2MASS Tully-Fisher Survey Mapping the Mass in the Universe Tao Hong (NAOC, ICRAR, CAASTRO) 2MTF Team Large Scale Structure and Galaxy Flow Conference Quy Nhon, Vietnam, 2016-07-04 Motivation
Most of the matter is dark Map all the matter in the local universe, by measuring the peculiar velocity field. Peculiar velocity as a cosmological probe
Dark matter Mass distribution, large-scale structure Dark energy Growth rate Test cosmological models CDMCDM Constrain cosmological parameters
m , 8 Previous studies on PV field Bulk flow measurement Watkins et al., 2009 Depth ~ 50 h-1Mpc Vpec = 407 81 km/s Inconsistent with CDMCDM at >98% confidence level Weyant et al., 2011
Nusser & Davis., 2011 Depth ~ 40 h-1Mpc Vpec = 33338 km/s Consistent with CDMCDM Dai et al., 2011; Turnbull et al., 2012; Ma & Pan 2014 Previous studies on PV field Velocity power spectrum Watkins & Feldman, 2007 Constrained shape parameter
lower than, but consistent with, CMB data Multipole components of PV field Feldman, Watkins & Hudson, 2010 shear and octupole moments measured consistent with WMAP5 power spectrum Measure the Peculiar Velocity Using Tully-Fisher Relation Tully-Fisher relation provides the redshift
independent distances for spirals. v pec cz H 0 D Unbiased matter tracer Trace both visible matter and dark matter 2MASS Tully-Fisher Survey Measure Tully-Fisher (TF) distances to nearby spirals Galaxies are selected from the 2MASS Redshift Survey (2MRS)
Near Infrared magnitudes Optical redshifts High quality HI widths New observation + ALFALFA + Archival 2MTF bulk flow team Tao Hong (ICRAR/UWA, NAOC) Thomas Jarrett (University of Cape Town) Heath Jones (Monash University)
Baerbel Koribalski (ATNF) David Lagattuta (Swinburne University) Lucas Macri (Texas A&M University) Karen Masters (University of Portsmouth) Christopher Springob (ICRAR/UWA) Lister Staveley-Smith (ICRAR/UWA) Advantages of 2MTF Comparing with previous T-F surveys, we have: Uniform source selection & sky-coverage
Better sample to measure the peculiar velocity field Smaller zone of avoidance (ZoA) 2MTF goes down to b = 5 SFI++ covers to b = 15 Near Infrared magnitudes Ks, H and J band magnitudes SFI++ used optical magnitudes I band
Scientific Goal of 2MTF High quality Tully-Fisher distance catalog Test cosmological models Constrain cosmological parameters m, 8 The 2MRS velocity field Reconstruct the matter field compare with the field
from 2MRS, 6dF. Erdogdu et al., 2006 Source Selection Selection criteria Select from 2MASS Redshift Survey
Ks < 11.25 mag cz < 10,000 km/s b/a < 0.5 Morphology Selection limits on HI data w/w < 10% S/N > 5
Observations & data collection Green Bank Telescope (Masters et al., 2014) Northern sky - 40 1194 galaxies observed, 479 well detected Parkes Telescope (Hong et al., 2013) Newly observed by 2MTF team
Southern sky < - 40 305 galaxies observed, 151 well detected ALFALFA 576 galaxies used (final ALFALFA has been included in 2016) Archival data 1502 galaxies collected (mainly from Cornell archive)
Bulk Flow estimation Least 2 fitting with Gaussian windows Depth at 20, 30 and 40 h-1Mpc Fitting in the log-normal space Malmquist bias corrected Error estimated by Jackknife method Also adopted Maximum Likelihood Method (MLE; Kaiser 1998) & Minimum Variance method (MV; Watkins et al., 2009, Feldman et al., 2010)
Bulk Flow estimation Direction of the bulk flow Hong et al., 2014 Bulk Flow estimation Amplitude of the bulk flow Disagreement between previous results
Bulk Flow estimation Amplitude of the bulk flow Measured by 2MTF with 2 method Hong et al., 2014 Bulk Flow estimation Compare with previous studies Bulk Flow estimation
Amplitude of the bulk flow Measured by 2MTF with minimum variance method Hong et al., 2014 Next steps Final ALFALFA data added 2062 2MTF galaxies after applying all criteria Next steps
Final ALFALFA data added 2062 2MTF galaxies after applying all criteria Bulk flow estimation for the full sample Next steps Final ALFALFA data added 2062 2MTF galaxies after applying all criteria Bulk flow estimation for the full sample
Multipole fitting applied on the sample Data availability 2MASS/2MRS data published New GBT/Parkes data published Masters+ 2014; Hong+ 2013 ALFALFA mostly published online Peculiar velocities will be published later on: ict.icrar.org/2MTF
to accompany final bulk flow paper in 2017 Conclusions 2MASS Tully-Fisher Survey More uniform sky-coverage Straightforward selection criteria Smaller Zone of Avoidance Distances for nearby spirals using T-F relation Good sample for cosmological studies
Highly accurate bulk flow estimate Measurements indicate consistency with CDMCDM Full sample has been completed Further analysis ongoing
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