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Particle deposition on the saturnian satellites from ephemeral cryovolcanism on Enceladus
Showman, Adam P.; Hirata, Naoyuki; Miyamoto, Hideaki
The geologically active south pole of Enceladus generates a plume of micron-sized particles, which likely form Saturn's tenuous E-ring extending from the orbit of Mimas to Titan. Interactions between these particles and satellites have been suggested, though only as very thin surficial phenomena. We scrutinize high-resolution images with a newly d…
A photodissociation region study of NGC 4038
Barlow, M. J.; Bell, T. A.; Viti, S. +3 more
We present a model of the photodissociation regions of NGC 4038, which is part of the Antennae galaxies. We have considered one-dimensional slabs of uniform density, all having a maximum AV = 10 mag, interacting with plane-parallel radiation. The density range in our simulations spans four orders of magnitude (100 ≤ n ≤ 106 c…
Gravity waves in Titan's lower stratosphere from Huygens probe in situ temperature measurements
Young, Leslie A.; Lorenz, Ralph D.; Ferri, Francesca
The Huygens probe recorded atmospheric temperatures during its parachute descent through the atmosphere of Titan. A careful analysis of these data reveals for the first time spectacular but hitherto-unreported small-scale variations in stratospheric temperatures that we interpret as gravity waves, consistent with detection of such waves at higher …
The X-ray properties of the cometary blue compact dwarf galaxies Mrk 59 and Mrk 71
Bauer, F. E.; Thuan, T. X.; Izotov, Y. I.
We present XMM-Newton and Chandra observations of two low-metallicity cometary blue compact dwarf (BCD) galaxies, Mrk 59 and Mrk 71. The first BCD, Mrk 59, contains two ultraluminous X-ray sources (ULXs), IXO 72 and IXO 73, both associated with bright massive stars and H II complexes, as well as one fainter extended source associated with a massiv…
A comparison between VEGA 1, 2 and Giotto flybys of comet 1P/Halley: implications for Rosetta
Glassmeier, K. -H.; Volwerk, M.; Richter, I. +4 more
Three flybys of comet 1P/Halley, by VEGA 1, 2 and Giotto, are investigated with respect to the occurrence of mirror mode waves in the cometosheath and field line draping in the magnetic pile-up region around the nucleus. The time interval covered by these flybys is approximately 8 days, which is also the approximate length of an orbit or flyby of …
A Seyfert-2-like Spectrum in the High-mass X-Ray Binary Microquasar V4641 Sgr
Miller, Jon M.; Reynolds, M. T.; Maitra, Dipankar +1 more
We present an analysis of three archival Chandra observations of the black hole V4641 Sgr, performed during a decline into quiescence. The last two observations in the sequence can be modeled with a simple power law. The first spectrum, however, is remarkably similar to spectra observed in Seyfert-2 active galactic nuclei, which arise through a co…
Extended warm gas in the ULIRG Mrk273: Galactic outflows and tidal debris
Veilleux, S.; Rupke, D. S. N.; Sparks, W. B. +6 more
We present new HST/ACS medium- and narrow-band images and optical Isaac Newton Telescope long-slit spectra of the merging system Mrk273. The HST observations sample the [OIII]λλ4959,5007 emission from the galaxy and the nearby continuum. These data were taken as a part of a larger study of ultraluminous infrared galaxies (ULIRGs) with the aim of i…
HESS J1818-154, a new composite supernova remnant discovered in TeV gamma rays and X-rays
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +217 more
Composite supernova remnants (SNRs) constitute a small subclass of the remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-like shock front and from a pulsar wind nebula (PWN) located inside of the SNR. These systems represent a unique evolutionary phase of SNRs where observations in the rad…
Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay
Belloni, T.; Tomsick, J. A.; Wilms, J. +12 more
We characterized the broad-band X-ray spectra of Swift J1745-26 during the decay of the 2013 outburst using INTEGRAL ISGRI, JEM-X and Swift XRT. The X-ray evolution is compared to the evolution in optical and radio. We fit the X-ray spectra with phenomenological and Comptonization models. We discuss possible scenarios for the physical origin of an…
The energy source and dynamics of infrared luminous galaxy ESO 148-IG002
Kewley, Lisa J.; Dopita, Michael A.; Rich, Jeffrey A. +1 more
ESO 148-IG002 represents a transformative stage of galaxy evolution, containing two galaxies at close separation which are currently coalescing into a single galaxy. We present integral field data of this galaxy from the ANU Wide Field Spectrograph. We analyse our integral field data using optical line ratio maps and velocity maps. We apply active…