Search Publications
The SAURON project - XIX. Optical and near-infrared scaling relations of nearby elliptical, lenticular and Sa galaxies
Peletier, R. F.; Kuntschner, H.; de Zeeuw, P. T. +16 more
We present ground-based MDM Observatory V-band and Spitzer/InfraRed Array Camera 3.6-?m-band photometric observations of the 72 representative galaxies of the SAURON survey. Galaxies in our sample probe the elliptical E, lenticular S0 and spiral Sa populations in the nearby Universe, both in field and cluster environments. We perform aperture phot…
Exploring the properties of the M31 halo globular cluster system
Mackey, A. D.; Chapman, S. C.; Tanvir, N. R. +6 more
Following on from our discovery of a significant population of M31 outer halo globular clusters (GCs), and updates to the Revised Bologna Catalogue of M31 GCs, we investigate the GC system of M31 out to an unprecedented radius (≈120 kpc). We derive various ensemble properties, including the magnitude, colour and metallicity distributions, as well …
Asteroid 21 Lutetia: Low Mass, High Density
Pätzold, M.; Lamy, P.; Sierks, H. +9 more
Asteroid 21 Lutetia was approached by the Rosetta spacecraft on 10 July 2010. The additional Doppler shift of the spacecraft radio signals imposed by 21 Lutetia’s gravitational perturbation on the flyby trajectory were used to determine the mass of the asteroid. Calibrating and correcting for all Doppler contributions not associated with Lutetia, …
Star-forming galaxies at z≈ 8-9 from Hubble Space Telescope/WFC3: implications for reionization
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +3 more
We present a search for galaxies at 7.6 < z < 9.8 using the latest Hubble Space Telescope/Wide Field Camera 3 (WFC3) near-infrared data, based on the Lyman-break technique. We search for galaxies which have large (Y-J) colours (the 'Y-drops') on account of the Lyman α forest absorption, and with (J-H) colours inconsistent with being low-reds…
Solar X-ray Jets, Type-II Spicules, Granule-size Emerging Bipoles, and the Genesis of the Heliosphere
Cirtain, Jonathan W.; Moore, Ronald L.; Sterling, Alphonse C. +1 more
From Hinode observations of solar X-ray jets, Type-II spicules, and granule-size emerging bipolar magnetic fields in quiet regions and coronal holes, we advocate a scenario for powering coronal heating and the solar wind. In this scenario, Type-II spicules and Alfvén waves are generated by the granule-size emerging bipoles (EBs) in the manner of t…
A Study of Cepheids in M81 with the Large Binocular Telescope (Efficiently Calibrated with Hubble Space Telescope)
Kochanek, C. S.; Stanek, K. Z.; Prieto, J. L. +2 more
We identify and phase a sample of 107 Cepheids with 10 days < P < 100 days in M81 using the Large Binocular Telescope and calibrate their B, V, and I mean magnitudes with archival Hubble Space Telescope (HST) data. The use of a ground-based telescope to identify and phase the Cepheids and HST only for the final calibration reduces the demand…
Adaptive Optics Imaging of Quasi-stellar Objects with Double-peaked Narrow Lines: Are They Dual Active Galactic Nuclei?
Shields, G. A.; Rosario, D. J.; McGurk, R. C. +3 more
Active galaxies hosting two accreting and merging supermassive black holes (SMBHs)—dual active galactic nuclei (AGNs)—are predicted by many current and popular models of black-hole-galaxy co-evolution. We present here the results of a program that has identified a set of probable dual AGN candidates based on near-infrared laser guide star adaptive…
Electron Acceleration Associated with Solar Jets
Krucker, Säm; Lin, R. P.; Kontar, E. P. +2 more
This paper investigates the solar source region of supra-thermal (few keV up to the MeV range) electron beams observed near Earth by combining in situ measurements of the three-dimensional Plasma and Energetic Particles experiment on the WIND spacecraft with remote-sensing hard X-ray observations by the Reuven Ramaty High Energy Solar Spectroscopi…
Modeling the Dispersal of an Active Region: Quantifying Energy Input into the Corona
Green, L. M.; Mackay, Duncan H.; van Ballegooijen, Aad
In this paper, a new technique for modeling nonlinear force-free fields directly from line-of-sight magnetogram observations is presented. The technique uses sequences of magnetograms directly as lower boundary conditions to drive the evolution of coronal magnetic fields between successive force-free equilibria over long periods of time. It is ill…
Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey
Motch, C.; Carrera, F.; Pineau, F. -X. +5 more
The Survey Science Centre of the XMM-Newton satellite released the first incremental version of the 2XMM catalogue in August 2008. Containing more than 220 000 X-ray sources, the 2XMMi was at that time the largest catalogue of X-ray sources ever published and thus constitutes an unprecedented resource for studying the high-energy properties of var…