Search Publications
Magnetosheath excursion and the relevant transport process at the magnetopause
Dandouras, I.; Rème, H.; Cao, J. B. +5 more
A large-amplitude excursion of the magnetosheath (MS) in quiet solar wind conditions on 17 March 2004 was recorded simultaneously by the Cluster and TC-1 spacecraft. During this period, the IMF Bz was entirely northward. The coherence between the bow shock motion and magnetopause (MP) motion is revealed and the excursion velocities of t…
Magnetic Field Elements at High Latitude: Lifetime and Rotation Rate
Liu, Y.; Zhao, J.
Using one-minute cadence time-series full disk magnetograms taken by the SOHO/MDI, we have studied the magnetic field elements at high latitude (poleward of 65° in latitude). It is found that an average lifetime of the magnetic field elements is 16.5 h during solar minimum, much longer than that during solar maximum (7.3 h). During solar minimum, …
A Hubble Space Telescope/NICMOS view of the prototypical giant H ii region NGC604 in M33
Walborn, Nolan R.; Bolatto, Alberto; Barbá, Rodolfo H. +5 more
We present the first high-spatial-resolution near-infrared (NIR) imaging of NGC604, obtained with the NICMOS camera onboard the Hubble Space Telescope (HST). These NICMOS broad-band images reveal new NIR point sources, clusters, and diffuse structures. We find an excellent spatial correlation between the 8.4 GHz radio continuum and the 2.2 µ…
D/H Along the Line of Sight of REJ 1738+665
Moos, H. W.; Dupuis, J.; Sonnentrucker, P. +2 more
We present a new D/H measurement along the sightline to REJ 1738+665, one of the hottest DA stars (T eff ~ 76,000 K, log g ~ 7.85), probing a line of sight in the direction (l = 96fdg89, b = 31fdg95) and extending over a path-length of ~243 pc. Hot DA stars are useful sources for mapping interstellar absorption because of the lack of me…
XMMSL1 J060636.2-694933: an XMM-Newton slew discovery and Swift/Magellan follow up of a new classical nova in the LMC
Read, A. M.; Esquej, P.; Freyberg, M. J. +7 more
Aims: In order to discover new X-ray transients, the data taken by XMM-Newton as it slews between targets are being processed and cross-correlated with other X-ray observations.
Methods: A bright source, XMMSL1 J060636.2-694933, was detected on 18 July 2006 at a position where no previous X-ray source had been seen. The XMM-Newton slew data, p…
Very peculiar wind from BD+53°2790, the optical counterpart to 4U 2206+54
Negueruela, I.; Ribó, M.; Blay, P.
BD+53°2790, an O9.5V star, is the optical counterpart to the HMXRB 4U 2206+54. This system was classified initially as a BeX, but observational evidence soon stressed the need to revise this classification. The permanent asymmetry in the Hα line profiles (in contrast with the cyclic variations shown by Be stars), the variations in the profile of t…
A study of B6-9 and A giants
Branham, Richard L., Jr.
To study the kinematics of the B6-9 and A giant stars (luminosity class III), proper motions taken from van Leeuwen's new reduction of the Hipparcos catalogue are used. 36 per cent of the B6-9 stars appear to pertain to the Gould belt, and were excluded from the study. No A star, however, seems to be associated with the Gould belt. 597 B6-9 giants…
Particle Propagation in the Galactic Center and Spatial Distribution of Non-Thermal X-Rays
Maeda, Yoshitomo; Kokubun, Motohide; Nakazawa, Kazuhiro +9 more
We showed that if the non-thermal emission from the galactic center in the range 14-40 keV is due to inverse bremsstrahlung emission of subrelativistic protons, their interactions with hot and cold fractions of the interstellar medium are equally important. Our estimation shows that about 30% of the total non-thermal flux from the GC in the range …
On the nature of the near-UV extended light in Seyfert galaxies
Storchi-Bergmann, T.; Schmitt, H. R.; González Delgado, R. M. +4 more
We study the nature of the extended near-UV emission in the inner kiloparsec of a sample of 15 Seyfert (Sy) galaxies which have both near-UV (F330W) and narrow-band [OIII] high-resolution Hubble images. For the majority of the objects, we find a very similar morphology in both bands. From the [OIII] images, we construct synthetic images of the neb…
Globular Cluster Populations in Four Early-Type Poststarburst Galaxies
Schweizer, François; Goudfrooij, Paul; Puzia, Thomas H. +2 more
We present a study of the globular cluster (GC) systems of four early-type poststarburst galaxies using deep g- and I-band images from the Advanced Camera for Surveys aboard the Hubble Space Telescope. All the galaxies feature shells distributed around their main bodies and are thus likely merger remnants. The color distribution of the GCs in all …