Access to Astronomical Catalogues

← Click to display the menu
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 NHI∼1019cm-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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 128 Physical properties of confirmed detections in the Westerbork Virgo Filament Survey total-power data table2.dat 57 20 Source properties of candidate HI detections in the Westerbork Virgo Filament Survey notes.dat 80 159 Individual notes
See also: J/MNRAS/357/819 : Colours and HI line observations in Virgo (Sabatini+, 2005) J/AJ/133/2569 : ALALFA survey. Northern Virgo HI sources (Giovanelli+, 2007) J/AJ/136/713 : ALALFA survey. Second Virgo HI sources (Kent+, 2008) J/A+A/528/A28 : WSRT Virgo HI filament survey. II. (Popping+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [WVFS] 6- 14 A9 --- WVFS WVFS name (HHMM+DDMM) 15 A1 --- f_WVFS [*] Correction note (1) 17- 40 A24 --- OName Optical ID 42- 43 I2 h RAh Right ascension (J2000) 45- 46 I2 min RAm Right ascension (J2000) 48- 49 I2 s RAs Right ascension (J2000) 51 A1 --- DE- Declination sign (J2000) 52- 53 I2 deg DEd Declination (J2000) 55- 56 I2 arcmin DEm Declination (J2000) 58- 61 I4 km/s HRV Heliocentric recession velocity 63- 67 F5.1 SHI Integrated HI flux 69- 71 I3 km/s W20 Width velocity at 20% of the peak flux 72 A1 --- n_W20 [*] edge detection (2) 74- 97 A24 --- ONames Other optical IDs
Note (1): for WVFS 12222+0915 corrected into WVFS 1222+0915 by CDS. Note (2): * indicates several of the detections are at the edge of the frequency coverage of the cube. The observed spectrum for these sources is not complete, which results in only a lower limit to the integrated flux. We will not consider these sources in our further analysis.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [WVFS] 6- 14 A9 --- WVFS WVFS name (HHMM+DDMM) 16- 17 I2 h RAh Right ascension (J2000) 19- 20 I2 min RAm Right ascension (J2000) 22- 23 I2 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 33 I2 arcsec DEs Declination (J2000) 35- 38 I4 km/s HRV Heliocentric radial velocity 40- 43 F4.1 SHI Integrated HI flux 45- 47 I3 km/s W20 Width velocity at 20% of the peak flux 49- 52 F4.2 sigma rms noise level 54- 57 F4.1 --- S/N Signal-to-noise ratio
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 9 A9 --- WVFS WVFS name (HHMM+DDMM) 11- 80 A70 --- Note Text of the note
History: From electronic version of the journal References: Popping & Braun, Paper II 2011A&A...528A..28P, Cat. J/A+A/528/A28
(End) Patricia Vannier [CDS] 28-Jun-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service