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Hektor - an exceptional D-type family among Jovian Trojans
Nesvorný, D.; Brož, M.; Durda, D. D. +4 more
In this work, we analyse Jovian Trojans in the space of suitable resonant elements and we identify clusters of possible collisional origin by two independent methods: the hierarchical clustering and a so-called randombox. Compared to our previous work, we study a twice larger sample. Apart from Eurybates, Ennomos and 1996 RJ families, we have foun…
Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926
Tripp, Todd M.; Wang, Q. Daniel; Li, Zhiyuan +3 more
We have initiated a program to study the baryon content and dynamic state of galaxy clusters. Here we present results primarily from XMM-Newton observations of two optically selected galaxy clusters, A1095 (z ≃ 0.210) and A1926 (z ≃ 0.136). We find that both of them are actually cluster pairs at similar redshifts. We characterize the temperatures …
An AO-assisted Variability Study of Four Globular Clusters
Contreras Ramos, R.; Catelan, M.; Hakala, P. +4 more
The image-subtraction technique applied to study variable stars in globular clusters represented a leap in the number of new detections, with the drawback that many of these new light curves could not be transformed to magnitudes due to severe crowding. In this paper, we present observations of four Galactic globular clusters, M 2 (NGC 7089), M 10…
The Quest for the Largest Depleted Galaxy Core: Supermassive Black Hole Binaries and Stalled Infalling Satellites
Graham, Alister W.; Bonfini, Paolo
Partially depleted cores are practically ubiquitous in luminous early-type galaxies (M B ≲ -20.5 mag) and are typically smaller than 1 kpc. In one popular scenario, supermassive black hole (SMBH) binaries—established during dry (I.e., gas-poor) galaxy mergers—kick out the stars from a galaxy’s central region via three-body interaction…
The XXL Survey. VII. A supercluster of galaxies at z = 0.43
Altieri, B.; Valtchanov, I.; Smolčić, V. +15 more
Context. The XXL Survey is the largest homogeneous and contiguous survey carried out with XMM-Newton. Covering an area of 50 deg2 distributed over two fields, it primarily investigates the large-scale structures of the Universe using the distribution of galaxy clusters and active galactic nuclei as tracers of the matter distribution.
Saturn's northern auroras as observed using the Hubble Space Telescope
Badman, S. V.; Nichols, J. D.; Clarke, J. T. +4 more
We discuss the features of Saturn's northern FUV auroras as observed during a program of Hubble Space Telescope observations which executed over 2011-2013 and culminated, along with Cassini observations, in a comprehensive multi-spectral observing campaign. Our 2011-2013 observations of the northern aurora are also compared with those from our 200…
Submillimeter array observations of NGC 2264-C: molecular outflows and driving sources
Lumsden, Stuart L.; Cunningham, Nichol; Cyganowski, Claudia J. +2 more
We present 1.3 mm Submillimeter Array (SMA) observations at ∼3 arcsec resolution towards the brightest section of the intermediate/massive star-forming cluster NGC 2264-C. The millimetre continuum emission reveals ten 1.3 mm continuum peaks, of which four are new detections. The observed frequency range includes the known molecular jet/outflow tra…
Mid-infrared imaging- and spectro-polarimetric subarcsecond observations of NGC 1068
Esquej, P.; Telesco, C. M.; Díaz-Santos, T. +10 more
We present subarcsecond 7.5-13 µm imaging- and spectro-polarimetric observations of NGC 1068 using CanariCam on the 10.4-m Gran Telescopio CANARIAS. At all wavelengths, we find: (1) A 90 × 60 pc extended polarized feature in the northern ionization cone, with a uniform ∼44° polarization angle. Its polarization arises from dust and gas emissi…
The Effect of Unresolved Binaries on Globular Cluster Proper-motion Dispersion Profiles
Anderson, J.; Schinnerer, E.; van der Marel, R. P. +5 more
High-precision kinematic studies of globular clusters (GCs) require an accurate knowledge of all possible sources of contamination. Among other sources, binary stars can introduce systematic biases in the kinematics. Using a set of Monte Carlo cluster simulations with different concentrations and binary fractions, we investigate the effect of unre…
Observations of high and low Fe charge states in individual solar wind streams with coronal-hole origin
Berger, Lars; Heidrich-Meisner, Verena; Wimmer-Schweingruber, Robert +2 more
Context. The solar wind originating from coronal holes is comparatively well-understood and is characterized by lower densities and average charge states compared to the so-called slow solar wind. Except for wave perturbations, the average properties of the coronal-hole solar wind are passably constant.
Aims: In this case study, we focus on o…