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Massive stars dying alone: the extremely remote environment of SN 2009ip
Smith, Nathan; Andrews, Jennifer E.; Mauerhan, Jon C.
We present late-time Hubble Space Telescope (HST) images of the site of supernova (SN) 2009ip taken almost 3 yr after its bright 2012 luminosity peak. SN 2009ip is now slightly fainter in broad filters than the progenitor candidate detected by HST in 1999. The current source continues to be dominated by ongoing late-time circumstellar material int…
The Reverberation Lag in the Low-mass X-ray Binary H1743-322
Ponti, Gabriele; De Marco, Barbara
The evolution of the inner accretion flow of a black hole X-ray binary during an outburst is still a matter of active research. X-ray reverberation lags are powerful tools for constraining disk-corona geometry. We present a study of X-ray lags in the black hole transient H1743-322. We compared the results obtained from analysis of all the publicly…
The MUSE view of QSO PG 1307+085: an elliptical galaxy on the MBH-σ* relation interacting with its group environment
Scharwächter, J.; Husemann, B.; Bennert, V. N. +2 more
We report deep optical integral-field spectroscopy with the Multi-Unit Spectroscopic Explorer (MUSE) at the Very Large Telescope of the luminous radio-quiet quasi-stellar object (QSO) PG 1307+085 obtained during commissioning. Given the high sensitivity and spatial resolution delivered by MUSE, we are able to resolve the compact (re ∼ 1…
Radical-induced chemistry from VUV photolysis of interstellar ice analogues containing formaldehyde
Danger, Grégoire; Chiavassa, Thierry; Duvernay, Fabrice +1 more
Surface processes and radical chemistry within interstellar ices are increasingly suspected to play an important role in the formation of complex organic molecules (COMs) observed in several astrophysical regions and cometary environments. We present new laboratory experiments on the low-temperature solid state formation of complex organic molecul…
OGLE Study of the Sagittarius Dwarf Spheroidal Galaxy and its M54 Globular Cluster
Soszyński, I.; Udalski, A.; Szymański, M. K. +9 more
We use the fundamental-mode RR Lyr-type variable stars (RRab) from OGLE-IV survey to draw a 3D picture of the central part of the tidally disrupted Sagittarius Dwarf Spheroidal (Sgr dSph) galaxy. We estimate the line-of-sight thickness of the Sgr dSph stream to be FWHMcen=2.42 kpc. Based on OGLE-IV observations collected in seasons 2011…
Imprints of a high-velocity wind on the soft X-ray spectrum of PG1211+143
Vaughan, S.; Reeves, J. N.; Pounds, K. A. +2 more
An extended XMM-Newton observation of the luminous narrow-line Seyfert galaxy PG1211+143 in 2014 has revealed a more complex high-velocity wind, with components distinguished in velocity, ionization level, and column density. Here we report soft X-ray emission and absorption features from the ionized outflow, finding counterparts of both high-velo…
Deciphering the embedded wave in Saturn's Maxwell ringlet
Nicholson, Philip D.; French, Richard G.; McGhee-French, Colleen A. +5 more
The eccentric Maxwell ringlet in Saturn's C ring is home to a prominent wavelike structure that varies strongly and systematically with true anomaly, as revealed by nearly a decade of high-SNR Cassini occultation observations. Using a simple linear "accordion" model to compensate for the compression and expansion of the ringlet and the wave, we de…
Two Eclipsing Ultraluminous X-Ray Sources in M51
Soria, R.; Urquhart, R.
We present the discovery, from archival Chandra and XMM-Newton data, of X-ray eclipses in two ultraluminous X-ray sources (ULXs), located in the same region of the galaxy M51: CXOM51 J132940.0+471237 (ULX-1, for simplicity) and CXOM51 J132939.5+471244 (ULX-2). Three eclipses were detected for ULX-1 and two for ULX-2. The presence of eclipses puts …
Effects of the crustal magnetic fields on the Martian atmospheric ion escape rate
Barabash, Stas; Nilsson, Hans; Holmström, Mats +2 more
Eight years (2007-2015) of ion flux measurements from Mars Express are used to statistically investigate the influence of the Martian magnetic crustal fields on the atmospheric ion escape rate. We combine all Analyzer of Space Plasmas and Energetic Atoms/Ion Mass Analyzer (ASPERA-3/IMA) measurements taken during nominal upstream solar wind and sol…
Magnetic reconnection in Saturn's magnetotail: A comprehensive magnetic field survey
Thomsen, M. F.; Jackman, C. M.; Smith, A. W.
Reconnection within planetary magnetotails is responsible for locally energizing particles and changing the magnetic topology. Its role in terms of global magnetospheric dynamics can involve changing the mass and flux content of the magnetosphere. We have identified reconnection related events in spacecraft magnetometer data recorded during Cassin…