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D.J. Helfand, S. Tuttle (Columbia University), R.H. Becker (UC Davis), R.L. White (STSci), R.S. Warwick (University of Leicester)
We are in the process of constructing a deep, high-resolution, multiwavelength image of the Galactic plane in the first quadrant. Observations with the Very Large Array in the B, C, and D configurations have been added to single-dish data in order to obtain an image at 20cm with a sensitivity of ~2mJy and a dynamic range of 500:1. Some 90-cm data have also been obtained, and we have conducted a comparison of the new maps with archival 6cm images. The maps are now complete over the region 32 deg < l < 5 deg within +/- 0.6 deg of the plane. Portions of this region have also been covered with the imaging instruments on XMM-Newton in the 0.3-12 keV band; archival data from ASCA have also been examined. Finally, we have undertaken a detailed comparison of the radio data with mid-IR images from the MSX mission. Hundreds of new HII regions and dozens of supernova remnant candidates are apparent. We discuss these results and their implications for the birthrate of massive stars in the Galaxy.
This supported under grants AST-02-06055 from the NSF and NAG5-13062 from NASA.
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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.