Reconstructing Deconstruction: High-Velocity Cloud Distance Through Disruption Morphology

Abstract

We present Arecibo L-band Feed Array 21-cm observations of a sub-complex of HVCs at the tip of the Anti-Center Complex. These observations show morphological details that point to interaction with the ambient halo medium and differential drag within the cloud sub-complex. We develop a new technique for measuring cloud distances, which relies upon these observed morphological and kinematic characteristics, and show that it is consistent with H-alpha distances. These results are consistent with distances to HVCs and halo densities derived from models in which HVCs are formed from cooling halo gas.

8 pages, 2 figures, 1 tabe, Accepted to ApJ

References in corpus (17)

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Cited by in corpus (40)

• Gaseous Galaxy Halos
• HI in Local Group Dwarf Galaxies and Stripping by the Galactic Halo
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• GASS: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release
• The GALFA-HI Survey: Data Release 1
• The Magellanic Stream: Circumnavigating the Galaxy
• A Reservoir of Ionized Gas in the Galactic Halo to Sustain Star Formation in the Milky Way
• The Fate of High-Velocity Clouds: Warm or Cold Cosmic Rain?
• The Disruption and Fueling of M33
• Infall Times for Milky Way Satellites From Their Present-Day Kinematics
• Smith's Cloud: A High-velocity Cloud Colliding with the Milky Way
• Velocity Spectrum for HI at High Latitudes
• Gas Condensation in the Galactic Halo
• GASKAP -- The Galactic ASKAP Survey
• Redistributing hot gas around galaxies: do cool clouds signal a solution to the overcooling problem?
• Circum-Galactic Gas and the Isotropic Gamma Ray Background
• Simulations of High-Velocity Clouds. I. Hydrodynamics and High-Velocity High Ions
• Ongoing Galactic Accretion: Simulations and Observations of Condensed Gas in Hot Halos
• Ionized Gas in the Smith Cloud
• The Gas-Galaxy Connection at z = 0.35: OVI and HI Absorption Towards J0943+0531
• Head-Tail Clouds: Drops to Probe the Diffuse Galactic Halo
• Measurement of a Magnetic Field in a Leading Arm High Velocity Cloud
• The Arecibo Legacy Fast ALFA Survey: V. HI Source Catalog of the Anti-Virgo Region at dec=27 degrees
• Physical Properties of Complex C Halo Clouds
• Gas Accretion onto the Milky Way
• Hitting the Bull's-eye: The Radial Profile of Accretion and Star Formation in the Milky Way
• An Old Supernova Remnant within an HII Complex at l {\approx} 173{\circ}: FVW 172.8+1.5
• A peculiar HI cloud near the distant globular cluster Pal 4
• Mass, Morphing, Metallicities: The Evolution of Infalling High Velocity Clouds
• Dust-to-Gas Ratios of the GALFA-HI Compact Cloud Catalog
• The First Distance Constraint on the Renegade High Velocity Cloud Complex WD
• The Interstellar Medium: The Key Component in Galactic Evolution and Modern Cosmology
• Observations towards early-type stars in the ESO-POP survey: II -- searches for intermediate and high velocity clouds
• Three-Dimensional Orientation of Compact High Velocity Clouds
• A new delivery route to Galactic Nuclei: Warm halo cloud impacts
• An Intermediate Velocity HI Cloud Falling to the Galactic Disk; Possible Evidence for Low Metallicity HI Gas Originated Outside the Galactic Disk
• The Baryonic Mass Estimates of the Milky Way Halo in the form of High Velocity Clouds
• Modeling the Accretion of High-Velocity Clouds from a Rotating Halo
• Simulating High-Velocity Clouds in the Observational Plane: An Initial Study with the Smith Cloud
• Ionization of Infalling Gas