Search Publications
An XMM-Newton view of planetary nebulae in the Small Magellanic Cloud. The X-ray luminous central star of SMP SMC 22
Rauch, T.; Haberl, F.; Tiengo, A. +5 more
During an X-ray survey of the Small Magellanic Cloud, carried out with the XMM-Newton satellite, we detected significant soft X-ray emission from the central star of the high-excitation planetary nebula SMP SMC 22. Its very soft spectrum is reproduced well with a non-local thermodynamical equilibrium model atmosphere composed of H, He, C, N, and O…
Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO
Gallagher, Peter T.; Conlon, Paul A.
The three-dimensional magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of STEREO. A set of coronal field configurations was initially generated from extrapolations of the photospheric magnetic field observed by the Michelson Doppler Image…
Discovery of a 693.5 s Period in the X-Ray Binary 4U 1820 - 30: A Superhump Interpretation
Chakrabarty, Deepto; Wang, Zhongxiang
The X-ray source 4U 1820-30 in the globular cluster NGC 6624 is known as the most compact binary among the identified X-ray binaries (XRBs). Having an orbital period of 685.0 s, the source consists of a neutron star (NS) primary and likely a 0.06-0.08 M sun white dwarf (WD) secondary. Here, we report on far-ultraviolet (FUV) observation…
Spitzer MIPS 24 and 70 µm Imaging Near the South Ecliptic Pole: Maps and Source Catalogs
Devlin, Mark J.; Scott, Douglas; Chapin, Edward L. +8 more
We have imaged an 11.5 deg2 region of sky toward the South Ecliptic Pole (R.A. =04h43m, decl. =-53°40', J2000) at 24 and 70 µm with MIPS, the Multiband Imaging Photometer for Spitzer. This region is coincident with a field mapped at longer wavelengths by AKARI and BLAST. We discuss our data reduction and sour…
Satellites in the field and lens galaxies: SDSS/COSMOS versus SLACS/CLASS
Mao, S.; Jackson, N.; Li, Cheng +1 more
The incidence of subgalactic level substructures is an important quantity, as it is a generic prediction of high-resolution cold dark matter (CDM) models which is susceptible to observational test. Confrontation of theory with observations is currently in an uncertain state. In particular, gravitational lens systems appear to show evidence for flu…
Malin1: interacting galaxy pair?
Moiseev, A. V.; Reshetnikov, V. P.; Sotnikova, N. Ya.
Malin1 is a unique, extraordinarily large low-surface brightness galaxy. The structure and the origins of the galaxy are poorly understood. The reason for this is the absence of detailed observational data, especially of high-resolution kinematics. In this Letter, we study the stellar kinematics of the inner part (r <= 15 kpc) of Malin1.
W…A Method for Separating Coronal Mass Ejections from the Quiescent Corona
Morgan, Huw; Habbal, Shadia
A method for separating coronal mass ejections (CMEs) from the quiescent corona in white-light coronagraph images is presented. Such a separation allows the study of CME structure, as well as enabling a study of the quiescent coronal structure, without contamination by the CME. The fact that the large-scale quiescent corona is very close to radial…
Flows along cometary tails in the Helix planetary nebula NGC 7293
Boumis, P.; Meaburn, J.
Previous velocity images which reveal flows of ionized gas along the most prominent cometary tail (from Knot 38) in the Helix planetary nebula are compared with that taken at optical wavelengths with the Hubble Space Telescope and with an image in the emission from molecular hydrogen. The flows from the second most prominent tail from Knot 14 are …
SpectraFactory.net: A Database of Molecular Model Spectra
Cami, J.; van Malderen, R.; Markwick, A. J.
We present a homogeneous database of synthetic molecular absorption and emission spectra from the optical to mm wavelengths for a large range of temperatures and column densities relevant for various astrophysical purposes, but in particular for the analysis, identification, and first-order analysis of molecular bands in spectroscopic observations…
Widely different characteristics of oxygen and hydrogen ion escape from Venus
Kallio, E.; Janhunen, P.; Jarvinen, R. +2 more
We study the solar wind induced escape of O+ and H+ ions from Venus' atmosphere in the HYB-Venus hybrid simulation. Most of the previous Venus global plasma modelling studies have concentrated only on the O+ escape. According to the hybrid simulation, planetary O+ and H+ ions behave very diffe…