APEX-SZ first light and instrument status

Dobbs, M.; Halverson, N. W.; Ade, Peter A. R.; Basu, Kaustuv; Beelen, A.; Bertoldi, F.; Cohalan, C.; Cho, H. M.; Güsten, R.; Holzapfel, W. L.; Kermish, Z.; Kneißl, R.; Kovács, A.; Kreysa, E.; Lanting, T.; Lee, A. T.; Lueker, M.; Mehl, J.; Menten, K. M.; Muders, D.; Nord, M.; Plagge, T.; Richards, P. L.; Schilke, P.; Schwan, D.; Spieler, H.; Weiß, A.; White, Martin

doi:10.1016/j.newar.2006.09.029

Cited by 50 publications

(45 citation statements)

References 13 publications

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“…During the commissioning observation of the APEX-SZ bolometer camera (Schwan et al 2003;Dobbs et al 2006) in 2007, we detected Abell 2163 with high significance (12σ) at 150 GHz with arcminute resolution. We observed the cluster in the SZE increment at 345 GHz using the LABOCA bolometer camera (Kreysa et al 2003;Siringo et al 2009) on APEX, providing images with an angular resolution of 19.5 .…”

Section: Introductionmentioning

confidence: 94%

Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich effect

Nord

Basu

Pacaud

et al. 2009

A&A

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Context. Observations of the Sunyaev-Zel'dovich effect (SZE) from galaxy clusters are emerging as a powerful tool in cosmology. Besides large cluster surveys, resolved SZE images of individual clusters can shed light on the physics of the intra-cluster medium (ICM) and allow accurate measurements of the cluster gas and total masses. Aims. We used the APEX-SZ and LABOCA bolometer cameras on the APEX telescope to map both the decrement of the SZE at 150 GHz and the increment at 345 GHz toward the rich and X-ray luminous galaxy cluster Abell 2163 at redshift 0.203. The SZE images were used, in conjunction with archival XMM-Newton X-ray data, to model the radial density and temperature distribution of the ICM, as well as to derive the gas mass fraction in the cluster under the assumption of hydrostatic equilibrium. Methods. We describe the data analysis techniques developed to extract the faint and extended SZE signal. We used the isothermal β model to fit the SZE decrement/increment radial profiles. We performed a simple, non-parametric de-projection of the radial density and temperature profiles, in conjunction with X-ray data, under the simplifying assumption of spherical symmetry. We combined the peak SZE signals derived in this paper with published SZE measurements of this cluster to derive the cluster line-of-sight bulk velocity and the central Comptonization, using priors on the ICM temperature. Results. We find that the best-fit isothermal model to the SZE data is consistent with the ICM properties implied by the X-ray data, particularly inside the central 1 Mpc radius. Inside a radius of ∼1500 kpc from the cluster center, the mean gas temperature derived from our SZE/X-ray joint analysis is 10.4 ± 1.4 keV. The error budget for the derived temperature profile is dominated by statistical errors in the 150 GHz SZE image. From the isothermal analysis combined with previously published data, we find a line-of-sight peculiar velocity consistent with zero; v r = −140 ± 460 km s −1 , and a central Comptonization y 0 = 3.42 ± 0.32 × 10 −4 for Abell 2163. Conclusions. Although the assumptions of hydrostatic equilibrium and spherical symmetry may not be optimal for this complex system, the results obtained under these assumptions are consistent with X-ray and weak-lensing measurements. This shows the applicability of the simple joint SZE and X-ray de-projection technique described in this paper for clusters with a wide range of dynamical states.

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Section: Introductionmentioning

confidence: 94%

Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich effect

Nord

Basu

Pacaud

et al. 2009

A&A

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“…For over a decade, observations of the thermal Sunyaev-Zel'dovich Effect (tSZE, hereafter simply SZE; Sunyaev & Zel'dovich 1970;Birkinshaw 1999) have been considered as a promising complement to X-ray observations for modeling the ICM in galaxy clusters, yet only recently has it been possible to make meaningful de-projections of gas temperature and density profiles using SZE imaging data from multi-pixel bolometer arrays, in combination with X-ray data. The APEX-SZ experiment (Dobbs et al 2006;Halverson et al 2009) employs one of the first such powerful multi-pixel A&A 519, A29 (2010) Transition-Edge Sensor (TES) bolometer cameras, and a joint analysis of the ICM properties using SZE and X-ray data has been presented by Nord et al (2009, hereafter NBP09) for the massive cluster Abell 2163.…”

