Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21721706y&link_type=abstract
American Astronomical Society, AAS Meeting #217, #217.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present ultraviolet spectrocopic observations of Mrk 421 with the Cosmic Origins Spectrograph, which are further complemented by observations obtained with FUSE. A high velocity cloud (HVC) at -130 km/s (LSR) is not visible in 21 cm emission (log NHI < 18.38), but is detected in C II, N I, O I, O VI, Si II, Si IV, and Fe II in far ultraviolet absorption spectra. By referencing velocities to the intermediate velocity cloud at -60 km/s and jointly analyzing absorption lines of high-order H I Lyman series, we measure the H I column density in HVC as log NHI =16.84(-0.13, +0.34) (1 sigma uncertainty). Comparing H I and O I, we infer the HVC metallicity to be [O/H] = 0.32(-0.39, +0.22) solar. The sight line is about 4 degrees away from the HVC complex M (specifically cloud M I). The high metallicity indicates that the HVC may represent the high velocity end of the complex and is the condensed returning gas of a Galactic fountain.
Danforth Charles W.
Shull Michael J.
Yao Yangsen
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