Very long baseline array observations of the Zeeman effect in H2O masers in W3 IRS 5

A. P. Sarma; T. H. Troland; J. D. Romney

doi:10.1086/321705

Very long baseline array observations of the Zeeman effect in H₂O masers in W3 IRS 5

A. P. Sarma
, T. H. Troland
, J. D. Romney

Physics And Astronomy

Producción científica: Article › revisión exhaustiva

39 Citas (Scopus)

Resumen

We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H₂O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect - masers for which we can independently measure the magnetic field are separated by ≤25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H₂O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.

Idioma original	English
Páginas (desde-hasta)	L217-L220
Publicación	Astrophysical Journal
Volumen	554
N.º	2 PART 2
DOI	https://doi.org/10.1086/321705
Estado	Published - jun 20 2001

Nota bibliográfica

Funding Information:
4The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Financiación

4The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Financiadores	Número del financiador
National Science Foundation (NSF)	AST 99-88341
National Aeronautics and Space Administration
University of Kentucky

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/321705

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title = "Very long baseline array observations of the Zeeman effect in H2O masers in W3 IRS 5",

abstract = "We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H2O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect - masers for which we can independently measure the magnetic field are separated by ≤25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H2O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.",

keywords = "ISM: clouds, ISM: magnetic fields, Masers, Polarization, Radio lines: ISM",

author = "Sarma, \{A. P.\} and Troland, \{T. H.\} and Romney, \{J. D.\}",

note = "Funding Information: 4The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.",

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doi = "10.1086/321705",

language = "English",

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T1 - Very long baseline array observations of the Zeeman effect in H2O masers in W3 IRS 5

AU - Sarma, A. P.

AU - Troland, T. H.

AU - Romney, J. D.

N1 - Funding Information: 4The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

PY - 2001/6/20

Y1 - 2001/6/20

N2 - We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H2O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect - masers for which we can independently measure the magnetic field are separated by ≤25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H2O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.

AB - We present Very Long Baseline Array (VLBA) observations of the Zeeman effect in H2O masers in W3 IRS 5. These observations have yielded the first ultrahigh spatial resolution maps of the magnetic field in a star-forming region measured via the Zeeman effect - masers for which we can independently measure the magnetic field are separated by ≤25 mas (60 AU). This is the first VLBA detection of the Zeeman effect in H2O masers in a star-forming region. These observations also remove the confusion in observed magnetic fields from closely spaced masers. We shall explicitly demonstrate that observations at lower resolution can yield lower magnetic fields than with the VLBA, even though there are no field reversals within the larger beam.

KW - ISM: clouds

KW - ISM: magnetic fields

KW - Masers

KW - Polarization

KW - Radio lines: ISM

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