H. Quintana

Universidad de Lima

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L. Infante

Las Campanas Observatory

P. Fouqué

Université Toulouse III - Paul Sabatier

Dominique Proust

Observatoire de Paris

H. Cuevas

University of La Serena

A. Vikhlinin

Center for Astrophysics Harvard & Smithsonian

H. V. Capelato

Universidade Cruzeiro do Sul

H. Böhringer

Max Planck Institute for Extraterrestrial Physics

A. Hornstrup

Technical University of Denmark

R. Fassbender

Max Planck Institute for Extraterrestrial Physics

G. Lamer

Leibniz Institute for Astrophysics Potsdam

Cooperative Institutions

Purple Mountain Observatory

158

Centre National de la Recherche Scientifique

121

Max Planck Society

Goddard Space Flight Center

Netherlands Institute for Radio Astronomy

Center for Astrophysics Harvard & Smithsonian

Princeton University

Observatoire de Paris

Max Planck Institute for Extraterrestrial Physics

California Institute of Technology

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Velocity Dispersions and Cluster Properties in the Southern Abell Redshift Survey Clusters. II.

The Astronomical Journal (2002)

H. Muriel H. Quintana L. Infante D. G. Lambas M. J. Way

We report an analysis of the dynamical structure of clusters of galaxies from a survey of photometric and spectroscopic observations in the fields of southern Abell clusters. We analyze the galaxy velocity field in extended regions up to 7 h-1 Mpc from cluster centers, and we estimate mean velocity dispersions and their radial dependence. Only one from a total of 41 Abell clusters does not correspond to a dynamically bound system. However, four of these bound objects are double clusters. We estimate that 20% (seven clusters) of the 35 remaining are subject to serious projection effects. Normalizing the clustercentric distances by means of the overdensity radius r200, and the velocity dispersion profiles (VDPs) by the corresponding mean cluster velocity dispersion, we computed the average VDP. Our results indicate a flat behavior of the mean VDP at large distances from the cluster center. Nevertheless, we found that for the inner part of the clusters (r/r200 ≤ 1) the VDP is up to 10% smaller than at larger radii.

Velocity dispersion

Abell 2744

Radial velocity

10.1086/342854

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Citations (17)

WQ 2059-247: an unusual high redshift X-ray cluster

NASA STI/Recon Technical Report N (1980)

R. A. White Craig L. Sarazin H. Quintana Walter Jaffe

X-ray, optical, and radio observations of a high redshift, Bautz-Morgan type I cluster of galaxies are reported. The cD galaxy contains a powerful, flat spectrum radio source coincident with the possibly stellar nucleus. The cluster is an extremely luminous X-ray source; however, unlike nearby luminous X-ray clusters the X-ray spectrum appears to be rather soft. Two possible interpretations of the soruces are suggested: either the intracluster gas is much cooler in high redshift clusters because they are less relaxed, or the X-ray and radio emissions from WQ 2059-247 are the result of a non thermal QSO/BL Lac type object in the nucleus of the cD.

BL Lac object

Intracluster medium

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Identification and study of systems of galaxies in the Shapley supercluster

Astronomy and Astrophysics (2006)

C. J. Ragone H. Muriel D. Proust Andreas Reisenegger H. Quintana

Based on the largest compilation of galaxies with redshift in the region of the Shapley Supercluster (Proust et al. 2004, P2004), we identified 122 galaxy systems, 60 of which are new systems. Using the SuperCOSMOS catalogue, we have assigned bj magnitudes to each galaxy in our compilation. The sample of galaxy systems was used to estimate the mass function of systems in the range 1013 to 1015 . We computed a lower value to the total mass in the region of the Shapley Supercluster with this mass function. Using 15 mock catalogues we derived the mean mass that these kinds of systems have before comparing it with that obtained from the real data.

Supercluster (genetic)

10.1051/0004-6361:20053623

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Citations (23)

The Shapley Supercluster. I. Spectroscopic Observations in the Central Region

The Astronomical Journal (1995)

H. Quintana A. Ramirez Jorge Melnick Somak Raychaudhury E. Slezak

We present a new analysis of the kinematics of the Shapley supercluster based on radial velocities for 1087 galaxies in the clusters A3558 (Shapley 8), A3528 (Klemola 21), A3532 (Klemola 22), A3530, A3556 (SC 1321-314), A3559 (CE 1327-292), A3560, A3562, SC 1329-314 and in the intercluster region of the core of the supercluster, of which 367 are new measurements. We also present accurate positions from APM and MAMA scans of the ESO/SERC Southern Sky Survey photographic plates. We obtain new velocity dispersions and estimate the masses of the member clusters, evaluating dynamical models of the supercluster. The supercluster is found to be significantly flattened. We find that for {OMEGA}_0_ = 0.3, H_0_= 75 km s^-1^ Mpc^-1^, the gravitational pull of the supercluster may account for up to 25% of the peculiar velocity of the Local Group required to explain the dipole anisotropy of the Cosmic Microwave Background radiation, in which case the mass of the supercluster would be dominated by intercluster dark matter. This fractional contribution would be considerably higher for combinations of significantly lower values of {OMEGA}_0_ and higher values of H_0_.

