The GALFA-HI Compact Cloud Catalog
Destry R. Saul, J. E. G. Peek, J. Grcevich, M. E. Putman, K. A., Douglas, E. J. Korpela, S. Stanimirovic, C. Heiles, S. J. Gibson, M. Lee, A., Begum, A. R. H. Brown, B. Burkhart, E. T. Hamden, N. M. Pingel, S. Tonnesen

TL;DR
This paper presents a catalog of 1964 compact neutral hydrogen clouds identified from GALFA-HI survey data using a machine-vision algorithm, revealing diverse populations and their potential Galactic origins.
Contribution
The paper introduces a new catalog of isolated, compact HI clouds detected with a novel machine-vision method, providing insights into their properties and Galactic distribution.
Findings
High velocity clouds are associated with known complexes.
No large population of isolated high-velocity clouds was found.
Evidence of different cloud populations with distinct kinematic histories.
Abstract
We present a catalog of 1964 isolated, compact neutral hydrogen clouds from the Galactic Arecibo L-Band Feed Array Survey Data Release One (GALFA-HI DR1). The clouds were identified by a custom machine-vision algorithm utilizing Difference of Gaussian kernels to search for clouds smaller than 20'. The clouds have velocities typically between |VLSR| = 20-400 km/s, linewidths of 2.5-35 km/s, and column densities ranging from 1 - 35 x 10^18 cm^-2. The distances to the clouds in this catalog may cover several orders of magnitude, so the masses may range from less than a Solar mass for clouds within the Galactic disc, to greater than 10^4 Solar Masses for HVCs at the tip of the Magellanic Stream. To search for trends, we separate the catalog into five populations based on position, velocity, and linewidth: high velocity clouds (HVCs); galaxy candidates; cold low velocity clouds (LVCs); warm,…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
