Search Publications
27 August 2001 substorm: Preonset phenomena, two main onsets, field-aligned current systems, and plasma flow channels in the ionosphere and in the magnetosphere
Moiseev, A. V.; Wang, J. Y.; Mishin, V. M. +2 more
We supplement the results of the 27 August 2001 substorm studied earlier in the series of papers. Described is the plasma flow in the nightside ionosphere from the near-polar region from the polar cap to the auroral oval during the substorm preonset phase and two expansion onsets, EO1 and EO2, produced by reconnection in the closed tail (magnetic …
The SCUBA-2 Ambitious Sky Survey: a catalogue of beam-sized sources in the Galactic longitude range 120°-140°
Chrysostomou, Antonio; Serjeant, Stephen; Evans, A. +13 more
The SCUBA-2 Ambitious Sky Survey (SASSy) is composed of shallow 850-µm imaging using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) on the James Clerk Maxwell Telescope. Here we describe the extraction of a catalogue of beam-sized sources from a roughly 120 deg2 region of the Galactic plane mapped uniformly (to an rms l…
The Nuclear X-Ray Emission-line Structure in NGC 2992 Revealed by Chandra-HETGS
Nowak, M. A.; Marshall, H. L.; Murphy, K. D.
We present the narrow emission-line structure revealed by a 135 ks Chandra observation of Seyfert galaxy NGC 2992, using the High Energy Transmission Grating Spectrometer. The source was observed in an historically low-flux state. Using a Bayesian Block search technique, we detected neutral Si Kα and S Kα fluorescence and two additional lines that…
The effect of X-ray dust scattering on a bright burst from the magnetar 1E 1547.0-5408
Pintore, Fabio; Mereghetti, Sandro; Esposito, Paolo +3 more
A bright burst, followed by an X-ray tail lasting ∼10 ks, was detected during an XMM-Newton observation of the magnetar 1E 1547.0-5408 carried out on 2009 February 3. The burst, also observed by Swift/BAT, had a spectrum well fitted by the sum of two blackbodies with temperatures of ∼4 and 10 keV and a fluence in the 0.3-150 keV energy range of ∼1…
Geomorphological and spectrophotometric analysis of Seth's circular niches on comet 67P/Churyumov-Gerasimenko using OSIRIS images
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
We provide a detailed geomorphological and spectrophotometric analysis of the circular niches located on the Seth region of 67P using OSIRIS images. The features can be related to landslide events that occurred on 67P and shaped its surface, as the recent Aswan cliff collapse detected in the same region. We therefore provide an analysis of the are…
A study of the long term evolution in active region upflows
Harra, Louise K.; Ugarte-Urra, Ignacio; Baker, Deborah +5 more
Since their discovery, upflows at the edges of active regions have attracted a lot of interest, primarily as they could potentially contribute to the slow solar wind. One aspect that has not been studied yet is how the long term evolution of active regions impacts the upflows. In this work, we analyze one active region that survives three solar ro…
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…