Search Publications
Star formation in a stellar mass-selected sample of galaxies to z= 3 from the GOODS-NICMOS Survey
Conselice, C. J.; Pérez-González, P. G.; Buitrago, F. +4 more
We present a study of the star-forming properties of a stellar mass-selected sample of galaxies in the GOODS (Great Observatories Origins Deep Survey) NICMOS Survey (GNS), based on deep Hubble Space Telescope (HST) imaging of the GOODS North and South fields. Using a stellar mass-selected sample, combined with HST/ACS and Spitzer data to measure b…
Compositional diversity at Theophilus Crater: Understanding the geological context of Mg-spinel bearing central peaks
Head, J. W.; Dhingra, D.; Pieters, C. M. +3 more
Analysis of high resolution Moon Mineralogy Mapper (M3) data reveals the presence of a prominent Mg-spinel-rich lithology in the central peaks of Theophilus crater on the lunar nearside. Other peak-associated lithologies are comprised of plagioclase, olivine, and pyroxene-bearing materials. A consistent spatial association of Mg-spinel …
The rapid X-ray variability of NGC 4051
Nandra, K.; Vaughan, S.; Uttley, P. +2 more
We present an analysis of the high-frequency X-ray variability of NGC 4051 (MBH∼ 1.7 × 106 M⊙) based on a series of XMM-Newton observations taken in 2009 with a total exposure of ∼570 ks (EPIC pn). These data reveal the form of the power spectrum over frequencies from 10-4 Hz, below the previously detect…
η Carinae: a very large hadron collider
Farnier, C.; Walter, R.; Leyder, J. -C.
Context. η Carinae is the colliding wind binary with the highest mass-loss rate in our Galaxy and the only one in which hard X-ray emission has been detected.
Aims: η Carinae is therefore a primary candidate to search for particle acceleration by probing its gamma-ray emission.
Methods: We used the first 21 months of Fermi/LAT data to ex…
A Compton-thick Active Galactic Nucleus at z ~ 5 in the 4 Ms Chandra Deep Field South
Ptak, A.; Brandt, W. N.; Fiore, F. +13 more
We report the discovery of a Compton-thick active galactic nucleus (AGN) at z = 4.76 in the 4 Ms Chandra Deep Field South. This object was selected as a V-band dropout in HST/ACS images and previously recognized as an AGN from optical spectroscopy. The 4 Ms Chandra observations show a significant (~4.2σ) X-ray detection at the V-band dropout posit…
X-Ray and Near-Infrared Observations of GX 339-4 in the Low/Hard State with Suzaku and IRSF
Nagata, Tetsuya; Yamaoka, Kazutaka; Ueda, Yoshihiro +10 more
X-ray and near-infrared (
X-ray Emission from Two Infrared-selected Galaxy Clusters at z > 1.4 in the IRAC Shallow Cluster Survey
Stern, D.; Vikhlinin, A.; Dey, A. +17 more
We report the X-ray detection of two z > 1.4 infrared-selected galaxy clusters from the IRAC Shallow Cluster Survey (ISCS). We present new data from the Hubble Space Telescope and the W. M. Keck Observatory that spectroscopically confirm cluster ISCS J1432.4+3250 at z = 1.49, the most distant of 18 confirmed z > 1 clusters in the ISCS to dat…
Construction of magnetic reconnection in the near-Earth magnetotail with Geotail
Fujimoto, M.; Shinohara, I.; Matsuoka, A. +3 more
The Geotail spacecraft made in situ observations of magnetic reconnection on 15 May 2003 in the near-Earth magnetotail at a radial distance of 28 RE when a moderate substorm started on the ground. For this event, the intense cross-tail electron current layer was detected in association with the simultaneous plasma flow and magnetic fiel…
X-Ray Spectrum of a Peculiar Supernova Remnant, G359.1-0.5
Yamaguchi, Hiroya; Koyama, Katsuji; Tsuru, Takeshi Go +3 more
We present Suzaku results of a supernova remnant (SNR), G 359.1-0.5, in the direction of the Galactic center region. From the SNR, we have found prominent K-shell lines of highly ionized Si and S ions, together with unusual structures at 2.5-3.0 and 3.1-3.6 keV. No canonical SNR plasma model, in either ionization equilibrium or under-ionization, c…
Two-dimensional Hα kinematics of bulgeless disc galaxies
Böker, Torsten; Neumayer, Nadine; Rix, Hans-Walter +3 more
We present two-dimensional Hα velocity fields for 20 late-type, disc-dominated spiral galaxies, the largest sample to date with high-resolution Hα velocity fields for bulgeless discs. From these data, we derive rotation curves and the location of the kinematic centres. The galaxy sample was selected to contain nucleated and non-nucleated galaxies …