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The outflow of gas from the Centaurus A circumnuclear disk. Atomic spectral line maps from Herschel/PACS and APEX
Stutzki, J.; Güsten, R.; Requena-Torres, M. A. +2 more
The physical state of the gas in the central 500 pc of NGC 5128 (the radio galaxy Centaurus A), was investigated using the fine-structure lines of carbon [CI], [CII]; oxygen [OI], [OIII], and nitrogen [NII], [NIII] as well as the 12CO(4-3) molecular line. The circumnuclear disk (CND) is traced by emission from dust and the neutral gas (…
Statistical study of polar negative magnetic bays driven by interplanetary fast-mode shocks
Liou, Kan; Sotirelis, Thomas; Gjerloev, Jesper
The question of whether an interplanetary (IP) fast-mode shock can trigger the substorm expansion is still not resolved. Some scientists believe that the substorm expansion can be triggered by a sudden compression of the magnetosphere if a substorm growth phase is in progress (e.g., the magnetosphere precondition hypothesis). Such a hypothesis has…
Physical Properties of the Very Young PN Hen3-1357 (Stingray Nebula) Based on Multiwavelength Observations
Hubrig, S.; Otsuka, Masaaki; Parthasarathy, M. +1 more
We carried out a detailed analysis of the interesting and important very young planetary nebula (PN) Hen3-1357 (Stingray Nebula) based on a unique data set of optical to far-IR spectra and photometric images. We calculated the abundances of nine elements using collisionally excited lines (CELs) and recombination lines (RLs). The RL C/O ratio indic…
A catalogue of white dwarf candidates in VST ATLAS
Hermes, J. J.; Raddi, Roberto; Gänsicke, Boris T. +6 more
The Sloan Digital Sky Survey (SDSS) has created a knowledge gap between the Northern and the Southern hemispheres, which is very marked for white dwarfs: Only ≃15 per cent of the known white dwarfs are south of the equator. Here, we make use of the VLT Survey Telescope (VST) ATLAS survey, one of the first surveys obtaining deep, optical, multiband…
X-Ray Studies of the Extended TeV Gamma-Ray Source VER J2019+368
Mizuno, T.; Takahashi, H.; Katsuta, J. +3 more
This article reports the results of X-ray studies of the extended TeV γ-ray source VER J2019+368. Suzaku observations conducted to examine properties of the X-ray pulsar wind nebula (PWN) around PSR J2021+3651 revealed that the western region of the X-ray PWN has a source extent of 15\prime × 10\prime with the major axis orie…
Cosmological models with running cosmological term and decaying dark matter
Szydłowski, Marek; Stachowski, Aleksander
We investigate the dynamics of the generalized ΛCDM model, which the Λ term is running with the cosmological time. On the example of the model Λ(t) =Λbare + α2/t2 we show the existence of a mechanism of the modification of the scaling law for energy density of dark matter: ρdm ∝a - 3 + λ(t). W…
Near-infrared variability study of the central 2.3 arcmin × 2.3 arcmin of the Galactic Centre - I. Catalogue of variable sources
Morris, Mark R.; Williams, Benjamin F.; Do, Tuan +7 more
We used 4-yr baseline Hubble Space Telescope/Wide Field Camera 3 IR observations of the Galactic Centre in the F153M band (1.53 µm) to identify variable stars in the central ∼2.3 arcmin × 2.3 arcmin field. We classified 3845 long-term (periods from months to years) and 76 short-term (periods of a few days or less) variables among a total sam…
Variations between Dust and Gas in the Diffuse Interstellar Medium. II. Search for Cold Gas
Heiles, Carl; Reach, William T.; Bernard, Jean-Philippe
The content of interstellar clouds, in particular the inventory of diffuse molecular gas, remains uncertain. We identified a sample of isolated clouds, approximately 100 M⊙ in size, and used the dust content to estimate the total amount of gas. In Paper I, the total inferred gas content was found significantly larger than that seen in 2…
Optical and ultraviolet spectroscopic analysis of SN 2011fe at late times
Filippenko, Alexei V.; Foley, Ryan J.; Pan, Yen-Chen +16 more
We present optical spectra of the nearby Type Ia supernova SN 2011fe at 100, 205, 311, 349 and 578 d post-maximum light, as well as an ultraviolet (UV) spectrum obtained with the Hubble Space Telescope at 360 d post-maximum light. We compare these observations with synthetic spectra produced with the radiative transfer code phoenix. The day +100 s…
Magnetically controlled density structures in the topside layer of the Martian ionosphere
Venkateswara Rao, N.; Mohanamanasa, P.; Rao, S. V. B.
Magnetically controlled density structures in the main layer of the Martian ionosphere are regularly detected by the Mars Advance Radar for Subsurface and Ionospheric Sounder (MARSIS) on board the Mars Express spacecraft when it passes over the regions of strong crustal magnetic fields. These structures appear as oblique echoes in an ionogram and …