Giuseppina Fabbiano

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We have analyzed an XMM-Newton observation of the nearby spiral galaxy NGC 1313, which contains two " ultra-luminous " X-ray (ULX) sources. We measure isotropic luminosities of L X = 2.0 × 10 40 erg s −1 and L X = 6.6 × 10 39 erg s −1 for NGC 1313 X-1 and X-2 (0.2-10.0 keV, assuming a distance of 3.7 Mpc). The spectra statistically require soft and hard(More)
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 statistical confidence (from > 20σ for the strongest to ∼ 4σ for the weakest) in two XMM-Newton observations 60 ksec long. We also detect the same lines, with lower signal-to-noise (but(More)
Based on our long (∼ 300 ks) 2007 XMM-Newton observation of the Seyfert galaxy NGC 1365, we report here on the spectral and timing behaviour of two ultraluminous X-ray sources, which had previously reached isotropic X-ray luminosities L X ≈ 4 × 10 40 erg s −1 (0.3–10 keV band). In 2007, they were in a lower state (L X ≈ 5 × 10 39 erg s −1 , and L X ≈ 1.5 ×(More)
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 to Compton-thin in four days) has been caught in a ten days Chandra monitoring campaign consisting of six short (15 ks) observations performed every two days. We discuss the(More)
We present the integrated 411 ks Chandra ACIS-S exposure of the Antennae galaxies (NGC 4038/39). Besides a rich population of point-like sources, this spectacular image reveals a spatially and spectrally complex hot diffuse gaseous component. For the first time we detect intense line emission from Fe, Ne, Mg and Si in The Antennae, and obtain a detailed(More)
We report the spectral and temporal variability properties of 18 candidate transient and potential transient (TC and PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC 3379, NGC 4278 and NGC 4697. Only one source can be identified with a background counterpart, leaving 17 TCs + PTCs in the galaxies. Of(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT The Chandra Source Catalog (CSC) is a general purpose virtual X-ray(More)
We report the detailed analysis of the X-ray properties of the discrete sources detected in a long (72 ks) Chandra ACIS-S observation of the Antennae galaxies. We detect 49 sources, down to a detection limit of ∼ 10 38 erg s −1 ; 18 sources have L X > 10 39 erg s −1 (Ultra Luminous X-ray sources; ULXs). Six of the 49 sources have an extended component. Two(More)