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