A high-resolution optical and radio study of Milky Way halo gas

Details A high-resolution optical and radio study of Milky Way halo gas A high-resolution optical and radio study of Milky Way halo gas

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...88...81a&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 88, no. 1, p. 81-117.

Astronomy and Astrophysics

Astronomy

72

Absorption Spectra, Galactic Halos, Interstellar Gas, Milky Way Galaxy, Radio Astronomy, Velocity Distribution, Visible Spectrum, Abundance, Calcium, Emission Spectra, Lyman Alpha Radiation, Titanium

Scientific paper

Optical interstellar absorption lines of Ti II and Ca II and the 21 cm emission line of H I were observed at high-resolution (6 and 1 km/s, respectively) and high detection sensitivity along 25 lines of sight in the Galactic halo. The sample includes 16 distant halo stars matched with one or more nearly aligned foreground stars as well as local stars along five extragalactic sight lines. The data show substantial interstellar material, at both low and intermediate velocities, between 250 and 1000 pc beyond the Galactic plane. As much as one-third of the total gas observed in Ca II absorption may be beyond 1 kpc, and the gaseous Ti II may lie in an even thicker layer. The directly determined gaseous Ti abundance above the Galactic plane exceeds that in the disk, on the average, by a factor of 4 to 6 and, for individual cloud components, is further enhanced at higher LSR velocity. Thirty three discrete high-latitude clouds are detected in Ca II absorption, and 17 discrete clouds, including three high-velocity clouds, are identified in H I emission. The kinematics of the high-latitude gas observed in Ti II and Ca II absorption is characterized by significant peculiar velocities with respect to a model corotating halo.

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