Transcript Linear optics quantum logic gates in the real world

THE UNIVERSITY
OF QUEENSLAND
Star Formation Efficiency and Environment
Marianne T.
*1,
Doyle
1
Drinkwater ,
1
Rohde ,
David J.
Michael J.
Mike
3
Koribalski and The HIPASS Team
2
Read ,
Baerbel S
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
OPTICAL COUNTERPARTS OF HIPASS SOURCES
New HIPASS Optical Catalogue (HOPCAT)
 Optical counterparts for the HI Parkes All-Sky 21cm
Survey (HIPASS) (1) have been identified using
SuperCOSMOS optical sky survey images
 Input Data
Radio:
HIPASS catalogue (HICAT) (2) - 4329 sources
 Optical:
 SuperCOSMOS (3): Optical images
 SExtractor (4): new image catalogue with BRI
photometry
 6dF Galaxy Survey (5): velocity matching
 NED Database (6): velocity matching
Using the new optical sample we will investigate
Estimators of Star Formation Rates (SFR)
Dependence of Star Formation on local galaxy density
 Matching Process –
ADRIC
ADRIC: Matlab Program to display and select
optical data for each HIPASS source
Velocities from the NED Database and the 6dF
Galaxy Survey were used to match those for the
HIPASS radio sources 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
Log HIPASS Peak Flux Vs Optical Apparent Magnitude
for objects matched by velocities from NED and 6dF,
educated guesses without velocity match and velocity
matches where multiple galaxies match.
Results
Analysis of 4329 Radio Sources
78% identified
Velocity Match
57%
With published velocity
Good Guesses
10%
But no published velocity
Multi Match
11%
Compact group of galaxies
No Guess
15%
Several galaxies no velocities
Blank Field
7%
Screen shot of the ADRIC program showing 15’ SuperCOSMOS field centred on a HICAT source, with
published velocities in red, blue ellipses from SExtractor catalogue (selected galaxy in purple). The
buttons classify the selected optical counterpart (allowing cases of poor photometry due to merged
objects or poor image segmentation to be noted).
Log Mass HI Vs Log Luminosity for objects matched by
velocities from NED and 6dF, educated guesses
without velocity match and velocity matches where
multiple galaxies match.
Skyplot of the position of each HIPASS radio source co-ordinates. Note the
concentration of “blank fields” in the Galactic Plane.
Position offsets: Radio - Optical
Position offset (RA) vs Peak Radio Flux
Velocity offsets: Radio – Optical vs Peak Flux
STAR FORMATION AND ENVIRONMENT
Star Formation
Estimators
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Future Work
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-0.2
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B-R
6dF Hα Equivalent Width Vs B-R
References
1.
2.
3.
4.
5.
Stavely-Smith et al (2001) Stavely-Smith, Lister, 2001, MNRAS, 322,
Zwaan & Meyer et al (in preparation)
Hambly et al, 2001, MNRAS, 326,1279-1294,1295-1314,1315-1327
Bertin E., Arnouts S., AASS, (1996) 117, 393-404
Wakamatsu, K., Colless M.M., Jarrett T., Parker Q., Saunders W. and Watson F.,
2002, IAU Regional Assembly, ASP Conf. Series (in press)
6. Madore Barry F., Helou George, Corwin Harold G. Jr.,Schmitz Marion, Wu Xiuqiv
and Bennett Judy, 1992, ADASS I ASP Conf Series, 25
Background: M83: The Southern Pinwheel Galaxy from VLT, FORS Team, 8.2-meter
VLT, ESO, http://antwrp.gsfc.nasa.gov/apod/ap030511.html
0.6
Estimators of TOTAL Star Formation Rate
to be investigated:
Radio Continuum
High resolution radio observations
HIPASS continuum catalog in
preparation
Mid Infrared
Correlation of SFR with local galaxy
density
Tentative evidence that galaxies in highdensity regions are redder (see figure)
3.5
3
2.5
(Local/HIPASS) Density
)
Alpha
Log Eq Width (H
 Hα emission line equivalent width from 6dF
Galaxy Survey
shows expected weak correlation with colour
6dF spectra measured using 7 arcsec fibres
Measure only the centre of the galaxy
6
2
1.5
1
0.5
0
-1.5
-1
-0.5
0
0.5
1
B-R
Density Ratio Vs B-R for 6dF Galaxy Survey
observation -22< dec <-42.
Density ratio: ratio of galaxy density within a
10MParsec radius for each optically matched galaxy to
the galaxy density of HICAT within 5MParsec radius
volumes
IAU SYMPOSIUM 216 - MAPS OF THE COSMOS – 14 -17 JULY XXV\TH GENERAL ASSEMBLY, SYDNEY JULY 13-26, 2003