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We present SCExAO/CHARIS 1.1--2.4 micron integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a…

With high-resolution infrared data becoming available that can probe the formation of high-mass stellar clusters for the first time, models that make testable predictions of these objects are necessary. We utilize a three-dimensional…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 David G. Whelan , Kelsey E. Johnson , Barbara A. Whitney , Remy Indebetouw , Kenneth Wood

Stellar clusters are regularly used to study the evolution of their host galaxy. Except for a few nearby galaxies, these studies rely on the interpretation of integrated cluster properties, especially integrated photometry observed using…

Astrophysics of Galaxies · Physics 2013-12-17 P. Anders , R. Kotulla , R. de Grijs , J. Wicker

We study a sample of 19 galaxy clusters in the redshift range $0.15<z<0.30$ with highly complete spectroscopic membership catalogues (to $K < K^{\ast}(\rm z)+1.5$) from the Arizona Cluster Redshift Survey (ACReS); individual weak-lensing…

Cosmology and Nongalactic Astrophysics · Physics 2017-10-11 Sarah L. Mulroy , Sean L. McGee , Steven Gillman , Graham P. Smith , Chris P. Haines , Jessica Democles , Nobuhiro Okabe , Eiichi Egami

Candidate clusters of galaxies drawn from the sample identified from the moderately deep I-band data of the ESO Imaging Survey (EIS), have been used for follow-up optical/infrared imaging and spectroscopic observations. The observations…

Astrophysics · Physics 2007-05-23 L. da Costa , M. Scodeggio , L. F. Olsen , C. Benoist

The origin of the diverse population of galaxy clusters remains an unexplained aspect of large-scale structure formation and cluster evolution. We present a novel method of using X-ray images to identify cool core (CC), weak cool core…

Cosmology and Nongalactic Astrophysics · Physics 2020-10-14 Y. Su , Y. Zhang , G. Liang , J. A. ZuHone , D. J. Barnes , N. B. Jacobs , M. Ntampaka , W. R. Forman , P. E. J. Nulsen , R. P. Kraft , C. Jones

We introduce Deep-CEE (Deep Learning for Galaxy Cluster Extraction and Evaluation), a proof of concept for a novel deep learning technique, applied directly to wide-field colour imaging to search for galaxy clusters, without the need for…

Astrophysics of Galaxies · Physics 2019-11-26 Matthew C. Chan , John P. Stott

We present a new approach to component separation in multifrequency CMB experiments by formulating the problem as that of partitioning the sky into pixel clusters such that within each pixel cluster the foregrounds have similar spectrum,…

Cosmology and Nongalactic Astrophysics · Physics 2019-03-18 Rishi Khatri

We introduce the first result of the Clusters Hiding in Plain Sight (CHiPS) survey, which aims to discover new, nearby, and massive galaxy clusters that were incorrectly identified as isolated point sources in the ROSAT All-Sky Survey. We…

Astrophysics of Galaxies · Physics 2021-01-22 T. Somboonpanyakul , M. McDonald , H. W. Lin , B. Stalder , A. Stark

Intracluster Light (ICL) provides an important record of the interactions galaxy clusters have undergone. However, we are limited in our understanding by our measurement methods. To address this we measure the fraction of cluster light that…

The outskirts of galaxy clusters, near the virial radius, remain relatively unexplored territory and yet are vital to our understanding of cluster growth, structure, and mass. In this presentation, we show the first results from a program…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-03 Eric D. Miller , Marshall Bautz , Jithin George , Richard Mushotzky , David Davis , J. Patrick Henry

We present first results from the Southern Cosmology Survey, a new multiwavelength survey of the southern sky coordinated with the Atacama Cosmology Telescope (ACT), a recently commissioned ground-based mm-band Cosmic Microwave Background…

Using multi-wavelength imaging from the Wide Field Camera 3 on the Hubble Space Telescope we study the stellar cluster populations of two adjacent fields in the nearby face-on spiral galaxy, M83. The observations cover the galactic centre…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 N. Bastian , A. Adamo , M. Gieles , H. J. G. L. M. Lamers , S. S. Larsen , E. Silva-Villa , L. J. Smith , R. Kotulla , I. S. Konstantopoulos , G. Trancho , E. Zackrisson

To explain the well-known tension between cosmological parameter constraints obtained from the primary CMB and those drawn from galaxy cluster samples, we propose a possible explanation for the incompleteness of detected clusters are higher…

Cosmology and Nongalactic Astrophysics · Physics 2024-11-20 Weiwei Xu , Linhua Jiang , Ran Li , Bin Luo , W. Nielsen Brandt , Chaoli Zhang , Thomas Erben

We conduct a series of comparisons between spectroscopic and photometric observations of globular clusters and stellar models to examine their predictive power. Data from medium-to-high resolution spectroscopic surveys of lithium allow us…

Solar and Stellar Astrophysics · Physics 2015-05-20 George Angelou , Valentina D'Orazi , Thomas Constantino , Ross Church , Richard Stancliffe , John Lattanzio

Two-dimensional high-resolution density field of galaxies of the Early Data Release of the Sloan Digital Sky Survey with a smoothing lengths 0.8 h^{-1} Mpc is applied to extract clusters of galaxies, and a low-resolution field with…

Astrophysics · Physics 2011-03-03 J. Einasto , G. H"utsi , M. Einasto , E. Saar , D. L. Tucker , V. M"uller , P. Hein"am"aki , S. S. Allam

The spatial morphological study of studied clusters is carried out through the identified probable members within them. The field stars decontamination is performed by the statistical cleaning approach (depends on the magnitude and colour…

Astrophysics of Galaxies · Physics 2017-12-05 Gireesh C. Joshi

We present the first cluster catalogue extracted from the UKIRT Infrared Deep Sky Survey Early Data Release. The catalogue is created using UKIDSS Ultra Deep Survey infrared J and K data combined with 3.6 micro-m and 4.5 micro-m Spitzer…

We discuss new photometry from high-resolution images of 7 intermediate-age (1-2 Gyr) star clusters in the Large Magellanic Cloud taken with the Advanced Camera for Surveys on board the Hubble Space Telescope. We fit color-magnitude…

Solar and Stellar Astrophysics · Physics 2015-05-28 Paul Goudfrooij , Thomas H. Puzia , Vera Kozhurina-Platais , Rupali Chandar

We present a new evolutionary synthesis (ES) tool specifically developed for the analysis of multi-color data of young star clusters (YSCs) in interacting galaxies. Our ESO/ST-ECF ASTROVIRTEL project provides an unprecedented database of…

Astrophysics · Physics 2007-05-23 Peter Anders , Uta Fritze--v. Alvensleben , Richard de Grijs