New 14-GHz Map Of The GCL "Superbubble" Region Showing Interesting Filamentary And Compact Structures

Details New 14-GHz Map Of The GCL "Superbubble" Region Showing Interesting Filamentary And Compact Structures New 14-GHz Map Of The GCL "Superbubble" Region Showing Interesting Filamentary And Compact Structures

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.3302b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #33.02; Bulletin of the American Astronomical Society, Vol. 39, p.785

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We present a Ku-band (14GHz) GBT map of the walls of the Galactic Center Lobe (GCL): a 1-deg wide, Ω-shaped, superwind bubble feature first discovered and mapped (at 10GHz) by Sofue (1985). The GCL consists primarily of two walls extending to the galactic north above the Galactic Plane, centered around (l,b)=(-0.3,+0.5). Our 14GHz map shows resolved features not observed in lower-frequency maps. These features are generally consistent with the brightness distribution of Sofue's original map, as well as the Bonn 2 and 5GHz survey maps. However, our new image differs from earlier images in some important details: first, Sofue's 10GHz map shows that the East wall (l=+0.2) is consistently brighter than the West wall (l=-0.6). At 14GHz, the walls are observed to have several knots or hotspots resulting in periodic brightening and dimming of the East wall relative to the West wall (as a function of increasing galactic latitude). Second, there is a very distinct filamentary structure between the East and West walls that is not present in Sofue's map. Third, we find that there is bridge connecting the East and West walls at b=+0.35 that is not observed in other maps. Indeed, our high-resolution map shows a plethora of filamentary and compact structures not observed in previous maps.

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