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AGN activity and the misaligned hot ISM in the compact radio elliptical NGC4278
(2012-10-20)
The analysis of a deep (579ks) Chandra ACIS pointing of the elliptical galaxy NGC4278, which hosts a low-luminosity active galactic nucleus (AGN) and compact radio emission, allowed us to detect extended emission from hot ...
The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies
(2012-08-20)
We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, ...
Transient Low-mass X-ray Binary Populations in Elliptical Galaxies NGC 3379 and NGC 4278
(2009-09-01)
We propose a physically motivated and self-consistent prescription for the modeling of transient neutron star low-mass X-ray binary (LMXB) properties, such as duty cycle (DC), outburst duration, and recurrence time. We ...
Comparing GC and Field LMXBs in elliptical galaxies with Deep Chandra and Hubble Data
(2009-09-01)
We present a statistical study of the low-mass X-ray binary (LMXB) populations of three nearby, old elliptical galaxies: NGC 3379, NGC 4278, and NGC 4697. With a cumulative ~1 Ms Chandra ACIS observing time, we detect ...
Deep Chandra Monitoring Observations of NGC 4278 : Catalog of Source Properties
(2009-04-01)
We present the properties of the discrete X-ray sources detected in our monitoring program of the globular cluster (GC) rich elliptical galaxy, NGC 4278, observed with Chandra ACIS-S in six separate pointings, resulting ...
Discovery of Hot Gas in Outflow in NGC 3379
(2008-12-01)
We report the discovery of a faint (LX~4+/-1.5×1037 ergs s-1, 0.5-2 keV), outflowing gaseous hot interstellar medium (ISM) in NGC 3379. This represents the lowest X-ray luminosity ever measured from a hot phase of the ISM ...
Deep Chandra Monitoring Observations of NGC 3379 : Catalog of Source Properties
(2008-11-01)
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 separate pointings, resulting in a co-added ...
Models for Low-Mass X-Ray Binaries in the Elliptical Galaxies NGC 3379 and NGC 4278 : Comparison with Observations
(2008-08-01)
We present theoretical models for the formation and evolution of populations of low-mass X-ray binaries (LMXBs) in the two elliptical galaxies NGC 3379 and NGC 4278. The models are calculated with the recently updated ...