Search Publications
Missions
Journals
Publication Years
Planetary Nebulae Detected in the Spitzer Space Telescope GLIMPSE 3D Legacy Survey
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao
We used the data from the Spitzer Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) to investigate the mid-infrared (MIR) properties of planetary nebulae (PNs) and PN candidates. In previous studies of GLIMPSE I and II data, we have shown that these MIR data are very useful in distinguishing PNs from other emission-line objects. In the pre…
Latitudinal variation of upper tropospheric NH3 on Saturn derived from Cassini/CIRS far-infrared measurements
Fletcher, L. N.; Irwin, P. G. J.; Calcutt, S. B. +3 more
Ammonia (NH3) has been detected both on Saturn and Jupiter, and although its concentration and distribution has been well-studied on Jupiter, it has proven more difficult to do so on Saturn due to higher sensitivity requirements resulting from Saturn's lower atmospheric temperatures and the dominance of Saturn's phosphine which masks th…
Globular cluster systems in fossil groups: NGC 6482, NGC 1132, and ESO 306-017
Côté, P.; Blakeslee, J. P.; Jordán, A. +6 more
We study the globular cluster (GC) systems in three representative fossil group galaxies: the nearest (NGC 6482), the prototype (NGC 1132) and the most massive known to date (ESO 306-017). This is the first systematic study of GC systems in fossil groups. Using data obtained with the Hubble Space Telescope Advanced Camera for Surveys in the F475W …
Investigation of Quasi-periodic Solar Oscillations in Sunspots Based on SOHO/MDI Magnetograms
Riehokainen, A.; Kallunki, J.
In this work we study quasi-periodic solar oscillations in sunspots, based on the variation of the amplitude of the magnetic field strength and the variation of the sunspot area. We investigate long-period oscillations between three minutes and ten hours. The magnetic field synoptic maps were obtained from the SOHO/MDI. Wavelet (Morlet), global wa…
New Variable Jet Models for HH 34
Raga, A. C.; Noriega-Crespo, A.; Esquivel, A. +1 more
We consider newly derived proper motions of the HH 34 jet to reconstruct the evolution of this outflow. We first extrapolate ballistic trajectories for the knots (starting from their present-day positions and velocities) and find that at ~1000 yr in the future most of them will merge to form a larger-mass structure. This mass structure will be for…
Tidal Interactions at the Edge of the Local Group: New Evidence for Tidal Features in the Antlia Dwarf Galaxy
Conselice, Christopher J.; Penny, Samantha J.; Pimbblet, Kevin A. +3 more
Using deep B-band imaging down to ~µ B = 26 mag arcsec-2, we present evidence for tidal tails in the Antlia Dwarf galaxy, one of the most distant members of the Local Group. This elongation is in the direction of Antlia's nearest neighbor, the Magellanic-type NGC 3109. The tail is offset by <10° from a vector linkin…
Multi-frequency study of supernova remnants in the Large Magellanic Cloud. Confirmation of the supernova remnant status of DEM L205
Pietsch, W.; Haberl, F.; Gruendl, R. A. +11 more
Context. The Large Magellanic Cloud (LMC) is an ideal target for the study of an unbiased and complete sample of supernova remnants (SNRs). We started an X-ray survey of the LMC with XMM-Newton, which, in combination with observations at other wavelengths, will allow us to discover and study remnants that are either even fainter or more evolved (o…
The horizontal branch morphology of M 31 globular clusters. Extreme second parameter effect in outer halo clusters
Cacciari, C.; Bellazzini, M.; Galleti, S. +4 more
We use deep, high quality color magnitude diagrams obtained with the Hubble Space Telescope to compute a simplified version of the Mironov index (SMI; B/(B+R)) to parametrize the horizontal branch (HB) morphology for 23 globular clusters in the M 31 galaxy (Sample A), all located in the outer halo at projected distances between 10 kpc and 100 kpc.…
Chandra and Suzaku Observations of the Be/X-Ray Star HD110432
Nowak, M. A.; Torrejón, J. M.; Schulz, N. S.
We present an analysis of a pointed 141 ks Chandra high-resolution transmission gratings observation of the Be X-ray emitting star HD110432, a prominent member of the γ Cas analogs. This observation represents the first high-resolution spectrum taken for this source as well as the longest uninterrupted observation of any γ Cas analog. The Chandra …
Habitable periglacial landscapes in martian mid-latitudes
Hauber, E.; Ulrich, M.; Schirrmeister, L. +2 more
Subsurface permafrost environments on Mars are considered to be zones where extant life could have survived. For the identification of possible habitats it is important to understand periglacial landscape evolution and related subsurface and environmental conditions. Many landforms that are interpreted to be related to ground ice are located in th…