2017MNRAS.464..783S -
Mon. Not. R. Astron. Soc., 464, 783-793 (2017/January-1)
Three-dimensional Aquila Rift: magnetized H I arch anchored by molecular complex.
SOFUE Y. and NAKANISHI H.
Abstract (from CDS):
Three-dimensional structure of the Aquila Rift of magnetized neutral gas is investigated by analysing H I and CO line data. The projected distance on the Galactic plane of the H I arch of the Aquila Rift is r⊥ ∼ 250 pc from the Sun. The H I arch emerges at l ∼ 30°, reaches to altitudes as high as ∼500 pc above the plane at l ∼ 350°, and returns to the disc at l ∼ 270°. The extent of arch at positive latitudes is ∼1 kpc and the width is ∼100 pc. The eastern root is associated with the giant molecular cloud complex, which is the main body of the optically defined Aquila Rift. The H I and molecular masses of the Rift are estimated to be M_ H I_∼1.4×10^5 M^_☉_ and M_ H2∼3×10^5 M^_☉_. Gravitational energies to lift the gases to their heights are E_ grav: H I_∼1.4×1051 erg and E_ grav: H2∼0.3×1051 erg, respectively. Magnetic field is aligned along the H I arch of the Rift, and the strength is measured to be B ∼ 10 µG using Faraday rotation measures of extragalactic radio sources. The magnetic energy is estimated to be Emag ∼ 1.2 x 1051 erg. A possible mechanism of formation of the Aquila Rift is proposed in terms of interstellar magnetic inflation by a sinusoidal Parker instability of wavelength of ∼2.5 kpc and amplitude ∼500 pc.
Abstract Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
instabilities - polarization - ISM: lines and bands - ISM: magnetic fields - ISM: structure - local interstellar matter - local interstellar matter
Simbad objects:
7
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