Transcript Linear optics quantum logic gates in the real world

THE UNIVERSITY
OF QUEENSLAND
Bright & Dark Galaxies
from the HIPASS Radio Survey
Marianne T.
*1,
Doyle
1
Drinkwater ,
1
Rohde ,
Michael J.
David J.
3
Baerbel S Koribalski and The HIPASS Team
Mike
2
Read ,
1. Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
2. WFAU, Institute for Astronomy, Royal Observatory, Blackford Hill Edinburgh, EH9 3HJ, UK
3. ATNF, PO Box 76 Epping NSW 1710 Australia
* Email: [email protected]
SUMMARY
We have searched for optical counterparts for the 4315
HI Parkes All-Sky 21cm Survey (HIPASS4) detections
We used images from the SuperCOSMOS optical
southern sky survey5
We have identified 84% of the 4315 HI detected
sources
We have identified 3 possible candidates for “Dark
Galaxies”
Using the HIPASS catalogue we are investigating
Estimators of Star Formation Rates (SFR)
Star Formation Efficiency (SFE)
Dependence of Star Formation on local galaxy density
OPTICAL COUNTERPARTS FOR HIPASS SOURCES
 Input Data
 Matching Process – ADRIC
Radio:
HIPASS catalogue 1,2 - 4315 neutral hydrogen (HI)
detected sources
 Optical:
 SuperCOSMOS5: Optical images
 SExtractor6: image analysis with BRI photometry
 6dF Galaxy Survey7: velocity matching
 NED Database8: velocity matching
ADRIC: Matlab Program to display and select optical data
for each HIPASS4 source
Velocities from NED8 and the 6dF Galaxy Survey7 used to
match the HIPASS radio sources velocities to confirm optical
matches
 When no velocities were available proximity to the
HIPASS co-ordinates and other image features were used to
assist optical matching
Screen shot of the ADRIC program showing 15’ SuperCOSMOS field
centred on a HIPASS source, with published velocities in red, blue ellipses
from SExtractor catalogue (selected galaxy in yellow). The buttons classify
the selected optical counterpart (allowing cases of poor photometry due to
merged objects or poor image segmentation to be noted).
Results & Match Categories
Analysis of 4315 Radio Sources
Velocity Match
44%
With published velocity
Good Guess
20%
But no published velocity
Velocity Multi Match
Skyplot: Declination vs. Right Ascenition for HIPASS radio
source co-ordinates.
Note the concentration of “blank fields” in the Galactic Plane
14%
Compact group of galaxies with similar published velocity
Good Guess Multi Match
Log HIPASS Integrated Flux Vs Optical Apparent Blue Magnitude
from Optical matches
6%
Compact group of galaxies no velocity
No Guess
Totally independent variables. Clear correlation shown.
11%
Several galaxies no velocities
Blank Field
5%
No visible galaxy
 When Optical Matches Are Confused?
ATCA high resolution observation are carried out where possible
48 observations of “Confused Sources” completed in August 2003
A further 100 ATCA high resolution observations have been applied for
DARK GALAXIES & BLANK FIELDS
Disney9 hypothesised that the baryonic content of the
universe might be in low surface brightness galaxies know as
“Dark Galaxies”
HIPASS being a HI All-sky southern survey should find
“Dark Galaxies” if they exist
Dark Galaxies in HIPASS
HI strongly detected but no possible optical counterpart
found.
We have found 3 candidate Dark Galaxies
Will be included in follow-up ATCA high resolution
observation
Not previously observed by the ATCA
Not listed in published catalogues or literature NED8
Not high velocity clouds
3 candidate
“Dark Galaxies”
Log Integrated Radio flux vs. App. Blue
Magnitudes
• 3 candidate “Dark Galaxies” compared to optical
counterparts for HIPASS4 galaxies. These objects are
very different from the optically matched galaxies.
• Their flux puts them outside the range for the optical
matches objects
• The apparent blue magnitude limits for the matched
galaxies and SuperCOSMO5 images are 18 & 22
respectively, hence the blue magnitude for these
objects may be <22.
WHERE TO FROM HERE?
Estimators of TOTAL Star Formation Rate (SFR) to be investigated:
Radio Continuum
High resolution radio observations
Sydney University Molonglo Sky Survey SUMSS10
Reanalysis of the raw HIPASS data11
Mid Infrared
Infrared Astronomical Satellite (IRAS) mission12
Correlation of SFR with local galaxy density
ASA CONFERENCE 2004 – BRISBANE, JULY 4-8TH, 2004
ATCA HI contour map
overlaying DSS image.
The large galaxy is the
correct optical match for
the HIPASS HI detection.
HIPASSJ0546-08; Velocity=3361;
Width=103; Integrated Flux=4;
Peak Flux=0.047
HIPASSJ1638-15; Velocity=7442;
Width=192; Integrated Flux=8;
Peak Flux=0.049
HIPASSJ1946-48; Velocity=7745;
Width=134; Integrated Flux=5;
Peak Flux=0.036
References
1.
2.
3.
4.
Meyer et al., MNRAS, 350,1210 (HICAT)
Zwaan et al., MNRAS, 350, 1195 (HICAT)
Doyle et al., in preparation (HOPCAT)
Stavely-Smith et al (2001) Stavely-Smith, Lister, 2001, MNRAS, 322,
http://www.atnf.csiro.au/research/multibeam/
5. Hambly et al, 2001, MNRAS, 326,1279-1294,1295-1314,1315-1327
6. Bertin E., Arnouts S., AASS, (1996) 117, 393-404
7. Wakamatsu, K., Colless M.M., Jarrett T., Parker Q., Saunders W. and Watson F., 2002,
IAU Regional Assembly, ASP Conf. Series (in press)
8.
Madore Barry F., Helou George, Corwin Harold G. Jr.,Schmitz Marion, Wu Xiuqiv and
Bennett Judy, 1992, ADASS I ASP Conf Series, 25
9. Disney, M., 1976, Nature 263,573
10. Sadler E.M., Hunstead R.W., 2001, ASP, 232, 53
11. Barnes et al. in preparation
12. Neugebauer G., et al., 1984, ApJ, 278, L1