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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
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:
FileName Lrecl Records Explanations
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
See also: J/MNRAS/370/1223 : 15 nearby galaxy groups dynamical properties (Brough+, 2006) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Note (1): 'a' indicates newly detected galaxies found in follow-up ATCA data, not the original Parkes survey
Byte-by-byte Description of file: tablea.dat
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: tableb.dat
Bytes Format Units Label Explanations
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
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) 2 = Kilborn et al. (2005MNRAS.356...77K) 3 = Kilborn et al. (2006MNRAS.371..739K) 4 = Kern et al. (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.
History: From electronic version of the journal References: Brough et al., Paper I 2006MNRAS.370.1223B, Cat. J/MNRAS/370/1223
(End) Patricia Vannier [CDS] 15-Jun-2010
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