A Chandra Observation of the Nearby Sculptor Group Sd Galaxy NGC 7793
Thomas G. Pannuti, Eric M. Schlegel, Miroslav D. Filipovic, Jeffrey L., Payne, Robert Petre, Ilana M. Harrus, Wayne D. Staggs, Christina K. Lacey

TL;DR
This study presents a detailed Chandra X-ray analysis of NGC 7793, revealing 22 sources, including a ULX, with insights into their spectral properties, variability, and spatial distribution, enhancing understanding of X-ray populations in nearby galaxies.
Contribution
First detailed Chandra X-ray study of NGC 7793, identifying sources, analyzing spectra, variability, and spatial asymmetry, and comparing luminosity functions with other galaxies.
Findings
22 discrete X-ray sources detected, including one ULX.
Three sources show significant variability over time.
The galaxy's diffuse emission has a temperature of 0.19-0.25 keV.
Abstract
(Abridged) We conducted a Chandra ACIS observation of the nearby Sculptor Group Sd galaxy NGC 7793. At the assumed distance to NGC 7793 of 3.91 Mpc, the limiting unabsorbed luminosity of the detected discrete X-ray sources (0.2-10.0 keV) is approximately 3x10^36 ergs s^-1. A total of 22 discrete sources were detected at the 3-sigma level or greater including one ultra-luminous X-ray source (ULX). Based on multiwavelength comparisons, we identify X-ray sources coincident with one SNR, the candidate microquasar N7793-S26, one HII region and two foreground Galactic stars. We also find that the X-ray counterpart to the candidate radio SNR R3 is time-variable in its X-ray emission: we therefore rule out the possibility that this source is a single SNR. A marked asymmetry is seen in the distribution of the discrete sources with the majority lying in the eastern half of this galaxy. All of the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
