Cosmic Filament Catalogue
The Catalogue
The Cosmic Filament Catalogue was introduced in "A novel Cosmic Filament catalogue from SDSS data" [ArXiV] [A&A]. Please include a citation to this paper if you use this catalogue.
The filaments are detected by applying a version of the Subspace-Constrained Mean Shift boosted with Machine Learning Techniques. It has been applied to SDSS galaxy data by taking thin slices of the redshift component in a tomographic analysis. Several aspects of the catalogue, its rationale, and its validation have been explained in the paper linked above.
The catalogue is divided into 3 blocks, depending on the data used:
Block 1: using BOSS (mainly LOWZ) data, with redshift between 0.05 and 0.45. Only points in the LOWZ footprint are used, in both Galactic Hemispheres.
Block 2: using BOSS CMASS data, with redshift between 0.45 and 0.7, in both Galactic Hemispheres.
Block 3: using BOSS+eBOSS data (LRG and QSO), with redshift between 0.6 and 2.2. Only points in the smaller eBOSS footprint are used, in the North Galactic Hemisphere only.
For more information about the data, their redshift and footprints, please refer to section 3.3 of the paper, and Figures 3 to 6 within it.
Each row in the table represents a point located in a filament. The information reported for each point includes:
RA: right ascension, in degrees, in the equatorial coordinates J2000
dec: declination, in degrees, in the equatorial coordinates J2000
unc: uncertainty of the detection, in degrees. It is computed through bootstrap.
angle: the angle of the filament with the parallels of the sphere, in a counter-clockwise direction.
z_low, z_high: the redshift limits of the slice where the filament is located.
Other technical parameters are reported, as explained in the paper.
For any question or problem, do not hesitate to email me at javier.carron@roma2.infn.it.