J/MNRAS/352/478 HI obs. of low surface brightness dwarf gal. (Roberts+, 2004)
A search for low surface brightness dwarf galaxies in different environments.
Roberts S., Davies J., Sabatini S., Van Driel W., O'neil K., Baes M.,
Linder S., Smith R., Evans R.
<Mon. Not. R. Astron. Soc., 352, 478-492 (2004)>
=2004MNRAS.352..478R 2004MNRAS.352..478R
ADC_Keywords: Clusters, galaxy ; H I data ; Redshifts
Keywords: surveys - galaxies: clusters: individual: Virgo cluster -
galaxies: clusters: individual: Ursa Major - galaxies: dwarf
Abstract:
According to the cold dark matter (CDM) hierarchical clustering theory
of galaxy and large-scale structure formation, there should be
numerous low-mass dark matter haloes present in the Universe today.
If these haloes contain sufficient stars, they should be detectable as
low-luminosity stellar systems or dwarf galaxies. We have previously
described a new detection method for faint low surface brightness
objects and we have shown that there are relatively large numbers of
very faint dwarf galaxies in the nearby Virgo cluster. In this paper,
we present results from a similar survey carried out on the Millennium
Galaxy strip (MGS, cat. VII/240), which runs along the celestial
equator and samples a very different galaxy environment.
Description:
The optical data for this paper were obtained using the Wide Field
Camera (WFC) on the Isaac Newton Telescope, La Palma, Canary Islands
as part of the Wide Field Survey, a multicolour data survey covering
over 200deg2 of sky.
The Millennium Galaxy strip (MGS) data were obtained during four
observing runs in 1999 and 2000 and consist of 144 fields running
along the celestial equator (full details can be found in Liske et al.,
2003, Cat. VII/240).
The 305-m Arecibo telescope was initially used to observe a pilot
sample of 12 objects from our catalogue of candidate LSB dwarf
galaxies in 2003 May and a further 56 objects were observed in 2004
January.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 51 Table of sure optical detections in the
Millennium Galaxy strip (MGS)
table2.dat 66 6 Table of detections in the UMa cluster
table3.dat 99 59 Table of unsure detections in the MGS
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See also:
VII/240 : Millennium Galaxy Catalogue (Liske+, 2003)
J/ApJS/81/5 : Green Bank neutral hydrogen survey (Schneider+, 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number,
[RDS2004] MGS sure NN in Simbad
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10- 14 F5.2 s RAs Right ascension (J2000.0)
16 A1 --- DE- Declination sign (J2000.0)
17- 18 I2 deg DEd Declination (J2000.0)
20- 21 I2 arcmin DEm Declination (J2000.0)
23- 26 F4.1 arcsec DEs Declination (J2000.0)
28- 31 F4.1 mag Bmag B magnitude
33- 36 F4.1 mag/arcsec+2 SuBr0 Central surface brightness
38- 40 F3.1 arcsec Scale Exponential scalelength
42- 52 A11 --- Com Galaxy type
54- 55 A2 --- Detect [NO ND] Detection note (G1)
57- 59 F3.1 [solMass] logMHI ? HI mass
61- 65 F5.1 km/s W50 ? 50% HI velocity width
67- 71 I5 km/s VHI ? HI velocity
73- 77 I5 km/s Vopt ? Optical velocity
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 I1 --- Seq Sequential number,
[RDS2004] UMa N in Simbad
3- 4 I2 h RAh Right ascension (J2000.0)
6- 7 I2 min RAm Right ascension (J2000.0)
9- 10 I2 s RAs Right ascension (J2000.0)
12 A1 --- DE- Declination sign (J2000.0)
13- 14 I2 deg DEd Declination (J2000.0)
16- 17 I2 arcmin DEm Declination (J2000.0)
19- 20 I2 arcsec DEs Declination (J2000.0)
22- 26 F5.2 mag/arcsec+2 SuBr0 Central surface brightness
28- 30 F3.1 arcsec Scale Exponential scalelength
32- 41 A10 --- Type Type
43- 66 A24 --- Com Comments
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number,
[RDS2004] MGS unsure NN in Simbad
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10- 14 F5.2 s RAs Right ascension (J2000.0)
16 A1 --- DE- Declination sign (J2000.0)
17- 18 I2 deg DEd Declination (J2000.0)
20- 21 I2 arcmin DEm Declination (J2000.0)
23- 26 F4.1 arcsec DEs Declination (J2000.0)
28- 32 F5.2 mag/arcsec+2 SuBr0 Central surface brightness
34- 36 F3.1 arcsec Scale Exponential scalelength
38- 71 A34 --- Com Comments about the source nature
72- 73 A2 --- Detect [ND] Detection note (G1)
79- 81 F3.1 [solMass] logMHI ? HI mass
83- 85 I3 km/s W50 ? 50% HI velocity width
87- 90 I4 km/s VHI ? HI velocity
93- 97 I5 km/s Vopt ? Optical velocity
99 A1 --- n_Seq [*] *: individual notes (2)
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Note (2): Object 48 is a marginal detection that will need confirmation
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Global notes:
Note (G1): Comments as follows:
NO = not observed at 21cm
ND = observed but not detected at 21cm
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2005