Does the Milky Way produce a starburst wind?
Abstract
We present new FUSE and HST/stis observations of two high galactic latitude AGN that we use to measure the nuclear wind velocity of the milky way for the first time. We find high velocity C IIi & O VI at a heliocentric velocity of +163 ± 8 {km s-1} and C IIi & N V at -105 ± 14 {km s-1} toward pks 2005-489 (l=350°, b=-33°) and C III, C IV, & Si IV and C III & O VI toward mrk 1383 (l=349°, b=55°) at +48 ± 4 {km s-1} and +94 ± 7 {km s-1}, respectively. We have estimated the galactocentric escape velocity of gas above the galactic centre along the pks 2005-489 and mrk 1383 sight-lines to be ≥ 215 ± 35 and ≥ 145 ± 25 {km s-1}, respectively. Thus, we have detected both infalling and bound outflowing gas from the galactic centre, indicating that the milky way does not produce a starburst wind, but a bound galactic "fountain" instead.
- Publication:
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IAU Colloq. 199: Probing Galaxies through Quasar Absorption Lines
- Pub Date:
- March 2005
- DOI:
- Bibcode:
- 2005pgqa.conf..424K