Search Publications
The Identification of Extreme Asymptotic Giant Branch Stars and Red Supergiants in M33 With 24 µm Variability
Clayton, Geoffrey C.; Engelbracht, Charles W.; Srinivasan, Sundar +2 more
We present the first detection of 24 µm variability in 24 sources in the Local Group galaxy M33. These results are based on 4 epochs of Multiband Imaging Photometer for Spitzer observations, which are irregularly spaced over ∼ 750 days. We find that these sources are constrained exclusively to the Holmberg radius of the galaxy, which increas…
Deep Chandra observations of the NGC 4472 globular cluster black hole XMMU 122939.7+075333: short-term variability from the first globular cluster black hole binary
Maccarone, T. J.; Sivakoff, G. R.; Kraft, R. P. +1 more
In this paper, we discuss the luminosity modulations and spectral analysis results of the recent deep observations of XMMU 122939.7+075333, the first black hole discovered in a globular cluster. The source has been detected many times, typically with LX > 1039 erg s-1, but in a 2010 observation had faded to L
Intermittency of magnetic field turbulence: Astrophysical applications of in-situ observations
Zelenyi, Lev M.; Artemyev, Anton V.; Bykov, Andrei M. +1 more
We briefly review some aspects of magnetic turbulence intermittency observed in space plasmas. Deviation of statistical characteristics of a system (e.g. its high statistical momenta) from the Gaussian can manifest itself as domination of rare large intensity peaks often associated with the intermittency in the system's dynamics. Thirty years ago,…
Extremely Bright Submillimeter Galaxies beyond the Lupus-I Star-forming Region
Yun, M. S.; Wilner, D. J.; Shimajiri, Y. +25 more
We report detections of two candidate distant submillimeter galaxies (SMGs), MM J154506.4-344318 and MM J154132.7-350320, which are discovered in the AzTEC/ASTE 1.1 mm survey toward the Lupus-I star-forming region. The two objects have 1.1 mm flux densities of 43.9 and 27.1 mJy, and have Herschel/SPIRE counterparts as well. The Submillimeter Array…
Comment on "Magnetic phase structure of Saturn's 10.7 h oscillations" by Yates et al.
Andrews, D. J.; Cowley, S. W. H.; Provan, G.
The extreme ultraviolet spectrum of the kinetically dominated quasar 3C 270.1
Punsly, Brian; Marziani, Paola
Only a handful of quasars have been identified as kinetically dominated, their long-term time-averaged jet power, overline{Q}, exceeds the bolometric thermal emission, Lbol, associated with the accretion flow. This Letter presents the first extreme ultraviolet (EUV) spectrum of a kinetically dominated quasar, 3C 270.1. The EUV continuum…
Planetary science: Sink holes and dust jets on comet 67P
Weissman, Paul
Analyses of images taken by the Rosetta spacecraft reveal the complex landscape of a comet in rich detail. Close-up views of the surface indicate that some dust jets are being emitted from active pits undergoing sublimation. See Letter p.63
Preliminary empirical model of inner boundary of ion plasma sheet
Dandouras, I.; Cao, J. B.; Reme, H. +4 more
The penetration of the plasma sheet into the inner magnetosphere is important to both ring current formation and spacecraft charging at geosynchronous orbit. This paper, using hot ion data recorded by HIA of TC-1/DSP, establishes an empirical model of the inner boundary of ion plasma sheet (IBIPS) on the near equatorial plane. All IBIPS are locate…
The effects of solar flares, coronal mass ejections, and co-rotating interaction regions on the Venusian 5577 A oxygen green line
Gray, Candace
The Venusian 5577.3 A OI (1S - 1D) (oxygen green line) nightglow emission is known to be highly temporally variable. The reason for this variability is unknown. We propose that the emission is due to electron precipitation from intense solar storms. For my dissertation, I observed the Venusian green line after solar flares, coronal mass ejections …
Cluster observations of unusually high concentration of energetic O+ carried by flux ropes in the nightside high-latitude magnetosheath during a storm initial phase
Dandouras, I.; Reme, H.; Lui, A. T. Y. +6 more
We present measurements from Cluster spacecraft to investigate the energetic singly charged oxygen ions, O+, within the flux ropes in the nightside high-latitude magnetosheath during the initial phase of an intense storm on 24 October 2011. Three magnetic flux ropes were identified by Cluster 4 in the intervals from 20:10 UT to 20:20 UT…