Program Number . ... Gordon Drukier, Yale University . Shooting Stars: Looking for Direct Evidence of Massive Central Black Holes in Globular Clusters . Abstract . ... Hubble Heritage Observations of Arp 148 . ... The Sloan Digital Sky Survey (SDSS) has proven a powerful tool for identifying new lens candidates, although high angular resolution HST observations are essential for confirming those candidates as genuine gravitational lensing systems (see Program GO 10886). ... Past weeks: . ...

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• The Orion Nebula Cluster . as a Paradigm of Star Formation
• The 24 Micron View of Embedded Star Formation in NGC 7129

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• APOD: January 11, 1998 - Abell 2218: A Galaxy Cluster Lens
• APOD: 2000 February 1 - Abell 2218: A Galaxy Cluster Lens
• APOD: July 10, 1995 - Abell 2218: A Galaxy Cluster Lens

... Australia Telescope Compact Array . ... Compact Stellar Systems in the Fornax Cluster: Super-massive Star Clusters or Extremely Compact Dwarf Galaxies? ... We suggest that these objects are either super-massive star clusters (intra-cluster globular clusters or tidally stripped nuclei of dwarf galaxies) or a new type of low-luminosity compact elliptical dwarf (``M32-type'') galaxy. ... Keywords: galaxies: star clusters -- galaxies: dwarf -- galaxies: formation . ... Properties of the compact objects ...

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• AAO Colloquium - Ab Initio Globular Cluster System Formation
• ATNF Colloquium
• A Statistical Comparison of Line Strength Variations in Coma and Cluster

... Science Users Information > Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: The onset of cluster formation near young high-mass stars . ... Observing with ESO Telescopes . ... ESO-MIDAS . ... ESO Data . ... We performed a NACO survey of massive young stellar objects (MYSOs) assessing the incidence of lower mass objects at angular scales 0:500 < d < 200 during the earliest, deeply embedded, phases of star formation. ... Return to list of thesis topics . ...

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• ESO - star07
• Ultra-compact dwarf galaxies
• ESO - The Young Star Cluster Pismis 24 in ARA: a Laboratory of Star Formation

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

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• Observational Constraints
• Astronomy HyperText Book: Interstellar Medium

... Abell 2218: A Galaxy Cluster Lens . ... WFPC2 , HST , NASA Explanation: Gravity can bend light, allowing huge clusters of galaxies to act as telescopes. Almost all of the bright objects in this Hubble Space Telescope image are galaxies in the cluster known as Abell 2218. ... Publications with keywords: Abell 2218 - cluster of galaxies - gravitational lens . Publications with words: Abell 2218 - cluster of galaxies - gravitational lens . ... Abell 370: Galaxy Cluster Gravitational Lens . ...

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• Galaxy Cluster Lenses Farthest Known Galaxy

Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Image credit:ESO/J.Emerson/VISTA. ... However others are less pessimistic and it has even been claimed that the mysterious ?Wow! signal? received in 1977 originated from the direction M55.б  Sadly, this still unexplained pulse of radio energy originated from a location rather to the northwest of M55 so I doubt if the source was this cluster (if indeed the signal was genuinely of extraterrestrial origin). ... Mysterious Wow! ...

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• Hubble shows us a spectacular star cluster | Astronotes

... Astrophysics Group . ... AMI Science . ... Observations of galaxy clusters are central to the AMI science programme. The AMI Small Array is used to observe already-known clusters with high-sensitivity and resolution, allowing us to extract detailed information about individual clusters and to build up statistics about the cluster population. ... Observing galaxy clusters at 15 GHz is tricky because of the contamination from foreground radio sources, which is where the Large Array comes in! ...

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• Abstract
• Astrophysics Group Arcminute Microkelvin Imager (AMI) Digital Correlator

... However, while low mass stars are usually found to form in loose groups with densities of a few stars per cubic parsecs, high mass stars are known to form in dense clusters with up to 10000 stars per cubic parsec. ... We have undertaken a survey of a cospicuous number of fields around intermediate mass young stars (Herbig Ae/Be stars, HAeBe) with the aim of detect and characterize the groups of young stars that may have formed together with the HAeBe star. ... BD +404124 - A rich, compact cluster. ...

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• HAEBE Clusters Analysis (Abstract)
• Serpmap (Abstract)
• Arcetri Star-Formation Group Publications

... Chandra Observation of DEEP2 Galaxy Groups and Clusters . ... Monday: 'Normal' Galaxies, Tuesday: Cluster Formation and Evolution . ... Statistics of galaxy groups in ultradeep XMM surveys. ... What can multiwavelength observations tell about cluster/group formation as well as galaxy evolution? ... I will present results from a Chandra study of eight low-redshift clusters that has systematically measured the AGN fraction in clusters and describe their spatial, kinematic, and host galaxy...

