A 500 kpc HI Tail of the Virgo Pair NGC4532/DDO137 Detected by ALFALFA

Details A 500 kpc HI Tail of the Virgo Pair NGC4532/DDO137 Detected by ALFALFA A 500 kpc HI Tail of the Virgo Pair NGC4532/DDO137 Detected by ALFALFA

2007-07-22

arxiv.org/abs/0707.3277v1

Astronomy and Astrophysics

Astrophysics

2 pages. To be published in proceedings of IAU Symposium 244: 'Dark Galaxies and Lost Baryons', J. I. Davies & M. D. Disney. e

Scientific paper

10.1017/S1743921307014287

HI observations of the Virgo Cluster pair NGC 4532/DDO 137, conducted as part of the Arecibo Legacy Fast ALFA Survey (ALFALFA), reveal an HI feature extending ~500 kpc to the southwest. The structure has a total mass of up to 7 x 10^8 solar masses, equivalent to 10% of the pair HI mass. Optical R imaging reveals no counterparts to a level of 26.5 magnitudes per square arcsec. The structure is likely the result of galaxy harassment.

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