Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519l.115p&link_type=abstract
The Astrophysical Journal, Volume 519, Issue 2, pp. L115-L118.
Astronomy and Astrophysics
Astronomy
41
Cosmology: Cosmic Microwave Background, Cosmology: Observations, Galaxies: Clusters: Individual: Alphanumeric: Rx J1347-1145, Galaxies: Intergalactic Medium
Scientific paper
We have mapped the Sunyaev-Zeldovich (SZ) decrement in the direction of the most luminous X-ray cluster known to date, RX J1347-1145, at z=0.451. This has been achieved with an angular resolution of about 23" using the Diabolo photometer running on the IRAM 30 m radio telescope. We present here a map of the cluster central region at 2.1 mm. The Comptonization parameter toward the cluster center, y_c=(12.7^+2.9_-3.1)x10^-4, corresponds to the deepest SZ decrement ever observed. Using the gas density distribution derived from X-ray data, this measurement implies a gas temperature of T_e=16.2+/-3.8 keV. The resulting total mass of the cluster is, under hydrostatic equilibrium, M(r<1 Mpc)=(1.0+/-0.3)x10^15 M_solar for a corresponding gas fraction f_gas(r<1 Mpc)=19.5%+/-5.8%.
Aghanim Nabila
Benoît Alain
Coron N.
Delabrouille Jacques
Desert François Xavier
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