HRC Energy Trending

HRC PHA Evolution (QE and Gain Variation with Time)

Following Posson-Brown and Donnelly's memo ( "Evolution of PHA Response in the HRC (pdf)"), we computed evolution of HRC PHA response using following steps:

Find calibration AR Lac observations with HRC. Event 2 data are used.
Compute a radial distance by taking difference between a pointing direction and AR Lac position (RA = 332.179975 degree, DEC = 45.7422544 degree).
Find AR Lac by scanning the entire HRC.
Extract an area around AR Lac with the radius of 60 pixels if the distance less than 10 arcmin, 200 pixels if the distance more than 10 arcmin.
A PHA distribution was obtained from this area, and fit a Vogit profile to find a peak position and a FWHM of the Voigt profile. A median is also computed.
Fit lines between year 2000 and 2012, and 2012 to current year. We dropped year 1999 data as they skew the distribution.

The plots below show the time trend plots of PHA median, PHA Voigt peak position, and PHA FWHM. The data points are separated into the radial distance from the aiming point less than 5 arcmins (blue square), between 5 arcmins and 10 arcmins (red diamond), between 10 arcmins and 15 arcmins (green circle), and more than 15 arcmins (blue triangle). Time positions are slightly shifted to right and left so that data points are not overlapped on the plot.

The tables following the time trend plots list links to the plot of radial distributions of observations of each year. Please select a year. It will open up a plot.

Note: The following plots are interactive plots. If you hover the mouse on a data point, it will display the information about that data point. Because of the large size of the data, the page may take a while to load.

HRC I

Fitted Lines (Intercept is at Year 1999)

	2000-2012			2012-Current
	Intercept	Slope	Slope Error	Intercept	Slope	Slope Error
Dist < 5	156.22	-5.78	0.31	84.24	-4.59	0.25
5 < Dist < 10	141.24	-4.39	0.50	79.88	-4.41	0.24
10< Dist < 15	77.56	-1.65	0.49	35.40	-1.30	0.68
15< Dist	78.38	-0.91	0.28	44.88	-1.93	0.79

HRC I: Radial Distribution of Each Year (Select year to open the plot)

1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012
2013	2014	2015	2016	2017	2018	2019	2020	2021

HRC S

Fitted Lines (Intercept is at Year 1999)

	2000-2012			2012-Current
	Intercept	Slope	Slope Error	Intercept	Slope	Slope Error
Dist < 5	97.34	-2.46	0.32	85.89	-5.68	0.48
5 < Dist < 10	93.95	-1.84	0.12	86.73	-5.61	0.47
10< Dist < 15	89.13	-1.68	0.28	73.28	-3.11	1.42
15< Dist	3.70	13.63	5.43	0.00	0.00	0.00

HRC S: Radial Distribution of Each Year (Select year to open the plot)

1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012
2013	2014	2015	2016	2017	2018	2019	2020	2021

Voigt Profile Fitting Results

If you like to see indivisual fitting parameters and the plot, please go to : Fitting Results page.

Last modified: Sun, 26 Sep 2021 02:40:23

If you have any questions, please contact swolk@cfa.harvard.edu