Chandra
Orion Ultradeep Project
Global properties
Here we provide an overview of the the Orion Nebula region as seen in the X-ray band with two goals: to further understand the structure of the stellar clusters; and to use the Orion Nebula Cluster as a template for less sensitive studies of more distant young stellar clusters.
These are diagrams of the locations of COUP cloud members in the sky. The top panel shows the lightly obscured stars (roughly AV<5 magnitudes) constituting most members of the Orion Nebula Cluster (ONC). The deficit of stars to the east (left side) seems real and suggests the cluster is not in dynamical equilibrium. The bottom panel shows the heavily obscured stars. They show small, very young clusters around the Orion Molecular Cloud cores slightly west of the ONC. The red triangles show the bright massive Trapezium stars.
Here we show
the distributions of X-ray luminosities for ONC stars of different masses.
Dashed: M<0.3 Mo. Dotted: 0.3<M<1 Mo. Solid: 1<M<3
Mo. Hatched: 3<M<10
Mo. Asterisks: 10<M<30
Mo. Circle: 45 Mo (theta1 Ori C).
The unit Mo is solar
mass.
Note the huge range overall from 1027 to 1033 erg/s. (For comparison, the Sun today emits between 1026-1027 erg/s, reaching 1028 erg/s during the biggest flares, in the Chandra 0.5-8 keV band.) The unit erg/s is 10-7 watts.
The full paper on the COUP global properties is:
Global X-ray properties of the Orion Nebula region
Eric D. Feigelson, Konstantin Getman, Leisa Townsley, Gordon Garmire, Thomas Preibisch, Nicolas Grosso, Thierry Montmerle
Back to the COUP home page
Global properties
Here we provide an overview of the the Orion Nebula region as seen in the X-ray band with two goals: to further understand the structure of the stellar clusters; and to use the Orion Nebula Cluster as a template for less sensitive studies of more distant young stellar clusters.
These are diagrams of the locations of COUP cloud members in the sky. The top panel shows the lightly obscured stars (roughly AV<5 magnitudes) constituting most members of the Orion Nebula Cluster (ONC). The deficit of stars to the east (left side) seems real and suggests the cluster is not in dynamical equilibrium. The bottom panel shows the heavily obscured stars. They show small, very young clusters around the Orion Molecular Cloud cores slightly west of the ONC. The red triangles show the bright massive Trapezium stars.
Note the huge range overall from 1027 to 1033 erg/s. (For comparison, the Sun today emits between 1026-1027 erg/s, reaching 1028 erg/s during the biggest flares, in the Chandra 0.5-8 keV band.) The unit erg/s is 10-7 watts.
The full paper on the COUP global properties is:
Global X-ray properties of the Orion Nebula region
Eric D. Feigelson, Konstantin Getman, Leisa Townsley, Gordon Garmire, Thomas Preibisch, Nicolas Grosso, Thierry Montmerle
Back to the COUP home page