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Probing Warm-Hot Intergalactic Medium Associated with the Virgo Cluster Using an Oxygen Absorption Line
Kelley, Richard L.; Kilbourne, Caroline A.; Ohashi, Takaya +8 more
To detect a warm-hot intergalactic medium (WHIM) associated with the large-scale structure of the universe, we observed a quasar behind the Virgo cluster with XMM-Newton. With 54ks exposure, we marginally detected an O VIII Kα absorption line at 650.9+0.8-1.9eV in the RGS spectra, with a statistical confidence of 96.4%. The o…
XMM-Newton Observations of NGC 507: Supersolar Metal Abundances in the Hot Interstellar Medium
Fabbiano, Giuseppina; Kim, Dong-Woo
We present the results of the X-ray XMM-Newton observations of NGC 507, a dominant elliptical galaxy in a small group of galaxies, and report supersolar metal abundances of both Fe and α-elements in the hot interstellar medium (ISM) of this galaxy. These results are robust in that we considered all possible systematic effects in our analysis. We f…
The Fundamental Plane Evolution of Active Galactic Nucleus Host Galaxies
van der Marel, Roeland P.; Urry, C. Megan; Lira, Paulina +2 more
We measured the stellar velocity dispersions of 15 active galactic nucleus (AGN) host galaxies at redshifts as high as ~0.34. Combining these with published velocity dispersion measurements from the literature, we study the fundamental plane of AGN host galaxies and its evolution. BL Lac object hosts and radio galaxies seem to lie on the same fund…
Tracing the ``Acoustic'' Solar Cycle: A Direct Comparison of BiSON and GOLF Low-l p-Mode Variations
Jiménez-Reyes, S. J.; García, R. A.; Chaplin, W. J. +1 more
We present a detailed, comparative study of low angular degree solar p-mode variations extracted by analyses of two sets of observational data. These were collected by the ground-based Birmingham Solar-Oscillations Network (BiSON) and the Global Oscillations at Low Frequency (GOLF) instrument on board the ESA/NASA SOHO satellite. The ~5.5 yr perio…
Confronting the Superbubble Model with X-Ray Observations of 30 Doradus C
Wang, Q. Daniel; Smith, David A.
We present an analysis of XMM-Newton observations of the superbubble 30 Dor C and compare the results with the predictions from the standard wind-blown bubble model. We find that the observed X-ray spectra cannot be fitted satisfactorily with the model alone and that there is evidence for nonthermal X-ray emission, which is particularly important …
Compressive fluctuations in high-latitude solar wind
Bavassano, B.; Pietropaolo, E.; Bruno, R.
. Solar wind compressive fluctuations at MHD scales have been extensively studied in the past using data from spacecraft on the ecliptic plane. In the present study, based on plasma and magnetic field measurements by Ulysses, a statistical analysis of the compressive fluctuations observed in the high-latitude solar wind is performed. Data are from…
An XMM-Newton Observation of the Seyfert 2 Galaxy NGC 6300. I. The Nucleus
Awaki, Hisamitsu; Maddox, Larry A.; Leighly, Karen M. +4 more
We present results from a half-day observation by XMM-Newton of the nucleus of the nearby Seyfert 2 galaxy NGC 6300. The X-ray spectrum of the nucleus consists of a heavily absorbed hard component dominating the 3-10 keV band and a soft component seen in the 0.2-2 keV band. In the hard band, the spectrum is well fitted by a power-law model with ph…
NGC 6543. I. Understanding the Anatomy of the Cat's Eye
Balick, Bruce
Hubble Space Telescope images of NGC 6543 taken in 1994.7 through a variety of narrowband filters yield a very detailed structure in emission lines of low and moderate ionization. On the whole, the core of NGC 6543 is optically thin to ionizing radiation. As expected, the general ionization state of the nebula decreases with radius; however, some …
Spatial and temporal properties of AKR burst emission derived from Cluster WBD VLBI studies
Gurnett, D.; Mutel, R.; Christopher, I.
Available from http://www.copernicus.org/site/EGU/annales/22/7/2625.htm?FrameEngine=false;
XMM-Newton observations of three short-period polars: V347 Pav, GG Leo and EU UMa
Cropper, Mark; Ramsay, Gavin; Priedhorsky, W. +2 more
We present phase-resolved XMM-Newton data of three short-period polars: V347 Pav, GG Leo and EU UMa. All three systems show one dominant accretion region, which is seen for approximately half the orbital cycle. GG Leo shows a strong dip feature in its X-ray and ultraviolet (UV) light curves, which is due to absorption of X-rays from the accretion …