TY - JOUR
T1 - PSZ2 G282.28+49.94, a recently discovered analogue of the famous Bullet Cluster
AU - Bartalucci, I.
AU - Rossetti, M.
AU - Boschin, W.
AU - Girardi, M.
AU - Nonino, M.
AU - Baraldi, E.
AU - Balboni, M.
AU - Coe, D.
AU - De Grandi, S.
AU - Gastaldello, F.
AU - Ghizzardi, S.
AU - Giacintucci, S.
AU - Grillo, C.
AU - Harvey, D.
AU - Lovisari, L.
AU - Molendi, S.
AU - Resseguier, T.
AU - Riva, G.
AU - Venturi, T.
AU - Zitrin, A.
N1 - Publisher Copyright:
© The Authors 2024.
PY - 2024/9/1
Y1 - 2024/9/1
N2 - We present a detailed study of the gas and galaxy properties of the cluster PSZ2 G282.28+49.94 detected in the Planck all-sky survey. The intracluster medium (ICM) of this object at z=0.56 exhibits a cometary-like shape. Combining Chandra and TNG observations, we characterised the spatially resolved thermodynamical properties of the gas and the spatial and velocity distribution of 73 galaxy members. The cluster structure is quite complex with an elongated core region containing the two brightest cluster galaxies and one dense group to the south-east. Since there is no velocity difference between the core and the south-east group, we suggest the presence of a merger along the plane of the sky. This structure is related to complex X-ray and radio features, and thus the merger has likely been caught during the post-merger phase. Comparing the distribution of the ICM and of member galaxies, we find a large offset of ~350 kpc between the position of the X-ray peak and the centre of a concentration of galaxies, preceding it in the likely direction of motion. This configuration is similar to the famous Bullet Cluster, leading us to dub PSZ2 G282.28+49.94 the 'Planck bullet', and represents an ideal situation to provide astrophysical constraints to the self-interaction cross-section (σ/m) of dark matter particles. These results illustrate the power of a multi-wavelength approach to probe the merging scenario of such complex and distant systems.
AB - We present a detailed study of the gas and galaxy properties of the cluster PSZ2 G282.28+49.94 detected in the Planck all-sky survey. The intracluster medium (ICM) of this object at z=0.56 exhibits a cometary-like shape. Combining Chandra and TNG observations, we characterised the spatially resolved thermodynamical properties of the gas and the spatial and velocity distribution of 73 galaxy members. The cluster structure is quite complex with an elongated core region containing the two brightest cluster galaxies and one dense group to the south-east. Since there is no velocity difference between the core and the south-east group, we suggest the presence of a merger along the plane of the sky. This structure is related to complex X-ray and radio features, and thus the merger has likely been caught during the post-merger phase. Comparing the distribution of the ICM and of member galaxies, we find a large offset of ~350 kpc between the position of the X-ray peak and the centre of a concentration of galaxies, preceding it in the likely direction of motion. This configuration is similar to the famous Bullet Cluster, leading us to dub PSZ2 G282.28+49.94 the 'Planck bullet', and represents an ideal situation to provide astrophysical constraints to the self-interaction cross-section (σ/m) of dark matter particles. These results illustrate the power of a multi-wavelength approach to probe the merging scenario of such complex and distant systems.
KW - Dark matter
KW - Galaxies: clusters: individual: PSZ2 G282.28+49.94
KW - Galaxies: clusters: intracluster medium
KW - Galaxies: distances and redshifts
KW - Large-scale structure of Universe
UR - http://www.scopus.com/inward/record.url?scp=85205578945&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202450468
DO - 10.1051/0004-6361/202450468
M3 - Article
AN - SCOPUS:85205578945
SN - 0004-6361
VL - 689
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A324
ER -