Journal
ASTRONOMY & ASTROPHYSICS
Volume 609, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201731699
Keywords
galaxies: clusters: individual: A399; galaxies: clusters: individual: A401; cosmology: observations; large-scale structure of Universe
Categories
Funding
- PI Invitation Program of Institute for Advanced Research, Nagoya University
- ESA Member States
- NASA
- UK Science and Technology Facilities Council
- National Aeronautics and Space Administration
- European Research Council (ERC) under the European Union's Horizon research and innovation programme [ERC-2015-AdG 695561]
- Canada
- PI Invitation Program of Institute for Advanced Research, Nagoya University
- ESA Member States
- NASA
- UK Science and Technology Facilities Council
- National Aeronautics and Space Administration
- European Research Council (ERC) under the European Union's Horizon research and innovation programme [ERC-2015-AdG 695561]
- Canada
Ask authors/readers for more resources
We have performed a multi-wavelength analysis of two galaxy cluster systems selected with the thermal Sunyaev-Zel'dovich (tSZ) effect and composed of cluster pairs and an inter-cluster filament. We have focused on one pair of particular interest: A399-A401 at redshift z similar to 0.073 seperated by 3 Mpc. We have also performed the first analysis of one lower-significance newly associated pair: A21-PSZ2 G114.09-34.34 at z similar to 0.094, separated by 4.2 Mpc. We have characterised the intra-cluster gas using the tSZ signal from Planck and, when possible, the galaxy optical and infrared (IR) properties based on two photometric redshift catalogues: 2MPZ and WISExSCOS. From the tSZ data, we measured the gas pressure in the clusters and in the inter-cluster filaments. In the case of A399-A401, the results are in perfect agreement with previous studies and, using the temperature measured from the X-rays, we further estimate the gas density in the filament and find n(0) = (4.3 +/- 0.7) x 10(-4) cm(-3). The optical and IR colour-colour and colour-magnitude analyses of the galaxies selected in the cluster system, together with their star formation rate, show no segregation between galaxy populations, both in the clusters and in the filament of A399-A401. Galaxies are all passive, early type, and red and dead. The gas and galaxy properties of this system suggest that the whole system formed at the same time and corresponds to a pre-merger, with a cosmic filament gas heated by the collapse. For the other cluster system, the tSZ analysis was performed and the pressure in the clusters and in the inter-cluster filament was constrained. However, the limited or nonexistent optical and IR data prevent us from concluding on the presence of an actual cosmic filament or from proposing a scenario.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available