The dynamics and physical properties of the cometary nebula G29. 96 - 0. 02

Journal Article · Wed May 01 04:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/169965· OSTI ID:5587689

Wood, D O.S.; Churchwell, E ^[1]

---

1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA) Wisconsin, University, Madison (USA)

The H76-alpha recombination line emission distribution from the cometary UC H II regions G29.96 - 0.02 has been mapped with a resolution of 0.62 x 0.49 arcsec. The distribution of radial velocities in the ionized gas is well ordered. There is an unambiguous velocity gradient across the face of the nebula with velocities ranging from about 80 km/s on the leading edge of the cometary arc to about 105 km/s in the 'tail', a shift of about 25 km/s over an angular distance of about 4 arcsec. The linewidths are significantly broader along the leading edge of the cometary arc than elsewhere in the nebula. LTE electron temperatures are systematically low throughout the nebula, ranging from about 2500 K to 4200 K at different points in the H II region. Non-LTE line models combined with the continuum image imply that the electron densities in the arc are 5-10 times greater than in the tail of the nebula. G29.96 - 0.02 is moderately attenuated by interstellar dust. 25 refs.

• OSTI ID: 5587689
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 372; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMETS
COSMIC DUST
COSMIC RADIO SOURCES
DUSTS
DYNAMICS
ELECTRON DENSITY
ELECTRON TEMPERATURE
EMISSION SPECTRA
EQUILIBRIUM
FLUIDS
GASES
H2 REGIONS
INTERSTELLAR SPACE
IONIZED GASES
LINE WIDTHS
LTE
MATHEMATICAL MODELS
MECHANICS
NEBULAE
PHYSICAL PROPERTIES
RADIAL VELOCITY
SPACE
SPECTRA
VELOCITY