A dataset provided by the European Space Agency

Name: Probing the Merger in ACT-CL J0256.5+0006: Understanding Low-Power Radio Halos
Published: 2018-09-11T22:00:00Z

Proposal ID	080161
Title	Probing the Merger in ACT-CL J0256.5+0006: Understanding Low-Power Radio Halos
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0801610101
DOI	https://doi.org/10.5270/esa-czit0er
Principal Investigator, PI	Prof Craig Sarazin
Abstract	ACT-CL J0256.5+0006 (J0256) is a moderate redshift (z=0.363) merging cluster. Werecently detected a cluster giant radio halo which is one of the weakest known.Based on our ACT SZ detection and an existing very short XMM observation, J0256has the weakest SZ and possibly the lowest mass ever observed for a radio halo.The proposed XMM observation will give J0256 dynamical merger state and anaccurate mass. This may be an early stage merger, which challenges the theorythat halos are produced by turbulent re-acceleration after the passage of mergershocks. We will search for shocks and cold fronts, and derive the merger speed.We will learn if this weak radio halo is due to an early-stage merger, a latemerger, or a low cluster mass, useful for future low frequency radio surveys.
Publications	The XMM Cluster Survey: new evidence for the 3.5-keV feature in clusters is inconsistent with a dark matter origin \|Bhargava S. Giles P. A. et al. \| MNRAS \| 497-656 \| 2020 \| 2020MNRAS.497..656B \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.497..656B Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2017-08-24T04:12:30Z/2017-08-25T06:32:30Z
Version	17.56_20190403_1200
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2018-09-11T22:00:00Z
Last Update	2025-01-27
Keywords	"stage merger", "act cl j0256", "cold fronts", "short xmm", "merger shoc", "radio halo", "lowest mass", "moderate redshift z", "363 merging cluster", "J0256.5", "act sz detection", "late merger", "merger speed", "turbulent re acceleration", "j0256 dynamical merger", "weak radio halo", "weakest sz", "low cluster mass", "XMM", "0006 j0256"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Craig Sarazin, 2018, 'Probing the Merger in ACT-CL J0256.5+0006: Understanding Low-Power Radio Halos', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-czit0er