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High Velocity Cloud Complex C with sightlines MRK279, MRK205, MRK817, MRK876 and PG1626+554
(Top Image) HE1143-1810
(Bottom Image) MRK421
MRK421 ( ~ -67 km/s)
This sightline had measureable absorption levels of ten ions with abundances between 0.15 and 0.56 solar. We found the OI abundance to be very high (0.5 solar) and approximately twice that of FeII.
PG0953+414( ~ -60 km/s)
OI and FeII had the strongest absorption lines in this sightline with abundances around 0.35 solar. In general, the other metals that were easily measured were ArI and NI with absorption levels around 0.25 solar.
HE1143-1810 (56 km/s)
This was the only positive Intermediate Velocity Cloud that was analyzed in this project. It showed abundances in FeII, OI and SiII close to solar (0.75 solar); NI had a much lower metallicity as compared to that of the Sun around 0.2 solar.
This is a high-velocity cloud that is believed to have been tidally torn from the Small Magellanic Cloud. The sightlines used to measure the metallicities of this cloud produced few absorption lines which made it very difficult to get an accurate limit on the abundances of this cloud. It has a very high velocity.
NGC7469 ( ~ -333 km/s)
The absorption lines of this sightline were very difficult to detect; the data obtained could, at best, only provide lower limits for the metal content of the Magellanic Stream. Nonetheless, overall an abundance of greater than 0.4 solar was seen using this sightline.
NGC7714 (~ -311 km/s)
Only three types of ions were detected in this sightline, PII, ArI and FeII. Of those three, only FeII could be measured with much accuracy, it showed an abundance of 0.15 solar.
The Magellanic Stream with sightlines NGC7714 and NGC7469
Positive High Velocity Clouds with sightlines NGC5253,
PG1011-040 and ESO265-G23
ESO265-G23 (~117 km/s)
The abundances of OI and FeII were measured fairly easily using ESO265-G23. Both ions had abundances of 0.13 solar; other metals in this sightline were harder to measure but seem to be around 0.13 solar.
PG1011-040 (~ 128 km/s)
This sightline also showed a number of detected ion absorptions; OI and FeII were around 0.34 solar.
NGC5253 (~102 km/s)
A difficult sightline with few absorption lines, FeII was the easiest and most accurate abundance to determine and was found to be approximately 0.35 solar.