Search Publications
Tangential Velocity of the Dark Matter in the Bullet Cluster from Precise Lensed Image Redshifts
Broadhurst, Tom; Zitrin, Adi; Umetsu, Keiichi +3 more
We show that the fast-moving component of the "Bullet Cluster" (1E0657-56) can induce potentially resolvable redshift differences between multiply lensed images of background galaxies. This moving cluster effect, due to the tangential peculiar velocity of the lens, can be expressed as the scalar product of the lensing deflection angle with the tan…
The X-Ray-Optical Relations for Nine Clusters at z = 0.7-1.1 from the ORELSE Survey
Fassnacht, C. D.; Kocevski, D. D.; Lemaux, B. C. +4 more
We use Chandra observations of nine optically and X-ray-selected clusters in five different structures at z ~ 0.7-1.1 from the Observations of Redshift Evolution in Large-Scale Environments survey to study diffuse X-ray emission from galaxy clusters. X-ray gas temperatures and bolometric rest-frame luminosities are measured for each cluster in the…
Characterizing shock waves in molecular outflow sources: the interpretation of Herschel and Spitzer observations of NGC 1333 IRAS 4B
Pineau des Forêts, G.; Flower, D. R.
We have computed C- and J-type models of shock waves in molecular outflow sources. In addition to the (optically thin) emission line spectrum of molecular hydrogen, the spectra of CO, OH, SiO, H2O and NH3 were computed by means of the large velocity gradient approximation. We find that the intensities of the OH lines are part…
The XMM deep survey in the CDF-S. VI. Obscured AGN selected as infrared power-law galaxies
Vignali, C.; Ranalli, P.; Comastri, A. +7 more
Context. Accretion onto supermassive black holes is believed to occur mostly in obscured active galactic nuclei (AGN). Such objects are proving rather elusive in surveys of distant galaxies, including those at X-ray energies.
Aims: Our main goal is to determine whether the revised IRAC criteria of Donley et al. (2012, ApJ, 748, 142; objects w…
The effect of advection at luminosities close to Eddington: The ULX in M 31
Done, C.; Middleton, M.; Straub, O.
The transient, ultra-luminous X-ray source CXOM31 J004253.1+411422 in the Andromeda galaxy is most likely a 10 solar mass black hole, with super-Eddington luminosity at its peak. The XMM-Newton spectra taken during the decline then trace luminosities of 0.86-0.27 LEdd. These spectra are all dominated by a hot disc component, which rough…
Toroidal and poloidal magnetic fields at Venus. Venus Express observations
Fedorov, A.; Barabash, S.; Lundin, R. +5 more
Magnetic field and plasma measurements carried out onboard Venus Express during solar minimum conditions suggest the existence of two kinds of magnetic field configuration in the Venusian ionosphere. We interpret these as the manifestation of two different types of generation mechanisms for the induced magnetosphere. A different magnetic field top…
Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769
Auvergne, M.; Baudin, F.; Poretti, E. +16 more
Aims: We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD 46769 (V = 5.79). We also attempt to detect a magnetic field in the target.
Methods: We analyse a 23-day oversampled CoRoT light curve after detrending and spectroscopic follow-up data using standard Fourier anal…
Comparison of Cone Model Parameters for Halo Coronal Mass Ejections
Moon, Y. -J.; Lee, Kyoung-Sun; Jang, Soojeong +2 more
Halo coronal mass ejections (HCMEs) are a major cause of geomagnetic storms, hence their three-dimensional structures are important for space weather. We compare three cone models: an elliptical-cone model, an ice-cream-cone model, and an asymmetric-cone model. These models allow us to determine three-dimensional parameters of HCMEs such as radial…
Alignment of the angular momentum vectors of planetary nebulae in the Galactic Bulge
Zijlstra, A. A.; Rees, B.
We use high-resolution Hα images of 130 planetary nebulae (PNe) to investigate whether there is a preferred orientation for PNe within the Galactic Bulge. The orientations of the full sample have a uniform distribution. However, at a significance level of 0.01, there is evidence for a non-uniform distribution for those PNe with evident bipolar mor…
In-flight calibration of the Cluster/CODIF sensor
Kistler, L. M.; Mouikis, C. G.; Genestreti, K. J.
The Cluster/CODIF sensor is a time-of-flight instrument that measures the ion composition over the energy range 40 eV e-1 to 40 keV e-1. It operated for 4 yr on S/C 1, 9 yr on S/C 3, and is still operational on S/C 4, after more than 12 yr. During this time the total ion detection efficiency has decreased by a factor of 50. I…