Supercluster (genetic)

10.1086/117535

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Citations (55)

Dynamics of a Bose Einstein condensate in a ring potential

H. Quintana

Numerical studies of the interference pattern produced when the clock-wise and counter-clock wise components of a BEC propagation in a ring geometry interact.

Dynamics

Source

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THE ATACAMA COSMOLOGY TELESCOPE: SUNYAEV-ZEL'DOVICH-SELECTED GALAXY CLUSTERS AT 148 GHz IN THE 2008 SURVEY

The Astrophysical Journal (2011)

Tobias A. Marriage Viviana Acquaviva P. A. R. Ade Paula Aguirre M. Amiri

We report on 23 clusters detected blindly as Sunyaev–ZEL'DOVICH (SZ) decrements in a 148 GHz, 455 deg2 map of the southern sky made with data from the Atacama Cosmology Telescope 2008 observing season. All SZ detections announced in this work have confirmed optical counterparts. Ten of the clusters are new discoveries. One newly discovered cluster, ACT-CL J0102−4915, with a redshift of 0.75 (photometric), has an SZ decrement comparable to the most massive systems at lower redshifts. Simulations of the cluster recovery method reproduce the sample purity measured by optical follow-up. In particular, for clusters detected with a signal-to-noise ratio greater than six, simulations are consistent with optical follow-up that demonstrated this subsample is 100% pure. The simulations further imply that the total sample is 80% complete for clusters with mass in excess of 6 × 1014 solar masses referenced to the cluster volume characterized by 500 times the critical density. The Compton y–X-ray luminosity mass comparison for the 11 best-detected clusters visually agrees with both self-similar and non-adiabatic, simulation-derived scaling laws.

South Pole Telescope

Sunyaev–Zel'dovich effect

10.1088/0004-637x/737/2/61

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Citations (222)

Commission 30: Radial Velocities: (Vitesses Radiales)

Transactions of the International Astronomical Union (2000)

J. B. Hearnshaw Andreï Tokovinin Willam D. Cochran Francis C. Fekel T. Mazeh

Commission 30 has 120 members in 28 countries who are active in the area of radial velocities. During the past triennium 11 new members have joined the commission. The work of the commission covers a wide range of topics all of which concern the application of the Doppler effect to astronomical objects, including galaxies and the interstellar medium as well as stars, and in all wavelength ranges of the electromagnetic spectrum. Although the commission focuses mainly on stellar and galaxy radial velocities, it is noted that stellar rotation, spectroscopic binaries, extrasolar planet searches, pulsating variable stars, asteroseismology and turbulence in stellar atmospheres are also included.

Radial velocity

Asteroseismology

Stellar rotation

Variable star

10.1017/s0251107x00003291

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Commission 30: Radial Velocities: (Vitesses Radiales)

Transactions of the International Astronomical Union (2002)

Andreï Tokovinin B. Nordström Dainis Dravins H. Levato⋆T. Mazeh

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10.1017/s0251107x00001711

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Calan 129-1 : a southern double cluster of galaxies ?

Publications of the Astronomical Society of the Pacific (1975)

H. Quintana J. Melnick

Observations of a peculiar southern cluster with Abell richness class 0 and a redshift of 0.015 are presented. A population and morphology analysis leads to the interpretation that this is a system of two clusters. Some evidence suggesting an interaction due to intracluster gas is also briefly discussed. Key words: clusters of galaxies

Abell 2744

Intracluster medium

10.1086/129861

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Citations (2)

Optical studies of X-ray clusters of galaxies. IV - Velocity dispersions for the cD clusters A496 and A2052

The Astronomical Journal (1985)

H. Quintana J. Melnick L. Infante B. Thomas

Spectroscopic observations carried out at CTIO and La Silla of two regular, elliptically dominated, rich Abell clusters with central cD galaxies are presented. Velocity dispersions of 657 (+ 104, - 72) km/s for A496, and 576 (+ 83, - 60) km/s for A2052 are derived. Some of the consequences of these values for the proposed interpretations of the X-ray characteristics of both clusters are briefly discussed.

Velocity dispersion

10.1086/113746

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Citations (7)