An extremely high velocity CO outflow from NGC 7538 IRS 9

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/185995· OSTI ID:5541173

Mitchell, G F; Hasegawa, T I ^[1]

---

1. Saint Mary's University, Halifax (Canada)

New observations of the luminous protostellar object NGC 7538 IRS 9 are presented. Lines of CO J = 3-2 show an extremely high velocity (EHV) red wing, with outflow velocities of 110 km/s. The EHV-emitting region is compact and is centered at a position 5 arcsec east of IRS 9. The emission in lower velocity (classical HV) gas is spatially extended and bipolar. The different spatial distribution and kinematics of the HV and EHV gas imply that the outflow activity of IRS 9 has been discontinuous. The activity which produced the extended HV outflow began roughly 16,000 yr ago, while the activity which produced the EHV gas began roughly 1200 yr ago. The EHV gas has only 3 percent of the mass of the HV gas, but 1.5 times the kinetic energy. 13 refs.

• OSTI ID: 5541173
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 371; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC GASES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY
FLUID FLOW
FLUIDS
GAS FLOW
GASES
INFRARED RADIATION
KINETIC ENERGY
MASS
MASS TRANSFER
OXIDES
OXYGEN COMPOUNDS
PROTOSTARS
RADIATIONS
SPATIAL DISTRIBUTION