Browsing Articles by Subject "X-ray spectroscopy"

Now showing items 1-6 of 6

A coordinated X-ray and optical campaign of the nearest massive eclipsing binary, [delta] Orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground based) variations

Pablo, Herbert; Richardson, Noel D.; Moffat, Anthony F. J.; Corcoran, Michael; Shenar, Tomer; Benvenuto, Omar; Fuller, Jim; Naze, Yael; Hoffman, Jennifer L.; Miroshnichenko, Anatoly; Guenther, David B. (American Astronomical Society, 2015-08-20)

We report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system [delta] Ori A, consisting of a binary O9.5II+early-B ...
How well can we measure supermassive black hole spin?

Bonson, K.; Gallo, Luigi C. (Oxford University Press, 2016-05-11)

Being one of only two fundamental properties black holes possess, the spin of supermassive black holes (SMBHs) is of great interest for understanding accretion processes and galaxy evolution. However, in these early days ...
Multi-epoch X-ray observations of the Seyfert 1.2 galaxy Mrk 79: bulk motion of the illuminating X-ray source

Gallo, Luigi C.; Miniutti, G.; Miller, J. M.; Brenneman, L. W.; Fabian, A. C.; Guainazzi, M.; Reynolds, C. S. (Oxford University Press, 2011-02)

Multi-epoch X-ray spectroscopy (0.3–25 keV) of the Seyfert 1.2 galaxy Mrk 79 (UGC3973) spanning nearly 8 yr and a factor of 3 in broad-band flux are analysed. The data are obtained at seven epochs with either XMM–Newton ...
The nuclear environment of the NLS1 Mrk 335: Obscuration of the X-ray line emission by a variable outflow

Parker, M. L.; Longinotti, A. L.; Schartel, N.; Grupe, D.; Komossa, S.; Kriss, G.; Fabian, Andrew C.; Gallo, Luigi C.; Harrison, F. A.; Jiang, J.; Kara, E.; Krongold, Y.; Matzeu, G. A.; Pinto, C.; Santos-Lleo, M. (Royal Astronomical SocietyOxford University Press, 2019-09-12)

We present XMM–Newton, NuSTAR, Swift, and Hubble Space Telescope observations of the Narrow-line Seyfert 1 galaxy Mrk 335 in a protracted low state in 2018 and 2019. The X-ray flux ...
Solar abundance ratios of the iron-peak elements in the Perseus cluster

Hitomi Collaboration; Aharonian, F.; Akamatsu, H.; Akimoto, F.; Allen, S. W.; Angelini, L.; Audard, M.; Awaki, H.; Axelsson, M.; Bamba, A.; Bautz, M. W.; Gallo, Luigi C. (Springer Nature, 2017-11--2)

The metal abundance of the hot plasma that permeates galaxy clusters represents the accumulation of heavy elements produced by billions of supernovae¹. Therefore, X-ray spectroscopy of the intracluster medium ...
XMM-Newton observations of the narrow-line Seyfert 1 galaxy Mrk 335 in a historical low X-ray flux state

Gallo, Luigi C.; Grupe, Dirk; Komossa, Stefanie; Fabian, Andrew C.; Larsson, Josefin; Pradhan, Anil K.; Xu, Dawei; Miniutti, Giovanni (American Astronomical Society, 2008-07)

We report the discovery of strong soft X-ray emission lines and a hard continuum above 2 keV in the narrow-line Seyfert 1 galaxy Mrk 335 during an extremely low X-ray flux state. Mrk 335 was observed for 22 ks by XMM-Newton ...