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Analysis of Hubble Space Telescope/Wide Field Planetary Camera 2 images of Stephan's Quintet, Hickson Compact Group 92, yielded 115 candidate star clusters (with V-I < 1.5). Unlike in merger remants, the cluster candidates in Stephan's…

天体物理学 · 物理学 2009-11-06 S. C. Gallagher , J. C. Charlton , S. D. Hunsberger , D. Zaritsky , B. C. Whitmore

We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z =1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical…

We present new near- and mid-infrared observations of 19 Class I/flat-spectrum young stellar objects in the nearby Rho Oph (d=125pc) and Serpens (d=310pc) dark clouds. These observations are part of a larger systematic infrared multiplicity…

天体物理学 · 物理学 2009-11-07 K. E. Haisch , M. Barsony , T. P. Greene , M. E. Ressler

We report the discovery of a galaxy cluster at z=1.27. ClG J0848+4453 was found in a near-IR field survey as a high density region of objects with very red J-K colors. Optical spectroscopy of a limited number of 24 < R < 25 objects in the…

天体物理学 · 物理学 2009-10-30 S. A. Stanford , Richard Elston , Peter Eisenhardt , Hyron Spinrad , Daniel Stern , Arjun Dey

This manuscript presents new astronomical source catalogs using data from the BUFFALO Survey. These catalogs contain detailed information for over 100,000 astronomical sources in the 6 BUFFALO clusters: Abell 370, Abell 2744, Abell S1063,…

Recently, there have been numerous analyses of the redshift space power spectrum of rich clusters of galaxies. Some of these analyses indicate a "bump" in the Abell/ACO cluster power spectrum around k= 0.05hMpc^-1. Such a feature in the…

天体物理学 · 物理学 2009-10-31 Christopher J. Miller , David J. Batuski

This paper is the second in a series devoted to the hard X-ray (17-60 keV) whole sky survey performed by the INTEGRAL observatory over seven years. Here we present a catalog of detected sources which includes 521 objects, 449 of which…

高能天体物理现象 · 物理学 2015-05-19 R. Krivonos , S. Tsygankov , M. Revnivtsev , S. Grebenev , E. Churazov , R. Sunyaev

Our Galactic Center hosts over 10% of the known massive stars in the Galaxy. The majority of these stars are located in three particularly massive clusters that formed within the past 5 Myr. While these clusters are extraordinary, their…

天体物理学 · 物理学 2009-11-07 Donald F. Figer

Using a new compilation of available data on galaxy clusters and superclusters we present evidence for a quasiregular three-dimensional network of rich superclusters and voids, with the regions of high density separated by about 120 Mpc. We…

We construct a catalog of star clusters from Hubble Space Telescope images of the inner disk of the Triangulum Galaxy (M33) using image classifications collected by the Local Group Cluster Search, a citizen science project hosted on the…

A catalog of nearby clusters in the 5800 deg$^2$ area in the southern Galactic cap is constructed by applying a matched-filter cluster-finding algorithm to the sample of 3.3 million galaxies from the APM Galaxy Survey. I have preliminarily…

天体物理学 · 物理学 2007-05-23 Wataru Kawasaki

The results of a search for compact clusters in the vicinity of 19 IRAS sources based on data from the GPS UKIDSS and Spitzer GLIMPSE surveys are presented. Overall, clusters have been identified in 15 regions. Clusters are identified for…

太阳与恒星天体物理 · 物理学 2016-09-07 N. M. Azatyan , E. H. Nikoghosyan , K. G. Khachatryan

Globular clusters are found usually in galaxies and they are an excellent tracer of dark matter. Long ago it was suggested that there may exist intracluster globular clusters (IGCs) bound to a galaxy cluster rather than to any single…

宇宙学与河外天体物理 · 物理学 2015-05-18 Myung Gyoon Lee , Hong Soo Park , Ho Seong Hwang

What do we see when we look at a nearby, well-resolved galaxy? Thousands of individual sources are detected in multiband imaging observations of even a fraction of a nearby galaxy, and characterizing those sources is a complex process. This…

星系天体物理 · 物理学 2018-02-21 A. Kiar , P. Barmby , A. Hidalgo

Deep imaging with WFPC2 and the Hubble Space Telescope has been used to search for a population of intergalactic globular clusters (GCs) belonging to Abell 1185, a richness I cluster at cz = 9800 km/s. The field is noteworthy in that it…

天体物理学 · 物理学 2009-11-07 Andres Jordan , Michael J. West , Patrick Cote , Ronald O. Marzke

We report the detection of variable stars within a 11.5' x 11.5' region near the Galactic centre (GC) that includes the Arches and Quintuplet clusters, as revealed by the VISTA Variables in the Via Lactea (VVV) survey. There are 353 sources…

太阳与恒星天体物理 · 物理学 2018-11-28 C. Navarro Molina , J. Borissova , M. Catelan , P. W. Lucas , N. Medina , C. Contreras Pena , R. Kurtev , D. Minniti

The results of a search for distant clusters of galaxies performed using the I-band data obtained by the ESO Imaging Survey (EIS) are presented. Cluster candidates are identified using a matched filter algorithm, that provides not only an…

天体物理学 · 物理学 2007-05-23 M. Scodeggio , L. F. Olsen , L. N. da Costa

An extensive redshift survey has been conducted on a sample of 15 nearby (0.01 < z < 0.05) clusters of galaxies. A total number of 860 redshifts were determined by fitting of emission--lines and/or cross-correlation techniques. Of this…

天体物理学 · 物理学 2007-05-23 P. Stein

In this contribution, first results of deep VLT photometry (V,I) in the central region of the Hydra I and Centaurus galaxy clusters are presented. In both galaxy clusters, many star clusters have been identified down to the turnover…

天体物理学 · 物理学 2007-05-23 Michael Hilker

The Galactic center (GC) is a dense and chaotic region filled with unusual sources, such as intense star forming regions, dense star clusters, nonthermal radio filaments, and a massive black hole. The proximity of the GC region makes it an…

天体物理学 · 物理学 2016-06-22 Casey James Law