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Gamma-ray burst observations by Fermi Large Area Telescope revisited: new candidates found
Pshirkov, M. S.; Rubtsov, G. I.; Tinyakov, P. G.
We search the Fermi Large Area Telescope (LAT) photon data base for an extended gamma-ray emission which could be associated with any of the 581 previously detected gamma-ray bursts (GRBs) visible to the Fermi-LAT. For this purpose, we compare the number of photons with energies E > 100 MeV and E > 1 GeV which arrived in the first 1500 s aft…
Cases and statistical study on Hot Flow Anomalies with Cluster spacecraft data
Zhang, H.; Wang, S.; Zong, Q. G.
Observations from SDO, Hinode, and STEREO of a Twisting and Writhing Start to a Solar-filament-eruption Cascade
Hara, Hirohisa; Moore, Ronald L.; Sterling, Alphonse C.
We analyze data from SDO (AIA, HMI), Hinode (SOT, XRT, EIS), and STEREO (EUVI) of a solar eruption sequence of 2011 June 1 near 16:00 UT, with an emphasis on the early evolution toward eruption. Ultimately, the sequence consisted of three emission bursts and two filament ejections. SDO/AIA 304 Å images show absorbing-material strands initially in …
Hot Diffuse Emission in the Nuclear Starburst Region of NGC 2903
Soria, Roberto; Tennant, Allyn F.; Swartz, Douglas A. +2 more
We present a deep Chandra observation of the central regions of the late-type barred spiral galaxy NGC 2903. The Chandra data reveal soft (kTe ~ 0.2-0.5 keV) diffuse emission in the nuclear starburst region and extending ~2' (~5 kpc) to the north and west of the nucleus. Much of this soft hot gas is likely to be from local active star-f…
A Method of Identifying AGNs Based on Emission-Line Excess and the Nature of Low-Luminosity AGNs in the Sloan Digital Sky Survey. I. A New Method
Tanaka, Masayuki
We developed a new technique for identifying active galactic nuclei (AGNs) and studied the nature of low-luminosity AGNs in the Sloan Digital Sky Survey. This is the former part of a series of papers. We develop a new, sensitive method of identifying AGNs in this paper. The emission-line luminosity in a spectrum is the sum of a star-formation comp…
Limb Darkening study using Venus nightside infrared spectra from VIRTIS-Venus Express data
Drossart, Pierre; Longobardo, Andrea; Palomba, Ernesto +3 more
The Limb Darkening (LD) effect consists in an attenuation of the measured radiance at increasing emergence angles, due to the larger portion of the atmosphere traversed by the radiation observed at higher emergence angles. The behaviour of radiance emerging with atmosphere as function of the emergence angle (i.e., the Limb Darkening Function) is r…
Optical and infrared imaging and spectroscopy of the multiple-shell planetary nebula NGC 6369
Guerrero, M. A.; Ramos-Larios, G.; Phillips, J. P. +1 more
NGC 6369 is a double-shell planetary nebula consisting of a bright annular inner shell with faint bipolar extensions and a filamentary envelope. We have used ground- and space-based narrow-band optical and near-infrared (near-IR) images, broad-band mid-IR images, optical long-slit echelle spectra and mid-IR spectra to investigate its physical stru…
Two New Bursting Neutron Star Low-mass X-Ray Binaries: Swift J185003.2-005627 and Swift J1922.7-1716
Altamirano, D.; Degenaar, N.; Wijnands, R. +1 more
We discuss the origin of two triggers of Swift's Burst Alert Telescope (BAT) that occurred in 2011. The triggers were identified with Swift J185003.2-005627, a previously unknown X-ray source, and the known but unclassified X-ray transient Swift J1922.7-1716. We investigate the BAT data and follow-up observations obtained with Swift's X-ray and ul…
The light curve of asteroid 21 Lutetia measured by VIRTIS-M during the Rosetta fly-by
Erard, S.; Capaccioni, F.; Coradini, A. +7 more
On 10 July 2010, the Rosetta spacecraft encountered the asteroid 21 Lutetia on its way to the comet 67P/Churyumov-Gerasimenko. This was the second of two planned asteroid fly-bys performed by the probe, the first fly-by being with the much smaller asteroid 2867 Steins in September 2008. The VIRTIS imaging spectrometer (angular resolution 0.250 mra…
Hydrated minerals in the deposits of Aureum Chaos
Neukum, G.; McGuire, P. C.; Sowe, M. +1 more
Hydrated minerals have been detected in many martian chaos regions and chasmata, playing a major role in its past aqueous activity. Based on short wave infrared data from CRISM, imagery and elevation data, we identified and mapped hydrated minerals in Aureum Chaos to shed light on their stratigraphy and geological context.
The Interior Layere…