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Detection of satellite remnants in the Galactic halo with Gaia- III. Detection limits for ultrafaint dwarf galaxies
Figueras, F.; Brown, A. G. A.; Antoja, T. +8 more
We present a method to identify ultrafaint dwarf galaxies (UFDGs) candidates in the halo of the Milky Way using the future Gaia catalogue and we explore its detection limits and completeness. The method is based on the Wavelet Transform and searches for overdensities in the combined space of sky coordinates and proper motions, using kinematics in …
The Grism Lens-Amplified Survey from Space (GLASS). V. Extent and Spatial Distribution of Star Formation in z ~ 0.5 Cluster Galaxies
Fontana, Adriano; Pentericci, Laura; Schmidt, Kasper B. +14 more
We present the first study of the spatial distribution of star formation in z ∼ 0.5 cluster galaxies. The analysis is based on data taken with the Wide Field Camera 3 as part of the Grism Lens-Amplified Survey from Space (GLASS). We illustrate the methodology by focusing on two clusters (MACS 0717.5+3745 and MACS 1423.8+2404) with different morpho…
Groove formation on Phobos: Testing the Stickney ejecta emplacement model for a subset of the groove population
Head, James W.; Wilson, Lionel
Numerous theories have been proposed for the formation of grooves on Phobos, and no single explanation is likely to account fully for the wide variety of observed groove morphologies and orientations. One set of grooves is geographically associated with the impact crater Stickney. We test the hypothesis that these grooves were formed by clasts tha…
Spatially resolved HST/STIS observations of Io's dayside equatorial atmosphere
Spencer, John R.; Jessup, Kandis Lea
We report on an investigation of the spatial distribution of Io's atmosphere, and its diurnal variability, using Hubble's Space Telescope Imaging Spectrograph (HST/STIS). From December 2010 to January 2012, we obtained spatially resolved limb-to-limb 2100-3100 Å spectra at low latitudes (<30°), with the STIS 0.1″ slit. Spectra taken at two cent…
Physical Conditions in the X-Ray Emission-line Gas in NGC 1068
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. Michael +2 more
We present a detailed, photoionization modeling analysis of XMM-Newton/Reflection Grating Spectrometer observations of the Seyfert 2 galaxy NGC 1068. The spectrum, previously analyzed by Kinkhabwala et al., reveals a myriad of soft X-ray emission lines, including those from H- and He-like carbon, nitrogen, oxygen, and neon, and M- and L-shell iron…
Alfvénic waves in polar spicules
Koutchmy, S.; Ahangarzadeh Maralani, A. R.; Tavabi, E. +2 more
Context. For investigating spicules from the photosphere to coronal heights, the new Hinode/SOT long series of high-resolution observations from space taken in CaII H line emission offers an improved way to look at their remarkable dynamical behavior using images free of seeing effects. They should be put in the context of the huge amount of alrea…
Temperature and Electron Density Diagnostics of a Candle-flame-shaped Flare
Longcope, D. W.; McKenzie, D. E.; Plowman, J. E. +2 more
Candle-flame-shaped flares are archetypical structures that provide indirect evidence of magnetic reconnection. A flare resembling Tsuneta's famous 1992 candle-flame flare occurred on 2011 January 28; we present its temperature and electron density diagnostics. This flare was observed with Solar Dynamics Observatory/Atmospheric Imaging Assembly (S…
Infrared study of transitional disks in Ophiuchus with Herschel
André, Philippe; Ábrahám, Péter; Bouy, Hervé +7 more
Context. Observations of nearby star-forming regions with the Herschel Space Observatory complement our view of the protoplanetary disks in Ophiuchus with information about the outer disks.
Aims: The main goal of this project is to provide new far-infrared fluxes for the known disks in the core region of Ophiuchus and to identify potential tr…
Energy dependence of the band-limited noise in black hole X-ray binaries★
Stiele, H.; Yu, W.
Black hole low-mass X-ray binaries show a variety of variability features, which manifest as narrow peak-like structures superposed on broad noise components in power density spectra in the hard X-ray emission. In this work, we study variability properties of the band-limited noise component during the low-hard state for a sample of black hole X-r…
Cassini ISS astrometry of the Saturnian satellites: Tethys, Dione, Rhea, Iapetus, and Phoebe 2004-2012
Cooper, N. J.; Lainey, V.; Murray, C. D. +1 more
Context. The Cassini spacecraft has been orbiting Saturn since 2004 and has returned images of satellites with an astrometric resolution as high as a few hundred meters per pixel.
Aims: We used the images taken by the Narrow Angle Camera (NAC) of the Image Science Subsystem (ISS) instrument on board Cassini, for the purpose of astrometry.