Vertical Distribution and Kinematics of Planetary Nebulae in the Milky Way

Abstract

Based on published data, we have produced a sample of planetary nebulae (PNe) that is complete within 2 kpc of the Sun. We have estimated the total number of PNe in the Galaxy from this sample to be 17000+/-3000 and determined the vertical scale height of the thin disk based on an exponential density distribution to be 197+/-10 pc. The next sample includes PNe from the Stanghellini-Haywood catalog with minor additions. For this purpose, we have used about 200 PNe with Peimbert's types I, II, and III. In this case, we have obtained a considerably higher value of the vertical scale height that increases noticeably with sample radius. We have experimentally found that it is necessary to reduce the distance scale of this catalog approximately by 20%. Then, for example, for PNe with heliocentric distances less than 4 kpc the vertical scale height is 256+/-12 kpc. A kinematic analysis has confirmed the necessity of such a reduction of the distance scale.

16 pqges, 6 figures, 2 tables

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Cited by in corpus (5)

• Recent advances in the determination of some Galactic constants in the Milky Way
• Planetary Nebula Luminosity Function distances for 19 galaxies observed by PHANGS-MUSE
• Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy
• Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue
• Modeling the vertical distribution of the Milky Way's flat subsystem objects