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Local dark energy: HST evidence from the vicinity of the M81/M82 galaxy group
Karachentsev, I. D.; Kashibadze, O. G.; Makarov, D. I. +5 more
The Hubble Space Telescope observations of the nearby galaxy group M81/M82 and its vicinity indicate that the dynamics of the expansion outflow around the group is dominated by the antigravity of the dark energy background. The local density of dark energy in the area is estimated to be near the global dark energy density or perhaps exactly equal …
Photometric Selection of QSO Candidates from GALEX Sources
Gould, Andrew; Atlee, David W.
We present a catalog of 36,120 QSO candidates from the Galaxy Evolution Explorer (GALEX) Release Two (GR2) UV catalog and the USNO-A2.0 optical catalog. The selection criteria are established using known quasars from the Sloan Digital Sky Survey (SDSS). The SDSS sample is then used to assign individual probabilities to our GALEX USNO candidates. T…
Large-scale structure of the fast solar wind
Breen, A. R.; Bisi, M. M.; Fallows, R. A. +2 more
We present the results of a comprehensive study of the fast solar wind near solar minimum conditions using interplanetary scintillation (IPS) data taken with the EISCAT system in northern Scandinavia, and a recent extremely long baseline observation using both EISCAT and MERLIN systems. The results from IPS observations suggest that the fast wind …
The interaction of a plasmoid with a loop-top kernel
Kołomański, S.; Karlický, M.
Aims:We study the interaction between a downward moving plasmoid and a loop-top kernel recognized in the 30 November 2000 flare. Such an interaction is predicted by some numerical models of solar flares.
Methods: Using X-ray observations from Yohkoh and GOES, EUV observations from SOHO, and radio observations from Ondřejov, we perform multi-wa…
Statistics of low-frequency variations in solar wind, foreshock and magnetosheath: INTERBALL-1 and CLUSTER data
Du, J.; Shevyrev, N. N.; Zastenker, G. N.
The properties of small-scale ion flux and magnetic field fluctuations in the regions of undisturbed solar wind, foreshock and magnetosheath have been investigated. The systematic measurements of these parameters with very high time resolution, which were obtained onboard INTERBALL-1 spacecraft during 1996 2000, make it possible to examine their v…
AEGIS: Infrared Spectroscopy of an Infrared-luminous Lyman Break Galaxy at z=3.01
Le Floc'h, E.; Barmby, P.; Papovich, C. +16 more
We report the detection of rest-frame 6.2 and 7.7 µm emission features arising from polycyclic aromatic hydrocarbons (PAHs) in the Spitzer IRS spectrum of an infrared-luminous Lyman break galaxy at z=3.01. This is currently the highest redshift galaxy where these PAH emission features have been detected. The total IR luminosity inferred from…
The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster
Ferguson, Henry C.; Williams, Benjamin F.; Gerhard, Ortwin +11 more
We report on the discovery of a faint (MV~-10.6+/-0.2) dwarf spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field. The galaxy is easily resolved in our images, as our color magnitude diagram (CMD) extends >~1 magnitude beyond the tip of the red giant branch (RGB). Thus, it is the deepe…
Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku
Kelley, Richard L.; Hughes, John P.; Ohashi, Takaya +12 more
We searched for redshifted O emission lines from a possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the X-ray Imaging Spectrometer (XIS) instrument on Suzaku. This cluster is thought to have an elongated structure along the line of sight based on previous studies. We studied systematic uncer…
Nondetection of Titan lightning radio emissions with Cassini/RPWS after 35 close Titan flybys
Gurnett, D. A.; Kurth, W. S.; Fischer, G. +3 more
We report on the nondetection of radio emissions associated with possible lightning flashes in Titan's atmosphere by the Cassini/RPWS (Radio and Plasma Wave Science) instrument. A valid proof for Titan lightning would be the detection of a number of bursty radio signals above Titan's ionospheric cutoff frequency, and they should be grouped near th…
Fine Structure of Solar Radio Bursts Observed at Decametric and Hectometric Waves
Kaiser, M. L.; Bougeret, J. -L.; Chernov, G. P. +2 more
The analysis of WIND/WAVES RAD2 spectra with fine structure in the form of different fibers in 14 events covering 1997 - 2005 is carried out. A splitting of broad bands of the interplanetary (IP) type II bursts into narrow band fibers of different duration is observed. The instantaneous-frequency bandwidth of fibers is stable: 200 - 300 kHz for sl…