Planetary Nebulae in the eROSITA eRASS1 catalog

Abstract

Some planetary nebulae (PNe) host X-ray-emitting hot bubbles shaped by stellar wind interactions and/or harbor X-ray-emitting central stars due to accretion, shocks within their fast stellar winds, or even chromospheric emission from binary companions. In both cases, the properties of the X-ray emission critically probe late-stages of stellar evolution for such low- and intermediate-mass stars. While extant Chandra and XMM-Newton observations have detected X-ray emission in PNe, the numbers known remain very small ($\sim 40$) compared to the overall Galactic PNe population ($\sim 4000$). We have initiated a project aimed at increasing the sample of known PNe with X-ray emission using both current and new space-based X-ray telescopes such as the Einstein probe. To further investigate their X-ray properties to elucidate what drives current X-ray PN detections, we have cross-searched the SRG {\it eROSITA-DE} eRASS1 source catalogue and Hong Kong (HASH) PNe Database. Five known X-ray PNe have been detected (Abell\,30, NGC\,2392, NGC\,3242, NGC\,5315, and LoTr\,5), two new X-ray PNe are revealed (IC\,1297 and NGC\,2867), one (K\,1-27) is removed from previous X-ray compilations, and another 11 previously detected X-ray emitting PNe are not recovered. A comparison of the X-ray flux of detected and undetected X-ray PNe reveals that eROSITA eRASS1 is sensitive to PNe with X-ray fluxes larger than $\approx 2\times 10^{-14}$ erg~cm${}^{-2}$~s${}^{-1}$. The frequency of occurrence is $\simeq$0.5\% among the 1430 HASH True PNe in the eRASS1 footprint.

Accepted by ApJ, 15 pages, 7 figures

References in corpus (16)

• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• The eROSITA X-ray telescope on SRG
• Second ROSAT all-sky survey (2RXS) source catalogue
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• The Einstein Probe Mission
• Scaling relations in fossil galaxy groups
• The Chandra Planetary Nebulae Survey (ChanPlaNS): III. X-ray Emission from the Central Stars of Planetary Nebulae
• The Chandra Planetary Nebula Survey (ChanPlaNS). II. X-ray Emission from Compact Planetary Nebulae
• Formation and X-ray Emission from Hot Bubbles in Planetary Nebulae. II. Hot bubble X-ray emission
• Estimate of the Background and Sensitivity of theFollow-up X-ray Telescope onboard Einstein Probe
• Abell 30 -- A Binary Central Star Among the Born-Again Planetary Nebulae
• Abundances of Planetary Nebulae NGC3242 and NGC6369
• UV spectral analysis of very hot H-deficient [WCE]-type central stars of planetary nebulae: NGC 2867, NGC 5189, NGC 6905, Pb 6, and Sand 3
• A new look inside Planetary Nebula LoTr 5: A long-period binary with hints of a possible third component
• The post-common-envelope X-ray binary nucleus of the planetary nebula NGC 2392
• A carbon-rich hot bubble in the planetary nebula NGC 5189