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Recovering star formation histories: Integrated-light analyses vs. stellar colour-magnitude diagrams
Koleva, M.; Alloin, D.; Monelli, M. +12 more
Context. Accurate star formation histories (SFHs) of galaxies are fundamental for understanding the build-up of their stellar content. However, the most accurate SFHs - those obtained from colour-magnitude diagrams (CMDs) of resolved stars reaching the oldest main-sequence turnoffs (oMSTO) - are presently limited to a few systems in the Local Grou…
One Plane for All: Massive Star-forming and Quiescent Galaxies Lie on the Same Mass Fundamental Plane at z ~ 0 and z ~ 0.7
van Dokkum, Pieter G.; Franx, Marijn; Bezanson, Rachel
Scaling relations between galaxy structures and dynamics have been studied extensively for early- and late-type galaxies, both in the local universe and at high redshifts. The abundant differences between the properties of disky and elliptical, or star-forming and quiescent, galaxies seem to be characteristic of the local universe; such clear dist…
Characteristics of ice grains in the Enceladus plume from Cassini observations
Ye, S. -Y.; Dong, Y.; Hill, T. W.
Ice grains in the Enceladus plume have been observed by several Cassini instruments during many Enceladus encounters. In this paper we study the ice grains ranging from less than one nanometer to micrometers in size based on multiple instrument observations. We have analyzed the nanograin data from the E17 and E18 Cassini Plasma Spectrometer (CAPS…
Cool Transition Region Loops Observed by the Interface Region Imaging Spectrograph
Madjarska, Maria S.; Li, Bo; Xia, Lidong +1 more
We report on the first Interface Region Imaging Spectrograph (IRIS) study of cool transition region loops, a class of loops that has received little attention in the literature. A cluster of such loops was observed on the solar disk in active region NOAA11934, in the Si iv 1402.8 Å spectral raster and 1400 Å slit-jaw images. We divide the loops in…
Missing cosmic metals revealed by X-ray absorption towards distant sources
Ferrara, Andrea; Pallottini, Andrea; Salvaterra, Ruben +1 more
The census of heavy elements (metals) produced by all stars through cosmic times up to present-day is limited to ≲ 50%; of these only half are still found within their parent galaxy. The majority of metals is expelled from galaxies into the circumgalactic (or even more distant, intergalactic) space by powerful galactic winds, leaving unpleasant un…
A new view on the solar wind interaction with the Moon
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +9 more
Characterised by a surface bound exosphere and localised crustal magnetic fields, the Moon was considered as a passive object when solar wind interacts with it. However, the neutral particle and plasma measurements around the Moon by recent dedicated lunar missions, such as Chandrayaan-1, Kaguya, Chang'E-1, LRO, and ARTEMIS, as well as IBEX have r…
Peculiar Velocities of Galaxies in the Leo Spur
Tully, R. Brent; Karachentsev, Igor D.; Makarov, Dmitry I. +2 more
The Hubble Space Telescope Advanced Camera for Surveys has been used to determine accurate distances for the spiral galaxy NGC 2683 and 12 other galaxies in a zone of the “local velocity anomaly” from luminosity measurements of the brightest red giant branch stars. These galaxies lie in the Leo Spur, the nearest filament beyond our Local Sheet. Th…
Analysis of a coronal mass ejection and corotating interaction region as they travel from the Sun passing Venus, Earth, Mars, and Saturn
Harra, L. K.; Arridge, C. S.; Matthews, S. A. +2 more
During June 2010 a good alignment in the solar system between Venus, STEREO-B, Mars, and Saturn provided an excellent opportunity to study the propagation of a coronal mass ejection (CME) and closely occurring corotating interaction region (CIR) from the Sun to Saturn. The CME erupted from the Sun at 01:30 UT on 20 June 2010,with v≈ 600 km s-…
Dust attenuation up to z ≃ 2 in the AKARI North Ecliptic Pole Deep Field
Ciesla, L.; Buat, V.; Burgarella, D. +13 more
Aims: We aim to study the evolution of dust attenuation in galaxies selected in the infrared (IR) in the redshift range in which they are known to dominate the star formation activity in the universe. The comparison with other measurements of dust attenuation in samples selected using different criteria will give us a global picture of the at…
X-ray bright active galactic nuclei in massive galaxy clusters - III. New insights into the triggering mechanisms of cluster AGN
Brandt, W. N.; von der Linden, A.; Xue, Y. Q. +6 more
We present the results of a new analysis of the X-ray selected active galactic nuclei (AGN) population residing in and behind 135 of the most massive galaxy clusters in the redshift range of 0.2 < z < 0.9 observed with Chandra. With a sample of more than 11 000 X-ray point sources, we are able to measure, for the first time, evidence for evo…