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The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source
G. Risaliti, M. Salvati, M. Elvis +10
We present an analysis of the extreme obscuration variability observed during an XMM-Newton 5-days continuous monitoring of the AGN in NGC 1365. The source was in a reflection-domi…
Discovery of Hot Gas in Outflow in NGC3379
G. Trinchieri, S. Pellegrini, G. Fabbiano +10
We report the discovery of a faint (L_x ~ 4 10^37 erg/s, 0.5-2 keV), out-flowing gaseous hot interstellar medium (ISM) in NGC 3379. This represents the lowest X-ray luminosity ever…
Models for Low-Mass X-Ray Binaries in the Elliptical Galaxies NGC3379 and NGC4278: Comparison with Observations
T. Fragos, V. Kalogera, K. Belczynski +11
We present theoretical models for the formation and evolution of populations of low-mass X-ray binaries (LMXB) in the two elliptical galaxies NGC 3379 and NGC 4278. The models are…
X-ray Observations of Galaxies: The Importance of Deep High-Resolution Observations
G. Fabbiano
X-ray observations of galaxies have grown from a curiosity into a full-fledged field of astronomy. These observations provide unique information on black holes, binary stars, and t…
Deep Chandra Monitoring Observations of NGC 3379: Catalog of Source Properties
N. J. Brassington, G. Fabbiano, D. -W. Kim +11
We present the properties of the discrete X-ray sources detected in our monitoring program of the `typical' elliptical galaxy, NGC 3379, observed with Chandra ACIS-S in five separa…
The X-ray binary population in M33: II. X-ray spectra and variability
H. -J. Grimm, J. McDowell, A. Zezas +2
In this paper we investigate the X-ray spectra and X-ray spectral variability of compact X-ray sources for 3 Chandra observations of the Local Group galaxy M33. The observations ar…
X-ray Tail in NGC 7619
Dong-Woo Kim, Eunhyeuk Kim, Giuseppina Fabbiano +1
We present new observational results of NGC 7619, an elliptical galaxy with a prominent X-ray tail and a dominant member of the Pegasus group. With Chandra and XMM-Newton observati…
New flaring of an ultraluminous X-ray source in NGC 1365
R. Soria, A. Baldi, G. Risaliti +4
We have studied a highly variable ultraluminous X-ray source (ULX) in the Fornax galaxy NGC 1365, with a series of 12 Chandra and XMM-Newton observations between 2002 and 2006. In…
Occultation measurement of the size of the X-ray emitting region in the Active Galactic Nucleus of NGC 1365
G. Risaliti, M. Elvis, G. Fabbiano +3
We present an occultation of the central X-ray emitting region in the Seyfert Galaxy NGC 1365. This extreme spectral variation (from Compton-thin to reflection-dominated and back t…
A deep Chandra, VLA and Spitzer IRAC study of the very low luminosity nucleus of the elliptical NGC821
S. Pellegrini, A. Siemiginowska, G. Fabbiano +5
The relatively nearby (distance=24.1 Mpc) elliptical galaxy NGC821 hosts an extreme example of a quiescent central massive black hole, for which deep Chandra observations revealed…
A deep Chandra look at the low L_B elliptical NGC821: X-ray binaries, a galactic wind and emission at the nucleus
S. Pellegrini, A. Baldi, D. W. Kim +4
The relatively nearby (distance=24.1 Mpc) elliptical galaxy NGC821, hosting a central massive black hole but inactive at all wavelengths, was observed with Chandra for a total expo…
Neutron Stars and Black Holes in Star Clusters
F. A. Rasio, H. Baumgardt, A. Corongiu +10
This article was co-authored by all invited speakers at the Joint Discussion on `Neutron Stars and Black Holes in Star Clusters,' which took place during the IAU General Assembly i…
Probing the Low-Luminosity XLF in Normal Elliptical Galaxies
D. -W. Kim, G. Fabbiano, V. Kalogera +8
We present the first low luminosity (LX > 5 - 10 1036 erg s-1) X-ray luminosity functions (XLFs) of low-mass X-ray binaries (LMXBs) determined for two typical old elliptical galaxi…
The Eclipsing ULX in NGC 3379
G. Fabbiano, D. -W. Kim, T. Fragos +9
We report recent Chandra observations of the ULX in the elliptical galaxy NGC3379 that clearly detect two flux variability cycles. Comparing these data with the Chandra observation…
X-ray source populations in galaxies
G. Fabbiano
Today's sensitive, high-resolution X-ray observations allow the study of populations of X-ray sources, in the luminosity range of Galactic X-ray binaries, in galaxies as distant as…
Accretion and nuclear activity of quiescent supermassive black holes. II: optical study and interpretation
Roberto Soria, Alister W. Graham, Giuseppina Fabbiano +5
Our X-ray study of the nuclear activity in a new sample of six quiescent early-type galaxies, and in a larger sample from the literature, confirmed (Soria et al., Paper I) that the…
Accretion and nuclear activity of quiescent supermassive black holes. I: X-ray study
Roberto Soria, Giuseppina Fabbiano, Alister W. Graham +5
We have studied the nuclear activity in a sample of six quiescent early-type galaxies, with new Chandra data and archival HST optical images. Their nuclear sources have X-ray lumin…
Investigating Galaxy Evolution with Chandra
G. Fabbiano
Chandra observations show the importance of the X-ray band for studying the evolution of galaxies. Binary X-ray sources are an easily detectable tracer of the stellar population. C…
X-ray populations in galaxies
G. Fabbiano
Today's sensistive, high resolution Chandra X-ray observations allow the study of many populations of X-ray sources. The traditional astronomical tools of photometric diagrams and…
Low Mass X-ray Binaries in 6 Elliptical Galaxies: Connection to Globular Clusters
Eunhyeuk Kim, Dong-Woo Kim, Giuseppina Fabbiano +4
We present a systematic study of the low mass X-ray binary (LMXB) populations of 6 elliptical galaxies. We utilize Chandra archival data to identify 665 X-ray point sources and HST…
Chemical enrichment of the complex hot ISM of the Antennae Galaxies: II. Physical properties of the hot gas and supernova feedback
A. Baldi, J. C. Raymond, G. Fabbiano +5
We investigate the physical properties of the interstellar medium (ISM) in the merging pair of galaxies known as The Antennae (NGC 4038/39), using the deep coadded ~411 ks Chandra…
Highly ionized iron absorption lines from outflowing gas in the X-ray spectrum of NGC 1365
G. Risaliti, S. Bianchi, G. Matt +4
We present the discovery of four absorption lines in the X-ray spectrum of the Seyfert Galaxy NGC 1365, at energies between 6.7 and 8.3 keV. The lines are detected with high statis…
The X-ray binary population in M33: I. Source list and luminosity function
H. -J. Grimm, J. McDowell, A. Zezas +2
In this paper we present the source list for 3 Chandra observations of the Local Group galaxy M33. The observations are centered on the nucleus and on the star forming region NGC 6…
Extreme X-ray spectral variability in the Seyfert 2 Galaxy NGC 1365
G. Risaliti, M. Elvis, G. Fabbiano +2
We present multiple Chandra and XMM-Newton observations of the type 1.8 Seyfert Galaxy NGC 1365, which shows the most dramatic X-ray spectral changes observed so far in an AGN: the…