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Hubble Space Telescope Imaging of the Expanding Nebular Remnant of the 2006 Outburst of the Recurrent Nova RS Ophiuchi
Bond, Howard E.; Eyres, S. P. S.; Evans, A. +5 more
We report Hubble Space Telescope imaging obtained 155 days after the 2006 outburst of RS Ophiuchi. We detect extended emission in both [O III] λ5007 and [Ne V] λ3426 lines. In both lines, the remnant has a double ring structure. The east-west orientation and total extent of these structures (580+/-50 AU at d=1.6 kpc) is consistent with that expect…
Elemental abundances of Galactic bulge planetary nebulae from optical recombination lines
Wang, W.; Liu, X. -W.
Deep long-slit optical spectrophotometric observations are presented for 25 Galactic bulge planetary nebulae (GBPNe) and six Galactic disc planetary nebulae (GDPNe). The spectra, combined with archival ultraviolet (UV) spectra obtained with the International Ultraviolet Explorer and infrared spectra obtained with the Infrared Space Observatory, ha…
Direct Observation of High-Speed Plasma Outflows Produced by Magnetic Reconnection in Solar Impulsive Events
Qiu, Jiong; Wang, Tongjiang; Sui, Linhui
Spectroscopic observations of a solar limb flare recorded by SUMER on SOHO reveal for the first time hot, fast magnetic reconnection outflows in the corona. As the reconnection site rises across the SUMER spectrometer slit, significant blue- and redshift signatures are observed in sequence in the Fe XIX line, reflecting upflows and downflows of ho…
MAGIC Upper Limits on the Very High Energy Emission from Gamma-Ray Bursts
Bastieri, D.; Ciprini, S.; Longo, F. +141 more
During its first data cycle, between 2005 and the beginning of 2006, the fast repositioning system of the MAGIC telescope allowed the observation of nine different gamma-ray bursts as possible sources of very high energy γ-rays. These observations were triggered by alerts from Swift, HETE-2, and INTEGRAL; they started as quickly as possible after …
Cassini imaging of Saturn's rings. II. A wavelet technique for analysis of density waves and other radial structure in the rings
Nicholson, Philip D.; Porco, Carolyn C.; Hedman, Matthew M. +2 more
We describe a powerful signal processing method, the continuous wavelet transform, and use it to analyze radial structure in Cassini ISS images of Saturn's rings. Wavelet analysis locally separates signal components in frequency space, causing many structures to become evident that are difficult to observe with the naked eye. Density waves, genera…
UV habitable zones around M stars
Buccino, Andrea P.; Lemarchand, Guillermo A.; Mauas, Pablo J. D.
During the last decade there was a change in paradigm, which led to consider that terrestrial-type planets within liquid-water habitable zones (LW-HZ) around M stars can also be suitable places for the emergence and evolution of life. Since many dMe stars emit large amount of UV radiation during flares, in this work we analyze the UV constrains fo…
A comparison of LBGs, DRGs, and BzK galaxies: their contribution to the stellar mass density in the GOODS-MUSIC sample
Pentericci, L.; Santini, P.; Fontana, A. +8 more
Context: The classification scheme for high redshift galaxies is complex at the present time, with simple colour-selection criteria (i.e. EROs, IEROs, LBGs, DRGs, BzKs), resulting in ill-defined properties for the stellar mass and star formation rate of these distant galaxies.
Aims: The goal of this work is to investigate the properties of dif…
An Increase in the Faint Red Galaxy Population in Massive Clusters since z ~ 0.5
Kneib, J. -P.; Smith, G. P.; Smail, Ian +4 more
We compare the luminosity functions for red galaxies lying on the rest-frame (U-V) color-magnitude sequence in a homogeneous sample of 10 X-ray-luminous clusters from the MACS survey at z~0.5 to a similarly selected X-ray cluster sample at z~0.1. We exploit deep Hubble Space Telescope ACS imaging in the F555W and F814W passbands of the central 1.2…
Comparison of the composition of the Tempel 1 ejecta to the dust in Comet C/Hale Bopp 1995 O1 and YSO HD 100546
Li, A.; Kraemer, K. E.; Lisse, C. M. +2 more
Spitzer Infrared Spectrograph observations of the Deep Impact experiment in July 2005 have created a new paradigm for understanding the infrared spectroscopy of primitive solar nebular (PSN) material—the ejecta spectrum is the most detailed ever observed in cometary material. Here we take the composition model for the material excavated from Comet…
Mapping Extremely Low Metallicity Galaxies to Redshift One
Cowie, Lennox L.; Hu, Esther M.; Kakazu, Yuko
We describe the results of a narrowband search for ultrastrong emission line galaxies (USELs) with EW(Hβ)>=30 Å. A total of 542 candidate galaxies are found in a one-half square degree survey using two ~120 Å filters centered at 8150 and 9140 Å with Subaru SuprimeCam. Follow-up spectroscopy for randomly selected objects in the candidate sample …