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45 papers · 1 filter
Fading AGN Candidates: AGN Histories and Outflow Signatures
William C. Keel, Chris J. Lintott, W. Peter Maksym +12
We consider energy budgets and radiative history of 8 fading AGN, identified from mismatch between the ionizion of very extended (>10 kpc) ionized clouds and the luminosity of the…
Internal Gravity Waves in the Magnetized Solar Atmosphere. I. Magnetic Field Effects
G. Vigeesh, J. Jackiewicz, O. Steiner
Observations of the solar atmosphere show that internal gravity waves are generated by overshooting convection, but are suppressed at locations of magnetic flux, which is thought t…
A Distant Mirror: Solar Oscillations Observed on Neptune by the Kepler K2 Mission
P. Gaulme, J. F. Rowe, T. R. Bedding +24
Starting in December 2014, Kepler K2 observed Neptune continuously for 49 days at a 1-minute cadence. The goals consisted of studying its atmospheric dynamics (Simon et al. 2016),…
SDSS-IV MaNGA: environmental dependence of stellar age and metallicity gradients in nearby galaxies
Zheng Zheng, Huiyuan Wang, Junqiang Ge +20
We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA integral field spectra. We derive age and metallicity gr…
Very Thin Disc Galaxies in The SDSS Catalog of Edge-on Galaxies
D. V. Bizyaev, S. J. Kautsch, N. Ya. Sotnikova +2
We study the properties of galaxies with very thin discs using a sample of 85 objects whose stellar disc radial-to-vertical scale ratio determined from photometric decomposition, e…
Epoch of Reionisation 21cm Forecasting From MCMC-Constrained Semi-Numerical Models
Sultan Hassan, Romeel Dave, Kristian Finlator +1
The recent low value of Planck (2016) integrated optical depth to Thomson scattering suggests that the reionization occurred fairly suddenly, disfavoring extended reionization scen…