Search Publications
Radio Follow-up on All Unassociated Gamma-Ray Sources from the Third Fermi Large Area Telescope Source Catalog
Edwards, Philip G.; Petrov, Leonid; Schinzel, Frank K. +1 more
The third Fermi Large Area Telescope γ-ray source catalog (3FGL) contains over 1000 objects for which there is no known counterpart at other wavelengths. The physical origin of the γ-ray emission from those objects is unknown. Such objects are commonly referred to as unassociated and mostly do not exhibit significant γ-ray flux variability. We per…
Constraints on the Distance Moduli, Helium, and Metal Abundances, and Ages of Globular Clusters from Their RR Lyrae and Non-variable Horizontal Branch Stars. II. Multiple Stellar Populations in 47 Tuc, M3, and M13
VandenBerg, Don A.; Denissenkov, Pavel A.; Kopacki, Grzegorz +1 more
We present a new set of horizontal branch (HB) models computed with the MESA stellar evolution code. The models adopt α-enhanced Asplund et al. metal mixtures and include the gravitational settling of He. They are used in our HB population synthesis tool to generate theoretical distributions of HB stars in order to describe the multiple stellar po…
Multiwavelength Study of the Star Formation in the S237 H II Region
Dewangan, L. K.; Ojha, D. K.; Zinchenko, I. +2 more
We present a detailed multiwavelength study of observations from X-ray, near-infrared, and centimeter wavelengths to probe the star formation processes in the S237 region. Multiwavelength images trace an almost sphere-like shell morphology of the region, which is filled with the 0.5-2 keV X-ray emission. The region contains two distinct environmen…
The Young L Dwarf 2MASS J11193254-1137466 Is a Planetary-mass Binary
Magnier, Eugene A.; Dupuy, Trent J.; Liu, Michael C. +1 more
We have discovered that the extremely red, low-gravity L7 dwarf 2MASS J11193254-1137466 is a 0.″14 (3.6 au) binary using Keck laser guide star adaptive optics imaging. 2MASS J11193254-1137466 has previously been identified as a likely member of the TW Hydrae Association (TWA). Using our updated photometric distance and proper motion, a kinematic a…
The AGN-Star Formation Connection: Future Prospects with JWST
Barro, Guillermo; Santini, Paola; Grogin, Norman A. +13 more
The bulk of the stellar growth over cosmic time is dominated by IR-luminous galaxies at cosmic noon (z=1{--}2), many of which harbor a hidden active galactic nucleus (AGN). We use state-of-the-art infrared color diagnostics, combining Spitzer and Herschel observations, to separate dust-obscured AGNs from dusty star-forming galaxies (SFGs) in the C…
Characterizing the Transition from Diffuse Atomic to Dense Molecular Clouds in the Magellanic Clouds with [C II], [C I], and CO
Ott, Jürgen; Hughes, Annie; Wong, Tony +8 more
We present and analyze deep Herschel/HIFI observations of the [C II] 158 µm, [C I] 609 µm, and [C I] 370 µm lines toward 54 lines of sight in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC). These observations are used to determine the physical conditions of the line-emitting gas, which we use to study the trans…
New Evidence for a Coronal Mass Ejection-driven High Frequency Type II Burst near the Sun
Kumari, Anshu; Ramesh, R.; Kathiravan, C. +1 more
We report observations of the high frequency type II radio burst (≈430-30 MHz) that occurred in the solar corona on 2015 November 4. The drift rate of the burst, estimated close to the start frequency of its fundamental component (≈215 MHz), is unusually high (≈2 MHz s-1). Our analysis shows that the estimated speed of the magnetohydrod…
Turbulent Transport in a Three-dimensional Solar Wind
Bruno, R.; Zank, G. P.; Shiota, D. +3 more
Turbulence in the solar wind can play essential roles in the heating of coronal and solar wind plasma and the acceleration of the solar wind and energetic particles. Turbulence sources are not well understood and thought to be partly enhanced by interaction with the large-scale inhomogeneity of the solar wind and the interplanetary magnetic field …
A High Space Density of Luminous Lyman Alpha Emitters at z ∼ 6.5
Bagley, Micaela B.; Martin, Crystal L.; Garel, Thibault +16 more
We present the results of a systematic search for Lyα emitters (LAEs) at 6≲ z≲ 7.6 using the HST WFC3 Infrared Spectroscopic Parallel (WISP) Survey. Our total volume over this redshift range is ∼ 8× {10}5 Mpc3, comparable to many of the narrowband surveys despite their larger area coverage. We find two LAEs at z = 6.38 and 6.…
Carbon Chain Anions and the Growth of Complex Organic Molecules in Titan’s Ionosphere
Lewis, G. R.; Coates, A. J.; Kataria, D. O. +13 more
Cassini discovered a plethora of neutral and ionized molecules in Titan’s ionosphere including, surprisingly, anions and negatively charged molecules extending up to 13,800 u q-1. In this Letter, we forward model the Cassini electron spectrometer response function to this unexpected ionospheric component to achieve an increased mass res…