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We have identified 335 galaxy cluster and group candidates, 106 of which are at z > 1, using a 4.5µm selected sample of objects from a 7.25 deg 2 region in the Spitzer Infrared Array Camera (IRAC) Shallow Survey. Clusters were identified as 3-dimensional overdensities using a wavelet algorithm, based on photometric – 2 – redshift probability distributions(More)
BACKGROUND The benefits of sport are well recognized, but many activities carry a sport-specific injury risk. Snowboarding has become an increasingly popular winter sport in Austria in recent years, with an estimated 900,000 participants annually. Roughly 6,000 of these suffer from injury and up to 2,000 sustain moderate or severe wrist injuries (mainly(More)
The Infrared Array Camera (IRAC) is one of three focal plane instruments on the Spitzer Space Telescope. IRAC is a four-channel camera that obtains simultaneous broadband images at 3.6, 4.5, 5.8, and 8.0 m. Two nearly adjacent 5A2 ; 5A2 fields of view in the focal plane are viewed by the four channels in pairs (3.6 and 5.8 m; 4.5 and 8 m). All four detector(More)
In this the first of a series of Letters, we present a panchromatic data set in the Extended Groth Strip region of the sky. Our survey, the All-Wavelength Extended Groth Strip International Survey (AEGIS), aims to study the physical properties and evolutionary processes of galaxies at . It includes the following deep, wide-field imaging data sets: z ∼ 1(More)
We report the discovery of an X-ray luminous galaxy cluster at z = 1.26. RXJ0848.9+4452 was selected as an X-ray cluster candidate in the ROSAT Deep Cluster Survey, on the basis of its spatial extent. Deep optical and near-IR imaging have revealed a galaxy overdensity around the peak of the X-ray – 2 – emission, with a significant excess of red objects with(More)
For four centuries new technology and telescopes of increasing diameter have driven astronomical discovery for the simple reason that astronomy is a photon-limited field. The Hubble Space Telescope (HST), to date the largest UV/optical astronomical space telescope, has demonstrated the breadth of fundamental astrophysics that can be extracted from(More)
Unresolved anisotropies of the cosmic near-infrared background radiation are expected to have contributions from the earliest galaxies during the epoch of reionization and from faint, dwarf galaxies at intermediate redshifts. Previous measurements were unable to pinpoint conclusively the dominant origin because they did not sample spatial scales that were(More)
Using the deep Spitzer Infrared Array Camera (IRAC) observations of the Great Observatories Origins Deep Survey (GOODS), we study the stellar masses and star formation histories of galaxies at z ≈ 6. The IRAC instrument provides the best opportunity to estimate the stellar masses of galaxies at these redshifts because it samples their rest-frame optical(More)
We use data from the first epoch of observations with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope for the Great Observatories Origins Deep Survey (GOODS) to detect and study a collection of Lyman-break galaxies at z ≈ 6 to 5 in the Hubble Ultradeep Field (HUDF), six of which have spectroscopic confirmation. At these redshifts, IRAC(More)