Search Publications
Titan's meridional wind profile and Huygens' orientation and swing inferred from the geometry of DISR imaging
Karkoschka, Erich
The altitude and zonal motion of the Huygens probe descending through Titan's atmosphere was determined early under the assumption of no meridional motion (Bird et al. [2005]. Nature 438, 800-802). By comparing images taken during the descent, Karkoschka et al. (Karkoschka et al. [2007]. Planet. Space Sci. 55, 1895-1935) determined the meridional …
The 6 µm Feature As a Tracer of Aliphatic Components of Interstellar Carbonaceous Grains
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao +1 more
An unidentified infrared emission (UIE) feature at 6.0 µm is detected in a number of astronomical sources showing the UIE bands. In contrast to the previous suggestion that this band is due to C=O vibrational modes, we suggest that the 6.0 µm feature arises from olefinic double-bond functional groups. These groups are likely to be atta…
Accretion disk winds in active galactic nuclei: X-ray observations, models, and feedback
Tombesi, F.
Powerful winds driven by active galactic nuclei (AGN) are often invoked to play a fundamental role in the evolution of both supermassive black holes (SMBHs) and their host galaxies, quenching star formation and explaining the tight SMBH-galaxy relations. A strong support of this ``quasar mode'' feedback came from the recent X-ray observation of a …
A novel method for surface exploration: Super-resolution restoration of Mars repeat-pass orbital imagery
Tao, Y.; Muller, J. -P.
Higher resolution imaging data of planetary surfaces is considered desirable by the international community of planetary scientists interested in improving understanding of surface formation processes. However, given various physical constraints from the imaging instruments through to limited bandwidth of transmission one needs to trade-off spatia…
The Circumgalactic Medium of Submillimeter Galaxies. I. First Results from a Radio-identified Sample
Cooray, A.; Fu, Hai; Michałowski, M. J. +14 more
We present the first results from an ongoing survey to characterize the circumgalactic medium (CGM) of massive high-redshift galaxies detected as submillimeter galaxies (SMGs). We constructed a parent sample of 163 SMG-QSO pairs with separations less than ∼36″ by cross-matching far-infrared-selected galaxies from Herschel with spectroscopically co…
Finest light curve details, physical parameters, and period fluctuations of CoRoT RR Lyrae stars
Derekas, A.; Szabó, R.; Sódor, Á. +1 more
The CoRoT satellite supplied the scientific community with a huge data base of variable stars. Among them the RR Lyrae stars have intensively been discussed in numerous papers in the last few years, but the latest runs have not been checked to find RR Lyrae stars up to now. Our main goal was to fill this gap and complete the CoRoT RR Lyrae sample.…
New Constraints on Spatial Variations of the Fine Structure Constant from Clusters of Galaxies
Ebeling, Harald; Kocevski, Dale; Martins, Carlos J. A. P. +1 more
We have constrained the spatial variation of the fine structure constant using multi-frequency measurements of the thermal Sunyaev-Zeldovich effect of 618 X-ray selected clusters. Although our results are not competitive with the ones from quasar absorption lines, we improved by a factor 10 and ∼2.5 previous results from Cosmic Microwave Backgroun…
Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks
Green, Joel D.; Su, Kate Y. L.; Bryden, Geoff +2 more
Observations from the Herschel Space Observatory have more than doubled the number of wide debris disks orbiting Sunlike stars to include over 30 systems with R > 100 AU. Here, we present new Herschel PACS and reanalyzed Spitzer MIPS photometry of five Sunlike stars with wide debris disks, from Kuiper Belt size to R > 150 AU. The disk surrou…
Search for a non-equilibrium plasma in the merging galaxy cluster Abell 754
Koyama, Katsuji; Hayashida, Kiyoshi; Tsunemi, Hiroshi +3 more
Abell 754 is a galaxy cluster in which an ongoing merger is evident on the plane of the sky, from the southeast to the northwest. We study the spatial variation of the X-ray spectra observed with Suzaku along the merging direction, centering on the Fe Ly α/Fe He α line ratio to search for possible deviation from ionization equilibrium. Fitting wit…
The Interplanetary Network Response to LIGO GW150914
Zhang, X.; Cline, T.; Hurley, K. +15 more
We have performed a blind search for a gamma-ray transient of arbitrary duration and energy spectrum around the time of the LIGO gravitational-wave event GW150914 with the six-spacecraft interplanetary network (IPN). Four gamma-ray bursts were detected between 30 hr prior to the event and 6.1 hr after it, but none could convincingly be associated …