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Effects on magnetic reconnection of a density asymmetry across the current sheet
André, M.; Khotyaintsev, Y.; Vaivads, A. +8 more
The Once and Future Andromeda Stream
Rich, R. Michael; Mori, Masao
We study the interaction between an accreting satellite and the Andromeda galaxy (M31) analytically and numerically, using a high-resolution N-body simulation with 4 × 107 particles. For the first time, we show the self-gravitating response of the disk, the bulge, and the dark matter halo of M31 to an accreting satellite. We reproduce t…
The impact of Spitzer infrared data on stellar mass estimates - and a revised galaxy stellar mass function at 0 < z < 5
Elsner, F.; Hopp, U.; Feulner, G.
Aims:We estimate stellar masses of galaxies in the high redshift universe with the intention of determining the influence of newly available Spitzer/IRAC infrared data on the analysis. Based on the results, we probe the mass assembly history of the universe.
Methods: We use the GOODS-MUSIC catalog, which provides multiband photometry from the …
Detection of sea-serpent field lines in sunspot penumbrae
Bellot Rubio, L. R.; Sainz Dalda, A.
Aims:We investigate the spatial distribution of magnetic polarities in the penumbra of a spot observed very close to disk center.
Methods: High angular and temporal resolution magnetograms taken with the Narrowband Filter Imager aboard Hinode are used in this study. They provide continuous and stable measurements in the photospheric Fe I 630.2…
Diffuse UV light associated with the Spiderweb Galaxy: evidence for in situ star formation outside galaxies
Röttgering, H. J. A.; Miley, G. K.; Overzier, R. A. +2 more
We present detailed images of diffuse ultraviolet (UV) intergalactic light (IGL), situated in a 60-kpc halo that surrounds the radio galaxy MRC1138-262 at z = 2. We discuss the nature of the IGL and rule out faint cluster galaxies, nebular continuum emission, synchrotron, inverse Compton, synchrotron self-Compton emission and scattering of galacti…
Three-Dimensional Reconstruction of Two Solar Coronal Mass Ejections Using the STEREO Spacecraft
Howard, Timothy A.; Tappin, S. James
Previous attempts to produce three-dimensional (3-D) reconstructions of coronal mass ejections (CMEs) have required either modeling efforts or comparisons with secondary associated eruptions near the solar surface. This is because coronagraphs are only able to produce sky-plane-projected images of CMEs and it has hence been impossible to overcome …
The Dependence of Ephemeral Region Emergence on Local Flux Imbalance
DeRosa, Marc L.; Schrijver, Carolus J.; Hagenaar, Hermance J.
We investigate the distribution and evolution of existing and emerging magnetic network elements in the quiet-Sun photosphere. The ephemeral region emergence rate is found to depend primarily on the imbalance of magnetic flux in the area surrounding its emergence location, such that the rate of flux emergence is lower within strongly unipolar regi…
Gravitational lenses and lens candidates identified from the COSMOS field
Jackson, Neal
A complete manual search has been carried out of the list of 285423 objects, nearly all of them galaxies, identified in the Cosmic Evolution Survey (COSMOS) field that are brighter than I = 25. Two certain and one highly probable new gravitational lenses are found, in addition to the lenses and candidate lens systems previously found by Faure et a…
Absolute Photometric Calibration of the Infrared Camera (IRC) aboard AKARI
Oyabu, Shinki; Ohyama, Youichi; Onaka, Takashi +11 more
The absolute photometric calibration of imaging observations with the Infrared Camera (IRC) aboard the AKARI satellite was performed by monitoring the same stars regularly and by observing aset of standard stars. By our monitoring observations, we confirmed that all channels of the IRC were stable to within 4% and that their sensitivities were con…
Deep Advanced Camera for Surveys Imaging in the Globular Cluster NGC 6397: the Binary Fraction
Anderson, J.; Stetson, P. B.; Rich, R. M. +5 more
Using Hubble Space Telescope observations of the globular cluster NGC 6397, we constrain the cluster's binary fraction. The observations consist of two fields: the primary science field, a single Advanced Camera for Surveys (ACS) pointing centered approximately 5' from the cluster center; and the parallel field, a single WFPC2 field centered on th…