Search Publications
The Molecular H2 Emission and the Stellar Kinematics in the Nuclear Region of the Sombrero Galaxy
Steiner, J. E.; Menezes, R. B.
We analyze the molecular H2 emission and the stellar kinematics in a data cube of the nuclear region of M104, the Sombrero galaxy, obtained with NIFS on the Gemini-north telescope. After a careful subtraction of the stellar continuum, the only emission line we detected in the data cube was {{{H}}}2λ 21218. An analysis of this…
Solar Micro-Type III Burst Storms and Long Dipolar Magnetic Field in the Outer Corona
Misawa, H.; Kasaba, Y.; Miyoshi, Y. +4 more
Solar micro-type III radio bursts are elements of the so-called type III storms and are characterized by short-lived, continuous, and weak emissions. Their frequency of occurrence with respect to radiation power is quite different from that of ordinary type III bursts, suggesting that the generation process is not flare-related, but due to some re…
Observations and Numerical Modeling of the Jovian Ribbon
Sayanagi, K. M.; Simon, A.; Cosentino, R. G. +1 more
Multiple wavelength observations made by the Hubble Space Telescope in early 2007 show the presence of a wavy, high-contrast feature in Jupiter’s atmosphere near 30°N. The “Jovian Ribbon,” best seen at 410 nm, irregularly undulates in latitude and is time-variable in appearance. A meridional intensity gradient algorithm was applied to the observat…
Hα and EUV Observations of a Partial CME
Antolin, Patrick; Christian, Damian J.; Jess, David B. +1 more
We have obtained Hα high spatial and time resolution observations of the upper solar chromosphere and supplemented these with multi-wavelength observations from the Solar Dynamics Observatory (SDO) and the Hinode Extreme-ultraviolet Imaging Spectrometer. The Hα observations were conducted on 2012 February 11 with the Hydrogen-Alpha Rapid Dynamics …
Cycle Length Dependence of Stellar Magnetic Activity and Solar Cycle 23
Lee, Jeongwoo; Choi, Hwajin; Oh, Suyeon +3 more
Solar cycle (SC) 23 was extraordinarily long with remarkably low magnetic activity. We have investigated whether this is a common behavior of solar-type stars. From the Ca ii H and K line intensities of 111 stars observed at Mount Wilson Observatory from 1966 to 1991, we have retrieved data of all 23 G-type stars and recalculated their cycle lengt…
SOFIA/FORCAST Observations of Warm Dust in S106: A Fragmented Environment
Hill, T.; Smith, N.; Fazio, G. G. +22 more
We present mid-IR (19-37 µm) imaging observations of S106 from SOFIA/FORCAST, complemented with IR observations from Spitzer/IRAC (3.6-8.0 µm), IRTF/MIRLIN (11.3 and 12.5 µm), and Herschel/PACS (70 and 160 µm). We use these observations, observations in the literature, and radiation transfer modeling to study the heating an…
Modeling the Power Spectra of Active Galactic Nuclei with Markov Chain Monte Carlo
Marshall, Kevin
We present a new method for calculating the power spectral density (PSD) of a light curve using Markov Chain Monte Carlo principles. This method allows for a faster estimation of PSD parameters, along with more robust estimates of the uncertainties for each parameter. We show that this technique is valid by applying it to a simulated light curve, …
Electron Density of Active Region Outflows Measured by the EUV Imaging Spectrometer on board Hinode
Kitagawa, N.; Yokoyama, T.
In order to better understand the nature of active region outflows, the electron density was measured by using a density-sensitive line pair, Fe xiv 264.78 Å/274.20 Å. Because coronal line profiles of the outflow region are composed of a major component with a Doppler shift of ≤slant 10 km {{s}-1} and a minor component (enhanced blue wi…
High-latitude, Transluscent Molecular Clouds as Probes of Local Cosmic Rays
Abrahams, Ryan D.; Paglione, Timothy A. D.
We analyze the gamma ray emission from nine high latitude, translucent molecular clouds taken with the Fermi Large Area Telescope between 250 MeV and 10 GeV. Observations of gamma rays allow us to probe the density and spectrum of cosmic rays in the solar neighborhood. The clouds studied lie within ∼270 pc from the Sun and are selected from the Pl…
Inertial Range Turbulence of Fast and Slow Solar Wind at 0.72 AU and Solar Minimum
Bruno, Roberto; Zhang, Tielong; Echim, Marius +3 more
We investigate Venus Express observations of magnetic field fluctuations performed systematically in the solar wind at 0.72 Astronomical Units (AU), between 2007 and 2009, during the deep minimum of solar cycle 24. The power spectral densities (PSDs) of the magnetic field components have been computed for time intervals that satisfy the data integ…