1 observations of hipass radio galaxies with 6df michael drinkwater, melbourne (for the multibeam...
DESCRIPTION
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, fluxesTRANSCRIPT
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Observations of HIPASS radio galaxies with 6dF
Michael Drinkwater, Melbourne(for the multibeam working group) 1 The HI Parkes All-Sky Survey
HI Mass Function vs. optical morphological type Star formation efficiency vs. environment Optical counterparts for 6dF
2 Gravitational Lenses in the 6dF GS
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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
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Catalogue details
HIPASSJ0607-61
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 < VGSR < 300 reject lines at known interference freqs
Interactive checking & parameter fitting accurate velocity, widths, fluxes
![Page 4: 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](https://reader034.vdocuments.mx/reader034/viewer/2022052606/5a4d1b107f8b9ab05998e918/html5/thumbnails/4.jpg)
Example Detections
Velocity (km s-1)
Flux
Den
sity
(Jy)
HIPASS J2232-46
Velocity (km s-1)
Flux
Den
sity
(Jy)
HIPASS J2202-20
Velocity (km s-1)
Flux
Den
sity
(Jy)
HIPASS J0246-30
Velocity (km s-1)
Flux
Den
sity
(Jy)
HIPASS J1035-24
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Parameter Distributions
velocity (km s-1) width (km s-1)
peak flux (Jy) number of detections per cube
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Galaxy Distribution
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Catalogue Applications
HI Mass Function (Zwaan)
HI Column Density (Ryan-Weber)
Local Groups (Stevens)
HIP 1723-80
Group Members
Velocity (ms-1)
Flux
(Jy/
beam
)
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Catalogue Applications
• Inclination > 500 • Sb-Sc & SBb-SBc
Tully-Fisher (Meyer) Correlation Function (Tantisrisuk)
S (h Mpc)
1 +
(s)
(r/r0)-
r0 = 3.55 = 1.7
Rotational Velocity [log(v50max)]
Mag
nitu
de [
ki20
e - 5
log(
v/10
0) -2
5]
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Catalogue Applications
Unusual objects, eg no optical counterpart (Kilborn, Koribalski)
Survey sample selection, eg SINGG (Meurer et. al.)
HIP J1712-64
HIP 976 (IC5332)
Right Ascension (J2000)
Dec
linat
ion
(J20
00)
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Status Spectra on line at www.atnf.csiro.au/research/multibeam 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
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HI mass distributionLow-mass slope of HI mass
function (HIMF) HI mass function optical
luminosity function most baryonic mass in low
surface brightness HI-detected galaxies?
steeper slope than other studiesMass [log MHI/Msun]
Den
sity
[M
pc-3de
x-1]
HIMF as a function of optical morphology neutral gas morphology environment is morphology driven by formation conditions or
later interactions with environment?
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Star formation efficiency NIR + optical
Star formation past and present
HIPASS (HI) remaining fuel
star formation future
failed star formation
SF efficiency as a function of environment density-morphology relation (Dressler 1980): decrease in %
of late-type (SF) galaxies in regions of high galaxy density test models of the density-morphology relation using data
not biased by current star formation
Optical H NIR
HI total HI V HI velocity
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HIPASS 6dF Sample
Aim: optical identification of HIPASS 4 arcmin position uncertainties traditional solution: high resolution radio
imaging not realistic for 5000 sources! statistical solution: measure redshifts for all
possible matching galaxies then match by velocity
6dF: not complete but should match majority bonus: synergy with 6dF and 2MASS science
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HIPASS 6dF SampleOptical identification using 6dF redshifts
optical redshifts of any possible matches 6dF already doing galaxies R<15.7 HIPASS |b|>10 deg, Dec<0 deg; N=5800 matched to SuperCOSMOS “galaxies” N=66132
15.6<R<17 & closer than 5 arc min (Mike Read, WFAU) automatic and manual cleaning N=2710 4 peak flux limit (50 mJy) N=1195 additional target total N=717
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HIPASS matches: SuperCOSMOS R-band 1arcmin images
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Summary of outcomes
1. Optical IDs (catalogue paper III) statistical first pass using position
matches to SuperCOSMOS sky catalogues improve with colour and morphology
2. 6dF identifications (in 3-4 years) best solution using redshift matches detailed analysis of density-morphology
relation
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2. Gravitational Lenses in the 6dF GS
Rosetta Stone of lensing: QSO2237+050 (Huchra et al 1985)
lens: z=0.04 spiral galaxy
model (C. Trott): core of dark matter profile is flat, not cuspy
any of these in the 6dF GS?
total rotation curve
dark matter
disk
bulge
bar
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Gravitational Lenses in the 6dF GS
Detection statistics galaxies + magnified QSOs preferentially
selected in flux-limited galaxy surveys but QSO counts drop rapidly at brighter limits 2dF GRS (2.5 105) ~10 lensed galaxies SDSS (106) ~100 lensed galaxies
(Mortlock & Webster 2000) 6dF (105) ~1 lensed galaxies but ~10 if QSOs as red as B-K=8
(Mortlock & Drinkwater 2001)
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Gravitational Lenses in the 6dF GS
Search of 2dF GRS: search underway at Cambridge 2 good candidates: not confirmed lenses D. Mortlock, P. Hewett & D. Madgwick
Search of 6dF GS: same software will be used when 6dF data released!
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