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Hypervelocity dust impacts on the Wind spacecraft: Correlations between Ulysses and Wind interstellar dust detections
Horanyi, Mihaly; Andersson, Laila; Malaspina, David M. +1 more
The Wind spacecraft is positioned just sunward of Earth at the first Lagrange point, while the Ulysses spacecraft orbits above and below the ecliptic plane crossing the ecliptic as far from the Sun as the orbit of Jupiter (∼5 AU). While Wind does not carry a dedicated dust detector, we demonstrate the ability of Wind electric field measurements to…
Discovery of a quasi-periodic oscillation in the ultraluminous X-ray source IC 342 X-1: XMM-Newton results
Agrawal, V. K.; Nandi, Anuj
We report the discovery of a quasi-periodic oscillation (QPO) at 642 mHz in an XMM-Newton observation of the ultraluminous X-ray source (ULX) IC 342 X-1. The QPO has a centroid at νQPO = 642 ± 20 mHz, a coherence factor Q = 11.6 and an amplitude (rms) of 4.1 per cent with significance of 3.6σ. The energy dependence study shows that the …
Evolution of mid-infrared galaxy luminosity functions from the entire AKARI NEP deep field with new CFHT photometry
Goto, Tomotsugu; Kim, Seong Jin; Burgarella, Denis +22 more
We present infrared (IR) galaxy luminosity functions (LFs) in the AKARI North Ecliptic Pole (NEP) deep field using recently-obtained, wider Canada-France-Hawaii Telescope (CFHT) optical/near-IR images. AKARI has obtained deep images in the mid-infrared (IR), covering 0.6 deg2 of the NEP deep field. However, our previous work was limited…
An Embedded Active Nucleus in the OH Megamaser Galaxy IRAS16399-0937
Axon, D. J.; Robinson, A.; Elitzur, M. +7 more
We present a multiwavelength study of the OH megamaser galaxy IRAS16399-0937, based on new Hubble Space Telescope (HST)/Advanced Camera for Surveys F814W and Hα+[N II] images and archive data from HST, Two Micron All Sky Survey, Spitzer, Herschel and the Very Large Array. This system has a double nucleus, whose northern (IRAS16399N) and southern (…
Inflation and dark energy from the Brans-Dicke theory
Artymowski, Michał; Lalak, Zygmunt; Lewicki, Marek
We consider the Brans-Dicke theory motivated by the f(R) = R + α Rn - β R2-n model to obtain a stable minimum of the Einstein frame scalar potential of the Brans-Dicke field. As a result we have obtained an inflationary scalar potential with non-zero value of residual vacuum energy, which may be a source of dark energy. In ad…
Do we detect the galactic feedback material in X-ray observations of nearby galaxies? - a case study of NGC 5866
Li, Jiang-Tao
One of the major sources of the X-ray emitting hot gas around galaxies is the feedback from supernovae (SNe), but most of this metal-enriched feedback material is often not directly detected in X-ray observations. This missing galactic feedback problem is extremely prominent in early-type galaxy bulges, where there is little cool gas to make the T…
High-Resolution Observations of a Flux Rope with the Interface Region Imaging Spectrograph
Li, Ting; Zhang, Jun
We report the observations of a flux rope at transition region temperatures with the Interface Region Imaging Spectrograph (IRIS) on 30 August 2014. Initially, magnetic flux cancellation continually took place and a filament was activated. Then the bright material from the filament moved southward and tracked out several fine structures. These fin…
Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
Gary, S. Peter; Fu, Xiangrong; Dong, Chuanfei +1 more
An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe, where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe. Here we present a novel nonlinear mechanism for the formation of thes…
Characterization of the lower layer in the dayside Venus ionosphere and comparisons with Mars
Tellmann, Silvia; Pätzold, Martin; Häusler, Bernd +3 more
The influence of solar zenith angle (SZA) and solar irradiance has been well characterized for the V2 layer in the Venus ionosphere, but not the V1 layer, where previous efforts were limited by data scarcity and incomplete SZA coverage. Here we use more than 200 radio occultation profiles from Venus Express with good SZA coverage to characterize h…
Probing the Physical Properties of z = 4.5 Lyman Alpha Emitters with Spitzer
Finkelstein, Steven L.; Grogin, Norman A.; Tilvi, Vithal +10 more
We present the results from a stellar population modeling analysis of a sample of 162 z = 4.5 and 14 z = 5.7 Lyα emitting galaxies (LAEs) in the Boötes field, using deep Spitzer/IRAC data at 3.6 and 4.5 µm from the Spitzer Lyα Survey, along with Hubble Space Telescope NICMOS and WFC3 imaging at 1.1 and 1.6 µm for a subset of the LAEs. …