Search Publications
Episodic Star Formation Coupled to Reignition of Radio Activity in 3C 236
Koekemoer, Anton M.; Baum, Stefi A.; O'Dea, Christopher P. +4 more
We present Hubble Space Telescope Advanced Camera for Surveys and STIS FUV/NUV/optical imaging of the radio galaxy 3C 236, whose relic ~4 Mpc radio jet lobes and inner 2 kpc compact steep spectrum (CSS) radio source are evidence of multiple epochs of active galactic nucleus (AGN) activity. Consistent with previous results, our data confirm the pre…
Modification of the plasma in the near-vicinity of Enceladus by the enveloping dust
Gurnett, D. A.; Tokar, R. L.; Johnson, R. E. +7 more
The plasma near Saturn's equator is quasi-corotating, but those fluid elements entering the near-vicinity of the moon Enceladus become uniquely modified. Besides the solid body, the Moon has a surrounding dust envelop that we show herein to be detected ∼20 Enceladus radii (1 RE = 252 km) both north and south of the body. Previous report…
Are the basins of Titan's Hotei Regio and Tui Regio sites of former low latitude seas?
Moore, Jeffrey M.; Howard, Alan D.
Features observed in the low-latitude basins of Hotei Regio and Tui Regio on Titan have attracted the attention of the Cassini-era investigators. At both locations, Visual Infrared Mapping Spectrometer (VIMS) observed isolated 5-µm bright ∼500 km wide features described as lobate in shape. Several studies have proposed that these materials a…
Amazonian geologic history of the Echus Chasma and Kasei Valles system on Mars: New data and interpretations
Mangold, Nicolas; van Gasselt, Stephan; Neukum, Gerhard +6 more
New high-resolution datasets have prompted a mapping-based study of the 2500-km-long Echus Chasma and Kasei Valles system that utilizes geomorphic details, stratigraphic relations, and cratering statistics derived from the new datasets. Our results suggest that between the Hesperian and Amazonian Epochs on Mars (3.7 Ga to Recent), the study area w…
The Geometry and Ionization Structure of the Wind in the Eclipsing Nova-like Variables RW Tri and UX UMa
Long, Knox S.; Knigge, Christian; Noebauer, Ulrich M. +1 more
The UV spectra of nova-like variables are dominated by emission from the accretion disk, modified by scattering in a wind emanating from the disk. Here, we model the spectra of RW Tri and UX UMa, the only two eclipsing nova-like variables which have been observed with the Hubble Space Telescope in the far-ultraviolet, in an attempt to constrain th…
Detection of an X-ray Pulsation for the Gamma-Ray Pulsar Centered in CTA 1
Takata, J.; Kong, A. K. H.; Hui, C. Y. +3 more
We report the detection of X-ray pulsations with a period of ~315.87 ms from the 2009 XMM-Newton observation for the radio-quiet γ-ray pulsar, LAT PSR J0007+7303, centered in the supernova remnant CTA 1. The detected pulsed period is consistent with the γ-ray periodicity at the same epoch found with the Fermi Gamma-ray Space Telescope. The broader…
Cool gas and dust in M 33: Results from the HERschel M 33 Extended Survey (HERM33ES)
Boquien, M.; Braine, J.; Calzetti, D. +23 more
We present an analysis of the first space-based far-IR-submm observations of M 33, which measure the emission from the cool dust and resolve the giant molecular cloud complexes. With roughly half-solar abundances, M 33 is a first step towards young low-metallicity galaxies where the submm may be able to provide an alternative to CO mapping to meas…
Constraints on star-forming galaxies at z >= 6.5 from HAWK-I Y-band imaging of GOODS-South
Bunker, Andrew; Jarvis, Matt J.; Hickey, Samantha +2 more
We present the results of our search for high-redshift Lyman-break galaxies over the GOODS-South field. We use Hubble Space Telescope (HST)-ACS data in B, V, i' & z', Very Large Telescope (VLT)-ISAAC J and Ks, Spitzer-Infrared Array Camera (IRAC) 3.6, 4.5, 5.8 and 8.0 µm data in conjunction with the new HAWK-I Y-band science verification…
Final verdict from XMM-Newton: the X-ray obscured Seyfert galaxy NGC 5506 has a broad Fe Kα line
Bianchi, S.; Guainazzi, M.; Dadina, M. +4 more
We present the first unambiguous evidence of a broad (Gaussian width ~330 eV) component of the iron Kα fluorescent emission line in the X-ray obscured narrow-line Seyfert 1 galaxy, NGC 5506. This is the main result of a spectroscopic monitoring campaign on this source, performed with the XMM-Newton observatory between 2001 February and …
The lensing efficiencies of MACS X-ray-selected versus RCS optically selected galaxy clusters
Maoz, Dan; Bartelmann, Matthias; Ebeling, Harald +2 more
The statistics of strongly lensed arcs in samples of galaxy clusters provide information on cluster structure that is complementary to that from individual clusters. However, samples of clusters that have been analysed to date have been either small, heterogeneous or observed with limited angular resolution. We measure the lensed-arc statistics of…