Search Publications
TeV Gamma-Ray Observations of the Galactic Center Ridge by VERITAS
Pelassa, V.; Archer, A.; Benbow, W. +73 more
The Galactic Center ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component and the point sources G0.9+0.1 (a composite supernova remnant) and Sgr A* (believed to be associated with the supermassive black hole located at the center of our Galaxy). Prev…
The Grism Lens-Amplified Survey from Space (GLASS). VII. The Diversity of the Distribution of Star Formation in Cluster and Field Galaxies at 0.3 less than or equal to z less than or equal to 0.7
Pentericci, Laura; Schmidt, Kasper B.; Treu, Tommaso +10 more
Exploiting the slitless spectroscopy taken as part of the Grism Lens-Amplified Survey from Space (GLASS), we present an extended analysis of the spatial distribution of star formation in 76 galaxies in 10 clusters at 0.3\lt z\lt 0.7. We use 85 foreground and background galaxies in the same redshift range as a field sample. The samples are well mat…
A Microfilament-eruption Mechanism for Solar Spicules
Moore, Ronald L.; Sterling, Alphonse C.
Recent investigations indicate that solar coronal jets result from eruptions of small-scale chromospheric filaments, called minifilaments; that is, the jets are produced by scaled-down versions of typical-sized filament eruptions. We consider whether solar spicules might in turn be scaled-down versions of coronal jets, being driven by eruptions of…
Enhanced Star Formation of Less Massive Galaxies in a Protocluster at z = 2.5
Suzuki, Tomoko L.; Koyama, Yusei; Kodama, Tadayuki +5 more
We investigate a correlation between star formation rate (SFR) and stellar mass for Hα emission-line galaxies (HAEs) in one of the richest protoclusters ever known at z ∼ 2.5, the USS 1558-003 protocluster. This study is based on a 9.7 hr narrowband imaging data with MOIRCS on the Subaru telescope. We are able to construct a sample in combination …
The ISLANDS Project. I. Andromeda XVI, An Extremely Low Mass Galaxy Not Quenched by Reionization
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +14 more
Based on data aquired in 13 orbits of Hubble Space Telescope time, we present a detailed evolutionary history of the M31 dSph satellite Andromeda XVI, including its lifetime star formation history (SFH), the spatial distribution of its stellar populations, and the properties of its variable stars. And XVI is characterized by prolonged star formati…
Spectral Properties of Large Gradual Solar Energetic Particle Events. I. Fe, O, and Seed Material
Cohen, C. M. S.; Mewaldt, R. A.; Schwadron, N. A. +7 more
We have surveyed ∼0.1-100 MeV nucleon-1 O and Fe fluence spectra during 46 isolated, large gradual SEP events observed at ACE during solar cycles 23 and 24. Most SEP spectra are well represented by the four-parameter Band function with a normalization constant, low-energy spectral slope, high-energy spectral slope, and break energy. The…
NGC 6362: The Least Massive Globular Cluster with Chemically Distinct Multiple Populations
Dalessandro, Emanuele; Salaris, Maurizio; Mucciarelli, Alessio +6 more
We present the first measure of Fe and Na abundances in NGC 6362, a low-mass globular cluster (GC) where first- and second-generation stars are fully spatially mixed. A total of 160 member stars (along the red giant branch (RGB) and the red horizontal branch (RHB)) were observed with the multi-object spectrograph FLAMES at the Very Large Telescope…
How Lyman Alpha Emission Depends on Galaxy Stellar Mass
Finkelstein, Steven L.; Blanc, Guillermo A.; Oyarzún, Grecco A. +6 more
In this work, we show how the stellar mass (M *) of galaxies affects the 3 < z < 4.6 Lyα equivalent width (EW) distribution. To this end, we design a sample of 629 galaxies in the M * range 7.6\lt {log}{M}*/{M}⊙ \lt 10.6 from the 3D-HST/CANDELS survey. We perform spectroscopic observations of this …
The Case for PSR J1614-2230 as a NICER Target
Miller, M. Coleman
The Neutron star Interior Composition ExploreR (NICER) is expected to launch in 2017 and will gather X-ray data on neutron stars and other high-energy sources from a berth on the International Space Station. Its prime scientific goal is to measure the masses and radii of non-accreting neutron stars via fits to the energy-dependent waveforms produc…
NUSTAR Unveils a Heavily Obscured Low-luminosity Active Galactic Nucleus in the Luminous Infrared Galaxy NGC 6286
Sanders, D. B.; Stern, D.; Treister, E. +8 more
We report the detection of a heavily obscured active galactic nucleus (AGN) in the luminous infrared galaxy (LIRG) NGC 6286 identified in a 17.5 ks Nuclear Spectroscopic Telescope Array observation. The source is in an early merging stage and was targeted as part of our ongoing NuSTAR campaign observing local luminous and ultra-luminous infrared g…