Mustang High Angular Resolution Sunyaev-Zel'dovich Effect Imaging of Substructure in Four Galaxy Clusters

Korngut, Phillip; Dicker, Simon; Reese, Erik D.; Mason, B. S.; Devlin, Mark J.; Mroczkowski, Tony; Sarazin, Craig L.; Sun, Ming; Sievers, Jonathan

doi:10.1088/0004-637x/734/1/10

Cited by 123 publications

(168 citation statements)

References 77 publications

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“…However, the cluster core is slightly elongated toward the southwest at scales close to our our beam (and smaller). Using MUSTANG 90 GHz observations, at an effective resolution of 11 arcsec, Korngut et al (2011) have indeed detected a narrow ridge ∼20 arcsec long located about 10 arcsec from the X-ray center towards the southwest. This is consistent with the hotter region found by Maughan et al (2007) using Chandra and XMM X-ray data.…”

Section: Nika Dual-band Detection and Mapping Of The Tsz Signalmentioning

confidence: 94%

“…The mass inferred within the radius 1 r ∆ = 200 is (1.4 ± 0.2) × 10 15 M . Finally, MUSTANG tSZ observations at 90 GHz on ∼8−45 arcsec scales (Korngut et al 2011) have revealed a narrow 20 arcsec long ridge 10 arcsec southwest of the X-ray peak, in addition to another peak coincident with X-ray and the brightest cluster galaxy.…”

Section: Introductionmentioning

confidence: 95%

“…From their observations, no such objects are present within the NIKA field. From the residual between the MUSTANG map and the SZA pressure model of Mroczkowski et al (2009), Korngut et al (2011) have inferred the presence of a possible submillimeter source 10 arcsec north of the X-ray peak. Using the NIKA 260 GHz frequency band, we searched for such a contaminant and do not observe any point source within a 1.5 arcmin radius around the map center, apart from PS260.…”

Section: Point Source Contaminationmentioning

confidence: 99%

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Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA

Adam

Comis

Macías-Pérez

et al. 2015

A&A

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The thermal Sunyaev-Zel'dovich (tSZ) effect is expected to provide a low scatter mass proxy for galaxy clusters since it is directly proportional to the cluster thermal energy. The tSZ observations have proven to be a powerful tool for detecting and studying them, but high angular resolution observations are now needed to push their investigation to a higher redshift. In this paper, we report high angular (<20 arcsec) resolution tSZ observations of the high-redshift cluster CL J1226.9+3332 (z = 0.89). It was imaged at 150 and 260 GHz using the NIKA camera at the IRAM 30-m telescope. The 150 GHz map shows that CL J1226.9+3332 is morphologically relaxed on large scales with evidence of a disturbed core, while the 260 GHz channel is used mostly to identify point source contamination. NIKA data are combined with those of Planck and X-ray from Chandra to infer the cluster's radial pressure, density, temperature, and entropy distributions. The total mass profile of the cluster is derived, and we find M 500 = 5.96 +1.02 −0.79 × 10 14 M within the radius R 500 = 930 +50 −43 kpc, at a 68% confidence level. (R 500 is the radius within which the average density is 500 times the critical density at the cluster's redshift.) NIKA is the prototype camera of NIKA2, a KIDs (kinetic inductance detectors) based instrument to be installed at the end of 2015. This work is, therefore, part of a pilot study aiming at optimizing tSZ NIKA2 large programs.

