Cluster pairs detected with Planck SZ data

h1. Cluster pairs detected with Planck SZ data

h2. General catalog information

Here is the catalog: attachment:Jennifer_SCS_catalog.fits It was created by Jennifer during a traineeship at the IAS in summer 2018 and with the help of Victor and Marian. Here are two talks about her work: attachment:jennifer_malta_slides.pdf (English) and attachment:201806-OrsayIAS-Jennifer-Scott.pdf (French)

There is no proper documentation about the catalog so far. (*FIND IT*)

Selection of galaxy cluster pairs (copy from talk):
 * 71 pairs from SZ cluster database + 25 pairs in Planck Collaboration Filaments paper (2013)
 * Same selection conditions: ∆z < 0. 01, Angular Separation [arcmin]: 30 - 120
 * R500 values directly from MCXC for Planck clusters (comparing coordinates)
 * Total: 87 pairs

h3. Sky coverage (Galactic coordinates, mollweide projection)

!J18_skymap.png!

h3. Redshift and angular separation distribution !J18_z_vs_AngSep_Scat2Hist.png!


 * _. !L02_z_vs_galaxies_per_SC.png! |_. !L02_z_vs_groups_per_SC.png! |

h2. X-ray coverage by XMM-Newton

h3. Survey selection parameters

General note: XMM-Newton (short: XMM) FOV radius = ~15arcmin

Search criteria:
 * the "XMM-Newton Science Archive Search":https://nxsa.esac.esa.int/nxsa-web is used to select all public observations, where their FOV _intersects_ with a the following regions: the R500 region of each cluster and a connecting _filament region_
 * Filament region: It's a quadrangle between both R500 regions. Its length is defined by the smallest separation of both R500 regions. It's width at each end is defined by R500 diameter of the connecting cluster.
 * For overlapping R500 regions no filament region is used.

h3. Sky patch of pairs

List of figures:
 * 1) Shows *all* pairs (ordered as in the original catalog): attachment:Cat_Jennifer.pdf
 * 2) Shows only pairs, which have *at least 3* XMM observations: attachment:Cat_Jennifer_withXMM.pdf
 * 3) Same as before but also shows the contours of RASS: attachment:Cat_Jennifer_withXMM_RASS.pdf
 * RASS = ROSAT all-ksy survey map ("CDS/P/RASS":https://alasky.u-strasbg.fr/RASS/properties):

Legend of the figures:
 * in equatorial coordinates
 * Gray circles: R500 region
 * Green quadrangle: Filament region (see definition above).
 * Red color means that the R500 regions are overlapping and no filament region is used.
 * Blue transparent circles: the position and the possible extend of XMM observations
 * (assuming a circle shaped FOV with a radius of 15arcmin).
 * Gray contours: RASS

h3. Selection of interesting candidates

Optimal coverage:
 * 47.Pair: PSZ2 G311.98+30.71 + PSZ2 G313.33+30.29: *great* coverage, filament length = 23', z=0.05

Decent partial coverage (_XMM proposal candidate?_):
 * 72.Pair: A2029 + A2033: 1st cluster and filament (length = 3') have good coverage, 2nd cluster misses just one observation, z=0.08 but it is a rather close pair
 * 50.Pair: PSZ2 G011.36+49.42 + PSZ2 G012.81+49.68: clusters have good coverage but filament (length = 8') is missing just one observation, z=0.04

Close pairs with good coverage (close = R500 region overlapping):
 * 14.Pair: PSZ2 G164.31-39.46 + PSZ2 G164.18-38.88
 * 30.Pair: PSZ2 G262.36-25.15 + PSZ2 G263.19-25.19
 * 82.Pair: A3530 + A3532
 * 85.Pair: NPM1G+30.0 + RXJ
 * 81.Pair: A3528N + A3528S (very close = center of one cluster is within the R500 region of the other)


 * Just X-ray observations (blue circles) | plus RASS contours |
 * !P47_XMM.png! | !P47_XMM_RASS.png! |
 * !P50_XMM.png! | !P50_XMM_RASS.png! |
 * !P72_XMM.png! | !P72_XMM_RASS.png! |
 * !P30_XMM.png! | !P30_XMM_RASS.png! |


 * TODO*: check literature for all candidates