Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0305408)
· References in the article
· Citations to the Article (16) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (4)
· Also-Read Articles (Reads History)
· HEP/Spires Information
·
· Translate This Page
Title:
High-Velocity Cloud Complex H: A Satellite of the Milky Way in a Retrograde Orbit?
Authors:
Lockman, Felix J.
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944-0002 )
Publication:
The Astrophysical Journal, Volume 591, Issue 1, pp. L33-L36. (ApJL Homepage)
Publication Date:
07/2003
Origin:
UCP
ApJ Keywords:
Galaxy: Halo, Galaxy: Structure, ISM: Clouds, Radio Lines: ISM
DOI:
10.1086/376961
Bibliographic Code:
2003ApJ...591L..33L

Abstract

Observations with the Green Bank Telescope of 21 cm H I emission from the high-velocity cloud complex H suggest that it is interacting with the Milky Way. A model in which the cloud is a satellite of the Galaxy in an inclined, retrograde circular orbit reproduces both the cloud's average velocity and its velocity gradient with latitude. The model places complex H at R=33+/-9 kpc from the Galactic center on a retrograde orbit inclined ~45° to the Galactic plane. At this location, it has a mass in H I of greater than 6×106 Msolar and dimensions of at least 10×5 kpc. Some of the diffuse H I associated with the cloud has apparently been decelerated by interaction with Galactic gas. Complex H has similarities to the dwarf irregular galaxy Leo A and to some compact high-velocity clouds, and it has an internal structure nearly identical to parts of the Magellanic Stream, with a pressure P/k~100 cm-3 K.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints