Jeremy Bradford edited Proposed HI Observations.tex  over 9 years ago

Commit id: d06e69bc9d5cff5bdc045a3cb3f25599aa4ca303

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We will observe our target dwarf galaxy AGN candidates in the L-band wide receiver, with the spectrometer in 9 level sampling mode with 4096 channels and a 12.5 MHz bandwidth. This yields a velocity resolution of 0.66 km/s which we will center on the redshifted 21-cm line using the SDSS optically measured recession velocity. All of our target galaxies have recession velocities less than 5000 km s−1 and are unresolved by the Arecibo beam. We chose the L-band over the ALFA receiver as it has a higher sensitivity and minimizes side-lobe contamination. To mitigate any baselines issues, we will perform an associated off observation (position switching) of equal integration time for each target.  We request primarily night-time observing only in order to avoid standing waves due to solar interference which make estimating accurate baselines difficult.  Using recently obtained HI data for low mass, mass  isolated galaxies - galaxies,  we have determined calibrated  the relation of HI gas mass to stellar mass. [WORKING-JB] Using this relation with the distances determined from SDSS redshifts, we have determined estimated integration times for all of our targets. We request a total of 43 hours with the Arecibo telescope to observe 98 low mass AGN candidates. Given our prior experience, we are confident that we will obtain high quality, high signal-to-noise spectra for our proposed observations.  We have recently completed an a fully  automated set of reduction and measurement  scripts for 21-cm emission spectra. Therefore, we can spectra obtained at Arecibo. We will therefore  reduce our new observations  and measure the HI parameters of our proposed HI observations the emission lines  within days of obtaining them. completing our observations.  This expedited and automated pipleline  will enable an extremely quick turn-around time for us to quickly meet  our science objectives and publications. [WORKING-JB]  We request primarily night-time observing only in order to avoid standing waves due to solar interference which make estimating accurate baselines difficult. We request a total of 43 hours with the Arecibo telescope to observe 98 low mass AGN candidates. publish our analysis and results.