2023/09/12 by Roberto Serafinelli, Andrea Marinucci, Serafinelli, Roberto +27
Decision Sciences · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Scientific Measurement and Uncertainty Evaluation
paper · pdf · doi:10.48550/arxiv.2309.06092
openalex publication_date 2023/09/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
MCG-5-23-16 is a Seyfert 1.9 galaxy at redshift z=0.00849. We analyse here the X-ray spectra obtained with XMM-Newton and NuSTAR data, which are the first contemporaneous observations with these two X-ray telescopes. Two reflection features, producing a narrow core and a broad component of the Fe Kα, are clearly detected in the data. The analysis of the broad iron line shows evidence of a truncated disc with inner radius R\rm in=40+23-16 Rg and an inclination of 41+9-10 ^∘. The high quality of the NuSTAR observations allows us to measure a high energy cut-off at E\rm cut=131+10-9 keV. We also analyse the RGS spectrum, finding that the soft X-ray emission is produced by two photoionised plasma emission regions, with different ionisation parameters and similar column densities. Remarkably, the source only shows moderate continuum flux variability, keeping the spectral shape roughly constant in a time scale of ∼20 years.