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Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift
Ravindranath, Swara; Elmegreen, Bruce G.; Elmegreen, Debra Meloy +1 more
The photometric redshift distributions, spectral types, Sérsic indices, and sizes of all resolved galaxies in the Hubble Space Telescope Ultra Deep Field (UDF) are studied in order to understand the environment and nature of star formation in the early universe. Clumpy disk galaxies that are bright at short wavelengths (rest-frame λ<5000 Å) dom…
The XMM-Newton Wide-Field Survey in the COSMOS Field. I. Survey Description
Finoguenov, A.; Sanders, D. B.; Fiore, F. +21 more
We present the first set of XMM-Newton EPIC observations in the 2 deg2 COSMOS field. The strength of the COSMOS project is the unprecedented combination of a large solid angle and sensitivity over the whole multiwavelength spectrum. The XMM-Newton observations are very efficient in localizing and identifying active galactic nuclei (AGNs…
The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
We analyze the luminosity function of the globular clusters (GCs) belonging to the early-type galaxies observed in the ACS Virgo Cluster Survey. We have obtained maximum likelihood estimates for a Gaussian representation of the globular cluster luminosity function (GCLF) for 89 galaxies. We have also fit the luminosity functions with an ``evolved …
The Infrared Luminosity Function of Galaxies at Redshifts z = 1 and z ~ 2 in the GOODS Fields
Le Floc'h, E.; Dole, H.; Helou, G. +6 more
We present the rest-frame 8 µm LF at redshifts z=1 and ~2, computed from Spitzer 24 µm-selected galaxies in the GOODS fields over an area of 291 arcmin2. Using classification criteria based on X-ray data and IRAC colors, we identify the AGNs in our sample. The rest-frame 8 µm LFs for star-forming galaxies at redshifts …
The Far-Infrared Surveyor (FIS) for AKARI
Lee, H. M.; White, G. J.; Wang, L. +57 more
The Far-Infrared Surveyor (FIS) is one of two focal-plane instruments on the AKARI satellite. FIS has four photometric bands at 65, 90, 140, and 160 µm, and uses two kinds of array detectors. The FIS arrays and optics are designed to sweep the sky with high spatial resolution and redundancy. The actual scan width is more than eight arcminutes, and…
A Characteristic Magnetic Field Pattern Associated with All Major Solar Flares and Its Use in Flare Forecasting
Schrijver, Carolus J.
Solar flares result from some electromagnetic instability that occurs within regions of relatively strong magnetic field in the Sun's atmosphere. The processes that enable and trigger these flares remain topics of intense study and debate. I analyze observations of 289 X- and M-class flares and over 2500 active region magnetograms to discover (1) …
In-Orbit Performance of the Hard X-Ray Detector on Board Suzaku
Isobe, Naoki; Enoto, Teruaki; Yamaoka, Kazutaka +55 more
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide energy bandpass of 10-600keV, energy resolutions of ∼4keV (FWHM) at 40keV and ∼11% at 511keV, and a high background rejection efficiency, have been confirmed by extensive in…
The Third IBIS/ISGRI Soft Gamma-Ray Survey Catalog
Götz, D.; Hill, A. B.; Walter, R. +20 more
In this paper we report on the third soft gamma-ray source catalog obtained with the IBIS/ISGRI gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 40 Ms of high-quality observations performed during the first 3.5 yr of Core Program and public IBIS/ISGRI observations. Compared to previous IBIS/ISGRI surv…
In situ evidence of magnetic reconnection in turbulent plasma
André, M.; Vaivads, A.; Owen, C. J. +3 more
Magnetic reconnection is a universal process leading to energy conversion in plasmas. It occurs in the Solar System, in laboratory plasmas and is important in astrophysics . Reconnection has been observed so far only at large-scale boundaries between different plasma environments . It is not known whether reconnection occurs and is important in tu…
Antarctic dry valleys: Microclimate zonation, variable geomorphic processes, and implications for assessing climate change on Mars
Head, James W.; Marchant, David R.
The Antarctic Dry Valleys (ADV) are generally classified as a hyper-arid, cold-polar desert. The region has long been considered an important terrestrial analog for Mars because of its generally cold and dry climate and because it contains a suite of landforms at macro-, meso-, and microscales that closely resemble those occurring on the martian s…