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Chandra discovery of activity in the quiescent nuclear black hole of NGC821
A. Baldi, G. Fabbiano, S. Pellegrini +4
We report the results of the Chandra ACIS-S observations of the elliptical galaxy NGC 821, which harbors a supermassive nuclear black hole (of 3.5x10^7 solar masses), but does not…
The Ionized Nuclear Environment in NGC 985 as seen by Chandra and BeppoSAX
Y. Krongold, F. Nicastro, M. Elvis +3
(Abridged) We investigate the ionized environment of the Seyfert 1 galaxy NGC 985 with a new Chandra-HETGS observation and an archival BeppoSAX observation. Two absorption componen…
High Resolution Imaging of the HeII lambda 4686 Emission Line Nebula Associated with the Ultraluminous X-Ray Source in Holmberg II
P. Kaaret, M. J. Ward, A. Zezas
We present Hubble Space Telescope images of the He{\sc iii} region surrounding the bright X-ray source in the dwarf irregular galaxy Holmberg II. Using {\it Chandra}, we find a pos…
X-ray luminous galaxies II. Chandra and XMM-Newton Observations of the 'composite' galaxy IRAS20051-1117
I. Georgantopoulos, I. Papadakis, A. Zezas +1
We present Chandra and XMM-Newton observations of the composite star-forming/Seyfert galaxy IRAS20051-1117. The X-ray imaging and spectral properties reveal the presence of an acti…
Chandra's Discovery of Activity in the Quiescent Nuclear Black Hole of NGC 821
G. Fabbiano, A. Baldi, S. Pellegrini +4
We report the results of the {\it Chandra} ACIS-S observations of the elliptical galaxy NGC 821, which harbors a supermassive nuclear black hole (of ), b…
X-raying Chemical Evolution and Galaxy Formation in The Antennae
G. Fabbiano, A. Baldi, A. R. King +6
We present the integrated 411 ks {\it Chandra} ACIS-S exposure of the Antennae galaxies (NGC 4038/39). Besides a rich population of point-like sources, this spectacular image revea…