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Low-end mass function of the Quintuplet cluster
Kim, Sungsoo S.; Shin, Jihye
The Quintuplet and Arches clusters, which were formed in the harsh environment of the Galactic Centre (GC) a few million years ago, have been excellent targets for studying the effects of a star-forming environment on the initial mass function (IMF). In order to estimate the shape of the low-end IMF of the Arches cluster, Shin & Kim devised a …
Compact stellar systems in the polar ring galaxies NGC 4650A and NGC 3808B: Clues to polar disk formation
Georgiev, Iskren Y.; Goudfrooij, Paul; Puzia, Thomas H. +2 more
Context. Polar ring galaxies (PRGs) are composed of two kinematically distinct and nearly orthogonal components, a host galaxy (HG) and a polar ring/disk (PR). The HG usually contains an older stellar population than the PR. The suggested formation channel of PRGs is still poorly constrained. Suggested options are merger, gas accretion, tidal inte…
A simple model for understanding the DIM dust measurement at comet 67P/Churyumov-Gerasimenko
Flandes, Alberto; Krüger, Harald; Della Corte, Vincenzo +1 more
We present a simple model for gas and dust flow from 67P/Churyumov-Gerasimenko that can be used to understand the grain impact observed by the DIM instrument on Philae (Krüger et al., 2015). We show how model results when applied to the GIADA measurements (Rotundi et al., 2015; Della Corte et al., 2015) can be used, in conjunction with the results…
The Gray Extinction of the Ionizing Cluster in NGC 3603 from Ultraviolet to Optical Wavelengths
Grebel, Eva K.; Pang, Xiaoying; Pasquali, Anna
We use photometry in the F220W, F250W, F330W, F435W filters from the High Resolution Channel of the Advanced Camera for Surveys and photometry in the F555W, F675W, and F814W filters from the Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope to derive individual stellar reddenings and extinctions for stars in the HD 97950 cluster …
Incomplete cooling down of Saturn's A ring at solar equinox: Implication for seasonal thermal inertia and internal structure of ring particles
Spilker, Linda; Deau, Estelle; Morishima, Ryuji +2 more
At the solar equinox in August 2009, the Composite Infrared Spectrometer (CIRS) onboard Cassini showed the lowest Saturn's ring temperatures ever observed. Detailed radiative transfer models show that the observed equinox temperatures of Saturn's A ring are much higher than model predictions as long as only the flux from Saturn is taken into accou…
Near-infrared spectra of liquid/solid acetylene under Titan relevant conditions and implications for Cassini/VIMS detections
Le Mouélic, S.; Cornet, T.; McCord, T. B. +6 more
Acetylene is thought to be abundant on Titan according to most photochemical models. While detected in the atmosphere, its likely presence at the surface still lacks physical evidence. It is thought that solid acetylene could be a major component of Titan's lakes shorelines and dry lakebed, detected as the 5 µm-bright deposits with the Cassi…
Evidence for Non-stellar Rest-frame Near-IR Emission Associated with Increased Star Formation in Galaxies at z ~ 1
van Dokkum, Pieter G.; Franx, Marijn; Brammer, Gabriel +5 more
We explore the presence of non-stellar rest-frame near-IR (2-5 µm) emission in galaxies at z ∼ 1. Previous studies identified this excess in relatively small samples and suggested that such non-stellar emission, which could be linked to the 3.3 µm polycyclic aromatic hydrocarbons feature or hot dust emission, is associated with an incr…
Ground-based observation of the cyclic nature and temporal variability of planetary-scale UV features at the Venus cloud top level
Watanabe, Makoto; Imai, Masataka; Takahashi, Yukihiro +4 more
A planetary-scale bright and dark UV feature, known as the ;Y-feature,; rotates around Venus with a period of 4-5 days and has been long-time interpreted as planetary waves. When assuming this, its rotation period and spatial structure might help to understand the propagation of the planetary-scale waves and find out their role in the acceleration…
Data processing and visualisation in the Rosetta Science Ground Segment
Geiger, Bernhard
Rosetta is the first space mission to rendezvous with a comet. The spacecraft encountered its target 67P/Churyumov-Gerasimenko in 2014 and currently escorts the comet through a complete activity cycle during perihelion passage. The Rosetta Science Ground Segment (RSGS) is in charge of planning and coordinating the observations carried out by the s…
The extreme ultraviolet spectra of low-redshift radio-loud quasars
O'Dea, Christopher P.; Punsly, Brian; Reynolds, Cormac +1 more
This paper reports on the extreme ultraviolet (EUV) spectrum of three low-redshift (z ∼ 0.6) radio-loud quasars, 3C 95, 3C 57 and PKS 0405-123. The spectra were obtained with the Cosmic Origins Spectrograph of the Hubble Space Telescope. The bolometric thermal emission, Lbol, associated with the accretion flow is a large fraction of the…