Search Publications
Saturn's tropospheric composition and clouds from Cassini/VIMS 4.6-5.1 µm nightside spectroscopy
Fletcher, Leigh N.; Baines, Kevin H.; Irwin, Patrick G. J. +5 more
The latitudinal variation of Saturn's tropospheric composition (NH 3, PH 3 and AsH 3) and aerosol properties (cloud altitudes and opacities) are derived from Cassini/VIMS 4.6-5.1 µm thermal emission spectroscopy on the planet's nightside (April 22, 2006). The gaseous and aerosol distributions are used to trac…
Analyzing low signal-to-noise FUSE spectra. Confirmation of Lyman continuum escape from Haro 11
Piskunov, N.; Leitet, E.; Bergvall, N. +1 more
Context. Galaxies are believed to be the main providers of Lyman continuum (LyC) photons during the early phases of the cosmic reionization. Little is known however, when it comes to escape fractions and the mechanisms behind the leakage. To learn more, one may look at local objects, but so far only one low-z galaxy has shown any signs of emitting…
A THEMIS survey of flux ropes and traveling compression regions: Location of the near-Earth reconnection site during solar minimum
Imber, S. M.; Angelopoulos, V.; Slavin, J. A. +1 more
A statistical study of flux ropes and traveling compression regions (TCRs) during the Time History of Events and Macroscale Interactions during Substorms second tail season has been performed. A combined total of 135 flux ropes and TCRs in the range GSM X ∼ -14 to -31 RE were identified, many of these occurring in series of two or more …
Sub-arcsecond [Fe ii] spectro-imaging of the DG Tauri jet. Periodic bubbles and a dusty disk wind?
Dougados, C.; Cabrit, S.; Agra-Amboage, V. +1 more
Context. The origin of protostellar jets as well as their impact on the regulation of angular momentum and the inner disk physics are still crucial open questions in star formation.
Aims: We aim to test the different proposed ejection processes in T Tauri stars through high-angular resolution observations of forbidden-line emission from the i…
A Combined Low-radio Frequency/X-ray Study of Galaxy Groups. I. Giant Metrewave Radio Telescope Observations at 235 MHz AND 610 MHz
Raychaudhury, Somak; Jones, Christine; Clarke, Tracy E. +12 more
We present new Giant Metrewave Radio Telescope observations at 235 MHz and 610 MHz of 18 X-ray bright galaxy groups. These observations are part of an extended project, presented here and in future papers, which combines low-frequency radio and X-ray data to investigate the interaction between central active galactic nuclei (AGNs) and the intra-gr…
Rosetta-Alice observations of exospheric hydrogen and oxygen on Mars
Parker, Joel Wm.; Bertaux, Jean-Loup; Weaver, Harold A. +9 more
The European Space Agency's Rosetta spacecraft, en route to a 2014 encounter with comet 67P/Churyumov-Gerasimenko, made a gravity assist swing-by of Mars on 25 February 2007, closest approach being at 01:54 UT. The Alice instrument on board Rosetta, a lightweight far-ultraviolet imaging spectrograph optimized for in situ cometary spectroscopy in t…
Discovery of a possibly old galaxy at z= 6.027, multiply imaged by the massive cluster Abell 383
Richard, Johan; Stark, Daniel P.; Kneib, Jean-Paul +3 more
We report the discovery of a unique z= 6.027 galaxy, multiply imaged by the cluster Abell 383 and detected in new Hubble Space Telescope ACS and WFC3 imaging, as well as in Warm Spitzer observations. This galaxy was selected as a pair of i-dropouts; its suspected high redshift was confirmed by the measurement of a strong Lyman α line in both image…
A Comparative Study of Confined and Eruptive Flares in NOAA AR 10720
Cheng, X.; Ding, M. D.; Zhang, J. +2 more
We investigate the distinct properties of two types of flares: eruptive flares associated with coronal mass ejections (CMEs) and confined flares without CMEs. Our study sample includes nine M- and X-class flares, all from the same active region (AR), six of which are confined and three others which are eruptive. The confined flares tend to be more…
Variations in the Axisymmetric Transport of Magnetic Elements on the Sun: 1996-2010
Hathaway, David H.; Rightmire, Lisa
We measure the axisymmetric transport of magnetic flux on the Sun by cross-correlating narrow strips of data from line-of-sight magnetograms obtained at a 96 minute cadence by the MDI instrument on the ESA/NASA SOHO spacecraft and then averaging the flow measurements over each synodic rotation of the Sun. Our measurements indicate that the axisymm…
The X-ray luminous galaxy cluster XMMU J1007.4+1237 at z = 1.56. The dawn of starburst activity in cluster cores
Böhringer, H.; Pratt, G. W.; Rosati, P. +12 more
Context. Observational galaxy cluster studies at z > 1.5 probe the formation of the first massive M > 1014 M⊙ dark matter halos, the early thermal history of the hot ICM, and the emergence of the red-sequence population of quenched early-type galaxies.
Aims: We present first results for the newly discovered X-ray l…