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A Global Star-forming Episode in M31 2-4 Gyr Ago
Bell, Eric F.; Monachesi, Antonela; Dolphin, Andrew E. +9 more
We have identified a major global enhancement of star formation in the inner M31 disk that occurred between 2-4 Gyr ago, producing ∼60% of the stellar mass formed in the past 5 Gyr. The presence of this episode in the inner disk was discovered by modeling the optical resolved star color-magnitude diagrams of low extinction regions in the main disk…
Understanding the Mg II and Hα Spectra in a Highly Dynamical Solar Prominence
Heinzel, P.; Schmieder, B.; Gunár, S. +1 more
Mg ii h and k and Hα spectra in a dynamical prominence have been obtained along the slit of the Interface Region Imaging Spectrograph (IRIS) and with the Meudon Multi-channel Subtractive Double Pass spectrograph on 2013 September 24, respectively. Single Mg ii line profiles are not much reversed, while at some positions along the IRIS slit the pro…
Predicting dust extinction properties of star-forming galaxies from Hα/UV ratio
Yamamura, Issei; Takita, Satoshi; Koyama, Yusei +8 more
Using star-forming galaxies sample in the nearby Universe (0.02 < z < 0.10) selected from the Sloan Digital Sky Survey (DR7) and Galaxy Evolution Explorer all-sky survey (GR5), we present a new empirical calibration for predicting dust extinction of galaxies from the Hα-to-FUV flux ratio. We find that the Hα dust extinction (AHα) …
A new, fast and flexible radiative transfer method for Venus general circulation models
Wilson, C. F.; Read, P. L.; Lee, C. +1 more
We present a new radiation scheme for the Oxford Planetary Unified Model System for Venus, suitable for the solar and thermal bands. This new and fast radiative parameterization uses a different approach in the two main radiative wavelength bands: solar radiation (0.1 - 5.5 µm) and thermal radiation (1.7 - 260 µm). The solar radiation …
Properties of a Coronal Shock Wave as a Driver of Early SEP Acceleration
Raymond, J. C.; Lobzin, V. V.; Kozarev, K. A. +1 more
Coronal mass ejectmons (CMEs) are thought to drive collisionless shocks in the solar corona, which in turn have been shown to be capable of accelerating solar energetic particles (SEPs) in minutes. It has been notoriously difficult to extract information about energetic particle spectra in the corona, owing to a lack of in situ measurements. It is…
A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers. II. Program Design, Absorption-line Measurements, and Absorber Statistics
Tripp, Todd M.; Prochaska, J. Xavier; Tumlinson, Jason +6 more
To investigate the evolution of metal-enriched gas over recent cosmic epochs as well as to characterize the diffuse, ionized, metal-enriched circumgalactic medium, we have conducted a blind survey for C iv absorption systems in 89 QSO sightlines observed with the Hubble Space Telescope Cosmic Origins Spectrograph. We have identified 42 absorbers a…
Fine structure above a light bridge in the transition region and corona
Bharti, L.
We present the results of multiwavelength, co-spatial and near co-temporal observations of jets above a sunspot light bridge (LB). The data were obtained with the Solar Optical Telescope on board Hinode, the Interface Region Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamic Observatory. Most of the jets in the Ca …
Kinematic Classifications of Local Interacting Galaxies: Implications for the Merger/Disk Classifications at High-z
Casey, Caitlin M.; Kewley, Lisa J.; Sanders, D. B. +6 more
The classification of galaxy mergers and isolated disks is key for understanding the relative importance of galaxy interactions and secular evolution during the assembly of galaxies. Galaxy kinematics as traced by emission lines have been used to suggest the existence of a significant population of high-z star-forming galaxies consistent with isol…
On the Progenitor System of the Type Iax Supernova 2014dt in M61
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +5 more
We present pre-explosion and post-explosion Hubble Space Telescope images of the Type Iax supernova (SN Iax) 2014dt in M61. After astrometrically aligning these images, we do not detect any stellar sources at the position of the SN in the pre-explosion images to relatively deep limits (3σ limits of M F438W > -5.0 mag and M F814W…
Distribution of energetic oxygen and hydrogen in the near-Earth plasma sheet
Delcourt, D. C.; Dandouras, I.; Daly, P. W. +5 more
The spatial distributions of different ion species are useful indicators for plasma sheet dynamics. In this statistical study based on 7 years of Cluster observations, we establish the spatial distributions of oxygen ions and protons at energies from 274 to 955 keV, depending on geomagnetic and solar wind (SW) conditions. Compared with protons, th…