GASS High Velocity Clouds in the Region of the Magellanic Leading Arm

Abstract

We present a catalog of high-velocity clouds in the region of the Magellanic Leading Arm. The catalog is based on neutral hydrogen (\HI) observations from the Parkes Galactic All-Sky Survey (GASS). Excellent spectral resolution allows clouds with narrow-line components to be resolved. The total number of detected clouds is 419. We describe the method of cataloging and present the basic parameters of the clouds. We discuss the general distribution of the high-velocity clouds and classify the clouds based on their morphological type. The presence of a significant number of head-tail clouds and their distribution in the region is discussed in the context of Magellanic System simulations. We suggest that ram-pressure stripping is a more important factor than tidal forces for the morphology and formation of the Magellanic Leading Arm and that different environmental conditions might explain the morphological difference between the Magellanic Leading Arm and Magellanic Stream. We also discuss a newly identified population of clouds that forms the LA IV and a new diffuse bridge-like feature connecting the LA II and III complexes.

20 pages, 24 figures, accepted by ApJ on December 14, 2012

References in corpus (7)

• Are the Magellanic Clouds on their First Passage about the Milky Way?
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• The Origin of the Magellanic Stream and Its Leading Arm
• The many streams of the Magellanic Stream
• An Interaction of a Magellanic Leading Arm High Velocity Cloud with the Milky Way Disk
• Implications of Recent Measurements of the Milky Way Rotation for the Orbit of the Large Magellanic Cloud
• The four leading arms of the Magellanic Cloud system

Cited by in corpus (22)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The Magellanic Stream: Circumnavigating the Galaxy
• The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
• A new all-sky map of Galactic high-velocity clouds from the 21-cm HI4PI survey
• The VMC Survey. XIII. Type II Cepheids in the Large Magellanic Cloud
• The VMC Survey. VIII. First results for Anomalous Cepheids
• Discovery of the Magellanic Stellar Stream Out to 100 Kiloparsecs
• Chemical Abundances in the Leading Arm of the Magellanic Stream
• The Magellanic Stream and Debris Clouds
• Recent Star Formation in the Leading Arm of the Magellanic Stream
• Kinematics of the Magellanic Stream and Implications for its Ionization
• Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
• Radiative Turbulent Mixing Layers and the Survival of Magellanic Debris
• Magnetic field draping around clumpy high-velocity clouds in galactic halo
• H$\alpha$ Distances to the Leading Arm of the Magellanic Stream
• The Distance and Properties of Hydrogen Clouds in the Leading Arm of the Magellanic System
• Chemical Composition of Young Stars in the Leading Arm of the Magellanic System
• Insights into the physics when modeling cold gas clouds in a hot plasma
• Following the tidal trail: a history of modeling the Magellanic Stream
• Properties of 3D HI Filaments in the Smith High Velocity Cloud
• The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits
• Tracing dense and diffuse neutral hydrogen in the halo of the Milky Way