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Interannual and seasonal changes in the north polar ice deposits of Mars: Observations from MY 29-31 using MARCI
James, P. B.; Cantor, B. A.; Calvin, W. M. +1 more
The MARCI camera on the Mars Reconnaissance Orbiter provides daily synoptic coverage that allows monitoring of seasonal cap retreat and interannual changes that occur between Mars year (MY) and over the northern summer. The northern seasonal cap evolution was observed in MY 29, 30 and 31 (12/2007-04/2012). Observation over multiple Mars years allo…
Short-period X-ray oscillations in super-soft novae and persistent super-soft sources
Ness, J. -U.; Henze, M.; Wilms, J. +10 more
Context. Transient short-period (<100 s) oscillations have been found in the X-ray light curves of three novae during their super-soft source (SSS) phase and in one persistent SSS.
Aims: We pursue an observational approach to determine possible driving mechanisms and relations to fundamental system parameters such as the white dwarf mass. …
The Tip of the Red Giant Branch Distances to Type Ia Supernova Host Galaxies. III. NGC 4038/39 and NGC 5584
Lee, Myung Gyoon; Jang, In Sung
We present the tip of the red giant branch (TRGB) distances to Type Ia supernova (SNe Ia) host galaxies NGC 4038/39 and NGC 5584. Based on the deep images constructed using archival Hubble Space Telescope data, we detect red giant branch stars in each galaxy. VI photometry of the resolved stars and corresponding I-band luminosity functions show th…
Constraining Neutrino Cooling Using the Hot White Dwarf Luminosity Function in the Globular Cluster 47 Tucanae
Hansen, Brad M. S.; Heyl, Jeremy; Richer, Harvey +3 more
We present Hubble Space Telescope observations of the upper part ({T}{eff}\gt {10}4 K) of the white dwarf cooling sequence in the globular cluster 47 Tucanae and measure a luminosity function of hot white dwarfs. Comparison with previous determinations from large-scale field surveys indicates that the previously determined pl…
The Properties of Solar Energetic Particle Event-Associated Coronal Mass Ejections Reported in Different CME Catalogs
Cane, H. V.; Richardson, I. G.; von Rosenvinge, T. T.
We compare estimates of the speed and width of coronal mass ejections (CMEs) in several catalogs for the CMEs associated with ∼ 200 solar energetic particle (SEP) events in 2006 - 2013 that included 25 MeV protons. The catalogs used are: CDAW, CACTUS, SEEDS, and CORIMP, all derived from observations by the LASCO coronagraphs on the SOHO spacecraft…
Insights into gas heating and cooling in the disc of NGC 891 from Herschel far-infrared spectroscopy⋆⋆⋆
Fritz, J.; Cooray, A.; Lebouteiller, V. +15 more
We present Herschel PACS and SPIRE spectroscopy of the most important far-infrared cooling lines in the nearby, edge-on spiral galaxy, NGC 891: [Cii] 158 µm, [Nii] 122, 205 µm, [Oi] 63, 145 µm, and [Oiii] 88 µm. We find that the photoelectric heating efficiency of the gas, traced via the ([Cii]+[Oi]63)/FTIR ratio…
GTC OSIRIS transiting exoplanet atmospheric survey: detection of potassium in HAT-P-1b from narrow-band spectrophotometry
Pont, F.; Fortney, J. J.; Lecavelier des Etangs, A. +7 more
We present the detection of potassium in the atmosphere of HAT-P-1b using optical transit narrow-band photometry. The results are obtained using the 10.4-m Gran Telescopio Canarias together with the OSIRIS instrument in tunable filter imaging mode. We observed four transits, two at continuum wavelengths outside the potassium feature, at 6792 and 8…
Integral Field Spectroscopy of AGN Absorption Outflows: Mrk 509 and IRAS F04250-5718
Rupke, David S. N.; Arav, Nahum; Liu, Guilin
Ultraviolet (UV) absorption lines provide abundant spectroscopic information enabling the probe of the physical conditions in active galactic nucleus (AGN) outflows, but the outflow radii (and the energetics consequently) can only be determined indirectly. We present the first direct test of these determinations using integral field unit (IFU) spe…
3C 273 with NuSTAR: Unveiling the Active Galactic Nucleus
Hailey, Charles J.; Fabian, Andrew C.; Brenneman, Laura W. +17 more
We present results from a 244 ks NuSTAR observation of 3C 273 obtained during a cross-calibration campaign with the Chandra, INTEGRAL, Suzaku, Swift, and XMM-Newton observatories. We show that the spectrum, when fit with a power-law model using data from all observatories except INTEGRAL over the 1-78 keV band, leaves significant residuals in the …
Quantifying the Difference Between the Flux-Tube Expansion Factor at the Source Surface and at the Alfvén Surface Using a Global MHD Model for the Solar Wind
Cohen, O.
The potential-field approximation has been providing a fast and computationally inexpensive estimation for the solar corona's global magnetic-field geometry for several decades. In contrast, more physics-based global magnetohydrodynamic (MHD) models have been used for a similar purpose, while being much more computationally expensive. Here, we inv…