SIMBAD references

2022AJ....164..106L - Astron. J., 164, 106 (2022/September-0)

Inhomogeneity within Local Interstellar Clouds.


Abstract (from CDS):

Analysis of interstellar absorption lines observed in high-resolution Hubble Space Telescope spectra of nearby stars provides temperatures, turbulent velocities, and kinetic properties of warm interstellar clouds. A new analysis of 97 interstellar-velocity components reveals a wide range of temperatures and turbulent velocities within the Local Interstellar Cloud (LIC) and the nearby Cluster of Interstellar Clouds (CLIC). These variations appear to be random with Gaussian distributions. We find no trends of these properties with stellar distance or angles from the Galactic Center, magnetic field, the main source of extreme-UV radiation (the star ϵ CMa), the center of the LIC, or the direction of inflowing interstellar matter into the heliosphere. The spatial scale for temperature variations in the LIC is likely smaller than 5100 au, a distance that the Sun will traverse in 1000 yr. Essentially all velocity components align with known warm clouds. We find that within 4 pc of the Sun, space is completely filled with partially ionized clouds, but at larger distances space is only partially filled with partially ionized clouds. We find that the neutral hydrogen number density in the LIC and likely other warm clouds in the CLIC is about 0.10 cm–3 rather than the 0.20 cm–3 density that may be representative of only the immediate environment of the LIC. The ≤3000-12,000 K temperature range for the gas is wider than the predictions of thermal equilibrium theoretical models of the warm neutral medium and warm ionized medium, and the high degree of inhomogeneity within clouds argues against simple theoretical models.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Interstellar clouds - Interstellar dynamics - Interstellar magnetic fields - Ultraviolet sources

VizieR on-line data: <Available at CDS (J/AJ/164/106): tablea1.dat>

CDS comments: Comments on Table A1: NN Peg is a probable misprint for HN Peg ; SAO 254993 is not HD 203554 ; V368 Cep is not HD 22014 ; GD 153 is not HD 23189.

Simbad objects: 118

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