TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=0042309832&partnerID=8YFLogxK
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 -