HI observations of three compact high-velocity clouds around the Milky Way

Abstract

We present deep HI observations of three compact high-velocity clouds (CHVCs). The main goal is to study their diffuse warm gas and compact cold cores. We use both low- and high-resolution data obtained with the 100 m Effelsberg telescope and the Westerbork Synthesis Radio Telescope (WSRT). The combination is essential in order to study the morphological properties of the clouds since the single-dish telescope lacks a sufficient angular resolution while the interferometer misses a large portion of the diffuse gas. Here single-dish and interferometer data are combined in the image domain with a new combination pipeline. The combination makes it possible to examine interactions between the clouds and their surrounding environment in great detail. The apparent difference between single-dish and radio interferometer total flux densities shows that the CHVCs contain a considerable amount of diffuse gas with low brightness temperatures. A Gaussian decomposition indicates that the clouds consist predominantly of warm gas.

11 pages, 7 figures, accepted for publication by A&A

References in corpus (5)

• An Accurate Distance to High-Velocity Cloud Complex C
• The Shapes of the HI Velocity Profiles of the THINGS Galaxies
• The four leading arms of the Magellanic Cloud system
• Physical properties of two compact high-velocity clouds possibly associated with the Leading Arm of the Magellanic System
• Global properties of the HI high velocity sky, a statistical investigation based on the LAB survey

Cited by in corpus (6)

• Physical effects on compact high-velocity clouds in the circumgalactic medium
• Identifying galaxy candidates in WSRT HI imaging of ultra-compact high velocity clouds
• A High-Velocity Cloud Impact Forming a Supershell in the Milky Way
• High-resolution HI and CO observations of high-latitude intermediate-velocity clouds
• One of Everything: The Breakthrough Listen Exotica Catalog
• The Baryonic Mass Estimates of the Milky Way Halo in the form of High Velocity Clouds