To simplify adding orders, we defined two useful S-Lang functions. Using those functions, the procedure becomes fairly trivial:
_auto_declare = 1; () = evalfile ("add_orders.sl"); % Here are our data files pha2_file = "acisf01318N003_pha2.fits.gz"; m_arf = "acisf01318_000N001MEG_-1_garf.fits.gz"; p_arf = "acisf01318_000N001MEG_1_garf.fits.gz"; % Load counts from MEG +1 and -1 orders () = load_data (pha2_file, [9,10]); % Load matching ARFs () = load_arf (m_arf); () = load_arf (p_arf); % Sum counts in first order and add the ARFs % and assign the summed ARF to the summed % counts spectrum: d = add_orders (1, 2); a = add_arfs (1, 2); assign_arf (a, d); % Divide the counts by the ARF and % plot the flux-corrected spectrum flux_corr (d); % Now plot the flux-corrected spectrum id = plot_open ("ex_add_orders.ps/cps"); plot_data_flux (d); plot_close (id);Here is the resulting plot.
For an alternative approach to combining datasets, see the
description of the
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This page is maintained by John C. Houck. Last updated: Feb 2, 2019