A remarkable feature in the giant extragalactic H II region NGC 5471

Hector O. Castañeda; J. M. Vilchez; Marcus V.F. Copetti

doi:10.1086/169466

A remarkable feature in the giant extragalactic H II region NGC 5471

Hector O. Castañeda, J. M. Vilchez, Marcus V.F. Copetti

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Abstract

We report the discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471. A broad component in the emission lines of Hα + [N II] λλ6548, 6584 is located within an area less than 1″ in diameter at the position known as knot C. The broad component is characterized by its low intensity (less than 2% of the peak surface brightness in Hα), a contribution of ≈25% to the total flux of the lines, and an extension of ≈3300 km s^-1 at full width at zero intensity (FWZI). Supernovae explosions and stellar winds are considered as possible sources of the gas motions, and the observational evidence for their presence is discussed.

Original language	English
Pages (from-to)	164-167
Number of pages	4
Journal	Astrophysical Journal
Volume	365
Issue number	1
DOIs	https://doi.org/10.1086/169466
State	Published - 10 Dec 1990
Externally published	Yes

Keywords

Galaxies: individual (NGC 5471)
Galaxies: interstellar matter
Nebulae: H II regions
Nebulae: internal motions

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10.1086/169466

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title = "A remarkable feature in the giant extragalactic H II region NGC 5471",

abstract = "We report the discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471. A broad component in the emission lines of Hα + [N II] λλ6548, 6584 is located within an area less than 1″ in diameter at the position known as knot C. The broad component is characterized by its low intensity (less than 2% of the peak surface brightness in Hα), a contribution of ≈25% to the total flux of the lines, and an extension of ≈3300 km s-1 at full width at zero intensity (FWZI). Supernovae explosions and stellar winds are considered as possible sources of the gas motions, and the observational evidence for their presence is discussed.",

keywords = "Galaxies: individual (NGC 5471), Galaxies: interstellar matter, Nebulae: H II regions, Nebulae: internal motions",

author = "Casta{\~n}eda, {Hector O.} and Vilchez, {J. M.} and Copetti, {Marcus V.F.}",

year = "1990",

month = dec,

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doi = "10.1086/169466",

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pages = "164--167",

journal = "Astrophysical Journal",

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T1 - A remarkable feature in the giant extragalactic H II region NGC 5471

AU - Castañeda, Hector O.

AU - Vilchez, J. M.

AU - Copetti, Marcus V.F.

PY - 1990/12/10

Y1 - 1990/12/10

N2 - We report the discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471. A broad component in the emission lines of Hα + [N II] λλ6548, 6584 is located within an area less than 1″ in diameter at the position known as knot C. The broad component is characterized by its low intensity (less than 2% of the peak surface brightness in Hα), a contribution of ≈25% to the total flux of the lines, and an extension of ≈3300 km s-1 at full width at zero intensity (FWZI). Supernovae explosions and stellar winds are considered as possible sources of the gas motions, and the observational evidence for their presence is discussed.

AB - We report the discovery of a very high velocity, low-intensity gas feature in the giant extragalactic H II region NGC 5471. A broad component in the emission lines of Hα + [N II] λλ6548, 6584 is located within an area less than 1″ in diameter at the position known as knot C. The broad component is characterized by its low intensity (less than 2% of the peak surface brightness in Hα), a contribution of ≈25% to the total flux of the lines, and an extension of ≈3300 km s-1 at full width at zero intensity (FWZI). Supernovae explosions and stellar winds are considered as possible sources of the gas motions, and the observational evidence for their presence is discussed.

KW - Galaxies: individual (NGC 5471)

KW - Galaxies: interstellar matter

KW - Nebulae: H II regions

KW - Nebulae: internal motions

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U2 - 10.1086/169466

DO - 10.1086/169466

M3 - Artículo

SN - 0004-637X

VL - 365

SP - 164

EP - 167

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

A remarkable feature in the giant extragalactic H II region NGC 5471

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