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Implications of MAVEN's planetographic coordinate system for comparisons to other recent Mars orbital missions
Withers, Paul; Jakosky, B. M.
The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission uses a planetographic coordinate system to report altitude, latitude, and longitude on Mars. By contrast, Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter generally used a planetocentric coordinate system. These two coordinate systems are different: latitud…
New Binaries in the ɛ Cha Association
Tokovinin, Andrei; Briceño, César
We present Adaptive Optics-aided speckle observations of 47 young stars in the ɛ Cha association made at the 4 m Southern Astrophysical Research Telescope in the I-band. We resolved 10 new binary pairs, 5 previously known binaries, and 2 triple systems, also previously known. In the separation range between 4 and 300 au, the 30 association members…
Far-infrared emission in luminous quasars accompanied by nuclear outflows
Hewett, P. C.; Dunne, L.; Dye, S. +9 more
Combining large-area optical quasar surveys with the new far-infrared (FIR) Herschel-ATLAS Data Release 1, we search for an observational signature associated with the minority of quasars possessing bright FIR luminosities. We find that FIR-bright quasars show broad C IV emission-line blueshifts in excess of that expected from the optical luminosi…
Coronal properties of the luminous radio-quiet quasar QSO B2202-209
Harrison, F. A.; Stern, D.; Behar, E. +8 more
We present an analysis of the joint XMM-Newton and NuSTAR observations of the radio-quiet quasar QSO B2202-209. Using an optical observation from the Hale Telescope at the Palomar Observatory, we revise the redshift of the source from the previously reported z = 1.77 to z = 0.532, and we estimate the mass of the central black hole, log (MBH
Probing gravitational non-minimal coupling with dark energy surveys
Geng, Chao-Qiang; Lee, Chung-Chi; Wu, Yi-Peng
We investigate observational constraints on a specific one-parameter extension to the minimal quintessence model, where the quintessence field acquires a quadratic coupling to the scalar curvature through a coupling constant
“Dandelion” Filament Eruption and Coronal Waves Associated with a Solar Flare on 2011 February 16
Shibata, Kazunari; Takasao, Shinsuke; Ishii, Takako T. +11 more
Coronal disturbances associated with solar flares, such as Hα Moreton waves, X-ray waves, and extreme ultraviolet (EUV) coronal waves, are discussed herein in relation to magnetohydrodynamic fast-mode waves or shocks in the corona. To understand the mechanism of coronal disturbances, full-disk solar observations with high spatial and temporal reso…
XMM-Newton X-Ray Observations of LkCa 15: A T Tauri Star with a Formative Planetary System
Skinner, Stephen L.; Güdel, Manuel
High-resolution ground-based images of the T Tauri star LkCa 15 have revealed multiple companions that are thought to comprise a formative planetary system. The candidate protoplanets orbit at distances of ∼15-20 au within the dust-depleted inner region of the circumstellar disk. Because of its young age (∼1-4 Myr), LkCa 15 provides a benchmark sy…
Source clustering in the Hi-GAL survey determined using a minimum spanning tree method
Elia, D.; Pezzuto, S.; Schisano, E. +5 more
Aims: The aims are to investigate the clustering of the far-infrared sources from the Herschel infrared Galactic Plane Survey (Hi-GAL) in the Galactic longitude range of -71 to 67 deg. These clumps, and their spatial distribution, are an imprint of the original conditions within a molecular cloud. This will produce a catalogue of over-densiti…
Temperatures and CH4 mixing ratios near the homopause of the 8 µm north polar hot spot of Jupiter
Orton, G. S.; Kim, Sang Joon; Yung, Yuk L. +4 more
We have derived homopause temperatures of 180-250 K for the 8-µm north-polar hot spot (8NPHS) of Jupiter by fitting CH4 emission models to 3 and 8 µm spectra of the 8NPHS obtained 24 days apart in 2013. From the fits, we find that CH4 mixing ratios at the 8NPHS are consistent with those reported by Kim et al. (201…
A counterimage to the gravitational arc in Abell 1201: Evidence for IMF variations, or a 1010 M⊙ black hole?★†
Edge, Alastair C.; Lucey, John R.; Smith, Russell J.
Abell 1201 is a massive galaxy cluster at z = 0.169 with a brightest cluster galaxy (BCG) that acts as a gravitational lens to a background source at z = 0.451. The lensing configuration is unusual, with a single bright arc formed at small radius (∼2 arcsec), where stars and dark matter are both expected to contribute substantially to the total le…