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Session 52 - Source Surveys and CMB Radiation.
Display session, Wednesday, June 10
Atlas Ballroom,
Optical and far-infrared searches for galaxies fail near the Galactic plane, the so-called "Zone of Avoidance" (ZOA). Fortunately, surveying at 21-cm succeeds in cases of large optical depth and far-infrared confusion. The 25-m Dwingeloo radiotelescope is currently surveying the northern ZOA (30 deg < l < 220 deg; |b|< 5.25 deg) at 21-cm, looking for HI galaxies within the velocity range 0-4000 km/s. In addition to tracing large scale structures in optically obscured regions, the resulting sample will be used to study the HI mass function of galaxies in various environments.
A shallow (5 min/pointing) survey for massive galaxies has been completed, yielding 5 detections, 2 of which were previously unknown. Dwingeloo 1, a spiral galaxy in the IC342/Maffei group was the most significant nearby source. The shallow survey has ruled out the existence of a nearby Andromeda-class galaxy in the northern ZOA that would significantly affect the local gravitational potential.
A deeper (1hr/pointing) survey is now around 50 percent complete and has yielded approximately 40 detections to date, including a few sources in the local void. Insights gained into local large scale structure and a preliminary HI mass function derived from the survey detections will be presented. In addition, efforts to quantify foreground extinction for heavily obscured galaxies will be discussed.
The author(s) of this abstract have provided an email address for comments about the abstract: andyr@as.unm.edu
