J/MNRAS/400/1962 Southern GEMS groups. II. (Kilborn+, 2009)
Southern GEMS groups.
II. HI distribution, mass functions and HI deficient galaxies.
Kilborn V.A., Forbes D.A., Barnes D.G., Koribalski B.S., Brough S., Kern K.
<Mon. Not. R. Astron. Soc., 400, 1962-1985 (2009)>
=2009MNRAS.400.1962K 2009MNRAS.400.1962K
ADC_Keywords: Clusters, galaxy ; Galaxies, nearby ; H I data ; Radial velocities
Keywords: galaxies: clusters: general - galaxies: evolution -
galaxies: interactions -
galaxies: luminosity function, mass function - X-rays: galaxies
Abstract:
We investigate the neutral hydrogen (HI) content of 16 groups for
which we have multiwavelength data including X-ray observations.
Wide-field imaging of the groups was obtained with the 20cm multibeam
system on the 64m Parkes telescope. We have detected 10 previously
uncatalogued HI sources, one of which has no visible optical
counterpart. We examine the HI properties of the groups, compared to
their X-ray characteristics, finding that those groups with a higher
X-ray temperature and luminosity contain less HI per galaxy.
Description:
The full GEMS (Group Evolution Multi-wavelength Study) sample
includes 60 galaxy groups, chosen from 10 optical catalogues, the
majority with recession velocities between 1000 and 3000km/s and with
a ROSAT PSPC (position sensitive proportional counter) exposure time
of more than 10000s within 20-arcmin of the group position.
We chose 16 groups that were near or south of declination 0°,
for wide-field HI imaging at Parkes. The groups selected for HI
observations have a variety of X-ray properties, from just the central
galaxy being detected (six groups), to diffuse group-scale X-ray
emission (eight groups), to no X-ray detection at all (two groups).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 57 16 Summary of the HI observations and results
tablea.dat 99 204 HI detections of the galaxies in groups
tableb.dat 106 259 Optical counterparts to the HI detections
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See also:
J/MNRAS/370/1223 : 15 nearby galaxy groups dynamical properties (Brough+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Group Group abbreviation
8- 15 A8 --- Name Group name
17- 18 I2 h RAh Central HI cube Right ascension (J2000)
20- 21 I2 min RAm Central HI cube Right ascension (J2000)
23 A1 --- DE- Central HI cube Declination sign (J2000)
24- 25 I2 deg DEd Central HI cube Declination (J2000)
27- 28 I2 arcmin DEm Central HI cube Declination (J2000)
30- 33 I4 km/s Vsys Central velocity of the group
35- 38 F4.1 Mpc Dist Distance to the group from Brough et al.
(2006, Cat. J/MNRAS/370/1223)
40- 41 I2 h Time Approximate integration time
43- 46 F4.1 mJy.km/s rms rms noise per channel in the final HI cube,
smoothed to a velocity resolution of 13.2km/s
48- 49 I2 mJy Det ? Detectability of synthetic Gaussian sources
as described in the text (in mJy/beam)
51- 52 I2 --- NHI Number of HI detections
54 I1 --- New Number of previously uncatalogued (new)
detections
55 A1 --- n_New [a] Not detected in Parkes survey (1)
57 I1 --- Newz Number of new redshifts of previously
catalogued galaxies
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Note (1): 'a' indicates newly detected galaxies found in follow-up
ATCA data, not the original Parkes survey
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Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GEMS_]
6- 14 A9 --- GEMS HI designation ([BFK2006] GEMS in Simbad)
15 A1 --- n_GEMS [a] Duplicated source (1)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 27 F6.3 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 41 F6.3 arcsec DEs Declination (J2000)
43- 46 I4 km/s Vsys Systemic velocity of source
48- 49 I2 km/s e_Vsys rms uncertainty on Vsys
51- 53 I3 km/s V20 HI linewidth of source at 20% of the peak
55- 56 I2 km/s e_V20 rms uncertainty on V20
58- 60 I3 km/s V50 HI linewidth of source at 50% of the peak
62- 63 I2 km/s e_V50 rms uncertainty on V50
65- 69 F5.3 Jy Sp HI peak flux
71- 75 F5.3 Jy e_Sp rms uncertainty on Speak
77- 82 F6.2 Jy.km/s Ftot Total HI flux
83- 87 F5.2 Jy.km/s e_Ftot rms uncertainty on Ftot
89- 94 F6.2 10+8Msun MHI HI mass (2)
96- 99 F4.2 10+8Msun e_MHI rms uncertainty on MHI
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Note (1): Three sources from the NGC 1407 group were also detected in the
NGC 1332 group:
GEMSN14071 = GEMSN13322;
GEMSN14073 = GEMSN13323;
GEMSN14074 = GEMSN13325.
These sources are listed in both groups so the reader can compare
and contrast the derived values.
Note (2): assuming group distance as given in Table 2
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Byte-by-byte Description of file: tableb.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [GEMS_]
6- 14 A9 --- GEMS HI designation ([BFK2006] GEMS in Simbad)
15- 17 A3 --- r_GEMS ATCA observations reference (1)
18 A1 --- f_GEMS [*] not confirmed optical counterpart (2)
20- 23 I4 km/s Vsys Systemic velocity derived from HI spectrum
25- 28 F4.2 arcmin Dist ? Distance of HI source position from
optical galaxy position
30- 59 A30 --- OName Name of optical galaxy
62- 76 A15 --- 6dFGS 6dFGS name (JHHMMSSs+DDMMSS, Cat. VII/259)
78- 79 I2 h RAh ? Optical source right ascension (J2000)
81- 82 I2 min RAm ? Optical source right ascension (J2000)
84- 88 F5.2 s RAs ? Optical source right ascension (J2000)
90 A1 --- DE- Optical source declination sign (J2000)
91- 92 I2 deg DEd ? Optical source declination (J2000)
94- 95 I2 arcmin DEm ? Optical source declination (J2000)
97-100 F4.1 arcsec DEs ? Optical source declination (J2000)
102-105 I4 km/s Vopt ? Systemic velocity of optical source
106 A1 --- n_Vopt [*] * when velocity is a previous HI
measurement associated with this galaxy
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Note (1): Sources have ATCA observations, and thus a confirmed optical
counterpart (except in the case of GEMSN37832 where no optical
counterpart is seen). The references are as follows:
1 = McKay et al. (2004MNRAS.352.1121M 2004MNRAS.352.1121M)
2 = Kilborn et al. (2005MNRAS.356...77K 2005MNRAS.356...77K)
3 = Kilborn et al. (2006MNRAS.371..739K 2006MNRAS.371..739K)
4 = Kern et al. (2008MNRAS.384..305K 2008MNRAS.384..305K)
Note (2): the * indicates that previously catalogued optical counterpart
is further than 8arcmin from the central HI position. Confirmation
of optical counterpart is required.
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History:
From electronic version of the journal
References:
Brough et al., Paper I 2006MNRAS.370.1223B 2006MNRAS.370.1223B, Cat. J/MNRAS/370/1223
(End) Patricia Vannier [CDS] 15-Jun-2010