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26 April 2024 |
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Probing the Outflowing Multiphase Gas ~1 kpc Below the Galactic Center | | Blair D. Savage
; Tae-Sun Kim
; Andrew J. Fox
; Derck Massa
; Rongmon Bordoloi
; Edward. B. Jenkins
; Nicolas Lehner
; Joss Bland-Hawthorn
; Felix J. Lockman
; Svea Hernandez
; Bart P. Wakker
; | | Date: |
21 Jul 2017 | | Abstract: | We report observations of ISM absorption in the UV spectrum of LS 4825, a B1
Ib-II star at a distance of 21 +/-5 kpc in the galactic direction l = 1.67 deg
and b = -6.63 deg obtained by the Space Telescope Imaging Spectrograph (STIS).
The observations probe gas in the low halo ~1 kpc below the galactic center
(GC). The spectrum of an aligned foreground star allows us to separate
foreground (d < 7.0 kpc) from more distant absorption (d > 7.0 kpc). The
spectrum of LS 4825 reveals extremely strong absorption by Si III, C IV, Si IV
and N V with multiple components from -283 to 107 km/s. The absorption by O I,
C II, Si II, N I, Mg II, Fe II, S II and other ions reveals a complex component
structure to the absorption spanning the velocity range from -290 to + 94 km/s.
The foreground (d < 7.0 kpc) low ion absorption is restricted to the velocity
range from 0 to 40 km/s. The low ionization components associated with the GC
are probably tracing cool and warm gas entrained in the nuclear outflow from
the GC. The extremely strong high ion absorption traces cooling transition
temperature gas probably driven by the outflowing hot plasma. Abundances and
physical conditions are presented for low ion absorption near -114 to -98, -78
and 92 km/s. The ram pressure of the outflowing hot gas from the GC is probably
responsible for the extraordinary large thermal pressure, log p/k ~ 5 dex
observed in the component at -114 km/s. | | Source: | arXiv, 1707.6942 | | Services: | Forum | Review | PDF | Favorites | |
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