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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…
Ultraviolet to optical diffuse sky emission as seen by the Hubble Space Telescope Faint Object Spectrograph
Oyabu, Shinki; Brandt, Timothy D.; Matsuoka, Yoshiki +5 more
We present an analysis of the blank-sky spectra observed with the Faint Object Spectrograph on board the Hubble Space Telescope. We study the diffuse sky emission from ultraviolet to optical wavelengths, which is composed of zodiacal light (ZL), diffuse Galactic light (DGL), and residual emission. The observations were performed towards 54 fields …
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…
G10/COSMOS: 38 band (far-UV to far-IR) panchromatic photometry using LAMBDAR
Robotham, Aaron S. G.; Davies, L. J. M.; Driver, S. P. +3 more
We present a consistent total flux catalogue for a ∼1 deg2 subset of the Cosmic Evolution Survey (COSMOS) region (RA ∈ [149.55°, 150.65°], Dec. ∈ [1.80°, 2.73°]) with near-complete coverage in 38 bands from the far-ultraviolet to the far-infrared. We produce aperture matched photometry for 128 304 objects with I < 24.5 in a manner th…
ALMA 1.3 mm Map of the HD 95086 System
MacGregor, Meredith A.; Hughes, A. Meredith; Matthews, Brenda C. +11 more
Planets and minor bodies such as asteroids, Kuiper-Belt objects, and comets are integral components of a planetary system. Interactions among them leave clues about the formation process of a planetary system. The signature of such interactions is most prominent through observations of its debris disk at millimeter wavelengths where emission is do…
Measurements of the electrostatic potential of Rosetta at comet 67P
Nilsson, H.; Eriksson, A. I.; Johansson, F. L. +3 more
We present and compare measurements of the spacecraft potential (Vs/c) of the Rosetta spacecraft throughout its stay in the inner coma of comet 67P/Churyumov-Gerasimenko, by the Rosetta Plasma Consortium-LAngmuir Probe (RPC-LAP) and Ion Composition Analyzer (RPC-ICA) instruments. Vs/c has mainly been negative, driven by the h…
On the timing properties of SAX J1808.4-3658 during its 2015 outburst
Sanna, A.; Tailo, M.; Papitto, A. +7 more
We present a timing analysis of the 2015 outburst of the accreting millisecond X-ray pulsar SAX J1808.4-3658, using non-simultaneous XMM-Newton and NuSTAR observations. We estimate the pulsar spin frequency and update the system orbital solution. Combining the average spin frequency from the previous observed, we confirm the long-term spin-down at…
Interstellar filaments and star formation
André, Philippe
Recent studies of the nearest star-forming clouds of the Galaxy at submillimeter wavelengths with the Herschel Space Observatory have provided us with unprecedented images of the initial conditions and early phases of the star formation process. The Herschel images reveal an intricate network of filamentary structure in every interstellar cloud. T…