1 Observations of HIPASS radio galaxies with 6dF Michael Drinkwater, Melbourne (for the multibeam working group) z 1 The HI Parkes All-Sky Survey y HI Mass Function vs. optical morphological type y Star formation efficiency vs. environment y Optical counterparts for 6dF z 2 Gravitational Lenses in the 6dF GS

2 Catalogue Properties (Kilborn 2001) HIPASS: 21cm line neutral hydrogen  < +2 [  < +22 northern]  1200  12,700 kms -1 ~13 mJy RMS Expect ~5200 detections, cf: ZOA ~1000, BGals 1000, SC ~500 Rosenburg & Schneider (2000): 265 Spitzak & Schneider (1998): 75 Henning (1995): 37

3 Catalogue details HIPASSJ  Two algorithms to detect candidates:  Artificial sources added to measure completeness  ‘MultiFind’ (Kilborn): 4  peak flux detection  detection in 2 adjacent velocity planes  Hanning smooth, repeat  2  ‘TopHat’ (Howlett)  cross correlate spectra with top hat filter  repeat: filter sizes 1-40 velocity channels  Candidate lists merged  Automatic cleaning  reject -300 < V GSR < 300  reject lines at known interference freqs  Interactive checking & parameter fitting  accurate velocity, widths, fluxes

Example Detections Velocity (km s -1 ) Flux Density (Jy) HIPASS J Velocity (km s -1 ) Flux Density (Jy) HIPASS J Velocity (km s -1 ) Flux Density (Jy) HIPASS J Velocity (km s -1 ) Flux Density (Jy) HIPASS J

Parameter Distributions velocity (km s -1 )width (km s -1 ) peak flux (Jy)number of detections per cube

Galaxy Distribution

7 Catalogue Applications  HI Mass Function (Zwaan)  HI Column Density (Ryan-Weber)  Local Groups (Stevens) HIP Group Members Velocity (ms -1 ) Flux (Jy/beam)

8 Catalogue Applications Inclination > 50 0 Sb-Sc & SBb-SBc  Tully-Fisher (Meyer)  Correlation Function (Tantisrisuk) S (h Mpc) 1 +  (s)  (r/r 0 ) -  r 0 = 3.55  = 1.7 Rotational Velocity [log(v 50max )] Magnitude [ki20e - 5log(v/100) -25]

9 Catalogue Applications  Unusual objects, eg no optical counterpart (Kilborn, Koribalski)  Survey sample selection, eg SINGG (Meurer et. al.) HIP J HIP 976 (IC5332) Right Ascension (J2000) Declination (J2000)

10  Status  Spectra on line at   draft catalogue completed  Papers in preparation  I. Parkes HI Catalogue  II. Completeness Analysis  III. Optical properties  15 arcmin beam  4 arcmin position errors  high resolution ATCA image OR optical redshift Catalogue Status

11 HI mass distribution zLow-mass slope of HI mass function (HIMF) yHI mass function  optical luminosity function ymost baryonic mass in low surface brightness HI-detected galaxies? ysteeper slope than other studies Mass [log M HI /M sun ] Density [Mpc -3 dex -1 ] zHIMF as a function of optical morphology yneutral gas  morphology  environment yis morphology driven by formation conditions or later interactions with environment?

12 Star formation efficiency zNIR + optical yStar formation past and present zHIPASS (HI) yremaining fuel  star formation future yfailed star formation zSF efficiency as a function of environment ydensity-morphology relation (Dressler 1980): decrease in % of late- type (SF) galaxies in regions of high galaxy density ytest models of the density-morphology relation using data not biased by current star formation Optical H  NIR HI total HI  V HI velocity

13 HIPASS 6dF Sample zAim: optical identification of HIPASS y4 arcmin position uncertainties ytraditional solution: high resolution radio imaging ynot realistic for 5000 sources! ystatistical solution: measure redshifts for all possible matching galaxies then match by velocity y6dF: not complete but should match majority ybonus: synergy with 6dF and 2MASS science

14 HIPASS 6dF Sample zOptical identification using 6dF redshifts yoptical redshifts of any possible matches y6dF already doing galaxies R<15.7 yHIPASS |b|>10 deg, Dec<0 deg;N=5800 ymatched to SuperCOSMOS “galaxies” N=66132 x15.6<R<17 & closer than 5 arc min (Mike Read, WFAU) yautomatic and manual cleaningN=2710 y4  peak flux limit (50 mJy)N=1195 yadditional target total N=717

15 HIPASS matches: SuperCOSMOS R-band 1arcmin images

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17 Summary of outcomes z1. Optical IDs (catalogue paper III) ystatistical first pass using position matches to SuperCOSMOS sky catalogues yimprove with colour and morphology z2. 6dF identifications (in 3-4 years) ybest solution using redshift matches ydetailed analysis of density-morphology relation

2. Gravitational Lenses in the 6dF GS zRosetta Stone of lensing: yQSO y(Huchra et al 1985) ylens: z=0.04 spiral galaxy ymodel (C. Trott): ycore of dark matter profile is flat, not cuspy yany of these in the 6dF GS? total rotation curve dark matter disk bulge bar

19 Gravitational Lenses in the 6dF GS zDetection statistics ygalaxies + magnified QSOs preferentially selected in flux-limited galaxy surveys ybut QSO counts drop rapidly at brighter limits y2dF GRS ( )  ~ 10 lensed galaxies ySDSS (10 6 )  ~ 100 lensed galaxies x(Mortlock & Webster 2000) y6dF (10 5 )  ~ 1 lensed galaxies ybut ~ 10 if QSOs as red as B-K=8 x(Mortlock & Drinkwater 2001)

20 Gravitational Lenses in the 6dF GS zSearch of 2dF GRS: ysearch underway at Cambridge y2 good candidates: not confirmed lenses yD. Mortlock, P. Hewett & D. Madgwick zSearch of 6dF GS: ysame software will be used ywhen 6dF data released!