Section: Introductionmentioning

confidence: 99%

Non-parametric modeling of the intra-cluster gas using APEX-SZ bolometer imaging data

Basu

Zhang

Sommer

et al. 2010

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Aims. We aim to demonstrate the usability of mm-wavelength imaging data obtained from the APEX-SZ bolometer array to derive the radial temperature profile of the hot intra-cluster gas out to radius r 500 and beyond. The goal is to study the physical properties of the intra-cluster gas by using a non-parametric de-projection method that is, aside from the assumption of spherical symmetry, free from modeling bias. Methods. We use publicly available X-ray spectroscopic-imaging data in the 0.7−2 keV energy band from the XMM-Newton observatory and our Sunyaev-Zel'dovich Effect (SZE) imaging data from the APEX-SZ experiment at 150 GHz to de-project the density and temperature profiles for a well-studied relaxed cluster, Abell 2204. We derive the gas density, temperature and entropy profiles assuming spherical symmetry, and obtain the total mass profile under the assumption of hydrostatic equilibrium. For comparison with X-ray spectroscopic temperature models, a re-analysis of recent Chandra observation is done with the latest calibration updates. We compare the results with that from an unrelaxed cluster, Abell 2163, to illustrate some differences between relaxed and merging systems. Results. Using the non-parametric modeling, we demonstrate a decrease of gas temperature in the cluster outskirts, and also measure gas entropy profiles, both of which are done for the first time independently of X-ray spectroscopy using the SZE and X-ray imaging data. The gas entropy measurement in the central 100 kpc shows the usability of APEX-SZ data for inferring cluster dynamical states with this method. The contribution of the SZE systematic uncertainties in measuring T e at large radii is shown to be small compared to XMM-Newton and Chandra systematic spectroscopic errors. The total mass profile obtained using the hydrostatic equilibrium assumption is in agreement with the published X-ray and weak lensing results; the upper limit on M 200 derived from the non-parametric method is consistent with the NFW model prediction from weak lensing analysis.

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“…The Sunyaev-Zeldovich (SZ) effect (Sunyaev & Zeldovich 1972;Birkinshaw 1999) offers a fresh means to address this problem. Large-area SZ surveys are just beginning to be amassed by ground-based instruments such as the Atacama Cosmology Telescope (ACT, Swetz et al 2008;Marriage et al 2011;Sehgal et al 2011;Hand et al 2011), the South Pole Telescope (SPT, Carlstrom et al 2011;Staniszewski et al 2009;Vanderlinde et al 2010;Williamson et al 2011) and APEX-SZ (Dobbs et al 2006), as well as by the Planck 1 satellite mission, (Planck Collaboration 2011c,d,e,f,g).…”

Section: Introductionmentioning

confidence: 99%

Planckintermediate results

Ade

Aghanim

Arnaud

et al. 2013

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We present the scaling relation between Sunyaev-Zeldovich (SZ) signal and stellar mass for almost 260,000 locally brightest galaxies (LBGs) selected from the Sloan Digital Sky Survey (SDSS). These are predominantly the central galaxies of their dark matter halos. We calibrate the stellar-to-halo mass conversion using realistic mock catalogues based on the Millennium Simulation. Applying a multi-frequency matched filter to the Planck data for each LBG, and averaging the results in bins of stellar mass, we measure the mean SZ signal down to M * ∼ 2 × 10 11 M , with a clear indication of signal at even lower stellar mass. We derive the scaling relation between SZ signal and halo mass by assigning halo properties from our mock catalogues to the real LBGs and simulating the Planck observation process. This relation shows no evidence for deviation from a power law over a halo mass range extending from rich clusters down to M 500 ∼ 2 × 10 13 M , and there is a clear indication of signal down to M 500 ∼ 4 × 10 12 M . Planck's SZ detections in such low-mass halos imply that about a quarter of all baryons have now been seen in the form of hot halo gas, and that this gas must be less concentrated than the dark matter in such halos in order to remain consistent with X-ray observations. At the high-mass end, the measured SZ signal is 20 % lower than found from observations of X-ray clusters, a difference consistent with the magnitude of Malmquist bias effects that were previously estimated for the X-ray sample.

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APEX-SZ first light and instrument status

Cited by 50 publications

References 13 publications

Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich effect

Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich effect

Non-parametric modeling of the intra-cluster gas using APEX-SZ bolometer imaging data

Planckintermediate results

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