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Triaxial strong-lensing analysis of the z > 0.5 MACS clusters: the mass-concentration relation
Zitrin, Adi; Sereno, Mauro
The high concentrations derived for several strong-lensing clusters present a major inconsistency between theoretical Λ cold dark matter (ΛCDM) expectations and measurements. Triaxiality and orientation biases might be at the origin of this disagreement, as clusters elongated along the line of sight would have a relatively higher projected mass de…
PowellSnakes II: a fast Bayesian approach to discrete object detection in multi-frequency astronomical data sets
Lasenby, A.; Carvalho, Pedro; Rocha, Graça. +1 more
PowellSnakes (PwS) is a Bayesian algorithm for detecting compact objects embedded in a diffuse background, and was selected and successfully employed by the Planck consortium in the production of its first public deliverable: the Early Release Compact Source Catalogue (ERCSC). We present the critical foundations and main directions of further deve…
Near-infrared Variability in Young Stars in Cygnus OB7
Wolk, Scott J.; Aspin, Colin; Rice, Thomas S.
We present the first results from a 124 night J, H, K near-infrared monitoring campaign of the dark cloud L 1003 in Cygnus OB7, an active star-forming region. Using three seasons of UKIRT observations spanning 1.5 years, we obtained high-quality photometry on 9200 stars down to J = 17 mag, with photometric uncertainty better than 0.04 mag. On the …
Sympathetic Filament Eruptions from a Bipolar Helmet Streamer in the Sun
Yang, Bo; Yang, Jiayan; Bi, Yi +3 more
On 2005 August 5, two solar filaments erupted successively from different confined arcades underlying a common overarching multiple-arcade bipolar helmet streamer. We present detailed observations of these two events and identify them as sympathetic filament eruptions. The first (F1) is a small active-region filament located near the outskirts of …
Characterization of hydrated silicate-bearing outcrops in Tyrrhena Terra, Mars: Implications to the alteration history of Mars
Mangold, N.; Bibring, J. -P.; Gondet, B. +7 more
The Tyrrhena Terra region of Mars is studied with the imaging spectrometers OMEGA (Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité) onboard Mars Express and CRISM (Compact Reconnaissance Infrared Spectrometer for Mars) onboard Mars Reconnaissance Orbiter, through the observation of tens of craters that impacted into this part of …
Chandra and XMM-Newton Studies of the Supernova Remnant G292.2-0.5 Associated with the Pulsar J1119-6127
Safi-Harb, Samar; Gonzalez, Marjorie E.; Kumar, Harsha S.
We present the first detailed imaging and spatially resolved spectroscopic study of the Galactic supernova remnant (SNR) G292.2-0.5, associated with the high-magnetic field radio pulsar (PSR) J1119-6127, using Chandra and XMM-Newton. The high-resolution X-ray images reveal a partially limb-brightened morphology in the west, with diffuse emission c…
On the central stellar mass density and the inside-out growth of early-type galaxies
Longhetti, M.; Gargiulo, A.; Saracco, P.
Recent theoretical and observational studies on the assembly of early-type galaxies (ETGs) point towards an inside-out growth of their stellar mass characterized by extended low-mass-density haloes grown around compact and dense cores. Models can form ETGs at high-z as compact spheroids that then grow in size through dry minor mergers. Dry mergers…
Horizontal flow fields observed in Hinode G-band images. II. Flow fields in the final stages of sunspot decay
Liu, C.; Wang, H.; Shimizu, T. +4 more
Context. Generation and dissipation of magnetic fields is a fundamental physical process on the Sun. In comparison to flux emergence and the initial stages of sunspot formation, the demise of sunspots still lacks a comprehensive description.
Aims: The evolution of sunspots is most commonly discussed in terms of their intensity and magnetic fi…
IDCS J1426.5+3508: Cosmological Implications of a Massive, Strong Lensing Cluster at z = 1.75
Dey, Arjun; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +6 more
The galaxy cluster IDCS J1426.5+3508 at z = 1.75 is the most massive galaxy cluster yet discovered at z > 1.4 and the first cluster at this epoch for which the Sunyaev-Zel'Dovich effect has been observed. In this paper, we report on the discovery with Hubble Space Telescope imaging of a giant arc associated with this cluster. The curvature of t…
Scaling laws for magnetic fields on the quiet Sun
Stenflo, J. O.
The Sun's magnetic field is structured over a range of scales that span approximately seven orders of magnitudes, four of which lie beyond the resolving power of current telescopes. Here we have used a Hinode SOT/SP deep mode data set for the quiet-Sun disk center in combination with constraints from the Hanle effect to derive scaling laws that de…