Low-amplitude clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities
نویسندگان
چکیده
منابع مشابه
The 2dF Galaxy Redshift Survey: the clustering of galaxy groups
We measure the clustering of galaxy groups in the 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue. The 2PIGG sample has 28 877 groups with at least two members. The clustering amplitude of the full 2PIGG catalogue is weaker than that of 2dFGRS galaxies, in agreement with theoretical predictions. We have subdivided the 2PIGG catalogue into samples that span a factor of ≈ 25 in median ...
متن کاملThe 2dF Galaxy Redshift Survey: Hierarchical galaxy clustering
We use the two-degree field Galaxy Redshift Survey (2dFGRS) to test the hierarchical scaling hypothesis: namely, that the p-point galaxy correlation functions can be written in terms of the two point correlation function or variance. This scaling is expected if an initially Gaussian distribution of density fluctuations evolves under the action of gravitational instability. We measure the volume...
متن کاملThe 2dF Galaxy Redshift Survey: Luminosity dependence of galaxy clustering
We investigate the dependence of the strength of galaxy clustering on intrinsic luminosity using the Anglo-Australian two degree field galaxy redshift survey (2dFGRS). The 2dFGRS is over an order of magnitude larger than previous redshift surveys used to address this issue. We measure the projected two-point correlation function of galaxies in a series of volume-limited samples. The projected c...
متن کاملClustering Studies with the 2dF Galaxy Redshift Survey
The 2dF Galaxy Redshift Survey has now been completed and has mapped the three-dimensional distribution, and hence clustering, of galaxies in exquisite detail over an unprecedentedly large (∼ 108 h−3 Mpc3) volume of the local Universe. Here we highlight some of the major results to come from studies of clustering within the survey: galaxy correlation function and power spectrum analyses and the...
متن کاملParameterisation of Galaxy Spectra in the 2dF Galaxy Redshift Survey
The 2dF Galaxy Redshift Survey has already yielded over 135,000 galaxy spectra (out of the planned 250,000). We present a method for the parameterisation of galaxy spectra in the 2dF and other large redshift surveys using a new continuous parameter η = 0.44pc1 − pc2, based on a Principal Components Analysis (where pc1 and pc2 are the projections onto the first and second principal components re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty346