The unusual morphology of molecular hydrogen emission in the planetary nebula J900

1995 ◽  
Vol 109 ◽  
pp. 1173 ◽  
Author(s):  
D. L. Shupe ◽  
L. Armus ◽  
K. Matthews ◽  
B. T. Soifer
Keyword(s):  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Hydrogen Emission

The Kinematics and Excitation of Molecular Hydrogen Emission in the Planetary Nebula BD +30o3639

1998 ◽  
Vol 498 (1) ◽  
pp. 267-277 ◽  
Author(s):  
D. L. Shupe ◽  
J. E. Larkin ◽  
R. A. Knop ◽  
L. Armus ◽  
K. Matthews ◽  
...  
Keyword(s):  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Hydrogen Emission

scholarly journals The Distribution of Molecular Hydrogen in Planetary Nebulae

1987 ◽  
Vol 120 ◽  
pp. 339-340
Author(s):  
J. W. V. Storey ◽  
B. L. Webster ◽  
P. Payne ◽  
M. A. Dopita
Keyword(s):  
Anisotropic Medium ◽  
Stellar Wind ◽  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Planetary Nebulae ◽  
Morphological Type ◽  
Hydrogen Emission

A correlation has been found between strong molecular hydrogen emission and the morphological type of a planetary nebula. Those with an equatorial toroid and bipolar extensions have H2 1−0 S(1) stronger than Brackett γ. H2 maps of several objects, and NGC 2346 in particular, are consistent with a fast stellar wind interacting with an anisotropic medium.

scholarly journals Molecular Hydrogen Emission from Cold Condensations in NGC 2440

1989 ◽  
Vol 131 ◽  
pp. 207-207
Author(s):  
N. K. Reay ◽  
N. A. Walton ◽  
P. D. Atherton
Keyword(s):  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Total Mass ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Line Emission ◽  
Central Star ◽  
Hydrogen Emission ◽  
H Ii Region ◽  
Hydrogen Mass

We report observations of the v = 1-0 S(1) line of molecular hydrogen in the high excitation Planetary Nebula NGC 2440. The emission is particularly strong at the positions of the two bright condensations which lie well within the H II region and close to the position of the very hot T = 350,000 K central star. The emission is consistent with an excited molecular hydrogen mass of 2–4 × 10−5 M⊙ in the condensations, and we estimate the total mass of excited molecular hydrogen associated with the H II region to be 6 × 10−3 M⊙. We show that the radiation pressure from the central star is insufficient to excite the S(1) line emission. We also show that a stellar wind driven shock would imply a mass loss rate of 3 × 10−7 M⊙ yr−1 if we adopt a wind velocity of 2000 km s−1.

Molecular Hydrogen Emission from the Cometary Globules in the Helix Nebula (NGC 7293)

2003 ◽  
Vol 209 ◽  
pp. 275-276
Author(s):  
J. R. Walsh ◽  
N. Ageorges
Keyword(s):  
Central Region ◽  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Direct Evidence ◽  
Central Star ◽  
Small Distance ◽  
Ionization Front ◽  
The Sun ◽  
Hydrogen Emission ◽  
High Ionization

The discovery of many dense, dusty condensations in the Helix Nebula, NGC 7293, by Meaburn et al. (1992) was the first direct evidence of the real inhomogeneity of the medium of a planetary nebula. On account of the small distance of the Helix nebula from the Sun (~200pc), the knots (cometary globules) can be resolved from the ground and studied in detail from HST imaging (O'Dell & Handron, 1996). The condensations typically have a projected diameter of <2″ and hence sizes of <6 x 1015 cm. The condensations consist of a dusty core, visible as absorption against the background high ionization central region of the nebula for the foreground globules, and with a bow-shaped ionization front, strong in low ionization emission. The emission is displaced in the direction towards the central star, often with an outwardly-directed radial tail.

Detection of fluorescent molecular hydrogen emission in the planetary nebula Hubble 12

1988 ◽  
Vol 327 ◽  
pp. L27 ◽  
Author(s):  
Harriet L. Dinerstein ◽  
Daniel F. Lester ◽  
John S. Carr ◽  
Paul M. Harvey
Keyword(s):  
Planetary Nebula ◽  
Molecular Hydrogen ◽  
Hydrogen Emission

scholarly journals Atomic hydrogen in the planetary nebula IC 4997

1987 ◽  
Vol 122 ◽  
pp. 501-502
Author(s):  
C. Giovanardi ◽  
D.R. Altschuler ◽  
S.E. Schneider ◽  
P.R. Silverglate
Keyword(s):  
Atomic Hydrogen ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Expansion Velocity ◽  
Hydrogen Emission

In the course of a sensitive search for atomic hydrogen emission associated with planetary nebulae having high velocities relative to Galactic HI (Schneider et al. 1986), we detected absorption in the spectrum of IC 4997 (PK 58-10.1). This is only the second definite detection of HI associated with a PN. The velocity of the feature coincides precisely with that expected if the gas is expanding with the measured optical expansion velocity of 14 km s−1 (Sabbadin 1984), strongly suggesting an association.

scholarly journals ULTRALUMINOUS STAR-FORMING GALAXIES AND EXTREMELY LUMINOUS WARM MOLECULAR HYDROGEN EMISSION ATz= 2.16 IN THE PKS 1138–26 RADIO GALAXY PROTOCLUSTER

2012 ◽  
Vol 751 (1) ◽  
pp. 13 ◽  
Author(s):  
P. Ogle ◽  
J. E. Davies ◽  
P. N. Appleton ◽  
B. Bertincourt ◽  
N. Seymour ◽  
...  
Keyword(s):  
Molecular Hydrogen ◽  
Radio Galaxy ◽  
Star Forming ◽  
Hydrogen Emission

The Onset of Molecular Hydrogen Emission from Proto–planetary Nebulae

1998 ◽  
Vol 509 (2) ◽  
pp. 728-732 ◽  
Author(s):  
David A. Weintraub ◽  
Tracy Huard ◽  
Joel H. Kastner ◽  
Ian Gatley
Keyword(s):  
Molecular Hydrogen ◽  
Planetary Nebulae ◽  
Hydrogen Emission

Ultraviolet fluorescent molecular hydrogen emission

1989 ◽  
Vol 347 ◽  
pp. 863 ◽  
Author(s):  
Amiel Sternberg
Keyword(s):  
Molecular Hydrogen ◽  
Hydrogen Emission

Infrared images of ionized and molecular hydrogen emission in S106

1990 ◽  
Vol 354 ◽  
pp. 242 ◽  
Author(s):  
Saeko S. Hayashi ◽  
Tetsuo Hasegawa ◽  
Masuo Tanaka ◽  
Masahiko Hayashi ◽  
Colin Aspin ◽  
...  
Keyword(s):  
Molecular Hydrogen ◽  
Infrared Images ◽  
Hydrogen Emission
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