ERC Demo

This wikipage has been created to help running the clustering demo in the CosmoHub portal

1) Login to CosmoHub using the following credentials:

user: erc.cosmodark@gmail.com
password: DarkCosmo 

you will find a page with only one simulated catalog: MICECATv1.0. We have removed the rest of the public catalogs (e.g. MICECATv2.0, GAIA DR1 and DR2, etc.) to make this demo simpler.

2) Click on the name MICECAT to access the catalog.

A menu at the header to easily find the different steps of the process in order to create and analyze your custom sample.

3) For simplicity we have pre-defined three "Demos" corresponding to three different galaxy samples, which can be found in Step 0: Demos and Datasets.

4) Click on "Demo" for any of the samples (under Load column in the right side of the Step 0 section).

Once you click on Demo you will be directly redirected to "Step 4: Query", where the user can see the selected galaxy sample.

For instance, Clustering demo 1 is a volume limited galaxy sample including a cut in absolute magnitude (or luminosity):

SELECT `d_c`, `ra`, `dec` 
FROM micecatv1_0_hpix 
WHERE `z` > 0.2 AND `z` < 0.3 AND `abs_mag_r` < -21

where 3 different columns, d_c (comoving distance in Mpc/h), ra and dec (Rigth ascension and Declination in degrees), from a redshift shell (0.2 < z < 0.3) filtered by a luminosity cut (M_r - 5 log(h) < -21), are selected.

5) You can add properties to this query by selecting the desired column in Step1: Columns.

6) You can choose a random subset of the sample by going to Step 2: Sampling.

7) You can change the query by going to Step 3: Filters and impose other selection criteria.

Analysis & Preview

If you scroll to Step5: Analysis you can make Tables, Scatter Plots, Histograms and Heatmaps between the different selected columns.

• For example, under Histogram select d_c in the X axis, with (min,max) values and you can see the distribution of comoving radial distances for the sample.

Guided Task: Clustering

To run the clustering analysis for this sample you have to scroll down until Step 5b: Guided Tasks.

• Fill each of the fields in the first row with the corresponding selected columns: e.g. RA with ra, Dec with dec and r with d_c.

• In the second row define the distance separation binning (min, max) and the number of bins.

• Launch the job by clicking on the Request button, located at the bottom.

Once the job is finished you will receive an email in the erc.cosmodark@gmail.com account (accesible with password DarkCosmo) with the results.

NOTE: The clustering analysis is just a preliminary proof of concept. The HOD and Photo Z analysis are only placeholder tabs, they are not implemented in practice.

Data Download

Scroll down to Step 6: Format to select a format if you want to download a queried catalogue. Once the query finishes you will receive an email in the erc.cosmodark@gmail.com account (accesible with password DarkCosmo) with the link for download (found also under Activity).