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Modeling specular reflections from hydrocarbon lakes on Titan
Nicholson, Philip D.; Sotin, Christophe; Barnes, Jason W. +9 more
During the 58th close flyby of Titan (T58), the Cassini Visual and Infrared Mapping Spectrometer (VIMS) observed a specular reflection of sunlight from Titan's Jingpo Lacus through the 5-µm methane window (Stephan, K. et al. [2010]. Geophys. Res. Lett. 37, L07104). The maximum intensity of this reflection is controlled by three basic factors…
Gas Density Profile in Dark Matter Halo in Chameleon Cosmology
Terukina, Ayumu; Yamamoto, Kazuhiro
We investigate the gas density, temperature, and pressure profiles in a dark matter halo under the influence of the chameleon force. We solve the hydrostatic equilibrium equation for the gas coupled with the chameleon field in an analytic manner, using an approximate solution for the chameleon field equation with the source term, with a generalize…
The Y SZ-YX Scaling Relation as Determined from Planck and Chandra
Vikhlinin, Alexey; More, Surhud; Rozo, Eduardo
Sunyaev-Zeldovich (SZ) clusters surveys, such as Planck, the South Pole Telescope, and the Atacama Cosmology Telescope, will soon be publishing several hundred SZ-selected systems. The key ingredient required to transport the mass calibration from current X-ray-selected cluster samples to these SZ systems is the Y SZ-YX scali…
Thermal and shape properties of asteroid (21) Lutetia from Herschel observations around the Rosetta flyby
Altieri, B.; Valtchanov, I.; Jorda, L. +22 more
Prior to and around the Rosetta flyby of (21) Lutetia, the Herschel Space Observatory performed a collaborative observation campaign with its two photometers observing the asteroid in the far infrared, at wavelengths not covered by Rosetta's instruments. The Herschel observations, fed into a thermophysical model (TPM) using as input a shape model …
The detection of globular clusters in galaxies as a data mining problem
Paolillo, Maurizio; Puzia, Thomas; Brescia, Massimo +2 more
We present an application of self-adaptive supervised learning classifiers derived from the machine learning paradigm to the identification of candidate globular clusters in deep, wide-field, single-band Hubble Space Telescope (HST) images. Several methods provided by the DAta Mining and Exploration (DAME) web application were tested and compared …
A New Code for Nonlinear Force-free Field Extrapolation of the Global Corona
Feng, Xueshang; Jiang, Chaowei; Xiang, Changqing
Reliable measurements of the solar magnetic field are still restricted to the photosphere, and our present knowledge of the three-dimensional coronal magnetic field is largely based on extrapolations from photospheric magnetograms using physical models, e.g., the nonlinear force-free field (NLFFF) model that is usually adopted. Most of the current…
V900 Mon and Thommes' Nebula: A New FUor in Monoceros
Reipurth, Bo; Aspin, Colin; Herbig, G. H.
Detailed observations of a recently recognized eruptive variable, V900 Mon, are presented. The star is located in the small cloud L1656, a little-studied region of modest star formation activity in Monoceros, and is presently at a magnitude of r ~ 16, surrounded by a bright compact reflection nebula, where only a 20th magnitude star was seen on th…
Spatial gradients from irregular, multiple-point spacecraft configurations
Dunlop, M. W.; Rème, H.; Liu, Z. X. +8 more
We present a generalized multipoint analysis of physical quantities, such as magnetic field and plasma flow, based on spatial gradient properties, where the multipoint data may be taken by irregular (distorted) configurations of any number of spacecraft. The methodology is modified from a previous, fully 3-D gradient analysis technique, designed t…
Globular cluster systems of early-type galaxies in low-density environments
Blakeslee, J. P.; Sharples, R. M.; Kundu, A. +4 more
Deep images of 10 early-type galaxies in low-density environments have been obtained with the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope. The global properties of the globular cluster (GC) systems of the galaxies have been derived in order to investigate the role of the environment in galaxy formation and evolution. Using …
Keck/NIRC2 Imaging of the Warped, Asymmetric Debris Disk around HD 32297
Currie, Thayne; Debes, John; Robitaille, Thomas +8 more
We present Keck/NIRC2 Ks -band high-contrast coronagraphic imaging of the luminous debris disk around the nearby, young A star HD 32297 resolved at a projected separation of r = 0farcs3-2farcs5 (≈35-280 AU). The disk is highly warped to the north and exhibits a complex, "wavy" surface brightness (SB) profile interior to r ≈ 110 AU, wher…