| Type |
Conference Paper |
| Names |
Cynthia S. Froning, L. Winter, B. Keeney, C. Danforth, J. Green, J. Shull, B. Savage, J. Stocke, B. Welsh, A. Narayanan, K. Sembach, J. Scott, S. Penton |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #215, #464.15 |
| Volume |
42 |
| Pages |
501 |
| Date |
January 1, 2010 |
| URL |
http://adsabs.harvard.edu/abs/2010AAS...21546415F |
| Library Catalog |
NASA ADS |
| Abstract |
We present FUV spectroscopy of Mrk 817 obtained with the Cosmic Origins
Spectrograph as part of the HST Early Release Observation program after
Servicing Mission 4. FUV (1135 - 1735 A) moderate resolution (R 20,000)
spectra of Mrk 817 were obtained in two HST orbits. The high S/N ( 40)
spectra cover 15 times the bandpass of the previous GHRS observations in
1/10th the observing time. Mrk 817 is a nearby (z=0.031) Seyfert 1.5
galaxy that exhibits a powerful outflow (v 4200 km/s) seen in neutral
hydrogen and highly ionized transitions (OVI, NV, CIV). The sightline to
Mrk 817 also passes through the large High Velocity Cloud Complex C,
which is detected quite prominently in numerous UV absorption lines of
both low-ionization gas (OI, SII, CII, SiII) and high ions (CIV, SiIV,
SiIII, SiIV, etc). This HVC and others may provide a major reservoir of
low-metallicity gas, falling inward from the Galactic halo to the disk.
In this poster, we present early results from the COS observations of
Mrk 817, including discussion of the time variability of the intrinsic
outflow and on the properties of Complex C. |