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• The AstroStat Slog clusters
• The AstroStat Slog globular cluster
• The AstroStat Slog Blog Archive my first AAS. IV. clustering

... We address a question if globular clusters (GC) in a protogalaxy could for some time evolve chemically as isolated systems, enriching themselves with heavy elements produced in first supernova events that follow initial star formation. We determine both the critical mass of a protoglobular cluster that is needed to retain the ejecta of the very first supernova, and the critical energy (i.e., number of supernovae) that is needed to expel the residual gas from a cluster of a given mass. ...

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• On current distance scales for open clusters

Our early publications since 1990 till 1995 year . ... 7.Yu.I.Izotov, N.G.Guseva, V.A.Lipovetsky, A.Yu.Kniazev, J.A. Stepanian, 1990, Nature, 343, 238, Unusual low heavy-element abundance found in the blue compact galaxy SBS 0335-052 8.Yu.I.Izotov, N.G.Guseva, V.A.Lipovetsky, A.Yu,Kniazev, J.A.Stepanian, 1990, Physical Processes in Fragmentation and Star Formation, 1990, Kluwer Academic Publisher, p.235-240. ... New blue compact dwarf galaxies with low heavy-element abundances. ... 1993. ...

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• Cluster Analysis
• Cluster radio source identifications
• Gravitational Lensing by Clusters of Galaxies

. Andrey Kravtsov "High-Resolution Cosmological Simulations of Cluster Formation" . < FIRST ] [ PREVIOUS ] [ MAIN . Slide 17 (of 17) .

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A Canadian and American team of Astronomers have used the 305-m wide Arecibo radio dish, the world's largest and most sensitive radio telescope, to uncover a dozen new super-fast-spinning pulsars. The team directed their search for these rare and exotic stars by pointing the Arecibo radio telescope towards massive star clusters, called Globular Clusters, orbiting our Milky Way galaxy. ... One of the most exotic residents in the Globular cluster system are the millisecond pulsars. ...

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• Thesis Figures
• The Evolution of Galaxies Seen Through The Neutral Hydrogen Line The Evolution
• GOLDMiNe: Virgo cluster optical and HI databases

... In the first panel, an "intruder" spiral galaxy approaches a galaxy cluster center, where a compact elliptical galaxy (cE) already revolves around a massive central elliptical galaxy. In the second panel, a close encounter occurs and the compact elliptical receives a gravitational kick from the intruder. In the third panel, the compact elliptical escapes the galaxy cluster while the intruder is devoured by the giant elliptical galaxy in the cluster center. ...

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• The Smithsonianт??s Submillimeter Array reveals giant star cluster in the
• The Milky Way's central X-ray loop | Astronomy.com
• Astronomers find "smoking gun" of compact galaxy formation | Astronomy.com

... LMC Project Outline . NGC 1818 Initial Results . ... The Large Magellanic Cloud (LMC) is uniquely suitable for the study of massive star clusters at all stages of evolution. By combining HST observations of these clusters with N-body models we hope to understand the origin and evolution of rich star clusters in our own Galaxy, in the LMC, and beyond. ... We aim to combine our HST observations with N-body models to understand the formation and evolution of globular clusters. ...

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• ESLAB 2007
• NICMOS/HST H-band (F160W) Images of the 30 Dor Starburst Cluster

home publications > mercury . ... Big Clusters, Tiny Galaxies . ... Astronomers struggle to understand why giant star clusters form in the tiniest of galaxies . ... These clusters are probably young versions of globular clusters, but they are commonly called super star clusters. Seven dwarf galaxies within 16 million light-years have formed super star clusters, with one of these galaxies, NGC 1569, possessing two young clusters. ... Super star clusters have a lot to tell us about star formation. ...

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• ASP: Globular Clusters and Satellite Galaxies: Companions to the Milky Way
• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: Astronomical Society of the Pacific Presents Pricilla and Bart Bok Awards

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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• GSAOI Super Star Clusters Science Page
• Julie Banfield | Astronomer
• Dougal Mackey - Research

... Ultraluminous X-ray sources (ULXs) are located in external galaxies, their X-ray luminosities (10 39 - 10 41 erg/s) are thousand times greater than those of brightest black holes in the Galaxy. ULXs may be supercritical accretion disks around black holes of stellar masses (~10 Solar masses) like that in SS433, or they may be a hypothetical intermediate-mass black holes (hundreds - thousands Solar masses) with standard accretion disks. ... 2) The ULX progenitors were ejected from the star clusters. ...

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• Galaxy sector, archive 2012
• important_en
• topic_en

... Neutrino radiation from collapsing galactic nuclei . The a model of a short-lived extremely powerful source of high energy neutrinos. ... A dense central stellar cluster in the galactic nucleus on the late stage of evolution consists of compact stars (neutron stars and stellar mass black holes). ... The particles are effectively accelerated in the cavern and, due to pp-collisions in the gas envelope, they produce high energy neutrinos. ...

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• Introduction