Search Publications
The spectral energy distribution of the central parsecs of the nearest AGN
Meisenheimer, K.; Tristram, K. R. W.; Prieto, M. A. +4 more
Spectral energy distributions (SEDs) of the central few tens of parsec region of some of the nearest, most well-studied, active galactic nuclei (AGN) are presented. These genuine AGN-core SEDs, mostly from Seyfert galaxies, are characterized by two main features: an infrared (IR) bump with the maximum in the 2-10µm range and an increasing X-…
The ACS LCID Project. VI. The Star Formation History of The Tucana dSph and The Relative Ages of the Isolated dSph Galaxies
Dolphin, A. E.; Hidalgo, S. L.; Mayer, L. +10 more
We present a detailed study of the star formation history (SFH) of the Tucana dwarf spheroidal galaxy. High-quality, deep HST/ACS data, collected in the framework of the LCID project, allowed us to obtain the deepest color-magnitude diagram to date, reaching the old main-sequence turnoff (F814 ~ 29) with good photometric accuracy. Our analysis, ba…
Color imaging of Mars by the High Resolution Imaging Science Experiment (HiRISE)
Tornabene, Livio L.; Bridges, Nathan T.; Thomas, Nicolas +13 more
HiRISE has been producing a large number of scientifically useful color products of Mars and other planetary objects. The three broad spectral bands, coupled with the highly sensitive 14 bit detectors and time delay integration, enable detection of subtle color differences. The very high spatial resolution of HiRISE can augment the mineralogic int…
Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission
Katsuda, Satoru; Kunieda, Hideyo; Makishima, Kazuo +10 more
We show that the expansion of ejecta in Tycho's supernova remnant (SNR) is consistent with a spherically symmetric shell, based on Suzaku measurements of the Doppler broadened X-ray emission lines. All of the strong Kα line emissions show broader widths at the center than at the rim, while the centroid energies are constant across the remnant (exc…
Distribution and interplay of geologic processes on Titan from Cassini radar data
Stiles, B.; Callahan, P.; Cassini RADAR Team +23 more
The Cassini Titan Radar Mapper is providing an unprecedented view of Titan's surface geology. Here we use Synthetic Aperture Radar (SAR) image swaths (Ta-T30) obtained from October 2004 to December 2007 to infer the geologic processes that have shaped Titan's surface. These SAR swaths cover about 20% of the surface, at a spatial resolution ranging…
VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. II. Evidence for shock ionization caused by tidal forces in the extra-nuclear regions of interacting and merging LIRGs
Colina, L.; Monreal-Ibero, A.; Arribas, S. +3 more
Context. Luminous infrared galaxies (LIRGs) are an important class of objects in the low-z universe bridging the gap between normal spirals and the strongly interacting and starbursting ultraluminous infrared galaxies (ULIRGs). Since a large fraction of the stars in the Universe have been formed in these objects, LIRGs are also relevant in a high-…
The Dust-scattering X-ray Rings of the Anomalous X-ray Pulsar 1E 1547.0-5408
Tiengo, A.; Götz, D.; Mereghetti, S. +14 more
On 2009 January 22 numerous strong bursts were detected from the anomalous X-ray pulsar 1E 1547.0-5408. Swift/XRT and XMM-Newton/EPIC observations carried out in the following two weeks led to the discovery of three X-ray rings centered on this source. The ring radii increased with time following the expansion law expected for a short impulse of X…
A collision in 2009 as the origin of the debris trail of asteroid P/2010A2
Carry, Benoit; Weissman, Paul R.; Tubiana, Cecilia +16 more
The peculiar object P/2010A2 was discovered in January 2010 and given a cometary designation because of the presence of a trail of material, although there was no central condensation or coma. The appearance of this object, in an asteroidal orbit (small eccentricity and inclination) in the inner main asteroid belt attracted attention as a potentia…
Three-dimensional Morphology of a Coronal Prominence Cavity
Seaton, D. B.; Schmieder, B.; de Toma, G. +16 more
We present a three-dimensional density model of coronal prominence cavities, and a morphological fit that has been tightly constrained by a uniquely well-observed cavity. Observations were obtained as part of an International Heliophysical Year campaign by instruments from a variety of space- and ground-based observatories, spanning wavelengths fr…
NGC 404: A Rejuvenated Lenticular Galaxy on a Merger-induced, Blueward Excursion Into the Green Valley
Madore, Barry F.; Rich, R. Michael; Gil de Paz, Armando +14 more
We have discovered recent star formation in the outermost portion ((1-4) × R 25) of the nearby lenticular (S0) galaxy NGC 404 using Galaxy Evolution Explorer UV imaging. FUV-bright sources are strongly concentrated within the galaxy's H I ring (formed by a merger event according to del Río et al.), even though the average gas density is…