1. The H ICAT Optical Catalogue H OPCAT Marianne T. Doyle Ph.D. Project

2. Content Input Data Matching Process Magnitude Calibration Results Candidate Dark Galaxies? Supervisor: Michael J. Drinkwater – UQ Assoc. Supervisors: Elaine Sadler – Uni Sydney John Ross - UQ Collaborators David J. Rohde - UQ Mike Read – WFAU Edinburgh Baerbel Koribalski – ATNF, Epping HIPASS Team – ATNF Parkes & Epping, Universities of : Melbourne, Cardiff, Western Sydney Macarthur, Wales, Swinburne, Technology Sydney, New Mexico, Manchester, Colorado, Sydney, Leicester ASTRON The Netherlands, AAO Sydney, WIYN Tucson etc….......

3. RADIO DATA H IPASS Catalogue - H ICAT - 4315 radio HI detected sources Meyer et. Al 2004 (Paper I ) & Zwaan et. Al 2004 (Paper II ) OPTICAL IMAGES SuperCOSMOS 15’ x 15’ Images 7’ radius Radio-Optical position uncertainty IMAGE ANALYSIS SExtractor Image Analysis SuperCOSMOS data catalogue? Ellipse segmentation problem for extended objects SExtractor Segmentation problems? Used 2 sets of ellipse analysis parameters Input Data Radio-Optical Position Uncertainty

4. Input Data Velocities to Confirm Optical Matches NED (NASA/IPAC Extragalactic Database) Only optical and high resolution radio measured velocities used 6dFGS Non-public data as at 4th September, 2003 Hicat sources were included in survey

5. Matching Process ADRIC Interactive Program written by David Rohde Find optical counterpart by choosing galaxy ellipse by: Confirming HICAT velocities with published velocities Without velocity confirmation Only galaxy in image Proximity to HICAT position Velocity width …. Visually matched by 3 people Marianne Doyle Michael Drinkwater David Rohde

6. Superimposed ellipses Yellow for correct match 15 x 15 arcmin images to allow for the 7 arcmin position uncertainty Centred on HICAT positions Selection parameters Original HICAT parameters Superimposed and listed Published velocities

7. Magnitude Calibration SuperCOSMOS data catalogue - Calibrated SExtractor magnitudes - Uncalibrated Use the relationship between the SuperCOSMOS & SExtractor magnitudes for calibration SuperCOSMOS Plate to Plate differences/Zero-point calibration Analysed every object of 4315 blue images Matched Galaxies To calculate magnitude calibration values

8. Velocity Match 44% 1882 With published velocity Good Guesses 20% 851 But no published velocity Velocity Multi Match 14% 634 Compact group of galaxies with published velocity Good Guess Multi Match 6% 256 Compact group of galaxies no velocity No Guess 11% 476 Several galaxies no velocities Blank Field 5% 216 No visible galaxy Results Analysis of 4315 Radio Sources - 84% identified

9. Log HIPASS Peak Flux Vs Optical Apparent Magnitude Objects matched by published velocities, educated guesses without velocity and velocity matches where multiple galaxies match. Integrated Radio flux and Apparent Blue Magnitudes Totally independent variables Correlation shown Higher the blue magnitude - Higher Radio Flux

10. H ICAT Vs H OPCAT Position Uncertainties Difference between Radio and Optical Positions Velocity Matched Position difference between the synthetic point sources & the fitted position after parameterization (Zwaan et.al 2004)

11. Extinction Cut at 0.6 Candidate Dark Galaxies? 65 Possible but 58 in crowded fields 7 possible candidates for dark galaxies? 1 possibly HVC with ATCA Observation by Rachel Webster HIPASSJ1351-46 Vel=528 km s -1 (C638) 2 previously observed at ATCA by Bärbel Koribalski HIPASSJ0940-42 Vel = 2268 km s -1 (C942) HIPASSJ0902-40 Vel = 1636 km s -1 (C781) 4 remaining H ICAT NameVelocity (km s -1) Extinction (Schlegel) HIPASSJ1946-48 7730 0.0402 HIPASSJ1317-73 5666 0.286 HIPASSJ0643-16 2797 0.5503 HIPASSJ1638-15 7457 0.5096

12. HIPASSJ1946-48 B=349.7205˚ L=-28.8053˚ Vel=7730 km s -1 Ext= 0.0402 M HI =1.3x10 10 M solar

13. Optical matching process Completed HOPCAT Use Infrared & Radio Continuum to measure SFR Determine local galaxy density ATCA 21cm high resolution observation Feb 24-27 & March 3-9 2005 178.5 hours All helpers with observing welcome!!!! What’s Next Calculate SFE & relate to galaxy morphology Determine which theory contributes toward the Morphology- density relation

14. Lagoon Nebula 100LY across Contains many young stars & hot gas Thank you for your attention

15. Difference between Radio and Optical Positions for Velocity Matches Difference between Radio and Optical Positions for Good Guesses Radio-Optical Separations 50

16. Radio-Optical Separations 50 Difference between Radio and Optical Positions for Velocity Matches Difference between Radio and Optical Positions for Multiple Velocity & Good Guesses Matches

17. HI Peaks Optical Peak Position Radio-Optical Position Difference

18. Candidate Dark Galaxies? Hipass Name Ra (h:m:s) Dec (d:m:s) vel_mom (km s -1) Sint (Jy kms -1) l (degree) b (degree)Extinction Density to 10 th Galaxy (Gal/deg 2 ) Mass HI (M solar ) HIPASSJ1317-7313:17:40.3-73:09:425666.73.8304.8596-10.38820.2860.01845.7E+09 HIPASSJ1946-4819:46:05.4-48:54:357730.44.8349.7205-28.80530.04022.59391.3E+10 HIPASSJ1351-46 (HVC)13:51:18.9-46:58:25528.83.5313.429414.6740.14360.09944.6E+07 HIPASSJ0940-42 (ATCA)09:40:16.8-42:56:562268.74.8269.79967.29580.49380.01741.2E+09 HIPASSJ0902-40 (ATCA)09:02:02.6-40:06:401636.612.2262.71544.21260.55860.01121.5E+09 HIPASSJ0643-1606:43:59.0-16:07:332797.68.5226.5693-8.88490.55030.02423.1E+09 HIPASSJ1638-1516:38:02.9-15:37:487457.28.52.04720.38290.50960.19552.2E+10

19. HIPASSJ1317-73 b = 304.8596˚ l = -10.3882˚ Vel=5666 km s -1 Ext= 0.286 M HI =5.7x10 9 M solar

20. HIPASSJ0643-16 b = 226.5693˚ l = -8.8849 ˚ Vel =2797 km s -1 Ext = 0.5503 M HI =3.1x10 9 M solar

21. HIPASSJ1638-15 b = 2.047˚ l = 20.3829˚ Vel=7457 km s -1 Ext= 0.5096 M HI 2.2x10 10 M solar