Search Publications
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…
Phase-resolved optical and X-ray spectroscopy of low-mass X-ray binary X1822-371
Hakala, P.; Vilhu, O.; Somero, A. +2 more
Context. X1822-371 is the prototypical accretion disc corona X-ray source, a low-mass X-ray binary viewed at very high inclination, thereby allowing the disc structure and extended disc coronal regions to be visible. As the brightest (closest) such source, X1822-371 is ideal for studying the shape and edge structure of an accretion disc, and compa…
Discovery of the neutron star spin and a possible orbital period from the Be/X-ray binary IGR J05414-6858 in the LMC
Pietsch, W.; Haberl, F.; Greiner, J. +7 more
Context. The number of known Be/X-ray binaries in the Large Magellanic Cloud is small compared to the observed population of the Galaxy or the Small Magellanic Cloud. The discovery of a system in outburst provides the rare opportunity to measure its X-ray properties in detail.
Aims: IGR J05414-6858 was discovered in 2010 with INTEGRAL and was…
Discovery of Three Distant, Cold Brown Dwarfs in the WFC3 Infrared Spectroscopic Parallels Survey
Scarlata, C.; Malkan, M.; Teplitz, H. +12 more
We present the discovery of three late-type (>=T4.5) brown dwarfs, including a probable Y dwarf, in the WFC3 Infrared Spectroscopic Parallels (WISP) survey. We use the G141 grism spectra to determine the spectral types of the dwarfs and derive distance estimates based on a comparison with nearby T dwarfs with known parallaxes. These are the mos…
Plasma Wave Observations at Earth, Jupiter, and Saturn
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +5 more
Plasma wave emissions have been detected at all of the planets that have been visited by spacecraft equipped with plasma wave instruments (Mercury will be explored by the plasma wave instrument on BepiColombo Mercury Magnetospheric Orbiter in 2022.). Many of these emissions are believed to play a role in the acceleration of energetic particles, es…
SN 2002bu—Another SN 2008S-like Transient
Kochanek, C. S.; Dai, X.; Szczygieł, D. M.
We observed supernova (SN) 2002bu in the near-IR with the Hubble Space Telescope (HST), the mid-IR with the Spitzer Space Telescope, and in X-rays with Swift 10 years after the explosion. If the faint L H ~ 102 L ⊙ HST near-IR source at the transient position is the near-IR counterpart of SN 2002bu, then the source…