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A 500 Kpc Hi Extension Of The Virgo Pair Ngc4532/Ddo137 Detected By The Arecibo Legacy Fast Alfa (Alfalfa) Survey, Rebecca A. Koopmann, Riccardo Giovanelli, Martha P. Haynes, Brian R. Kent, Thomas J. Balonek, Noah Brosch, James L. Higdon, John J. Salzer, Oded Spector
A 500 Kpc Hi Extension Of The Virgo Pair Ngc4532/Ddo137 Detected By The Arecibo Legacy Fast Alfa (Alfalfa) Survey, Rebecca A. Koopmann, Riccardo Giovanelli, Martha P. Haynes, Brian R. Kent, Thomas J. Balonek, Noah Brosch, James L. Higdon, John J. Salzer, Oded Spector
Department of Physics and Astronomy Faculty Publications
We report the discovery of a ~500 kpc H I extension southwest of the Virgo Cluster H I-rich pair NGC 4532/DDO 137, detected as part of the Arecibo Legacy Fast ALFA (ALFALFA) Survey. The feature is the longest and most massive H I tail structure so far found in the Virgo Cluster and, at 1.8 Mpc from M87, the most distant from the main concentration of the intracluster medium. The structure is spatially and spectrally separated into two ridges and is defined by diffuse emission and discrete clumps of mass (2.5–6.8) × 107 M☉. All emission is blueshifted with …