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Multi-wavelength properties of IGR J05007-7047 (LXP 38.55) and identification as a Be X-ray binary pulsar in the LMC
Haberl, F.; Udalski, A.; Sturm, R. +2 more
We report on the results of a ∼40-d multi-wavelength monitoring of the Be X-ray binary system IGR J05007-7047 (LXP 38.55). During that period the system was monitored in the X-rays using the Swift telescope and in the optical with multiple instruments. When the X-ray luminosity exceeded 1036 erg s-1 we triggered an XMM-Newton…
Coalescence of magnetic flux ropes observed in the tailward high-speed flows
Zhao, Yan; Yao, Zhonghua; Lu, Quanming +3 more
We report a tailward high-speed flow event observed by Cluster during 0203:00UT-0205:30UT on 20 September 2003. Within the flows, a series of three bipolar Bz signatures were observed. The first and third bipolar Bz signatures are identified as magnetic flux ropes, while the middle one is found to result from the collision of…
Constraints on the H2O formation mechanism in the wind of carbon-rich AGB stars
Blommaert, J. A. D. L.; De Ridder, J.; de Koter, A. +13 more
Context. The recent detection of warm H2O vapor emission from the outflows of carbon-rich asymptotic giant branch (AGB) stars challenges the current understanding of circumstellar chemistry. Two mechanisms have been invoked to explain warm H2O vapor formation. In the first, periodic shocks passing through the medium immediate…
The size and shape of the Milky Way disc and halo from M-type brown dwarfs in the BoRG survey
Trenti, M.; Bouwens, R. J.; Holwerda, B. W. +3 more
We have identified 274 M-type brown dwarfs in the Hubble Space Telescope's Wide Field Camera 3 pure parallel fields from the Brightest of Reionizing Galaxies (BoRG) survey for high-redshift galaxies. These are near-infrared observations with multiple lines of sight out of our Milky Way. Using these observed M-type brown dwarfs, we fitted a Galacti…
The Secret Lives of Cepheids: Evolution, Mass-Loss, and Ultraviolet Emission of the Long-period Classical Cepheid
Guinan, Edward F.; Engle, Scott G.; Neilson, Hilding R. +2 more
The classical Cepheid l Carinae is an essential calibrator of the Cepheid Leavitt Law as a rare long-period Galactic Cepheid. Understanding the properties of this star will also constrain the physics and evolution of massive (M ≥ 8 M ⊙) Cepheids. The challenge, however, is precisely measuring the star's pulsation period and its rate of …
Flux and spectral variability of the blazar PKS 2155 -304 with XMM-Newton: Evidence of particle acceleration and synchrotron cooling
Bhagwan, Jai; Papadakis, I. E.; Wiita, Paul J. +1 more
We have analyzed XMM-Newton observations of the high energy peaked blazar, PKS 2155 -304, made on 24 May 2002 in the 0.3-10 keV X-ray band. These observations display a mini-flare, a nearly constant flux period and a strong flux increase. We performed a time-resolved spectral study of the data, by dividing the data into eight segments. We fitted t…
Hybrid simulation of Titan's interaction with the supersonic solar wind during Cassini's T96 flyby
Simon, Sven; Motschmann, Uwe; Neubauer, Fritz M. +5 more
By applying a hybrid (kinetic ions and fluid electrons) simulation code, we study the plasma environment of Saturn's largest moon Titan during Cassini's T96 flyby on 1 December 2013. The T96 encounter marks the only observed event of the entire Cassini mission where Titan was located in the supersonic solar wind in front of Saturn's bow shock. Our…
Source region and growth analysis of narrowband Z-mode emission at Saturn
Gurnett, D. A.; Coates, A. J.; Santolík, O. +5 more
Intense Z-mode emission is observed in the lower density region near the inner edge of the Enceladus torus at Saturn, where these waves may resonate with MeV electrons. The source mechanism of this emission, which is narrow-banded and most intense near 5 kHz, is not well understood. We survey the Cassini Radio and Plasma Wave Science data to isola…
Shadowing and anisotropy of solar energetic ions at Mars measured by MAVEN during the March 2015 solar storm
Lee, Christina O.; Larson, Davin; Halekas, Jasper S. +4 more
The Solar Energetic Particle (SEP) Instrument on the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft is meant to characterize the variability of SEP fluxes at Mars. SEP ion precipitation is an important source of heating, ionization, and chemical changes in the upper atmosphere of Mars and may have played a substantial role in driving at…
A Chandra Study of Temperature Distributions of the Intracluster Medium in 50 Galaxy Clusters
Hu, Dan; Xu, Haiguang; Zhu, Zhenghao +10 more
To investigate the spatial distribution of the intracluster medium temperature in galaxy clusters in a quantitative way and probe the physics behind it, we analyze the X-ray spectra from a sample of 50 clusters that were observed with the Chandra ACIS instrument over the past 15 years and measure the radial temperature profiles out to 0.45r50…