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The X-ray reflector in NGC 4945: a time- and space-resolved portrait
Bianchi, S.; Elvis, M.; Fabbiano, G. +5 more
We present a time, spectral and imaging analysis of the X-ray reflector in NGC 4945, which reveals its geometrical and physical structure with unprecedented detail. NGC 4945 hosts one of the brightest AGN in the sky above 10 keV, but it is only visible through its reflected/scattered emission below 10 keV, due to absorption by a column density of …
The XMM-Newton survey of the Small Magellanic Cloud
Pietsch, W.; Haberl, F.; Hatzidimitriou, D. +13 more
Context. Although numerous archival XMM-Newton observations existed towards the Small Magellanic Cloud (SMC) before 2009, only a fraction of the whole galaxy had been covered.
Aims: Between May 2009 and March 2010, we carried out an XMM-Newton survey of the SMC, to ensure a complete coverage of both its bar and wing. Thirty-three observations…
Discovery of multiphase cold accretion in a massive galaxy at z = 0.7
Kacprzak, Glenn G.; Spitler, Lee R.; Steidel, Charles C. +2 more
We present detailed photo+collisional ionization models and kinematic models of the multiphase absorbing gas, detected within the Hubble Space Telescope(HST)/COS, HST/STIS and Keck/HIRES spectra of the background quasar TON 153 at 104 kpc along the projected minor axis of a star-forming spiral galaxy (z = 0.6610). Complementary g'r'i'Ks photometry…
SXP 1062, a young Be X-ray binary pulsar with long spin period. Implications for the neutron star birth spin
Pietsch, W.; Haberl, F.; Filipović, M. D. +2 more
Context. The Small Magellanic Cloud (SMC) is ideally suited to investigating the recent star formation history from X-ray source population studies. It harbours a large number of Be/X-ray binaries (Be stars with an accreting neutron star as companion), and the supernova remnants can be easily resolved with imaging X-ray instruments.
Aims: We …
Approximating the X-ray spectrum emitted from astrophysical charge exchange
Smith, R. K.; Foster, A. R.; Brickhouse, N. S.
Charge exchange (CX), both onto ions in the solar wind and potentially in other astrophysical contexts, can create X-ray emission lines largely indistinguishable from those created in collisional or photoionized plasmas. The prime distinguishing characteristic is in the distinctly different line ratios generated by the CX process. A complete astro…
A four-year XMM-Newton/Chandra monitoring campaign of the Galactic centre: analysing the X-ray transients
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +5 more
We report on the results of a four-year long X-ray monitoring campaign of the central 1.2 square degrees of our Galaxy, performed with Chandra and XMM-Newton between 2005 and 2008. Our study focuses on the properties of transient X-ray sources that reach 2-10 keV luminosities of LX ≳ 1034 erg s-1 for an assumed dis…
Flare-generated Type II Burst without Associated Coronal Mass Ejection
Zhukov, A. N.; Magdalenić, J.; Vršnak, B. +2 more
We present a study of the solar coronal shock wave on 2005 November 14 associated with the GOES M3.9 flare that occurred close to the east limb (S06° E60°). The shock signature, a type II radio burst, had an unusually high starting frequency of about 800 MHz, indicating that the shock was formed at a rather low height. The position of the radio so…
Saturn's inner magnetospheric convection pattern: Further evidence
Gurnett, D. A.; Thomsen, M. F.; Tokar, R. L. +7 more
Observations of the radial locations of satellite absorption microsignatures in energetic particle data at Saturn have suggested the existence of an average convection pattern, fixed in local time, that is superimposed on the dominant near-corotation of the inner magnetosphere. Such a pattern should have additional observational consequences, and …
Substructure in the most massive GEEC groups: field-like populations in dynamically active groups
Mulchaey, John S.; Balogh, Michael L.; Harris, William E. +6 more
The presence of substructure in galaxy groups and clusters is believed to be a sign of recent galaxy accretion and can be used to probe not only the assembly history of these structures, but also the evolution of their member galaxies. Using the Dressler-Shectman (DS) test, we study substructure in a sample of intermediate-redshift (z∼ 0.4) galaxy…
Modelling the dust emission from dense interstellar clouds: disentangling the effects of radiative transfer and dust properties
Abergel, A.; Bernard, J. -P.; Juvela, M. +9 more
Context. Dust emission is increasingly used as a tracer of the mass in the interstellar medium. With the combination of Planck and Herschel observatories, we now have both the spectral coverage and the angular resolution required to observe dense and cold molecular clouds. However, as these clouds are optically thick at short wavelengths but optic…