Discovery of extended X-ray emission from the planetary nebula NGC 7027 by the Chandra X-ray Observatory

Joel H. Kastner; Saeqa D. Vrtilek; Noam Soker

doi:10.1086/319651

Discovery of extended X-ray emission from the planetary nebula NGC 7027 by the Chandra X-ray Observatory

Joel H. Kastner^*, Saeqa D. Vrtilek, Noam Soker

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

We report the discovery of X-ray emission from NGC 7027, a prototypical object for the study of the formation and evolution of planetary nebulae. Observations with the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-Ray Observatory show that the X-ray emission from NGC 7027 is extended and is bipolar in morphology. The ACIS spectrum displays strong emission from highly ionized Ne and weaker emission features, which we attribute to O, Mg, and Si. Model fits to this spectrum suggest a characteristic temperature T_X ∼ 3 × 10⁶ K and an intrinsic (unabsorbed) X-ray luminosity of L_X ∼ 1.3 × 10³² ergs s^-1. The intranebular absorption of X-ray emission is highly nonuniform, but the modeling indicates an average column density N_H ∼ 6 × 10²¹ cm^-2, consistent with previous measurements of relatively large visual extinction within the nebula. We suggest that the X-ray emission from NGC 7027 is or was generated by a hitherto undetected fast wind from the central star of NGC 7027 or from a companion to this star. Chandra's detection of extended, high-temperature X-ray emission from BD +30°3639, NGC 6543, and now NGC 7027 suggests that such emission is a common feature of young planetary nebulae.

Original language	English
Pages (from-to)	L189-L192
Journal	Astrophysical Journal
Volume	550
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/319651
State	Published - 1 Apr 2001
Externally published	Yes

Keywords

Planetary nebulae: individual (NGC 7027)
Stars: mass loss
Stars: winds, outflows
X-rays: ISM

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@article{162e59626b7d4198a2ed8fec168a92d4,

title = "Discovery of extended X-ray emission from the planetary nebula NGC 7027 by the Chandra X-ray Observatory",

abstract = "We report the discovery of X-ray emission from NGC 7027, a prototypical object for the study of the formation and evolution of planetary nebulae. Observations with the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-Ray Observatory show that the X-ray emission from NGC 7027 is extended and is bipolar in morphology. The ACIS spectrum displays strong emission from highly ionized Ne and weaker emission features, which we attribute to O, Mg, and Si. Model fits to this spectrum suggest a characteristic temperature TX ∼ 3 × 106 K and an intrinsic (unabsorbed) X-ray luminosity of LX ∼ 1.3 × 1032 ergs s-1. The intranebular absorption of X-ray emission is highly nonuniform, but the modeling indicates an average column density NH ∼ 6 × 1021 cm-2, consistent with previous measurements of relatively large visual extinction within the nebula. We suggest that the X-ray emission from NGC 7027 is or was generated by a hitherto undetected fast wind from the central star of NGC 7027 or from a companion to this star. Chandra's detection of extended, high-temperature X-ray emission from BD +30°3639, NGC 6543, and now NGC 7027 suggests that such emission is a common feature of young planetary nebulae.",

keywords = "Planetary nebulae: individual (NGC 7027), Stars: mass loss, Stars: winds, outflows, X-rays: ISM",

author = "Kastner, {Joel H.} and Vrtilek, {Saeqa D.} and Noam Soker",

year = "2001",

month = apr,

day = "1",

doi = "10.1086/319651",

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T1 - Discovery of extended X-ray emission from the planetary nebula NGC 7027 by the Chandra X-ray Observatory

AU - Kastner, Joel H.

AU - Vrtilek, Saeqa D.

AU - Soker, Noam

PY - 2001/4/1

Y1 - 2001/4/1

N2 - We report the discovery of X-ray emission from NGC 7027, a prototypical object for the study of the formation and evolution of planetary nebulae. Observations with the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-Ray Observatory show that the X-ray emission from NGC 7027 is extended and is bipolar in morphology. The ACIS spectrum displays strong emission from highly ionized Ne and weaker emission features, which we attribute to O, Mg, and Si. Model fits to this spectrum suggest a characteristic temperature TX ∼ 3 × 106 K and an intrinsic (unabsorbed) X-ray luminosity of LX ∼ 1.3 × 1032 ergs s-1. The intranebular absorption of X-ray emission is highly nonuniform, but the modeling indicates an average column density NH ∼ 6 × 1021 cm-2, consistent with previous measurements of relatively large visual extinction within the nebula. We suggest that the X-ray emission from NGC 7027 is or was generated by a hitherto undetected fast wind from the central star of NGC 7027 or from a companion to this star. Chandra's detection of extended, high-temperature X-ray emission from BD +30°3639, NGC 6543, and now NGC 7027 suggests that such emission is a common feature of young planetary nebulae.

AB - We report the discovery of X-ray emission from NGC 7027, a prototypical object for the study of the formation and evolution of planetary nebulae. Observations with the Advanced CCD Imaging Spectrometer (ACIS) aboard the Chandra X-Ray Observatory show that the X-ray emission from NGC 7027 is extended and is bipolar in morphology. The ACIS spectrum displays strong emission from highly ionized Ne and weaker emission features, which we attribute to O, Mg, and Si. Model fits to this spectrum suggest a characteristic temperature TX ∼ 3 × 106 K and an intrinsic (unabsorbed) X-ray luminosity of LX ∼ 1.3 × 1032 ergs s-1. The intranebular absorption of X-ray emission is highly nonuniform, but the modeling indicates an average column density NH ∼ 6 × 1021 cm-2, consistent with previous measurements of relatively large visual extinction within the nebula. We suggest that the X-ray emission from NGC 7027 is or was generated by a hitherto undetected fast wind from the central star of NGC 7027 or from a companion to this star. Chandra's detection of extended, high-temperature X-ray emission from BD +30°3639, NGC 6543, and now NGC 7027 suggests that such emission is a common feature of young planetary nebulae.

KW - Planetary nebulae: individual (NGC 7027)

KW - Stars: mass loss

KW - Stars: winds, outflows

KW - X-rays: ISM

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