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|H I 21 cm Observations of the PG 1216+069 Sub-damped Lyα Absorber Field at z = 0.00632|
The Westerbork Synthesis Radio Telescope finds a weak 21 cm lineemission feature at the coordinates (R.A., decl., velocity) of thesub-damped Lyα (DLA) absorber observed at zabs=0.00632in the spectrum of PG 1216+069. The emission feature, WSRT J121921+0639,lies within 30" of the quasar sight line, is detected at a 99.8% (3σ) confidence level, has MHI between 5 and15×106 Msolar, and has a velocity spreadbetween 20 and 60 km s-1. Other H I emitters in the fieldinclude VCC 297 at a projected distance of 86h-175 kpc and a previously unreported H I cloud,WSRT J121919+0624, at 112 h-175 kpc withMHI~3×108 Msolar. The opticallyidentified foreground galaxy that is closest to the quasar sight lineappears to be VCC 339 (~L*/25) at 29h-175 kpc with a velocity offset of 292 kms-1. A low surface brightness galaxy with the H I mass of thesub-DLA absorber WSRT J121921+0639 would likely have mB~17,and its diffuse optical emission would need to compete with the light ofboth the background QSO and a brighter foreground star ~10" from the QSOsight line.
|Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area.|
The present catalog of 2096 galaxies within an area of about 140 sq degapproximately centered on the Virgo cluster should be an essentiallycomplete listing of all certain and possible cluster members,independent of morphological type. Cluster membership is essentiallydecided by galaxy morphology; for giants and the rare class of highsurface brightness dwarfs, membership rests on velocity data. While 1277of the catalog entries are considered members of the Virgo cluster, 574are possible members and 245 appear to be background Zwicky galaxies.Major-to-minor axis ratios are given for all galaxies brighter than B(T)= 18, as well as for many fainter ones.
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