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Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
Umana, G.; Moore, T. J. T.; Palmeirim, P. +35 more
We present a comprehensive statistical analysis of star-forming objects located in the vicinities of 1360 bubble structures throughout the Galactic plane and their local environments. The compilation of ~70 000 star-forming sources, found in the proximity of the ionized (HII) regions and detected in both Hi-GAL and GLIMPSE surveys, provided a broa…
Occurrence rate of whistler waves in the magnetotail reconnection region
Sahraoui, F.; Deng, X. H.; Huang, S. Y. +9 more
It has long been suggested that whistler waves play an active role during magnetic reconnection. However, all previous observations were based on case studies and could not give a detailed picture as to where the whistler waves occur in the reconnection region. In this paper, a statistical study by using the Cluster data is performed to investigat…
The Discovery of λ Bootis Stars: The Southern Survey I
Neff, J. E.; Cheng, K. -P.; Gray, R. O. +5 more
The λ Boo stars are a class of chemically peculiar Population I A-type stars characterized by under-abundances of the refractory elements, but near-solar abundances of carbon, nitrogen, oxygen, and sulfur. There is some evidence that λ Boo stars have higher frequencies of “bright” debris disks than normal A-type stars. The discovery of four exopla…
A concordant scenario to explain FU Orionis from deep centimeter and millimeter interferometric observations
Henning, Thomas; Dong, Ruobing; Tamura, Motohide +13 more
Aims: The aim of this work is to constrain properties of the disk around the archetype FU Orionis object, FU Ori, with as good as 25 au resolution.
Methods: We resolved FU Ori at 29-37 GHz using the Karl G. Jansky Very Large Array (JVLA) in the A-array configuration, which provided the highest possible angular resolution to date at this …
The Herschel Planetary Nebula Survey (HerPlaNS): A Comprehensive Dusty Photoionization Model of NGC6781
Villaver, Eva; Ueta, Toshiya; Szczerba, Ryszard +9 more
We perform a comprehensive analysis of the planetary nebula (PN) NGC 6781 to investigate the physical conditions of each of its ionized, atomic, and molecular gas and dust components and the object’s evolution, based on panchromatic observational data ranging from UV to radio. Empirical nebular elemental abundances, compared with theoretical predi…
Our evolving understanding of aeolian bedforms, based on observation of dunes on different worlds
Radebaugh, Jani; Tirsch, Daniela; Kreslavsky, Mikhail +3 more
Dunes, dune fields, and ripples are unique and useful records of the interaction between wind and granular materials - finding such features on a planetary surface immediately suggests certain information about climate and surface conditions (at least during the dunes' formation and evolution). Additionally, studies of dune characteristics under n…
Venus cloud-tracked and doppler velocimetry winds from CFHT/ESPaDOnS and Venus Express/VIRTIS in April 2014
Widemann, Thomas; Donati, Jean-François; Machado, Pedro +3 more
We present new coordinated observations and measurements of the wind amplitude and its variability at Venus cloud-tops based on the two complementary techniques of Ground-based Doppler velocimetry (Widemann et al., 2007, 2008; Machado et al., 2012, 2014) and cloud-tracked winds using ESA Venus Express/ VIRTIS-M imaging at 0.38 µm (Drossart e…
An observational study of dust nucleation in Mira (o Ceti). II. Titanium oxides are negligible for nucleation at high temperatures
Menten, K. M.; Müller, H. S. P.; Patel, N. A. +7 more
Context. The formation of silicate dust in oxygen-rich envelopes of evolved stars is thought to be initiated by the formation of seed particles that can withstand the high temperatures close to the stellar photosphere and act as condensation cores farther away from the star. TiO and TiO2 are among the candidate species considered as fir…
The Relationship Between Brightest Cluster Galaxy Star Formation and the Intracluster Medium in CLASH
Donahue, Megan; Moustakas, John; Postman, Marc +2 more
We study the nature of feedback mechanisms in the 11 CLASH brightest cluster galaxies (BCGs) that exhibit extended ultraviolet and nebular line emission features. We estimate star formation rates (SFRs), dust masses, and starburst durations using a Bayesian photometry-fitting technique that accounts for both stellar and dust emission from the UV t…
Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: implications for atmospheric escape on evolutionary timescales
Nilsson, Hans; Dandouras, Iannis; Slapak, Rikard +3 more
We have investigated the total O+ escape rate from the dayside open polar region and its dependence on geomagnetic activity, specifically Kp. Two different escape routes of magnetospheric plasma into the solar wind, the plasma mantle, and the high-latitude dayside magnetosheath have been investigated separately. The flux of O+