/ftp/cats/A+A/527/A90



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J/A+A/527/A90       WSRT Virgo HI filament survey            (Popping+, 2011)
The following files can be converted to FITS (extension .fit or fit.gz)
	table1.dat table2.dat notes.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/527/A90
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drwxr-xr-x 28 cats archive 4096 Nov 21 2017 [Up] drwxr-xr-x 2 cats archive 4096 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 486 Dec 19 2022 .message -r--r--r-- 1 cats archive 6731 Jun 2 2012 ReadMe -rw-r--r-- 1 cats archive 335 Sep 18 2011 +footg5.gif -rw-r--r-- 1 cats archive 3000 Sep 18 2011 +footg8.gif -r--r--r-- 1 cats archive 11696 Jun 28 2011 notes.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 9638 Jun 28 2011 table1.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 1160 Jun 28 2011 table2.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/A+A/527/A90 WSRT Virgo HI filament survey (Popping+, 2011) ================================================================================ The WSRT Virgo HI filament survey. I. Total power data. Popping A., Braun R. <Astron. Astrophys., 527, A90 (2011)> =2011A&A...527A..90P ================================================================================ ADC_Keywords: Surveys ; Clusters, galaxy ; Galaxies, radio ; H I data Keywords: galaxies: evolution - intergalactic medium Abstract: Observations of neutral hydrogen can provide a wealth of information about the kinematics of galaxies. To learn more about the large-scale structures and accretion processes, the extended environment of galaxies have to be observed. Numerical simulations predict a cosmic web of extended structures and gaseous filaments. To observe the direct vicinity of galaxies, column densities have to be achieved that probe the regime of Lyman limit systems. Typically, HI observations are limited to a brightness sensitivity of N_HI_ 10^19^cm^-2^, but this has to be improved by  2 orders of magnitude. With the Westerbork Synthesis Radio Telescope (WSRT), we mapped the galaxy filament connecting the Virgo Cluster with the Local Group. About 1500 square degrees on the sky was surveyed with Nyquist sampled pointings. By using the WSRT antennas as single-dish telescopes instead of the more conventional interferometer, we were very sensitive to extended emission. The survey consists of a total of 22000 pointings, and each pointing was observed for two minutes with 14 antennas. Description: To obtain the highest possible brightness sensitivity in cross-correlations, the WSRT (Westerbork Synthesis Radio Telescope) was configured to simulate a large filled aperture in projection. Twelve of the 14 WSRT 25m telescopes were positioned at regular intervals of 144m. A deep fully-sampled survey of the galaxy filament joining the Local Group to the Virgo Cluster has been undertaken, extending from 8 to 17h in RA and from -1 to +10 degrees in declination and covering 40MHz of bandwidth with 8km/s resolution.