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The Multiphase Absorption Systems toward PG 1206+459
Charlton, Jane C.; Churchill, Christopher W.; Palma, Christopher +1 more
A high-resolution (R=30,000) ultraviolet spectrum is presented, which covers Lyα and many low-, intermediate-, and high-ionization transitions in the three Mg II-selected absorption systems toward the quasar PG 1206+459. Three systems (A, B, and C), which are clustered within 1500 km s-1 at z~0.93, were originally identified in a spectr…
On the Size Difference between Red and Blue Globular Clusters
Brodie, Jean P.; Larsen, Søren S.
Several recent studies have reported a mean size difference of about 20% between the metal-rich and metal-poor subpopulations of globular clusters (GCs) in a variety of galaxies. In this paper, we investigate the possibility that the size difference might be a projection effect, resulting from a correlation between cluster size and galactocentric …
High resolution spectroscopy and emission line imaging of DEM L 71 with XMM-Newton
Kaastra, J. S.; Vink, J.; Bleeker, J. A. M. +1 more
The X-ray emission from the supernova remnant DEM L 71 is measured and analysed using the high-resolution cameras and spectrometers on board XMM-Newton. The spectrum from the outer shell is reproduced very well by two plasma components of kTe = 0.3 and 0.8 keV. The abundance value from this shell is consistent with the average LMC value…
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…