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Study of scattering characteristics of lunar equatorial region using Chandrayaan-1 Mini-SAR polarimetric data
Saran, Sriram; Das, Anup; Mohan, Shiv +1 more
The miniaturized synthetic aperture radar Mini-SAR onboard Indian Chandrayaan-1 mission was the first ever lunar orbiting SAR that acquired several data strips covering a wide variety of geological units over lunar equatorial and low latitude regions, some of which were not studied earlier at radar wavelengths. The Mini-SAR observations, complemen…
Plasma Turbulence in the Solar System
Narita, Y.
Compositional analysis of Hyperion with the Cassini Visual and Infrared Mapping Spectrometer
Clark, Roger N.; Cruikshank, Dale P.; Brad Dalton, J.
Compositional mapping of the surface of Hyperion using Cassini Visual and Infrared Mapping Spectrometer (VIMS) observations reveals a heterogeneous surface dominated by water ice accompanied by additional materials. Carbon dioxide, as evidenced by a prominent absorption band centered at 4.26 µm, is distributed over most of the surface, inclu…
Investigation of variability of iron emission lines in Centaurus X-3
Paul, Biswajit; Naik, Sachindra
We present the results obtained from a study of the variability of iron emission lines in the high mass X-ray binary pulsar Cen~X-3 during the eclipse, eclipse-egress and out-of-eclipse phases using XMM-Newton observations. Three iron emission lines at 6.4 keV, 6.7 keV, and 6.97 keV are clearly detected in the spectrum of the pulsar during the ent…
First simultaneous optical/near-infrared imaging of an X-ray selected, high-redshift cluster of galaxies with GROND. The galaxy population of XMMU J0338.7 + 0030 at z = 1.1
Böhringer, H.; Greiner, J.; Pratt, G. W. +28 more
Context. The XMM-Newton Distant Cluster Project is a serendipitous survey for clusters of galaxies at redshifts z ≥ 0.8 based on deep archival XMM-Newton observations. X-ray sources identified as extended are screened against existing optical all-sky surveys for galaxies, in case of candidate high-z clusters followed up with imaging at 4 m-class t…
Age and Structure Parameters of the Remote M31 Globular Cluster B514 Based on HST, 2MASS, GALEX, and BATC Observations
Fan, Zhou; Zhou, Xu; Ma, Jun +6 more
B514 is a remote M31 globular cluster (GC) which is located at a projected distance of Rp ~= 55 kpc. Deep observations with the Advanced Camera for Surveys on the Hubble Space Telescope are used to provide accurate integrated light and star counts of B514. By coupling the analysis of the distribution of the integrated light with star co…
Direct imaging of a massive dust cloud around R Coronae Borealis
Waters, L. B. F. M.; Jeffers, S. V.; Min, M. +5 more
We present recent polarimetric images of the highly variable star R CrB using ExPo and archival WFPC2 images from the HST. We observed R CrB during its current dramatic minimum where it decreased more than 9 mag due to the formation of an obscuring dust cloud. Since the dust cloud is only in the line-of-sight, it mimics a coronograph allowing the …
Adaptive Optics Observations of 3 µm Water Ice in Silhouette Disks in the Orion Nebula Cluster and M43
Tokunaga, Alan T.; Terada, Hiroshi; Pyo, Tae-Soo +9 more
We present the near-infrared images and spectra of four silhouette disks in the Orion Nebula Cluster (M42) and M43 using the Subaru Adaptive Optics system. While d053-717 and d141-1952 show no water ice feature at 3.1 µm, a moderately deep (τice ~ 0.7) water ice absorption is detected toward d132-1832 and d216-0939. Taking into ac…
Isolated starless cores in infrared dark clouds in the Hi-GAL survey
Peretto, N.; Elia, D.; Griffin, M. J. +15 more
In a previous paper, we identified cores within infrared dark clouds. We regarded those without embedded sources as the least evolved and labelled them starless. Here we identify the most isolated starless cores and model them using a three-dimensional multiwavelength Monte Carlo radiative transfer code. We derive the cores' physical parameters an…
Solar-cycle Variation of Sound Speed near the Solar Surface
Rabello-Soares, M. C.
We present evidence that the sound-speed variation with solar activity has a two-layer configuration, similar to the one observed below an active region, which consists of a negative layer near the solar surface and a positive one in the layer immediately below the first one. Frequency differences between the activity minimum and maximum of solar …