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Compositional Similarities and Distinctions between Titan’s Evaporitic Terrains
Barnes, Jason W.; MacKenzie, S. M.
We document the similarities in composition between the equatorial basins Tui Regio, Hotei Regio, and other 5-µm-bright materials, notably the north polar evaporites, by investigating the presence and extent of an absorption feature at 4.92 µm. In most observations, Woytchugga Lacuna, Ontario Lacus, MacKay Lacus, deposits near Fensal, …
Tracing the Chromospheric and Coronal Magnetic Field with AIA, IRIS, IBIS, and ROSA Data
Aschwanden, Markus J.; Reardon, Kevin; Jess, Dave B.
The aim of this study is to explore the suitability of chromospheric images for magnetic modeling of active regions. We use high-resolution images (≈ 0\buildrel{\prime\prime}\over{.} 2{--}0\buildrel{\prime\prime}\over{.} 3), from the Interferometric Bidimensional Spectrometer in the Ca II 8542 Å line, the Rapid Oscillations in the Solar Atmosphere…
A Study of the Relation between Star Formation and Molecular Clumps on Subparsec Scales in 30 Doradus
Panagia, N.; Indebetouw, R.; Sabbi, E. +4 more
We present 12CO and 13CO molecular gas data observed by ALMA, massive early-stage young stellar objects (YSOs) identified by applying color-magnitude cuts to Spitzer and Herschel photometry, and low-mass late-stage YSOs identified via {{H}}α excess. Using dendrograms, we derive properties for the molecular cloud structures. T…
Physical properties of CO-dark molecular gas traced by C+
Wang, Shen; Heiles, Carl; Li, Di +3 more
Context. Neither Hi nor CO emission can reveal a significant quantity of so-called dark gas in the interstellar medium (ISM). It is considered that CO-dark molecular gas (DMG), the molecular gas with no or weak CO emission, dominates dark gas. Determination of physical properties of DMG is critical for understanding ISM evolution. Previous studies…
The Rotation of the Solar Photospheric Magnetic Field
Xu, J. C.; Gao, P. X.
The rotational characteristics of the solar photospheric magnetic field at four flux ranges are investigated together with the total flux of active regions (MFar) and quiet regions (MFqr). The first four ranges (MF1-4) are (1.5-2.9) × 1018, (2.9-32.0) × 1018, (3.20-4.27) × 1019, and…
A Deep X-Ray View of the Bare AGN Ark 120. I. Revealing the Soft X-Ray Line Emission
Turner, T. J.; Porquet, D.; Reeves, J. N. +3 more
The Seyfert 1 galaxy Ark 120 is a prototype example of the so-called class of bare nucleus active galactic nuclei (AGNs), whereby there is no known evidence for the presence of ionized gas along the direct line of sight. Here deep (>400 ks exposure), high-resolution X-ray spectroscopy of Ark 120 is presented from XMM-Newton observations that we…
A Deep X-Ray View of the Bare AGN Ark 120. II. Evidence for Fe K Emission Transients
Porquet, D.; Matt, G.; Reeves, J. N. +3 more
We report on the results from a large observational campaign on the bare Seyfert galaxy Ark 120, jointly carried out in 2014 with XMM-Newton, Chandra, and NuSTAR. The fortunate line of sight to this source, devoid of any significant absorbing material, provides an incomparably clean view to the nuclear regions of an active galaxy. Here we focus on…
Modeling the Initiation of the 2006 December 13 Coronal Mass Ejection in AR 10930: The Structure and Dynamics of the Erupting Flux Rope
Fan, Yuhong
We carry out a 3D magnetohydrodynamic simulation to model the initiation of the coronal mass ejection (CME) on 2006 December 13 in the emerging δ-sunspot active region NOAA 10930. The setup of the simulation is similar to a previous simulation by Fan, but with a significantly widened simulation domain to accommodate the wide CME. The simulation sh…
A low-luminosity soft state in the short-period black hole X-ray binary Swift J1753.5-0127
Altamirano, D.; Charles, P. A.; Gandhi, P. +6 more
We present results from the spectral fitting of the candidate black hole X-ray binary Swift J1753.5-0127 in an accretion state previously unseen in this source. We fit the 0.7-78 keV spectrum with a number of models, however the preferred model is one of a multitemperature disc with an inner disc temperature kTin = 0.252 ± 0.003 keV sca…
Saturn's icy satellites investigated by Cassini-VIMS. IV. Daytime temperature maps
Sotin, Christophe; Buratti, Bonnie J.; Clark, Roger N. +13 more
The spectral position of the 3.6 µm continuum peak measured on Cassini-VIMS I/F spectra is used as a marker to infer the temperature of the regolith particles covering the surfaces of Saturn's icy satellites. This feature is characterizing the crystalline water ice spectrum which is the dominant compositional endmember of the satellites' sur…