Observational evidence for the accretion of low-metallicity gas onto the Milky Way:metallicity, physical conditions and distance limit for HVC complex C
In: $2, 1999
Online
Zeitungsartikel
Zugriff:
We present observations of the (field of the) Seyfert galaxy Mark 290, which probes the high-velocity cloud (HVC) complex C, one of the largest HVCs (Wakker & van Woerden 1991). We find that this object has a metallicity of 0.094+/-0.020^{+0.022}_{-0.019} times solar. We determine a lower limit to its distance of 5 kpc (z>3.5 kpc). If the gas is in thermal equilibrium with a hot halo, then it is also likely that D3 Gyr ago (an "Old Magellanic Stream"; Toomre, quoted in Kerr & Sullivan 1969), or was formed when hot, ionized intergalactic gas was compressed by the motion of the Milky Way (Silk et al. 1987).
| Titel: |
Observational evidence for the accretion of low-metallicity gas onto the Milky Way:metallicity, physical conditions and distance limit for HVC complex C
|
|---|---|
| Autor/in / Beteiligte Person: | Wakker, Bart P. ; Howk, J. Chris ; Savage, Bart D. ; Tufte, Steve L. ; Reynolds, Ron J. ; van Woerden, Hugo ; Schwarz, Ulrich J. ; Peletier, Reynier F. ; Gibson, Brad K. |
| Link: | |
| Zeitschrift: | $2, 1999 |
| Veröffentlichung: | Astronomical Society of the Pacific, 1999 |
| Medientyp: | Zeitungsartikel |
| Sonstiges: |
|