Search Publications
Elemental Abundances in the Possible Type Ia Supernova Remnant G344.7-0.1
Yamaguchi, H.; Tanaka, M.; Maeda, K. +5 more
Recent studies on the Galactic supernova remnant (SNR) G344.7-0.1 have commonly claimed its origin to be a core-collapse supernova (SN) explosion, based on its highly asymmetric morphology and/or proximity to a star-forming region. In this paper, however, we present an X-ray spectroscopic study of this SNR using Suzaku, which is supportive of a Ty…
Compositional investigation of the proposed chloride-bearing materials on Mars using near-infrared orbital data from OMEGA/MEx
Bibring, Jean-Pierre; Gondet, Brigitte; Poulet, François +7 more
Several hundred occurrences of chloride-bearing salt deposits have been proposed in terrains within the southern highlands of Mars on the basis of Thermal Emission Imaging System and Thermal Emission Spectrometer infrared observations. The spectral identification of chloride salts by remote sensing is challenging because they are transparent over …
X-ray Multi-mirror Mission (XMM-Newton) observatory
Schartel, Norbert; Lumb, David H.; Jansen, Fred A.
X-ray Multi-mirror Mission (XMM-Newton) has been one of the most successful astronomy missions launched by the European Space Agency. The mission exploits innovative use of replication technology for the x-ray reflecting telescopes that has resulted in an unprecedented combination of effective area and resolution. Three telescopes are equipped wit…
Deep Chandra Monitoring Observations of NGC 4649. II. Wide-field Hubble Space Telescope Imaging of the Globular Clusters
Brodie, Jean P.; Zezas, Andreas; Strader, Jay +7 more
We present g and z photometry and size estimates for globular clusters (GCs) in the massive Virgo elliptical NGC 4649 (M60) using a five-pointing Hubble Space Telescope/Advanced Camera for Surveys mosaic. The metal-poor GCs show a monotonic negative metallicity gradient of -0.43 ± 0.10 dex per dex in radius over the full radial range of the data, …
A Calibrated Measurement of the Near-IR Continuum Sky Brightness Using Magellan/FIRE
Simcoe, Robert A.; Sullivan, Peter W.
We characterize the near-IR sky background from 308 observations with the Folded-port InfraRed Echellette (FIRE) spectrograph at Magellan. A subset of 105 observations selected to minimize lunar and thermal effects gives a continuous, median spectrum from 0.83 to 2.5 µm, which we present in Table 2. The data are used to characterize the broa…
Deep Hubble Space Telescope Imaging in NGC 6397: Stellar Dynamics
Anderson, J.; Rich, R. M.; Dotter, A. +9 more
Multi-epoch observations with the Advanced Camera for Surveys on the Hubble Space Telescope provide a unique and comprehensive probe of stellar dynamics within NGC 6397. We are able to confront analytic models of the globular cluster with the observed stellar proper motions. The measured proper motions probe well along the main sequence from 0.8 t…
Hubble Space Telescope Narrowband Search for Extended Lyα Emission around Two z > 6 Quasars
Hennawi, Joseph F.; Strauss, Michael A.; Rix, Hans-Walter +8 more
We search for extended Lyα emission around two z > 6 quasars, SDSS J1030+0524 (z = 6.309) and SDSS J1148+5251 (z = 6.419) using Wide Field Camera 3 narrowband filters on board the Hubble Space Telescope. For each quasar, we collected two deep, narrowband images, one sampling the Lyα line+continuum at the quasar redshifts and one of the continuu…
First detection of O2 1.27 µm nightglow emission at Mars with OMEGA/MEX and comparison with general circulation model predictions
Gondet, B.; Montmessin, F.; Bertaux, J. L. +2 more
We report the first detection in the atmosphere of Mars of the nightside O2(a1Δg) emission at 1.27 µm from limb observations of the OMEGA imaging spectrometer on board Mars Express (MEX). The emission, detected in three cases out of 40 observations, is due to recombination in a downwelling air parcel of O ato…
The onset of high-mass star formation in the direct vicinity of the Galactic mini-starburst W43
Henning, Th.; Krause, O.; Beuther, H. +10 more
Context. The earliest stages of high-mass star formation are still poorly characterized. Densities, temperatures and kinematics are crucial parameters for simulations of high-mass star formation. It is also unknown whether the initial conditions vary with environment.
Aims: We want to investigate the youngest massive gas clumps in the environ…
Detectability of low-energy X-ray spectral components in type 1 active galactic nuclei
Mateos, S.; Stewart, G. C.; Scott, A. E.
In this paper we examine the percentage of type 1 active galactic nuclei (AGN) which require the inclusion of a soft excess component and/or significant cold absorption in the modelling of their X-ray spectra obtained by XMM-Newton. We do this by simulating spectra which mimic typical spectral shapes in order to find the maximum detectability expe…