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Herschel Extreme Lensing Line Observations: [CII] Variations in Galaxies at Redshifts z=1-3
Carilli, Chris; Papovich, Casey; Strauss, Michael A. +14 more
We observed the [C II] line in 15 lensed galaxies at redshifts 1 < z < 3 using HIFI on the Herschel Space Observatory and detected 14/15 galaxies at 3σ or better. High magnifications enable even modestly luminous galaxies to be detected in [C II] with Herschel. The [C II] luminosity in this sample ranges from 8 × 107 L⊙…
On the physical reality of overlooked open clusters
Piatti, Andrés E.
We present UBVRI and CT1T2 photometry for 15 catalogued open clusters of relative high brightness and compact appearance. From these unprecedented photometric data sets, covering wavelengths from the blue up to the near-infrared, we performed a thorough assessment of their reality as stellar aggregates. We statistically assig…
Herschel observations of the circumstellar environments of the Herbig Be stars R Mon and PDS 27
Eiroa, C.; Montesinos, B.; Henning, T. +4 more
Context. The circumstellar environments of Herbig Be stars in the far-infrared are poorly characterised, mainly because they are often embedded and rather distant. The analysis of far-infrared spectroscopy allows us to make a major step forward by covering multiple rotational lines of molecules, e.g. CO, that are useful probes of the physical cond…
A sensitive search for unknown spectral emission lines in the diffuse X-ray background with XMM-Newton
Schmitt, J. H. M. M.; Horns, D.; Gewering-Peine, A.
The Standard Model of particle physics can be extended to include sterile (right-handed) neutrinos or axions to solve the dark matter problem. Depending upon the mixing angle between active and sterile neutrinos, the latter have the possibility to decay into monoenergetic active neutrinos and photons in the keV-range while axions can couple to two…
Absence of the strahl during times of slow wind
Goldstein, Melvyn L.; Gurgiolo, Chris
It is not uncommon during periods when the solar wind speed is less than 425 km s-1 to observe near 1 AU no evidence of a strahl population in either the electron solar wind or within the foreshock. Estimating the fluid flow within each energy step returned from the Plasma Electron And Current Experiment (PEACE) on board Cluster-2 often…
The vertical transport of methane from different potential emission types on Mars
Patel, M. R.; Lewis, S. R.; Holmes, J. A.
The contrasting evolutionary behavior of the vertical profile of methane from three potential release scenarios is analyzed using a global circulation model with assimilated temperature profiles. Understanding the evolving methane distribution is essential for interpretation of future retrievals of the methane vertical profile taken by instruments…
Derivation of sideband gain ratio for Herschel/HIFI
Kester, Do; Higgins, Ronan; Teyssier, David
Context. Heterodyne mixers are commonly used for high-resolution spectroscopy at radio telescopes. When used as a double sideband system, the accurate flux calibration of spectral lines acquired by those detectors is highly dependent on the system gains in the respective mixer sidebands via the so-called sideband gain ratio (SBR). As such, the SBR…
Spatially radiative properties of 3C 58 and G21.5-0.9
Zhang, Li; Lu, Fang-Wu; Gao, Quan-Gui +1 more
Observations of two pulsar wind nebulae (PWNe) 3C 58 and G21.5-0.9 indicate that they have mostly symmetric spherical morphologies, emit photons from radio to γ-rays and have the radial variations of the photon indices in X-ray band. The spatially radiative properties of 3C 58 and G21.5-0.9 are modelled in the frame of a spatially dependent model.…
A method to predict magnetopause expansion in radial IMF events by MHD simulations
Å afránková, J.; Němeček, Z.; Sibeck, D. G. +2 more
This paper presents a method for taking into account changes of solar wind parameters in the foreshock using global MHD simulations. We simulate four events with very distant subsolar magnetopause crossings that occurred during quasi-radial interplanetary magnetic field (IMF) intervals lasting from one to several hours. Using previous statistical …
Precise CCD positions of Himalia using Gaia DR1 in 2015-2016
Wang, N.; Peng, Q. Y.; Peng, H. W.
In order to obtain high-precision CCD positions of Himalia, the sixth Jovian satellite, a total of 598 CCD observations have been obtained during the years 2015-2016. The observations were made by using the 2.4 and 1 m telescopes administered by Yunnan Observatories over 27 nights. Several factors that would influence the positional precision of H…