Search Publications
Coordinated interhemispheric SuperDARN radar observations of the ionospheric response to flux transfer events observed by the Cluster spacecraft at the high-latitude magnetopause
Balogh, A.; Davies, J. A.; Wild, J. A. +11 more
At 10:00 UT on 14 February 2001, the quartet of ESA Cluster spacecraft were approaching the Northern Hemisphere high-latitude magnetopause in the post-noon sector on an outbound trajectory. At this time, the interplanetary magnetic field incident upon the dayside magnetopause was oriented southward and duskward (BZ negative, BY positive), having t…
The Stellar Content of Henize 2-10 from Space Telescope Imaging Spectrograph Ultraviolet Spectroscopy
Calzetti, Daniela; Leitherer, Claus; Chandar, Rupali +1 more
We use new Space Telescope Imaging Spectrograph long-slit ultraviolet spectroscopy of region A in the nearby starbursting galaxy He 2-10 to examine properties of both compact individual super-star clusters and diffuse intracluster regions. The four most luminous clusters in our slit formed coevally 4-5 Myr ago and have lower mass estimates of seve…
High-resolution X-ray spectroscopy of tau Scorpii (B0.2V) with XMM-Newton
Raassen, A. J. J.; Mewe, R.; Güdel, M. +3 more
We report the analysis of the first high-resolution X-ray spectrum of the B0.2V star tau Scorpii obtained with the Reflection Grating Spectrometers (RGS) and the EPIC-MOS CCD spectrometers on board XMM-Newton. The spectrum exhibits bright emission lines of the H- and He-like ions of C, N, O, Ne, Mg, and Si, as well as Fe XVII & Fe XVIII lines.…
An XMM-Newton Observation of 4U 1755-33 in Quiescence: Evidence of a Fossil X-Ray Jet
White, Nicholas E.; Angelini, Lorella
We report an XMM-Newton observation of the low-mass X-ray binary and black hole candidate 4U 1755-33. This source had been a bright persistent source for at least 25 yr, but in 1995 it entered an extended quiescent phase. 4U 1755-33 was not detected with an upper limit to the 2-10 keV luminosity of 3.6×1031d24kpc e…
XMM-Newton surveys of the Canada-France Redshift Survey fields - I. The submillimetre/X-ray relation
Eales, Stephen A.; Thuan, Trinh X.; Gear, Walter K. +7 more
First results from XMM-Newton observations of the Canada-France Redshift Survey (CFRS) 3-h, 10-h and 14-h fields are presented. Limited regions of two of the XMM surveys (3 and 14 h) are compared with the Canada-UK Deep Submillimetre Surveys (CUDSS) undertaken with SCUBA. None of the 27 SCUBA sources in the 3-h field is detected by XMM, while one …
A Turbulent Origin for Flocculent Spiral Structure in Galaxies. II. Observations and Models of M33
Cuillandre, Jean-Charles; Elmegreen, Bruce G.; Elmegreen, Debra Meloy +1 more
Fourier transform power spectra of azimuthal scans of the optical structure of M33 are evaluated for B, V, and R passbands and fitted to fractal models of continuum emission with superposed star formation. Power spectra are also determined for Hα. The best models have intrinsic power spectra with one-dimensional slopes of around -0.7+/-0.7, signif…
An empirical test of the theoretical population corrections to the red clump absolute magnitude
Salaris, Maurizio; Percival, Susan M.
The mean absolute magnitude of the local red clump (RC), MRCλ, is a very well-determined quantity owing to the availability of accurate Hipparcos parallaxes for several hundred RC stars, potentially allowing it to be used as an accurate extragalactic distance indicator. Theoretical models predict that the RC mean magnitude is…
JEM-X science analysis software
Hornstrup, A.; Oxborrow, C. A.; Huovelin, J. +9 more
The science analysis of the data from JEM-X on INTEGRAL is performed through a number of levels including corrections, good time selection, imaging and source finding, spectrum and light-curve extraction. These levels consist of individual executables and the running of the complete analysis is controlled by a script where parameters for detailed …
Chandra and XMM Observations of the Accretion Disk Corona Source 2S 0921-63
Kallman, T. R.; Angelini, L.; Boroson, B. +1 more
We analyze observations of the low-mass X-ray binary (LMXB) 2S 0921-63 obtained with the gratings and CCDs on Chandra and XMM. This object is a high-inclination system showing evidence for an accretion disk corona (ADC). Such a corona has the potential to constrain the properties of the heated accretion disk in this system and other LMXBs by exten…
Optical Pulse-Phased Photopolarimetry of PSR B0656+14
Halpern, J. P.; Martin, C.; Kern, B. +1 more
We have observed the optical pulse profile of PSR B0656+14 in 10 phase bins at a high signal-to-noise ratio, and have measured the linear polarization profile over 30% of the pulsar period with some significance. The pulse profile is double-peaked, with a bridge of emission between the two peaks, similar to gamma-ray profiles observed in other pul…