A joint ALMA-Bolocam-Planck SZ study of the pressure distribution in RX J1347.5-1145. (arXiv:1812.01034v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Mascolo_L/0/1/0/all/0/1">Luca Di Mascolo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Churazov_E/0/1/0/all/0/1">Eugene Churazov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mroczkowski_T/0/1/0/all/0/1">Tony Mroczkowski</a>
We report the joint analysis of single-dish and interferometric observations
of the Sunyaev-Zeldovich (SZ) effect from the galaxy cluster RX J1347.5-1145.
We have developed a parametric fitting procedure that uses native imaging and
visibility data, and tested it using the rich data sets from ALMA, Bolocam, and
Planck available for this object. RX J1347.5-1145 is a very hot and luminous
cluster showing signatures of a merger. The presence of two almost equally
bright giant elliptical galaxies separated by $sim100;{rm kpc}$ makes the
choice of the cluster centre ambiguous, which allows for considerable freedom
in the interpretation of the merger properties. In particular, we found that
the SZ signal can be well-described by a single, smooth ellipsoidal generalised
Navarro-Frank-White profile, centred between the two brightest cluster galaxies
(BCGs) and with a core cuspiness between that derived from cool-core and
morphologically disturbed samples of clusters. This weakens considerably the SZ
amplitude of a substructure known as the `southeastern excess’ that appears
when a model centred at the X-ray peak, almost coincident with the more western
of the BCGs, is subtracted. Furthermore, the majority of features seen in the
X-ray can be explained as predominantly isobaric structures, alleviating the
need for highly supersonic velocities, although over-pressurised regions
associated with the moving subhalos are still present in our model.
We report the joint analysis of single-dish and interferometric observations
of the Sunyaev-Zeldovich (SZ) effect from the galaxy cluster RX J1347.5-1145.
We have developed a parametric fitting procedure that uses native imaging and
visibility data, and tested it using the rich data sets from ALMA, Bolocam, and
Planck available for this object. RX J1347.5-1145 is a very hot and luminous
cluster showing signatures of a merger. The presence of two almost equally
bright giant elliptical galaxies separated by $sim100;{rm kpc}$ makes the
choice of the cluster centre ambiguous, which allows for considerable freedom
in the interpretation of the merger properties. In particular, we found that
the SZ signal can be well-described by a single, smooth ellipsoidal generalised
Navarro-Frank-White profile, centred between the two brightest cluster galaxies
(BCGs) and with a core cuspiness between that derived from cool-core and
morphologically disturbed samples of clusters. This weakens considerably the SZ
amplitude of a substructure known as the `southeastern excess’ that appears
when a model centred at the X-ray peak, almost coincident with the more western
of the BCGs, is subtracted. Furthermore, the majority of features seen in the
X-ray can be explained as predominantly isobaric structures, alleviating the
need for highly supersonic velocities, although over-pressurised regions
associated with the moving subhalos are still present in our model.
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