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A Census of Star Formation in the Outer Galaxy. II. The GLIMPSE360 Field
Hora, Joseph L.; Tolls, Volker; Winston, Elaine
We have conducted a study of star formation in the outer Galaxy from 65°< l < 265° in the region observed by the GLIMPSE360 program. This Spitzer warm mission program mapped the plane of the outer Milky Way with IRAC at 3.6 and 4.5 µm. We combine the IRAC, Wide-field Infrared Survey Explorer (WISE), and Two Micron All Sky Survey catalo…
Far-ultraviolet aurora identified at comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Feldman, P. D.; Carr, C. +14 more
Having a nucleus darker than charcoal, comets are usually detected from Earth through the emissions from their coma. The coma is an envelope of gas that forms through the sublimation of ices from the nucleus as the comet gets closer to the Sun. In the far-ultraviolet portion of the spectrum, observations of comae have revealed the presence of atom…
The Deflection of Coronal Mass Ejections by the Ambient Coronal Magnetic Field Configuration
Liu, Siqing; Wang, Jingjing; Hoeksema, J. Todd
Solar coronal mass ejections (CMEs) are sometimes deflected during their propagation. This deflection may be the consequence of an interaction between the CME and the ambient coronal field, for example, a coronal hole, or the solar wind. The coronal magnetic field configuration is computed from daily synoptic maps of magnetic field from SOHO/MDI a…
Unveiling pure-metal ejecta X-ray emission in supernova remnants through their radiative recombination continuum
Greco, Emanuele; Vink, Jacco; Miceli, Marco +5 more
Context. Spectral analysis of X-ray emission from ejecta in supernova remnants (SNRs) is hampered by the low spectral resolution of CCD detectors, which typically creates a degeneracy between the best-fit values of chemical abundances and the plasma emission measure. The combined contribution of shocked ambient medium and ejecta to the emerging X-…
S2COSMOS: Evolution of gas mass with redshift using dust emission
Małek, K.; Ao, Y.; Ho, L. C. +15 more
We investigate the evolution of the gas mass fraction for galaxies in the COSMOS field using submillimetre emission from dust at 850 µm. We use stacking methodologies on the 850 µm S2COSMOS map to derive the gas mass fraction of galaxies out to high redshifts, 0 ≤ z ≤ 5, for galaxies with stellar masses of 109.5 < M*…
Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars
Coti Zelati, Francesco; Torres, Diego F.; Li, Jian +1 more
We report on a detailed spectral characterization of the non-thermal X-ray emission for a large sample of gamma-ray pulsars in the second Fermi Large Area Telescope catalogue. We outline the criteria adopted for the selection of our sample, its completeness, and critically describe different approaches to estimate the spectral shape and flux of pu…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XXI. Binaries among multiple stellar populations
Salaris, M.; Anderson, J.; Milone, A. P. +17 more
A number of scenarios for the formation of multiple populations in globular clusters (GCs) predict that second generation (2G) stars form in a compact and dense subsystem embedded in a more extended first-generation (1G) system. If these scenarios are accurate, a consequence of the denser 2G formation environment is that 2G binaries should be more…
A versatile tool for cluster lensing source reconstruction - I. Methodology and illustration on sources in the Hubble Frontier Field Cluster MACS J0717.5+3745
Treu, Tommaso; Birrer, Simon; Yang, Lilan
We describe a general-purpose method to reconstruct the intrinsic properties of sources lensed by the gravitational potential of foreground clusters of galaxies. The tool LENSTRUCTION is implemented in the publicly available multipurpose gravitational lensing software LENSTRONOMY, in order to provide an easy and fast solution to this common astrop…
An expanded catalogue of low surface brightness galaxies in the Coma cluster using Subaru/Suprime-Cam
Forbes, Duncan A.; Romanowsky, Aaron J.; Alabi, Adebusola B. +2 more
We present a catalogue of low surface brightness (LSB) galaxies in the Coma cluster obtained from deep Subaru/Suprime-Cam V- and R-band imaging data within a region of $\mathord {\sim }4$ deg2. We increase the number of LSB galaxies presented in Yagi et al. (2016) by a factor of $\mathord {\sim }3$ and report the discovery of 29 new ult…
Surveying the Giant H II Regions of the Milky Way with SOFIA. II. M17
Lim, Wanggi; De Buizer, James M.; Radomski, James T.
We present our second set of results from our mid-infrared imaging survey of Milky Way giant H II regions. We used the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) to obtain 20 and 37 µm images of the central ∼10' × 10' area of M17. We investigate the small- and large-scale properties of M17 using our da…