J/MNRAS/342/738 HI Jodrell All Sky Survey (Lang+, 2003)
First results from the HI Jodrell All Sky Survey:
inclination-dependent selection effects in a 21-cm blind survey.
Lang R.H., Boyce P.J., Kilborn V.A., Minchin R.F., Disney M.J., Jordan C.A.,
Grossi M., Garcia D.A., Freeman K.C., Phillipps S., Wright A.E.
<Mon. Not. R. Astron. Soc. 342, 738 (2003)>
=2003MNRAS.342..738L 2003MNRAS.342..738L
ADC_Keywords: Surveys ; H I data ; Radial velocities
Keywords: surveys - galaxies: distances and redshifts - galaxies: evolution -
galaxies: luminosity function, mass function -
large-scale structure of Universe
Abstract:
Details are presented of the H I Jodrell All Sky Survey (HIJASS).
HIJASS is a blind neutral hydrogen (H I) survey of the northern sky
(δ>22°), being conducted using the multibeam receiver on the
Lovell Telescope (full width at half-maximum beamwidth 12-arcmin) at
Jodrell Bank. HIJASS covers the velocity range -3500 to 10000 km/s,
with a velocity resolution of 18.1km/s and spatial positional accuracy
of ∼2.5arcmin. Thus far about 1115 deg2 of sky have been surveyed.
The average rms noise during the early part of the survey was around
16mJy/beam Following the first phase of the Lovell Telescope upgrade
(in 2001), the rms noise is now around 13mJy/beam. We describe the
methods of detecting galaxies within the HIJASS data and of measuring
their H I parameters. The properties of the resulting H I-selected
sample of galaxies are described. Of the 222 sources so far confirmed,
170 (77 per cent) are clearly associated with a previously catalogued
galaxy. A further 23 sources (10 per cent) lie close (within 6 arcmin)
to a previously catalogued galaxy for which no previous redshift
exists. A further 29 sources (13 per cent) do not appear to be
associated with any previously catalogued galaxy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 103 222 The sample of confirmed HIJASS sources
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- HIJASS HIJASS source name (JHHMM+DD)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 19 F4.1 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 29 I2 arcsec DEs Declination (J2000)
31- 36 F6.2 Jy.km/s Sint Integrated flux density of H I line
38- 41 F4.2 Jy.km/s e_Sint rms uncertainty on Sint
43- 47 I5 mJy Speak 21cm peak flux density
49- 52 F4.1 mJy rms rms noise
54- 57 I4 km/s BRV Barycentric velocity
59- 61 I3 km/s DV20 Velocity width at 20% of the peak flux
63- 65 I3 km/s DV50 Velocity width at 50% of the peak flux
67- 70 A4 --- Class Classificiation (1)
72- 95 A24 --- OName Optical counterpart
96- 99 F4.1 arcmin Offset ? Position offset of the optical counterpart
from the H I position
101-103 I3 km/s OffVel ? Velocity offset of the barycentric
velocity contained within NED from the
barycentric velocity as measured by HIJASS
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Note (1): Classification use the following symbols:
ASS: object within NED which is spatially coincident with the HIJASS
source (i.e. within 6 arcmin) but for which no redshift is
listed in NED
ASS*: If there is more than one galaxy within 6 arcmin in NED
ID: object in NED which matches the HIJASS source in both position
and space (defined as being within 6 arcmin and 100km/s)
ID*: ID which have been detected in H I for the first time by HIJASS
PUG: previously uncatalogued galaxy
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History:
From electronic version of the journal
(End) James Marcout, Patricia Vannier [CDS] 11-Sep-2003