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Constraining globular cluster formation through studies of young massive clusters - III. A lack of gas and dust in massive stellar clusters in the LMC and SMC
Bastian, N.; Strader, J.
Scenarios that invoke multiple episodes of star formation within young globular clusters (GCs) to explain the observed chemical and photometric anomalies in GCs require that clusters can retain the stellar ejecta of the stars within them and accrete large amounts of gas from their surroundings. Hence, it should be possible to find young massive cl…
Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle 23
Temmer, M.; Veronig, A.; Klein, K. -L. +3 more
We explore the link between solar energetic particles (SEPs) observed at 1 AU and large-scale disturbances propagating in the solar corona, named after the Extreme ultraviolet Imaging Telescope (EIT) as EIT waves, which trace the lateral expansion of a coronal mass ejection (CME). A comprehensive search for SOHO/EIT waves was carried out for 179 S…
Ruling out the power-law form of the scalar primordial spectrum
Starobinsky, Alexei A.; Hazra, Dhiraj Kumar; Smoot, George F. +1 more
Combining Planck CMB temperature [1] and BICEP2 B-mode polarization data [2,3] we show qualitatively that, assuming inflationary consistency relation, the power-law form of the scalar primordial spectrum is ruled out at more than 3σ CL. This is an important finding, since the power-law form of the scalar primordial spectrum is one of the main assu…
Discovery of the Transient Magnetar 3XMM J185246.6+003317 near Supernova Remnant Kesteven 79 with XMM-Newton
Safi-Harb, Samar; Terada, Yukikatsu; Ge, Ming-Yu +5 more
We report the serendipitous discovery with XMM-Newton that 3XMM J185246.6+003317 is an 11.56 s X-ray pulsar located 1' away from the southern boundary of supernova remnant Kes 79. The spin-down rate of 3XMM J185246.6+003317 is <1.1 × 10-13 s s-1, which, together with the long period P = 11.5587126(4) s, indicates a dipolar…
Star formation histories, extinction, and dust properties of strongly lensed z ~ 1.5-3 star-forming galaxies from the Herschel Lensing Survey
Smail, I.; Altieri, B.; Schaerer, D. +11 more
Context. Multi-wavelength, optical to IR/submm observations of strongly lensed galaxies identified by the Herschel Lensing Survey are used to determine the physical properties of high-redshift star-forming galaxies close to or below the detection limits of blank fields.
Aims: We aim to constrain theIR stellar and dust content, and to determin…
Multiwavelength Observations of the Candidate Disintegrating Sub-Mercury KIC 12557548b
Fortney, Jonathan J.; Howard, Andrew W.; Crepp, Justin R. +11 more
We present multiwavelength photometry, high angular resolution imaging, and radial velocities of the unique and confounding disintegrating low-mass planet candidate KIC 12557548b. Our high angular resolution imaging, which includes space-based Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) observations in the optical (~0.53 µm and ~0.…
Searching for Diffuse Light in the M96 Galaxy Group
Mihos, J. Christopher; Harding, Paul; Feldmeier, John J. +1 more
We present deep, wide-field imaging of the M96 galaxy group (also known as the Leo I Group). Down to surface brightness limits of µ B = 30.1 and µ V = 29.5, we find no diffuse, large-scale optical counterpart to the "Leo Ring," an extended H I ring surrounding the central elliptical M105 (NGC 3379). However, we …
An Expanded HST/WFC3 Survey of M83: Project Overview and Targeted Supernova Remnant Search
Soria, Roberto; Blair, William P.; Whitmore, Bradley C. +7 more
We present an optical/NIR imaging survey of the face-on spiral galaxy M83, using data from the Hubble Space Telescope Wide Field Camera 3 (WFC3). Seven fields are used to cover a large fraction of the inner disk, with observations in nine broadband and narrowband filters. In conjunction with a deep Chandra survey and other new radio and optical gr…
Full-halo coronal mass ejections: Arrival at the Earth
Wang, Yuming; Shen, Chenglong; Wang, S. +3 more
A geomagnetic storm is mainly caused by a frontside coronal mass ejection (CME) hitting the Earth and then interacting with the magnetosphere. However, not all frontside CMEs can hit the Earth. Thus, which CMEs hit the Earth and when they do so are important issues in the study and forecasting of space weather. In our previous work, the deprojecte…
Friction and dynamics of rock avalanches travelling on glaciers
De Blasio, Fabio Vittorio
Rock avalanches travelling on glaciers often exhibit effective friction coefficient lower than those on a rocky terrain. After briefly considering some data of rock avalanches on glaciers, the physics of sliding of solid objects on icy surfaces is reviewed, and a model is put forward for the mechanics of rock avalanche sliding on ice accounting fo…