TY - JOUR
T1 - A 500 kpc H i Extension of the Virgo pair NGC 4532/DDO 137 detected by the Arecibo Legacy ast ALFA (ALFALFA) survey
AU - Koopmann, Rebecca A.
AU - Giovanelli, Riccardo
AU - Haynes, Martha P.
AU - Kent, Brian R.
AU - Balonek, Thomas J.
AU - Brosch, Noah
AU - Higdon, James L.
AU - Salzer, John J.
AU - Spector, Oded
PY - 2008
Y1 - 2008
N2 - 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 respect to the NGC 4532/DDO 137 pair emission. Including diffuse emission, the structure has a total mass of up to 7 × 108 M, equivalent to ∼10% of the system's H I mass. Optical R-band imaging finds no counterparts to a level of 26.5 mag arcsec -2. The characteristics of the structure appear most consistent with a tidal origin.
AB - 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 respect to the NGC 4532/DDO 137 pair emission. Including diffuse emission, the structure has a total mass of up to 7 × 108 M, equivalent to ∼10% of the system's H I mass. Optical R-band imaging finds no counterparts to a level of 26.5 mag arcsec -2. The characteristics of the structure appear most consistent with a tidal origin.
KW - Galaxies: clusters: general
KW - Galaxies: clusters: individual (Virgo)
KW - Galaxies: evolution
KW - Galaxies: interactions
KW - Galaxies: spiral
KW - Galaxies: structure
UR - http://www.scopus.com/inward/record.url?scp=67650021591&partnerID=8YFLogxK
U2 - 10.1086/591124
DO - 10.1086/591124
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AN - SCOPUS:67650021591
SN - 0004-637X
VL - 682
SP - L85-L88
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART 2
ER -