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XMM-Newton observations of the young open cluster Blanco 1. I. X-ray spectroscopy and photometry
Harnden, F. R., Jr.; Micela, G.; Sciortino, S. +2 more
We present an X-ray study of the high metallicity young open cluster Blanco 1 based on XMM-Newton data. X-ray spectroscopy of cluster members is presented for the first time as well as new X-ray distribution functions of late-type stars. We detected all known dF and dG stars in the EPIC field and 80% and 90% of dK and dM stars, respectively. The X…
An XMM-Newton study of the RGH 80 galaxy group
Böhringer, H.; Matsushita, K.; Xue, Y. -J.
We present an X-ray study of the galaxy group RGH 80, observed by XMM-Newton. The X-ray emission of the gas is detected out to ∼462 h-150 kpc, corresponding to ∼0.45 r200. The group is relatively gas rich and luminous with respect to its temperature of 1.01 ± 0.01 keV. Using the deprojected spectral analysis, we fi…
Very cold cores in the Taurus Molecular Ring as seen by ISO
Lemke, D.; Haas, M.; Onishi, T. +2 more
Three prominent cold objects of the
INTEGRAL observations of the PSR B1259-63/SS2883 system after the 2004 periastron passage
Mereghetti, S.; Rodriguez, J.; Walter, R. +3 more
The millisecond pulsar
The XMM-Newton view of the X-ray halo and jet of NGC 6251
Cheung, C. C.; Tavecchio, F.; Mushotzky, R. F. +3 more
We present an XMM-Newton observation of the radio jet and diffuse halo of the nearby radio galaxy NGC 6251. The EPIC spectrum of the galaxy's halo is best-fitted by a thermal model with temperature kT ∼ 1.6 keV and sub-solar abundances. Interestingly, an additional hard X-ray component is required to fit the EPIC spectra of the halo above 3 keV, a…
The evolution and simulation of the outburst from XZ Tauri - A possible EXor?
Ray, T. P.; Coffey, D.; Downes, T. P.
We report on multi-epoch HST/WFPC2 images of the XZ Tauri binary, and its outflow, covering the period from 1995 to 2001. Data from 1995 to 1998 have already been published in the literature. Additional images, from 1999, 2000 and 2001 are presented here. These reveal not only further dynamical and morphological evolution of the XZ Tauri outflow b…
X-ray sources and their optical counterparts in the globular cluster M 22
Rizzi, L.; Webb, N. A.; Barret, D. +3 more
Using XMM-Newton EPIC imaging data, we have detected 50 low-luminosity X-ray sources in the field of view of M 22, where 5±3 of these sources are likely to be related to the cluster. Using differential optical photometry, we have identified probable counterparts to those sources belonging to the cluster. Using X-ray spectroscopic and timing studie…
High-frequency slowly drifting structures and X-ray sources observed by RHESSI
Krucker, S.; Karlický, M.; Fárník, F.
Three solar flares (April 4, 2002, May 17, 2002, and August 30, 2002) with the 0.4-2.0 GHz slowly drifting structures were selected and analyzed together with RHESSI X-ray observations. Two events (April 4, 2002 and May 17, 2002) were observed above and one event (August 30, 2002) close to the solar limb. While in April 4, 2002 and August 30, 2002…
Network boundary origins of fast solar wind seen in the low transition region?
Doyle, J. G.; Xia, L. D.; Popescu, M. D.
We present a study of a high spatial resolution raster acquired on-disk with the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) grating spectrograph on SoHO (the Solar and Heliospheric Observatory) in a polar Coronal Hole (CH) region. We analyse two EUV emission lines, representing the properties of solar plasma in the low transition …
The Sun as an X-ray star: Active region evolution, rotational modulation, and implications for stellar X-ray variability
Orlando, S.; Peres, G.; Reale, F.
We study the contribution of an active region and its core to the luminosity and the spectrum of the Sun in the X-ray band and to the relevant solar emission measure vs. temperature distribution, EM(T). We also study the relevant changes in the course of four solar rotations, and the solar rotational modulation due to this active region, the only …