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Waves in high-speed plasmoids in the magnetosheath and at the magnetopause
Gunell, H.; Dandouras, I.; Nilsson, H. +9 more
Plasmoids, defined here as plasma entities with a higher anti-sunward velocity component than the surrounding plasma, have been observed in the magnetosheath in recent years. During the month of March 2007 the Cluster spacecraft crossed the magnetopause near the subsolar point 13 times. Plasmoids with larger velocities than the surrounding magneto…
Directly imaging damped Lyα galaxies at z > 2 - II. Imaging and spectroscopic observations of 32 quasar fields
Prochaska, J. Xavier; Fumagalli, Michele; Kanekar, Nissim +2 more
Damped Lyα absorbers (DLAs) are a well-studied class of absorption line systems, and yet the properties of their host galaxies remain largely unknown. To investigate the origin of these systems, we have conducted an imaging survey of 32 quasar fields with intervening DLAs between z ∼ 1.9 and 3.8, leveraging a technique that allows us to image gala…
Shockingly low water abundances in Herschel/PACS observations of low-mass protostars in Perseus
Fedele, D.; van Dishoeck, E. F.; Evans, N. J. +16 more
Context. Protostars interact with their surroundings through jets and winds impinging on the envelope and creating shocks, but the nature of these shocks is still poorly understood.
Aims: Our aim is to survey far-infrared molecular line emission from a uniform and significant sample of deeply-embedded low-mass young stellar objects (YSOs) in …
Temperature dependence of the sublimation rate of water ice: Influence of impurities
Kossacki, Konrad J.; Leliwa-Kopystynski, Jacek
The sublimation rate of ice is commonly calculated using the simple Hertz-Knudsen formula. This formula is derived from the kinetic theory of gases and ignores microphysical processes determining the actual sublimation rate. The microphysical processes can be accounted for by including the temperature dependent sublimation coefficient (Kossacki, K…
Properties of Submillimeter Galaxies in the CANDELS GOODS-South Field
Barro, Guillermo; Castellano, Marco; Ferguson, Henry C. +29 more
We derive physical properties of 10 submillimeter galaxies located in the CANDELS coverage of the GOODS-S field. The galaxies were first identified as submillimeter sources with the LABOCA bolometer and subsequently targeted for 870 µm continuum observation with ALMA. The high angular resolution of the ALMA imaging allows secure counterparts…
New Clues to the Cause of Extended Main-Sequence Turnoffs in Intermediate-age Star Clusters in the Magellanic Clouds
Goudfrooij, Paul; Puzia, Thomas H.; Correnti, Matteo +3 more
We use the Wide Field Camera 3 on board the Hubble Space Telescope (HST) to obtain deep, high-resolution images of two intermediate-age star clusters in the Large Magellanic Cloud of relatively low mass (≈104 M ⊙) and significantly different core radii, namely NGC 2209 and NGC 2249. For comparison purposes, we also reanalyzed…
Stellar tidal disruption candidates found by cross-correlating the ROSAT Bright Source Catalogue and XMM-Newton observations
Sazonov, S.; Khabibullin, I.
We performed a systematic search for stellar tidal disruption events (TDE) by looking for X-ray sources that were detected during the ROSAT All Sky Survey and faded by more than an order of magnitude over the next two decades according to XMM-Newton serendipitous observations. Besides a number of highly variable persistent X-ray sources (like acti…
Magnetopause reconnection and energy conversion as influenced by the dipole tilt and the IMF Bx
Palmroth, Minna; Hoilijoki, Sanni; Souza, Vitor M. +2 more
We study the effect of Earth's dipole tilt angle and interplanetary magnetic field (IMF) Bx and By components on the location of reconnection and the energy conversion at the magnetopause. We simulate southward IMF satisfying both inward- and outward-type Parker spiral conditions during three different dipole tilt angles usin…
Volcano-ice interactions in the Arsia Mons tropical mountain glacier deposits
Head, James W.; Marchant, David R.; Wilson, Lionel +1 more
Fan-shaped deposits (FSD) superposed on the sides of the Tharsis Montes volcanic edifices are widely interpreted to have been formed by cold-based glaciation during the Late Amazonian, a period when the Tharsis Montes were volcanically active. We survey the ∼166,000 km2 Arsia Mons FSD using new, high-resolution image and topography data…
Variation of the solar magnetic flux spectrum during solar cycle 23
Wang, J. X.; Jin, C. L.
By using the unique database of Solar and Heliospheric Observatory/Michelson Doppler Imager full disk magnetograms from September 1996 to January 2011, covering the entire solar cycle 23, we analyze the time-variability of the solar magnetic flux spectrum and study the properties of extended minimum of cycle 23. We totally identify 11.5 million ma…