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XMMSL1J063045.9-603110: a tidal disruption event fallen into the back burner
Campana, Sergio; Mainetti, Deborah; Colpi, Monica
Black holes at the centre of quiescent galaxies can be switched on when they accrete gas that is gained from stellar tidal disruptions. A star approaching a black hole on a low angular momentum orbit may be ripped apart by tidal forces, which triggers raining down of a fraction of stellar debris onto the compact object through an accretion disc an…
A dispersive wave pattern on Jupiter's fastest retrograde jet at 20°S
Fletcher, L. N.; Orton, G. S.; Rogers, J. H. +3 more
A compact wave pattern has been identified on Jupiter's fastest retrograding jet at 20°S (the SEBs) on the southern edge of the South Equatorial Belt. The wave has been identified in both reflected sunlight from amateur observations between 2010 and 2015, thermal infrared imaging from the Very Large Telescope and near infrared imaging from the Inf…
Relationship between Distribution of Magnetic Decay Index and Filament Eruptions
Liu, Y.; Li, H.; Elmhamdi, A. +1 more
The decay index n of a horizontal magnetic field is considered to be an important parameter in judging the stability of a flux rope. However, the spatial distribution of this parameter has not been extensively explored so far. In this paper, we present a delineative study of the three-dimensional maps of n for two eruptive events, in which filamen…
Triple-ionized carbon associated with the low-density neutral hydrogen gas at 1.7 < z < 3.3: the integrated N H I-N C IV relation
Cristiani, S.; Carswell, R. F.; Kim, T. -S. +4 more
From the Voigt profile fitting analysis of 183 intervening {C IV} systems at 1.7 < z < 3.3 in 23 high-quality UVES/VLT and HIRES/Keck QSO spectra, we find that a majority of {C IV} systems (∼75 per cent) display a well-characterized scaling relation between integrated column densities of {H I} and {C IV} with a negligible redshift evolution,…
An investigation into potential causes of the anomalistic feature observed by the Rosetta Alice spectrograph around 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Stern, S. Alan; Noonan, John +6 more
The Alice far-ultraviolet spectrograph in operation around the comet 67P/Churyumov-Gerasimenko on the Rosetta spacecraft experiences an anomalistic feature (AF) that is ubiquitous at comet separations less than 450 km. This feature is highly temporally variable and displays no relation to any studied parameters with the exception of comet separati…
Comets at radio wavelengths
Bockelée-Morvan, Dominique; Biver, Nicolas; Crovisier, Jacques +1 more
Comets are considered as the most primitive objects in the Solar System. Their composition provides information on the composition of the primitive solar nebula, 4.6 Gyr ago. The radio domain is a privileged tool to study the composition of cometary ices. Observations of the OH radical at 18 cm wavelength allow us to measure the water production r…
Near-infrared observations of PSR J1357-6429
Mennickent, R. E.; Zharikov, S.; Kirichenko, A. +3 more
PSR J1357-6429 is a young radio pulsar that has been detected in the X-ray and γ-ray bands. We present high spatial resolution near-infrared imaging of the pulsar field in the J, H and Ks bands obtained using the VLT/NaCo with the Adaptive Optic system. We found a faint source at the most precise pulsar radio position, which we propose …
The Intermediate-mass Star-forming Region Lynds 1340. An Optical View
Moór, Attila; Kun, Mária; Reipurth, Bo +1 more
We have performed an optical spectroscopic and photometric search for young stellar objects associated with the molecular cloud Lynds 1340, and examined the structure of the cloud by constructing an extinction map, based on SDSS data. The new extinction map suggests a shallow, strongly fragmented cloud, having a mass of some 3700 M ⊙. L…
Saturn's aurora observed by the Cassini camera at visible wavelengths
Dyudina, Ulyana A.; Ingersoll, Andrew P.; Ewald, Shawn P. +1 more
The first observations of Saturn's visible-wavelength aurora were made by the Cassini camera. The aurora was observed between 2006 and 2013 in the northern and southern hemispheres. The color of the aurora changes from pink at a few hundred km above the horizon to purple at 1000-1500 km above the horizon. The spectrum observed in 9 filters spannin…
The causal sequence investigation of the ring current ion-flux increasing and the magnetotail ion injection during a major storm
Cao, JinBin; Li, Lu; McKenna-Lawlor, S. +2 more
Comprehensive records are available in ENA data of ring current activity recorded by the NUADU instrument aboard TC-2 on 15 May, 2005 during a major magnetic storm (which incorporated a series of substorms). Ion fluxes at 4-min temporal resolution derived from ENA data in the energy ranges 50-81 and 81-158 keV are compared with in situ particle fl…