TY - JOUR
T1 - 2MTF - IV. A bulk flow measurement of the local Universe
AU - Hong, Tao
AU - Springob, Christopher M.
AU - Staveley-Smith, Lister
AU - Scrimgeour, Morag I.
AU - Masters, Karen L.
AU - Macri, Lucas M.
AU - Koribalski, Bärbel S.
AU - Jones, D. Heath
AU - Jarrett, Tom H.
N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 the Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
PY - 2014/10/8
Y1 - 2014/10/8
N2 - Using the 2MASS near-infrared photometry and high-signal-to-noise HI 21-cm data from the Arecibo, Green Bank, Nancay, and Parkes telescopes, we calculate the redshift-independent distances and peculiar velocities of 2018 bright inclined spiral galaxies over the whole sky. This project is part of the 2MASS Tully-Fisher survey (2MTF), aiming to map the galaxy peculiar velocity field within 100 h-1 Mpc, with an all-sky coverage apart from Galactic latitudes |b|<5°. A x2 minimization method was adopted to analyse the Tully-Fisher peculiarvelocity field in J, H, and K bands, using a Gaussian filter. We combine information from the three wavebands, to provide bulk flow measurements of 310.9 ± 33.9 , 280.8 ± 25.0, and 292.3 ± 27.8 km s-1 at depths of 20, 30, and 40 h-1 Mpc, respectively. Each of these bulk flow vectors points in a direction similar to those found by previous measurements. At each of the three depths, the bulk flow magnitude is consistent with predictions made by the Λ cold dark matter (ΛCDM) model at the 1σ level. The maximum likelihood and minimum variance method were also used to analyse the 2MTF samples, giving similar results.
AB - Using the 2MASS near-infrared photometry and high-signal-to-noise HI 21-cm data from the Arecibo, Green Bank, Nancay, and Parkes telescopes, we calculate the redshift-independent distances and peculiar velocities of 2018 bright inclined spiral galaxies over the whole sky. This project is part of the 2MASS Tully-Fisher survey (2MTF), aiming to map the galaxy peculiar velocity field within 100 h-1 Mpc, with an all-sky coverage apart from Galactic latitudes |b|<5°. A x2 minimization method was adopted to analyse the Tully-Fisher peculiarvelocity field in J, H, and K bands, using a Gaussian filter. We combine information from the three wavebands, to provide bulk flow measurements of 310.9 ± 33.9 , 280.8 ± 25.0, and 292.3 ± 27.8 km s-1 at depths of 20, 30, and 40 h-1 Mpc, respectively. Each of these bulk flow vectors points in a direction similar to those found by previous measurements. At each of the three depths, the bulk flow magnitude is consistent with predictions made by the Λ cold dark matter (ΛCDM) model at the 1σ level. The maximum likelihood and minimum variance method were also used to analyse the 2MTF samples, giving similar results.
UR - http://www.scopus.com/inward/record.url?scp=84913608201&partnerID=8YFLogxK
U2 - 10.1093/mnras/stu1774
DO - 10.1093/mnras/stu1774
M3 - Article
AN - SCOPUS:84913608201
SN - 0035-8711
VL - 445
SP - 402
EP - 413
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -