Oh (1720 MHz) masers and mixed-morphology supernova remnants

F. Yusef-Zadeh; M. Wardle; J. Rho; M. Sakano

doi:10.1086/345932

Oh (1720 MHz) masers and mixed-morphology supernova remnants

F. Yusef-Zadeh^*, M. Wardle, J. Rho, M. Sakano

^*Corresponding author for this work

Physics and Astronomy

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

79 Scopus citations

Abstract

Radio surveys of supernova remnants (SNRs) in the Galaxy have uncovered 19 SNRs accompanied by OH maser emission at 1720 MHz. This unusual class of maser sources is suggested to be produced behind a shock front from the expansion of a supernova remnant running into a molecular cloud. An important ingredient of this model is that X-ray emission from the remnant enhances the production of OH molecules. The role of X-ray emission from maser-emitting (ME) SNRs is investigated by comparing the X-ray-induced ionization rate with the theory. One aspect of this model is verified: there is a strong association between ME and mixed-morphology or thermal composite SNRs - center-filled thermal X-ray emission surrounded by shell-like radio morphology. We also present ROSAT and ASCA observations of two ME SNRs: G21.8-0.6 (Kes 69) and G357.7-0.1 (Tornado).

Original language	English (US)
Pages (from-to)	319-323
Number of pages	5
Journal	Astrophysical Journal
Volume	585
Issue number	1 I
DOIs	https://doi.org/10.1086/345932
State	Published - Mar 1 2003

Keywords

ISM: clouds
ISM: general
Shock waves
Supernova remnants
X-rays: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/345932

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title = "Oh (1720 MHz) masers and mixed-morphology supernova remnants",

abstract = "Radio surveys of supernova remnants (SNRs) in the Galaxy have uncovered 19 SNRs accompanied by OH maser emission at 1720 MHz. This unusual class of maser sources is suggested to be produced behind a shock front from the expansion of a supernova remnant running into a molecular cloud. An important ingredient of this model is that X-ray emission from the remnant enhances the production of OH molecules. The role of X-ray emission from maser-emitting (ME) SNRs is investigated by comparing the X-ray-induced ionization rate with the theory. One aspect of this model is verified: there is a strong association between ME and mixed-morphology or thermal composite SNRs - center-filled thermal X-ray emission surrounded by shell-like radio morphology. We also present ROSAT and ASCA observations of two ME SNRs: G21.8-0.6 (Kes 69) and G357.7-0.1 (Tornado).",

keywords = "ISM: clouds, ISM: general, Shock waves, Supernova remnants, X-rays: ISM",

author = "F. Yusef-Zadeh and M. Wardle and J. Rho and M. Sakano",

year = "2003",

month = mar,

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doi = "10.1086/345932",

language = "English (US)",

volume = "585",

pages = "319--323",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Oh (1720 MHz) masers and mixed-morphology supernova remnants

AU - Yusef-Zadeh, F.

AU - Wardle, M.

AU - Rho, J.

AU - Sakano, M.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - Radio surveys of supernova remnants (SNRs) in the Galaxy have uncovered 19 SNRs accompanied by OH maser emission at 1720 MHz. This unusual class of maser sources is suggested to be produced behind a shock front from the expansion of a supernova remnant running into a molecular cloud. An important ingredient of this model is that X-ray emission from the remnant enhances the production of OH molecules. The role of X-ray emission from maser-emitting (ME) SNRs is investigated by comparing the X-ray-induced ionization rate with the theory. One aspect of this model is verified: there is a strong association between ME and mixed-morphology or thermal composite SNRs - center-filled thermal X-ray emission surrounded by shell-like radio morphology. We also present ROSAT and ASCA observations of two ME SNRs: G21.8-0.6 (Kes 69) and G357.7-0.1 (Tornado).

AB - Radio surveys of supernova remnants (SNRs) in the Galaxy have uncovered 19 SNRs accompanied by OH maser emission at 1720 MHz. This unusual class of maser sources is suggested to be produced behind a shock front from the expansion of a supernova remnant running into a molecular cloud. An important ingredient of this model is that X-ray emission from the remnant enhances the production of OH molecules. The role of X-ray emission from maser-emitting (ME) SNRs is investigated by comparing the X-ray-induced ionization rate with the theory. One aspect of this model is verified: there is a strong association between ME and mixed-morphology or thermal composite SNRs - center-filled thermal X-ray emission surrounded by shell-like radio morphology. We also present ROSAT and ASCA observations of two ME SNRs: G21.8-0.6 (Kes 69) and G357.7-0.1 (Tornado).

KW - ISM: clouds

KW - ISM: general

KW - Shock waves

KW - Supernova remnants

KW - X-rays: ISM

UR - http://www.scopus.com/inward/record.url?scp=0041882011&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0041882011&partnerID=8YFLogxK

U2 - 10.1086/345932

DO - 10.1086/345932

M3 - Article

AN - SCOPUS:0041882011

SN - 0004-637X

VL - 585

SP - 319

EP - 323

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

Oh (1720 MHz) masers and mixed-morphology supernova remnants

Abstract

Keywords

ASJC Scopus subject areas

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