A spectral line survey of selected 3 millimeter bands toward Sagittarius B2(N-LMH) using the National Radio Astronomy Observatory 12 meter radio telescope and the Berkeley-Illinois-Maryland Association array. I. The observational data

We have initiated a spectral line survey, at a wavelength of 3 mm, toward the hot molecular core Sgr B2(N-LMH). This is the first spectral line survey of the Sgr B2(N) region utilizing data from both an interferometer (Berkeley-Illinois-Maryland Association [BIMA] array) and a single-element radio telescope (NRAO 12 m). In this survey, covering 3.6 GHz in bandwidth, we detected 218 lines ( 97 identified molecular transitions, one recombination line, and 120 unidentified transitions). This yields a spectral line density ( lines per 100 MHz) of 6.06, which is much larger than any previous 3 mm line survey. We also present maps from the BIMA array that indicate that most highly saturated species ( three or more H atoms) are products of grain chemistry or warm gas-phase chemistry. Because of the nature of this survey, we are able to probe each spectral line on multiple spatial scales, yielding information that could not be obtained by either instrument alone.