cluster X-ray emission. Using the hard band emission, we show that young stellar clusters like the ONC can be readily detected and resolved with Chandra across the Galactic disk, even in the presence of heavy obscuration. The Orion Nebula sample is a valuable template for studies of distant clusters. For example, the peak of the XLF shape can serve as a standard candle for a new distance measure to distant young stellar clusters, and the presence of a neon emission line complex around 1 keV can serve as a diagnostic for young stars.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Name: Orion Nebula - Galaxy: Open Clusters and Associations: General - Galaxy: Open Clusters and Associations: Individual: Name: Orion Nebula Cluster - Stars: Formation - Stars: Pre-Main-Sequence - X-Rays: Stars

Simbad objects: 21

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Number of rows : 21

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 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2050 1
2 HD 36982 Or* 05 35 09.8365316854 -05 27 53.213773794 8.00 8.58 8.46     B1.5Vp 187 0
3 COUP 590 * 05 35 13.9700 -05 22 31.900           ~ 55 0
4 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1051 2
5 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 298 2
6 MLLA 293 Y*O 05 35 14.3976 -05 23 50.914           ~ 28 0
7 NAME OMC 1S PoC 05 35 14.5 -05 25 49           ~ 71 1
8 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 463 1
9 COUP 766 X 05 35 16.07268 -05 23 07.0288           ~ 20 1
10 * tet01 Ori B EB* 05 35 16.1338018078 -05 23 06.780627482 7.71 8.20 7.96     B1V 349 2
11 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1299 1
12 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 308 0
13 M 42 HII 05 35 17.3 -05 23 28           ~ 3787 0
14 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 234 1
15 V* V1230 Ori Or* 05 35 20.7209093902 -05 21 44.340751344 9.886 10.041 9.736 9.25 8.822 B1 86 0
16 * tet02 Ori A SB* 05 35 22.9022511214 -05 24 57.817182421 5.37 6.30 6.39 6.30 6.35 O9.5IVp 505 0
17 * tet02 Ori B Y*O 05 35 26.4004225055 -05 25 00.792538337 5.36 6.29 6.38 6.29 11.050 B2-B5 179 0
18 OMC 2 MoC 05 35 27 -05 10.1           ~ 404 1
19 HD 37061 Or* 05 35 31.3653515656 -05 16 02.586154009 6.44 7.09 6.83     O9V 330 0
20 OMC 4 MoC 05 36 06 -05 35.7           ~ 54 0
21 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1

    Equat.    Gal    SGal    Ecl

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