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Co-spatial Long-slit UV/Optical AL Spectra of 10 Galactic Planetary Nebulae with HST/STIS. I. Description of the Observations, Global Emission-line Measurements, and CNO Abundances
Corradi, Romano L. M.; Balick, Bruce; Shaw, Richard A. +3 more
We present observations and initial analysis from a Hubble Space Telescope (HST) Cycle 19 program using STIS to obtain the first co-spatial, UV-optical spectra of 10 Galactic planetary nebulae (PNs). Our primary objective was to measure the critical emission lines of carbon and nitrogen with unprecedented signal-to-noise ratio (S/N) and spatial re…
Chemical Abundances and Properties of the Ionized Gas in NGC 1705
Tosi, M.; Mignoli, M.; Aloisi, A. +3 more
We obtained [O iii] narrow-band imaging and multi-slit MXU spectroscopy of the blue compact dwarf (BCD) galaxy NGC 1705 with FORS2@VLT to derive chemical abundances of planetary nebulae and H ii regions and, more in general, to characterize the properties of the ionized gas. The auroral [O iii]λ 4363 line was detected in all but 1 of the 11 analyz…
Relativistic electron acceleration during HILDCAA events: are precursor CIR magnetic storms important?
Hajra, Rajkumar; Tsurutani, Bruce T.; Gonzalez, Walter D. +4 more
We present a comparative study of high-intensity long-duration continuous AE activity (HILDCAA) events, both isolated and those occurring in the "recovery phase" of geomagnetic storms induced by corotating interaction regions (CIRs). The aim of this study is to determine the difference, if any, in relativistic electron acceleration and magnetosphe…
Revision of Earth-sized Kepler Planet Candidate Properties with High-resolution Imaging by the Hubble Space Telescope
Wright, Jason T.; Ciardi, David R.; Gilliland, Ronald L. +1 more
We present the results of our Hubble Space Telescope program and describe how our analysis methods were used to re-evaluate the habitability of some of the most interesting Kepler planet candidates. Our program observed 22 Kepler Object of Interest (KOI) host stars, several of which were found to be multiple star systems unresolved by Kepler. We u…
Constraints on the depths of origin of peak rings on the Moon from Moon Mineralogy Mapper data
Head, James W.; Baker, David M. H.
Important to understanding the process of basin formation on planetary bodies are constraints on the mineralogy and depths of origin of interior ring structures. We summarize previous analyses of the mineralogy of basin materials on the Moon and use hyperspectral image-cubes from the Chandrayaan-1's Moon Mineralogy Mapper (M3) to determ…
Sound speed of scalar field dark energy: Weak effects and large uncertainties
Sergijenko, Olga; Novosyadlyj, Bohdan
The possibility of a reconstruction of the Lagrangian for the scalar field dark energy with constant effective sound speed cs is analyzed. It is found that such a reconstruction can be made with accuracy up to an arbitrary constant. The value of cs is estimated together with other dark energy parameters (Ωd e , w
The XMM deep survey in the CDF-S. IX. An X-ray outflow in a luminous obscured quasar at z ≈ 1.6
Bauer, F. E.; Brandt, W. N.; Fiore, F. +13 more
In active galactic nuclei (AGN)-galaxy co-evolution models, AGN winds and outflows are often invoked to explain why super-massive black holes and galaxies stop growing efficiently at a certain phase of their lives. They are commonly referred to as the leading actors of feedback processes. Evidence of ultra-fast (v ≳ 0.05c) outflows in the innermos…
The Formation of Iris Diagnostics. VIII. Iris Observations in the C II 133.5 nm Multiplet.
De Pontieu, Bart; Carlsson, Mats; Rathore, Bhavna +1 more
The C ii 133.5 nm multiplet has been observed by NASA’s Interface Region Imaging Spectrograph (IRIS) in unprecedented spatial resolution. The aims of this work are to characterize these new observations of the C ii lines, place them in context with previous work, and to identify any additional value the C ii lines bring when compared with other sp…
In situ optical measurements of Chang'E-3 landing site in Mare Imbrium: 1. Mineral abundances inferred from spectral reflectance
Xiao, Long; Di, Kaichang; Yuan, Ye +11 more
The visible and near-infrared imaging spectrometer on board the Yutu Rover of Chinese Chang'E-3 mission measured the lunar surface reflectance at a close distance (~1 m) and collected four spectra at four different sites. These in situ lunar spectra have revealed less mature features than that measured remotely by spaceborne sensors such as the Mo…
Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +219 more
The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position {RA=18^h 32^m 50^s ± 3^s_{stat} ± 2^s_{syst}}, {Dec=-9*deg;22'36" ± 32"}_{…