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Discovery of a diffuse optical line emitting halo in the core of the Centaurus cluster of galaxies: line emission outside the protection of the filaments
Fabian, A. C.; Combes, F.; Salomé, P. +6 more
We present the discovery of diffuse optical line emission in the Centaurus cluster seen with the MUSE (Multi Unit Spectroscopic Explorer) integral field unit. The unparalleled sensitivity of MUSE allows us to detect the faint emission from these structures which extend well beyond the bounds of the previously known filaments. Diffuse structures (e…
Stellar Pulsation and the Production of Dust and Molecules in Galactic Carbon Stars
McDonald, Iain; Sloan, G. C.; Groenewegen, Martin A. T. +3 more
New infrared spectra of 33 Galactic carbon stars from FORCAST on SOFIA reveal strong connections between stellar pulsations and the dust and molecular chemistry in their circumstellar shells. A sharp boundary in overall dust content, which predominantly measures the amount of amorphous carbon, separates the semiregular and Mira variables, with the…
Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
Nardini, E.; Lusso, E.; Bisogni, S.
We report on the detection of a blueshifted Fe K absorption feature in two consecutive XMM-Newton observations of the luminous blue quasar Ton 28, at the 4σ cumulative significance. The rest energy of 9.2 keV implies the presence of an accretion disc wind with bulk outflow velocity of ∼0.28c, while the kinetic power is most likely a few per cent o…
The Time-domain Spectroscopic Survey: Radial Velocity Variability in Dwarf Carbon Stars
Roulston, Benjamin R.; Green, Paul J.; Anderson, Scott F. +6 more
Dwarf carbon (dC) stars (main-sequence stars showing carbon molecular bands) were initially thought to be an oxymoron because only asymptotic giant branch (AGB) stars dredge carbon into their atmospheres. Mass transfer from a former AGB companion that has since faded to a white dwarf seems the most likely explanation. Indeed, a few types of giants…
Formation of disc galaxies around z ∼ 2
Sachdeva, Sonali; Gogoi, Rupjyoti; Saha, Kanak +2 more
We present combined evolution of morphological and stellar properties of galaxies on the two sides of z = 2 (2.0 < z < 4.0 and 1.5 < z < 2.0) in CDFS, with ground-based spectroscopic redshifts. We perform bulge-disc decomposition on their images in J and H filters, from the 3DHST Legacy Survey obtained using HST/WFC3. Combining morphol…
Investigation of the globular cluster NGC 2808 with the Ultra-Violet Imaging Telescope
Vig, S.; Ghosh, S. K.; Jain, Rashi
Globular clusters represent stellar laboratories where observations can be used to validate models of stellar evolution. In this study, we put forth new ultraviolet (UV) photometric results of stars in the Galactic globular cluster NGC 2808. NGC 2808 is known to host multiple stellar populations that include at least four distinct groups of horizo…
Analysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surface
Mottola, S.; Naletto, G.; Vincent, J. -B. +26 more
On 2015 July 18, near perihelion at a heliocentric distance of 1.28 au, the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-M) on board the Rosetta spacecraft had the opportunity of observing dust activity in the inner coma with a view of the night side (shadowed side) of comet 67P/Churyumov-Gerasimenko. At the time of the measurements we pr…
Investigating the origin of the faint non-thermal emission of the Arches cluster using the 2015-2016 NuSTAR and XMM-Newton X-ray observations
Mori, Kaya; Zhang, Shuo; Tomsick, John +7 more
Recent NuSTAR and XMM-Newton observations of the molecular cloud around the Arches stellar cluster demonstrate a dramatic change both in morphology and intensity of its non-thermal X-ray emission, similar to that observed in many molecular clouds of the Central Molecular Zone at the Galactic Center. These variations trace the propagation of illumi…
On the Relation between Flare and CME during GLE-SEP and Non-GLE-SEP Events
Gan, W. Q.; Moon, Y. -J.; Rodríguez-Pacheco, J. +2 more
Association of solar flares and coronal mass ejections (CMEs) with ground-level enhancement (GLE) is a recognized fact, but questions arise when a similar association is observed for non-GLEs. In this respect, we carry out a detailed study of the relation between flare fluences (ϕ J m-2) and CME speeds (V cme km s-1
FUSE Spectroscopic Analysis of the Slowest Symbiotic Nova AG Peg During Quiescence
Sion, Edward M.; Godon, Patrick; Mikolajewska, Joanna +1 more
We present a far-UV (FUV) spectroscopic analysis of the slowest known symbiotic nova AG Peg that underwent a nova explosion in 1850 followed by a very slow decline that did not end until ∼1996, marking the beginning of quiescence. In 2015 June, when AG Peg exhibited a Z And-type outburst with an optical amplitude of ∼1.5 mag. We used accretion dis…