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Smashing the Guitar: An Evolving Neutron Star Bow Shock
Chatterjee, S.; Cordes, J. M.
The Guitar Nebula is a spectacular example of an Hα bow shock nebula produced by the interaction of a neutron star with its environment. The radio pulsar B2224+65 is traveling at ~800-1600 km s-1 (for a distance of 1-2 kpc), placing it on the high-velocity tail of the pulsar velocity distribution. Here we report time evolution in the sh…
Truncation of stellar disks in galaxies at z ≈ 1
Pérez, I.
We report here the first evidence for stellar disk truncation at high redshift, based on surface photometry of a sample of 16 high redshift (0.6<z<1.0) disk galaxies from the GOODS HST/ACS data. The radial profiles are best fit by a double exponential profile. This result agrees with the profile of disks in local galaxies. The cosmological s…
A Hubble Space Telescope WFPC2 Investigation of the Disk-Halo Interface in NGC 891
Norman, Colin A.; Dettmar, Ralf-Jürgen; Rossa, Jörn +1 more
We present deep narrowband observations with high spatial resolution of extraplanar diffuse ionized gas in the halo of NGC 891, obtained with the WFPC2 on board the HST. Our Hα observations, centered on the northern part of NGC 891, reveal an extended gaseous halo, which fills almost the entire field of view of our WFPC2 observation. Whereas NGC 8…
Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton
Parmar, A. N.; Boirin, L.; Paltani, S. +2 more
We report the discovery of narrow Fe XXV and Fe XXVI Kα X-ray absorption lines at 6.65+0.05-0.02 and 6.95+0.05-0.04 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an XMM-Newton observation performed in September 2002. In addition, there is marginal evidence …
The Hubble Deep Field North SCUBA Super-map - II. Multiwavelength properties
Nandra, Kirpal; Halpern, Mark; Chapman, Scott +3 more
We present radio, optical and X-ray-detected counterparts to the submillimetre sources found using SCUBA in the Hubble Deep Field North region (GOODS-N). A new counterpart identification statistic is developed to identify properties of galaxies detected at other wavelengths that can be used to aid counterpart identification. We discriminate betwee…
On the network structures in solar equatorial coronal holes. Observations of SUMER and MDI on SOHO
Wilhelm, K.; Marsch, E.; Xia, L. D.
By combining observations of the Sun made by SUMER and MDI aboard SOHO, the network structures in equatorial coronal holes have been studied, in particular the relationship between the ultraviolet emission-line parameters (line radiance, Doppler shift and line width) and the underlying magnetic field. The bases of coronal holes seen in chromospher…
First observation of Jupiter by XMM-Newton
Branduardi-Raymont, G.; Soria, R.; Ramsay, G. +4 more
We present the first X-ray observation of Jupiter by XMM-Newton. Images taken with the EPIC cameras show prominent emission, essentially all confined to the 0.2-2.0 keV band, from the planet's auroral spots; their spectra can be modelled with a combination of unresolved emission lines of highly ionised oxygen (OVII and OVIII), and a pseudo-continu…
Organic matter in Seyfert 2 nuclei: Comparison with our Galactic center lines of sight
Dartois, E.; d'Hendecourt, L.; Marco, O. +3 more
We present ESO - Very Large Telescope and ESA - Infrared Space Observatory 3 to 4 µm spectra of Seyfert 2 nuclei as compared to our galactic center lines of sight. The diffuse interstellar medium probed in both environments displays the characteristic 3.4 µm aliphatic CH stretch absorptions of refractory carbonaceous material. The prof…
About the rotation of the solar radiative interior
Henney, C. J.; Howe, R.; Eff-Darwich, A. +13 more
In the modern era of helioseismology we have a wealth of high-quality data available, e.g., more than 6 years of data collected by the various instruments on board the SOHO mission, and an even more extensive ground-based set of observations covering a full solar cycle. Thanks to this effort a detailed picture of the internal rotation of the Sun h…
Abundance analysis of targets for the COROT/MONS asteroseismology missions. II. Abundance analysis of the COROT main targets
Magain, P.; Catala, C.; Bikmaev, I. F. +13 more
One of the goals of the ground-based support program for the COROT and MONS/RÖMER satellite missions is to characterize suitable target stars for the part of the missions dedicated to asteroseismology. We present the detailed abundance analysis of nine of the potential COROT main targets using the semi-automatic software VWA. For two additional CO…