2002MNRAS.331....7S

Query : 2002MNRAS.331....7S

2002MNRAS.331....7S - Mon. Not. R. Astron. Soc., 331, 7-12 (2002/March-3)

Near-infrared and optical emission-line structure of the Keyhole Nebula in NGC 3372.

SMITH N.

Abstract (from CDS):

Narrow-band infrared and optical images of the Keyhole Nebula in NGC 3372 reveal which structures are caused by extinction, and show the underlying morphology of photoionized and shock-excited gas. Dark clouds conspire with ionized gas to create the apparent keyhole shape, which is prominent at blue wavelengths and less apparent in the infrared. The Paβ/Hα line ratio shows the spatial distribution of foreground extinction. The wavelength dependence of this extinction indicates a reddening law with R ~4.8, different from the normal interstellar medium. This confirms previous estimates of reddening toward the Carina Nebula determined from stellar photometry, and reveals that the anomalous extinction is patchy and within the Hii region. The morphology of the ionized gas is different from the extinction clouds; it shows an edge-on ionization front running NE to SW, with a limb-brightened indentation that forms the upper outline of the keyhole shape. A fast polar wind from η Carinae may have punctured the ionization front, since the indentation is directly along a projection of the polar axis of the star. This is supported by the morphology of shock-excited gas revealed by a high [Sii]/Hα ratio. High-excitation gas emitting [Oiii] and Hei has a smoother distribution. Molecular clumps in the region are also discussed.

Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): stars: formation - dust, extinction - Hii regions - ISM: individual: Keyhole Nebula - infrared: ISM

Nomenclature: Fig.2: [CB95] N (No. 6) added.

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 75223 * 08 47 21.9725590104 -39 47 59.119125288   7.50 7.20     A1V 25 0
2 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
3 NAME Carina Defiant Finger Cld 10 44 31.2 -59 39 56           ~ 9 0
4 [BGN2005] J104433.2-593508 Cld 10 44 33.2 -59 35 08           ~ 2 0
5 [CB95] 5 Cld 10 44 42 -59 37.9           ~ 8 0
6 [CB95] 3 Cld 10 44 48 -59 41.8           ~ 3 0
7 [CB95] C Cld 10 44 50.2 -59 40 43           ~ 6 0
8 [BGN2005] J104451.2-593803 Cld 10 44 51.2 -59 38 03           ~ 7 0
9 [CB95] 1 Cld 10 44 53 -59 38.4           ~ 5 0
10 [CB95] 2 Cld 10 44 54 -59 39.2           ~ 5 0
11 [BGN2005] J104458.5-593739 Cld 10 44 58.5 -59 37 39           ~ 7 0
12 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
13 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
14 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
15 [CB95] B Cld 10 45 07.0 -59 39 15           ~ 6 0
16 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1

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