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18 papers · 1 filter
EXSdetect: an end-to-end software for extended source detection in X-ray images: application to Swift-XRT data
Teng Liu, Paolo Tozzi, Elena Tundo +4
Aims. We present a stand-alone software (named EXSdetect) for the detection of extended sources in X-ray images. Our goal is to provide a flexible tool capable of detecting extende…
Chandra Observations of the Collisional Ring Galaxy NGC 922
A. H. Prestwich, J. L. Galache. T. Linden, V. Kalogara +5
In this paper we report on Chandra observations of the starburst galaxy NGC 922. NGC 922 is a drop-through ring galaxy with an expanding ring of star formation, similar in many res…
GRBs have preferred jet opening angles and bulk Lorentz factors
G. Ghisellini, G. Ghirlanda, R. Salvaterra +7
We recently found that Gamma Ray Burst energies and luminosities, in their comoving frame, are remarkably similar. This, coupled with the clustering of energetics once corrected fo…
Measurement errors and scaling relations in astrophysics: a review
S. Andreon, M. A. Hurn
This review article considers some of the most common methods used in astronomy for regressing one quantity against another in order to estimate the model parameters or to predict…
Analysis of Spitzer-IRS spectra of hyperluminous infrared galaxies
A. Ruiz, G. Risaliti, E. Nardini +2
Hyperluminous infrared galaxies (HLIRG) are the most luminous persistent objects in the Universe. They exhibit extremely high star formation rates, and most of them seem to harbour…
X-ray evidence for ultra-fast outflows in local AGNs
F. Tombesi, M. Cappi, R. M. Sambruna +4
X-ray evidence for ultra-fast outflows (UFOs) has been recently reported in a number of local AGNs through the detection of blue-shifted Fe XXV/XXVI absorption lines. We present th…