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The treatment of mixing in core helium burning models - II. Constraints from cluster star counts
Campbell, Simon W.; Constantino, Thomas; Lattanzio, John C. +1 more
The treatment of convective boundaries during core helium burning is a fundamental problem in stellar evolution calculations. In the first paper of this series, we showed that new asteroseismic observations of these stars imply they have either very large convective cores or semiconvection/partially mixed zones that trap g modes. We probe this mix…
Shapley Supercluster Survey: ram-pressure stripping versus tidal interactions in the Shapley supercluster
Bourdin, H.; Mazzotta, P.; Haines, C. P. +4 more
We present two new examples of galaxies undergoing transformation in the Shapley supercluster core. These low-mass (M_{star }∼ 0.4-1× 10^{10} M⊙) galaxies are members of the two clusters SC 1329-313 (z ∼ 0.045) and SC 1327-312 (z ∼ 0.049). Integral-field spectroscopy complemented by imaging in the ugriK bands and in Hα narrow band is us…
Star Formation Suppression Due to Jet Feedback in Radio Galaxies with Shocked Warm Molecular Gas
Alatalo, Katherine; Lanz, Lauranne; Ogle, Patrick M. +1 more
We present Herschel observations of 22 radio galaxies, selected for the presence of shocked, warm molecular hydrogen emission. We measured and modeled spectral energy distributions in 33 bands from the ultraviolet to the far-infrared to investigate the impact of jet feedback on star formation activity. These galaxies are massive, early-type galaxi…
Variations of water vapor and cloud top altitude in the Venus' mesosphere from SPICAV/VEx observations
Montmessin, F.; Fedorova, A.; Korablev, O. +3 more
SPICAV VIS-IR spectrometer on-board the Venus Express mission measured the H2O abundance above Venus' clouds in the 1.38 µm band, and provided an estimation of the cloud top altitude based on CO2 bands in the range of 1.4-1.6 µm. The H2O content and the cloud top altitude have been retrieved for the com…
Chromophores from photolyzed ammonia reacting with acetylene: Application to Jupiter's Great Red Spot
Baines, K. H.; Carlson, R. W.; Simon, A. A. +2 more
The high altitude of Jupiter's Great Red Spot (GRS) may enhance the upward flux of gaseous ammonia (NH3) into the high troposphere, where NH3 molecules can be photodissociated and initiate a chain of chemical reactions with downwelling acetylene molecules (C2H2). These reactions, experimentally studied e…
Warm absorbers in X-rays (WAX), a comprehensive high-resolution grating spectral study of a sample of Seyfert Galaxies - II. Warm absorber dynamics and feedback to galaxies
Dewangan, Gulab C.; Guainazzi, Matteo; Laha, Sibasish +2 more
This paper is a sequel to the extensive study of warm absorber (WA) in X-rays carried out using high-resolution grating spectral data from XMM-Newton satellite (WAX-I). Here we discuss the global dynamical properties as well as the energetics of the WA components detected in the WAX sample. The slope of WA density profile (n ∝ r-α) esti…
A free-form mass model of the Hubble Frontier Fields cluster AS1063 (RXC J2248.7-4431) with over one hundred constraints
Broadhurst, Tom; Zheng, Wei; Lam, Daniel +5 more
We derive a free-form mass distribution for the massive cluster AS1063 (z = 0.348) using the completed optical imaging from the Hubble Frontier Fields programmme. Based on a subset of 11 multiply lensed systems with spectroscopic redshift, we produce a lens model that is accurate enough to secure new multiply lensed systems, totalling over a 100 a…
The Complete Ultraviolet Spectrum of the Archetypal "Wind-dominated" Quasar Mrk 231: Absorption and Emission from a High-speed Dusty Nuclear Outflow
Veilleux, S.; Rupke, D. S. N.; Hamann, F. +2 more
New near- and far-ultraviolet (NUV and FUV) Hubble Space Telescope spectra of Mrk 231, the nearest quasar known, are combined with ground-based optical spectra to study the remarkable dichotomy between the FUV and NUV-optical spectral regions in this object. The FUV emission-line features are faint, broad, and highly blueshifted (up to ∼7000 km s<…
Observation of a Quasiperiodic Pulsation in Hard X-Ray, Radio, and Extreme-ultraviolet Wavelengths
Kumar, Pankaj; Cho, Kyung-Suk; Nakariakov, Valery M.
We present a multiwavelength analysis of a quasiperiodic pulsation (QPP) observed in the hard X-ray (HXR), radio, and extreme-ultraviolet (EUV) channels during an M1.9 flare that occurred on 2011 September 23-24. The nonthermal HXR emission in 25-50 keV observed by RHESSI shows five distinct impulsive peaks of decaying amplitude with a period of a…
Nature, distribution, and origin of Titan's Undifferentiated Plains
Janssen, M. A.; Cassini RADAR Team; Lopes, Rosaly M. C. +15 more
The Undifferentiated Plains on Titan, first mapped by Lopes et al. (Lopes, R.M.C. et al., 2010. Icarus, 205, 540-588), are vast expanses of terrains that appear radar-dark and fairly uniform in Cassini Synthetic Aperture Radar (SAR) images. As a result, these terrains are often referred to as ;blandlands;. While the interpretation of several other…