Search Publications
The northern hemisphere of asteroid (21) Lutetia—topography and orthoimages from Rosetta OSIRIS NAC image data
Mottola, Stefano; Roatsch, Thomas; Matz, Klaus-Dieter +5 more
During the flyby at asteroid (21) Lutetia by the Rosetta spacecraft in July 2010, the OSIRIS imaging system onboard acquired several hundred images of Lutetia's surface. Images of the OSIRIS NAC (Narrow Angle Camera) comprise up to 60 m/pixel ground resolution. We analyzed 84 multi-spectral NAC images with stereo-photogrammetric methods. A 3D poin…
Direct Measurement of the X-Ray Time-delay Transfer Function in Active Galactic Nuclei
Turner, T. J.; Kraemer, S. B.; Reeves, J. N. +3 more
The origin of the observed time lags, in nearby active galactic nuclei (AGNs), between hard and soft X-ray photons is investigated using new XMM-Newton data for the narrow-line Seyfert I galaxy Ark 564 and existing data for 1H 0707-495 and NGC 4051. These AGNs have highly variable X-ray light curves that contain frequent, high peaks of emission. T…
Upper limits for H 2SO 4 in the mesosphere of Venus
Moriarty-Schieven, Gerald; Clancy, R. Todd; Sandor, Brad J.
Rapid temporal variability of SO 2 and SO in the Venus 85-100 km mesosphere ( Sandor, B.J., Clancy, R.T., Moriarty-Schieven G.H. [2007]. Bull. Am. Astron. Soc. 39, 503; Sandor, B.J., Clancy, R.T., Moriarty-Schieven, G.H., Mills, F.P. [2010]. Icarus 208, 49-60) requires in situ sources and sinks for these molecules. While many loss mecha…
A new super-soft X-ray source in the Small Magellanic Cloud: Discovery of the first Be/white dwarf system in the SMC?
Pietsch, W.; Haberl, F.; Mereghetti, S. +5 more
Context. The Small Magellanic Cloud (SMC) hosts a large number of Be/X-ray binaries, however no Be/white dwarf system is known so far, although population synthesis calculations predict that they might be more frequent than Be/neutron star systems.
Aims: XMMU J010147.5-715550 was found as a new faint super-soft X-ray source (SSS) with a likel…
Spectroscopic Confirmation of a z = 6.740 Galaxy behind the Bullet Cluster
Fontana, Adriano; Stiavelli, Massimo; Treu, Tommaso +7 more
We present the first results of our spectroscopic follow-up of 6.5 < z < 10 candidate galaxies behind clusters of galaxies. We report the spectroscopic confirmation of an intrinsically faint Lyman break galaxy (LBG) identified as a z 850LP-band dropout behind the Bullet Cluster. We detect an emission line at λ = 9412 Å at >5σ s…
A statistical comparison of solar wind propagation delays derived from multispacecraft techniques
Wild, J. A.; Case, N. A.
We present a large-scale statistical study of the solar wind propagation delay between NASA's Advanced Composition Explorer spacecraft and ESA's Cluster 1 spacecraft. This study focuses on those periods when Cluster was within the unimpeded solar wind, upstream of the bow shock nose, between 2001 and 2010. Using a cross-correlation method to compa…
A KS and IRAC Selection of High-redshift Extremely Red Objects
Wang, Wei-Hao; Cowie, Lennox L.; Barger, Amy J.
In order to find the most extreme dust-hidden high-redshift galaxies, we select 196 extremely red objects in the KS and Infrared Array Camera (IRAC) bands (KIEROs, [Ks - 4.5 µm]AB > 1.6) in the 0.06 deg2 Great Observatories Origins Deep Surveys-North (GOODS-N) region. This selection avoids the B…
Herschel-PACS observations of [O I]63 µm towards submillimetre galaxies at z ∼ 1
Ivison, R. J.; Menten, K. M.; Smail, Ian +22 more
We present Herschel-PACS spectroscopy of the [O I]63 µm far-infrared cooling line from a sample of six unlensed and spectroscopically confirmed 870 µm selected submillimetre (submm) galaxies (SMGs) at 1.1 < z < 1.6 from the LABOCA Extended Chandra Deep Field South (ECDFS) Submm Survey (LESS). This is the first survey of [O I]63 &…
Spectroscopic Observations of Fe XVIII in Solar Active Regions
Teriaca, Luca; Warren, Harry P.; Curdt, Werner
The large uncertainties associated with measuring the amount of high temperature emission in solar active regions (ARs) represents a significant impediment to making progress on the coronal heating problem. Most current observations at temperatures of 3 MK and above are taken with broadband soft X-ray instruments. Such measurements have proven dif…
Timing and broad-band spectroscopy of 1A 1118-61 with Suzaku
Maitra, Chandreyee; Paul, Biswajit; Naik, Sachindra
We present a timing and broad-band pulse-phase-resolved spectral analysis of the transient Be X-ray binary pulsar 1A 1118-61 observed during its outburst in 2009 January using Suzaku observations. The Suzaku observations were made twice, once at the peak of the outburst, and the other 13 d later at its declining phase. Pulse profiles from both obs…