Chandra observations of the planetary nebula IC4593

J. A. Toalá*, M. A. Guerrero, L. Bianchi, Y. H. Chu, O. De Marco

*Corresponding author for this work

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The Advanced CCD Imaging Spectrometer (ACIS-S) camera on board the Chandra X-ray Observatory has been used to discover a hot bubble in the planetary nebula (PN) IC 4593, the most distant PN detected by Chandra so far. The data are used to study the distribution of the X-ray-emitting gas in IC 4593 and to estimate its physical properties. The hot bubble has a radius of ~2 arcsec and is found to be confined inside the optically bright innermost cavity of IC 4593. The X-ray emission is mostly consistent with that of an optically thin plasma with temperature kT ≈0.15 keV (or TX ≈1.7 × 106 K), electron density ne ≈15 cm-3, and intrinsic X-ray luminosity in the 0.3-1.5 keV energy range LX = 3.4 × 1030 erg s-1. A careful analysis of the distribution of hard (E >0.8 keV) photons in IC 4593 suggests the presence of X-ray emission from a point source likely associated with its central star (CSPN). If this was the case, its estimated X-ray luminosity would be LX, CSPN = 7 × 1029 erg s-1, fulfilling the log(LX, CSPN/Lbol)≈-7 relation for self-shocking winds in hot stars. The X-ray detection of the CSPN helps explain the presence of high-ionization species detected in the ultraviolet spectra as predicted by stellar atmosphere models.

Original languageEnglish
Pages (from-to)3784-3789
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - May 2020

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 3, May 2020, Pages 3784–3789, Copyright 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


  • Planetary nebulae: general
  • Planetary nebulae: IC 4593
  • Stars: low-mass
  • Stars: winds, outflows
  • X-rays: general


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