Stripping of a planetary nebula from the globular cluster M22

Kazimierz J. Borkowski; Zlatan Tsvetanov; J. Patrick Harrington

doi:10.1086/186699

Stripping of a planetary nebula from the globular cluster M22

Kazimierz J. Borkowski^*, Zlatan Tsvetanov, J. Patrick Harrington

^*Corresponding author for this work

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

21 Citations (Scopus)

Abstract

High-spatial resolution imaging in the [O III] λ5007 line of a planetary nebula (PN) in the globular cluster M22 reveals a strongly asymmetric (half-moon shaped) nebular morphology. We confirm that this peculiar morphology is caused by the distortion of stellar ejecta by the ram pressure of the ambient interstellar medium (ISM) through which the cluster is moving with a high velocity of 200 km s^-1. Emission knots visible in the leading (upstream) nebular section confirm theoretical expectations that the shell should have been fragmented by the Rayleigh-Taylor instability. Stripping of the PN from M22 by the ambient ISM is the first direct evidence for removal of gas from globular clusters. M22 is at a favorable location for the ram-pressure stripping to be effective, only 400 pc below the Galactic plane, well within a 2 kpc thick layer of ionized gas enveloping the plane. Ionized (or possibly neutral) gas in this layer, with a hydrogen density of ∼0.1 cm^-3, is responsible for the observed interaction.

Original language	English
Pages (from-to)	L57-L60
Journal	Astrophysical Journal
Volume	402
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/186699
Publication status	Published - 10 Jan 1993
Externally published	Yes

Keywords

Globular clusters individual (M22)
Hydrodynamics
Planetary nebulae: individual (IRAS 18333-2357)

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title = "Stripping of a planetary nebula from the globular cluster M22",

abstract = "High-spatial resolution imaging in the [O III] λ5007 line of a planetary nebula (PN) in the globular cluster M22 reveals a strongly asymmetric (half-moon shaped) nebular morphology. We confirm that this peculiar morphology is caused by the distortion of stellar ejecta by the ram pressure of the ambient interstellar medium (ISM) through which the cluster is moving with a high velocity of 200 km s-1. Emission knots visible in the leading (upstream) nebular section confirm theoretical expectations that the shell should have been fragmented by the Rayleigh-Taylor instability. Stripping of the PN from M22 by the ambient ISM is the first direct evidence for removal of gas from globular clusters. M22 is at a favorable location for the ram-pressure stripping to be effective, only 400 pc below the Galactic plane, well within a 2 kpc thick layer of ionized gas enveloping the plane. Ionized (or possibly neutral) gas in this layer, with a hydrogen density of ∼0.1 cm-3, is responsible for the observed interaction.",

keywords = "Globular clusters individual (M22), Hydrodynamics, Planetary nebulae: individual (IRAS 18333-2357)",

author = "Borkowski, {Kazimierz J.} and Zlatan Tsvetanov and Harrington, {J. Patrick}",

year = "1993",

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doi = "10.1086/186699",

language = "English",

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AU - Borkowski, Kazimierz J.

AU - Tsvetanov, Zlatan

AU - Harrington, J. Patrick

PY - 1993/1/10

Y1 - 1993/1/10

N2 - High-spatial resolution imaging in the [O III] λ5007 line of a planetary nebula (PN) in the globular cluster M22 reveals a strongly asymmetric (half-moon shaped) nebular morphology. We confirm that this peculiar morphology is caused by the distortion of stellar ejecta by the ram pressure of the ambient interstellar medium (ISM) through which the cluster is moving with a high velocity of 200 km s-1. Emission knots visible in the leading (upstream) nebular section confirm theoretical expectations that the shell should have been fragmented by the Rayleigh-Taylor instability. Stripping of the PN from M22 by the ambient ISM is the first direct evidence for removal of gas from globular clusters. M22 is at a favorable location for the ram-pressure stripping to be effective, only 400 pc below the Galactic plane, well within a 2 kpc thick layer of ionized gas enveloping the plane. Ionized (or possibly neutral) gas in this layer, with a hydrogen density of ∼0.1 cm-3, is responsible for the observed interaction.

AB - High-spatial resolution imaging in the [O III] λ5007 line of a planetary nebula (PN) in the globular cluster M22 reveals a strongly asymmetric (half-moon shaped) nebular morphology. We confirm that this peculiar morphology is caused by the distortion of stellar ejecta by the ram pressure of the ambient interstellar medium (ISM) through which the cluster is moving with a high velocity of 200 km s-1. Emission knots visible in the leading (upstream) nebular section confirm theoretical expectations that the shell should have been fragmented by the Rayleigh-Taylor instability. Stripping of the PN from M22 by the ambient ISM is the first direct evidence for removal of gas from globular clusters. M22 is at a favorable location for the ram-pressure stripping to be effective, only 400 pc below the Galactic plane, well within a 2 kpc thick layer of ionized gas enveloping the plane. Ionized (or possibly neutral) gas in this layer, with a hydrogen density of ∼0.1 cm-3, is responsible for the observed interaction.

KW - Globular clusters individual (M22)

KW - Hydrodynamics

KW - Planetary nebulae: individual (IRAS 18333-2357)

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SP - L57-L60

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

Stripping of a planetary nebula from the globular cluster M22

Abstract

Keywords

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