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Ultraviolet Spectroscopy of HD 44179
Sitko, Michael L.; Bernstein, Lawrence S.; Glinski, Robert J.
We have reanalyzed the ultraviolet spectrum of HD 44179, the central star(s) of the Red Rectangle Nebula, providing improved estimates of the column density, rotational, and vibrational temperatures of the 4th Positive A-X system of CO in absorption. The flux shortward of 2200 Å is a complex blend of CO features with no discernible stellar photosp…
May Day! Coronal Loop Temperatures from the Hinode EUV Imaging Spectrometer
Schmelz, J. T.; Scott, J.; Rightmire, L. A.
Data from the EUV Imaging Spectrometer on Hinode taken on 2007 May 1 (May Day) are used to investigate the thermal properties of a coronal loop in AR 10953. For background subtraction, we have taken cuts across the loop near the apex and the footpoint where the background is relatively simple. Three density-sensitive line ratios give statistically…
Detection of blueshifted emission and absorption and a relativistic iron line in the X-ray spectrum of ESO323-G077
Bianchi, S.; Schartel, N.; Santos-Lleó, M. +4 more
We report on the X-ray observation of the Seyfert 1 galaxy ESO323-G077 performed with XMM-Newton. The EPIC spectra show a complex spectrum with conspicuous absorption and emission features. The continuum emission can be modelled with a power law with an index of 1.99 +/- 0.02 in the whole XMM-Newton energy band, marginally consistent with typical …
A Survey of 3.3 µm PAH Emission in Planetary Nebulae
McLean, Ian S.; Smith, Erin C. D.
Results are presented from a pilot survey of 3.3 µm PAH emission from planetary nebulae using FLITECAM, an instrument intended for airborne astronomy with SOFIA. The observations were made during ground-based commissioning of FLITECAM's spectroscopic mode at the 3 m Shane Telescope at Lick Observatory. Direct-ruled KRS-5 grisms were used to …
Fourier-resolved energy spectra of the Narrow-Line Seyfert 1 Mkn 766
Papadakis, I. E.; Turner, T. J.; Arévalo, P. +4 more
We compute Fourier-resolved X-ray spectra of the Seyfert 1 Markarian 766 to study the shape of the variable components contributing to the 0.3-10 keV energy spectrum and their time-scale dependence. The fractional variability spectra peak at 1-3 keV, as in other Seyfert 1 galaxies, consistent with either a constant contribution from a soft excess …
The microbial case for Mars and its implication for human expeditions to Mars
Horneck, Gerda
Mars is considered as key target for the search of life beyond the Earth. As well as carbon based chemistry and an adequate energy source, water in liquid phase has been considered a prerequisite for habitability. By analogy with terrestrial extremophilic microbial communities, e.g., those thriving in arid, cold, salty environments and/or those ex…
On properties of radio-rich coronal mass ejections
Mittal, Nishant; Sharma, Joginder; Tomar, Vivek +1 more
We have studied properties of the radio-rich coronal mass ejections (CMEs) (observed during 1997–2006) which produce type II (1–14 MHz) i.e. decametric–hectometric or DH radio burst. These DH CMEs are relatively faster and wider than the normal CMEs. The average speed and apparent width of these CMEs is 1048 km/s and 98°, respectively. Majority (a…
Globular Clusters and X-Ray Point Sources in Centaurus A (NGC 5128)
Jordán, Andrés; Raychaudhury, Somak; Whitaker, Katherine E. +6 more
We detect 353 X-ray point sources, mostly low-mass X-ray binaries (LMXBs), in four Chandra observations of Centaurus A (NGC 5128), the nearest giant early-type galaxy, and correlate this point-source population with the largest available ensemble of confirmed and likely globular clusters (GCs) associated with this galaxy. Of the X-ray sources, 31 …
An AKARI Search for Intracluster Dust of Globular Clusters
Yamamura, Issei; Matsunaga, Noriyuki; Mito, Hiroyuki +7 more
We report on observations of 12 globular clusters with the Far-Infrared Surveyor (FIS) aboard the AKARI satellite. Our goal is to search for emission from cold dust within clusters. We detected diffuse emissions toward NGC6402 and 2808, but the IRAS 100µm maps show the presence of strong background radiation. They are likely to have been emi…
Spectral Properties of Prompt Emission of Four Short Gamma-Ray Bursts Observed by the Suzaku-WAM and the Konus-Wind
Yamaoka, Kazutaka; Fukazawa, Yasushi; Ohno, Masanori +16 more
We have performed a joint analysis of prompt emission from four bright short gamma-ray bursts (GRBs) with the Suzaku-WAM and the Konus-Wind experiments. This joint analysis allows us to investigate the spectral properties of short-duration bursts over a wider energy band with a higher accuracy. We find that these bursts have a high Epeak