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Section: Nika Dual-band Detection and Mapping Of The Tsz Signalmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

Section: Point Source Contaminationmentioning

confidence: 99%

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Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA

Adam

Comis

Macías-Pérez

et al. 2015

A&A

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“…Early single target SZ studies were limited to the clusters' inner regions (i.e., within R 500 ), and were not really competitive with the X-ray measurements in terms of resolution and sensitivity (see e.g., Pointecouteau et al 2001;Halverson et al 2009;Korngut et al 2011). However, the combination of SZ and X-ray tracers has already shown its potential in terms of structural studies of clusters (Pointecouteau et al 2002;Kitayama et al 2004;Jia et al 2008;Basu et al 2010).…”

Section: The Inner Profilementioning

confidence: 99%

Planckintermediate results

Ade

Aghanim

Arnaud

et al. 2013

A&A

291

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Taking advantage of the all-sky coverage and broad frequency range of the Planck satellite, we study the Sunyaev-Zeldovich (SZ) and pressure profiles of 62 nearby massive clusters detected at high significance in the 14-month nominal survey. Careful reconstruction of the SZ signal indicates that most clusters are individually detected at least out to R 500 . By stacking the radial profiles, we have statistically detected the radial SZ signal out to 3 × R 500 , i.e., at a density contrast of about 50-100, though the dispersion about the mean profile dominates the statistical errors across the whole radial range. Our measurement is fully consistent with previous Planck results on integrated SZ fluxes, further strengthening the agreement between SZ and X-ray measurements inside R 500 . Correcting for the effects of the Planck beam, we have calculated the corresponding pressure profiles. This new constraint from SZ measurements is consistent with the X-ray constraints from XMM-Newton in the region in which the profiles overlap (i.e., [0.1-1] R 500 ), and is in fairly good agreement with theoretical predictions within the expected dispersion. At larger radii the average pressure profile is slightly flatter than most predictions from numerical simulations. Combining the SZ and X-ray observed profiles into a joint fit to a generalised pressure profile gives best-fit parameters [P 0 , c 500 , γ, α, β] = [6.41, 1.81, 0.31, 1.33, 4.13]. Using a reasonable hypothesis for the gas temperature in the cluster outskirts we reconstruct from our stacked pressure profile the gas mass fraction profile out to 3 R 500 . Within the temperature driven uncertainties, our Planck constraints are compatible with the cosmic baryon fraction and expected gas fraction in halos. Key words. cosmology: observations -galaxies: clusters: general -galaxies: clusters: intracluster medium -submillimeter: general -X-rays: general Appendices are available in electronic form at

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“…Recent instrumental advances have opened up the SZE as a promising tool to study cluster astrophysics (Ferrari et al 2011;Korngut et al 2011; Planck Collaboration 2013, hereafter P13). Yet no direct determination of the shock front at radio relics with the SZE effect has arXiv:1411.5476v2 [astro-ph.CO] 16 Jan 2015 been published.…”

Section: Introductionmentioning

confidence: 99%

Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev–Zel'dovich effect data

Erler

Basu

Trasatti

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Radio relics are Mpc-scale diffuse synchrotron sources found in galaxy cluster outskirts. They are believed to be associated with large-scale shocks propagating through the intracluster medium, although the connection between radio relics and the cluster merger shocks is not yet proven conclusively. We present a first tentative detection of a pressure jump in the well-known relic of the Coma cluster through Sunyaev-Zel'dovich (SZ) effect imaging. The SZE data are extracted from the first public all-sky data release of Planck and we use highfrequency radio data at 2.3 GHz to constrain the shock-front geometry. The SZE data provide evidence for a pressure discontinuity, consistent with the relic position, without requiring any additional prior on the shock-front location. The derived Mach number M = 2.9 +0.8 −0.6 is consistent with X-ray and radio results. A high-pressure "filament" without any pressure discontinuity is disfavoured by X-ray measurements and a "sub-cluster" model based on the infalling group NGC 4839 can be ruled out considering the published mass estimates for this group. These results signify a first attempt towards directly measuring the pressure discontinuity for a radio relic and the first SZ-detected shock feature observed near the virial radius of a galaxy cluster.

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Mustang High Angular Resolution Sunyaev-Zel'dovich Effect Imaging of Substructure in Four Galaxy Clusters

Cited by 123 publications

References 77 publications

Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA

Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA

Planckintermediate results

Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev–Zel'dovich effect data

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