Observations of Shocked Regions

Thermal Water Vapor Emission from Shocked Regions in Orion

Using the Long Wavelength Spectrometer (LWS) onboard the Infrared Space Observatory (ISO), we have observed thermal water vapor emission from a roughly circular field of view approximately 75 arc seconds in diameter centered on the Orion BN-KL region. The Fabry-Perot line strengths, line widths, and spectral line shifts observed in eight transitions between 71 and 125μm show good agreement with...

Formation of Active Regions: Observations and Theory

Active regions can be used as a diagnostic of the sub-photo-spheric activity. In this review I will discuss how the physical conditions in the subsurface layers of the Sun form and modify the three dimensional complex of the active region. Many characteristics of active regions are related to the conditions under which magnetic ux tubes are generated and to their evolution as they rise in the s...

Observations of Infall in Star-forming Regions

Stars , H II regions , and shocked gas in the bar of NGC 1530

We analyse long slit spectra taken along and perpendicular to the bar of the galaxy NGC 1530. Our data show that the H ii regions, around young massive stars that form in the shock-compressed gas, share the same kinematics as the molecular gas in the x 2 orbits at the center of the galaxy. Along the bar, the H ii regions are in the post-shock zone, downstream of the dust lanes that contain mole...

Observations of the Galactic Center : Shocked Gas in the Radio Arc Bubble

We present Spitzer IRS spectra (R ∼ 600, 10 – 38 μm) of 38 positions in the Galactic Center (GC), all at the same Galactic longitude and spanning ±0.3 in latitude. Our positions include the Arches Cluster, the Arched Filaments, regions near the Quintuplet Cluster, the “Bubble” lying along the same line-ofsight as the molecular cloud G0.11−0.11, and the diffuse interstellar gas along the line-of...