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The X-ray view of merger-induced active galactic nuclei activity at low redshift
Ellison, Sara L.; Blecha, Laura; Satyapal, Shobita +1 more
Galaxy mergers are predicted to trigger accretion on to the central supermassive black holes, with the highest rates occurring during final coalescence. Previously, we have shown elevated rates of both optical and mid-IR selected active galactic nuclei (AGNs) in post-mergers, but to date the prevalence of X-ray AGNs has not been examined in the sa…
X-ray spectroscopy of the γ-ray brightest nova V906 Car (ASASSN-18fv)
Strader, Jay; Chomiuk, Laura; Ness, Jan-Uwe +15 more
Shocks in γ-ray emitting classical novae are expected to produce bright thermal and non-thermal X-rays. We test this prediction with simultaneous NuSTAR and Fermi/LAT observations of nova V906 Car, which exhibited the brightest GeV γ-ray emission to date. The nova is detected in hard X-rays while it is still γ-ray bright, but contrary to simple th…
The slow demise of the long-lived SN 2005ip
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kilpatrick, Charles D. +16 more
The Type IIn supernova (SN IIn) 2005ip is one of the most well-studied and long-lasting examples of an SN interacting with its circumstellar environment. The optical light curve plateaued at a nearly constant level for more than five years, suggesting ongoing shock interaction with an extended and clumpy circumstellar medium (CSM). Here, we presen…
The Gemini Planet Imager View of the HD 32297 Debris Disk
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +61 more
We present new H-band scattered light images of the HD 32297 edge-on debris disk obtained with the Gemini Planet Imager. The disk is detected in total and polarized intensity down to a projected angular separation of 0"15, or 20 au. On the other hand, the large-scale swept-back halo remains undetected, likely a consequence of its markedly blue col…
Exploring the differences of integrated and spatially resolved analysis using integral field unit data: the case of Abell 14
Akras, Stavros; Monteiro, Hektor; Aleman, Isabel +3 more
We present a new approach to study planetary nebulae using integral field spectroscopy. VLT@VIMOS datacube of the planetary nebula Abell 14 is analysed in three different ways by extracting: (I) the integrated spectrum, (II) one-dimensional simulated long-slit spectra for different position angles, and (III) spaxel-by-spaxel spectra. These data ar…
Effects of Fluctuating Magnetic Field on the Growth of the Kelvin-Helmholtz Instability at the Earth's Magnetopause
Hasegawa, H.; Nakamura, R.; Narita, Y. +5 more
At the Earth's magnetopause, the Kelvin-Helmholtz (KH) instability, driven by the persistent velocity shear between the magnetosheath and the magnetosphere, has been frequently observed during northward interplanetary magnetic field periods and considered as one of the most important candidates for transporting and mixing plasmas across the magnet…
Is NGC 5824 the Core of the Progenitor of the Cetus Stream?
Zhao, Gang; Zhao, Jing-Kun; Kang, Xi +5 more
The complicated story of the Cetus Stream (CS) is recently revealed by its newly discovered ∼150 members with 6D kinematics from the cross-matched catalog of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5 K giants and Gaia DR2. It exhibits a very diffuse structure at heliocentric distances between 20 and 50 kpc, extendi…
Hypervelocity stars in the Gaia era. Revisiting the most extreme stars from the MMT HVS survey
Heber, U.; Irrgang, A.; Kreuzer, S.
The hypervelocity star (HVS) survey conducted at the Multiple Mirror Telescope (MMT) identified 42 B-type stars in the Galactic halo whose radial velocity in the Galactic rest-frame exceeds +275 km s-1. In order to unravel the nature and origin of those high-velocity outliers, their complete six-dimensional phase space information is ne…
Colour and tropospheric cloud structure of Jupiter from MUSE/VLT: Retrieving a universal chromophore
Fletcher, Leigh N.; Irwin, Patrick G. J.; Orton, Glenn S. +1 more
Recent work by Sromovsky et al. (2017) suggested that all red colour in Jupiter's atmosphere could be explained by a single colour-carrying compound, a so-called 'universal chromophore'. We tested this hypothesis on ground-based spectroscopic observations in the visible and near-infrared (480-930 nm) from the VLT/MUSE instrument between 2014 and 2…
A complete catalogue of dusty supernova remnants in the Galactic plane
De Looze, I.; Rho, J.; Dunne, L. +9 more
We search for far-infrared (FIR) counterparts of known supernova remnants (SNRs) in the Galactic plane (360° in longitude and $b = \pm \, 1^{\circ }$ ) at 70-500 µm with Herschel. We detect dust signatures in 39 SNRs out of 190, made up of 13 core-collapse supernovae (CCSNe), including 4 Pulsar Wind Nebulae (PWNe), and 2 Type Ia SNe. A furth…