AC45 scaling factor

Please note for the observations with the use of the receivers except BEARS with AC45 (especially, A25) that we have found the difference in the line intensity for the same source of the same line among arrays of AC45 and generally have found the line intensities with AC45 smaller than those with AOSs. (For the use of BEARS with AC45, please see the page of "BEARS Calibration". ) We show the scaling factor of arrays of AC45 against AOSs for each frequency band width mode, below. Please divide the intensities obtained from the observations with AC45 by the following factors.

Since the time dependence of the scaling factors is not well understood, they can be applied to data in the same observing period.

Period	Bandwidth	A1	A5	A9	A13	A17	A19	A21	A25
December 2010 - May 2011^(*1)	4 MHz	0.86	0.82	0.86	0.72	0.82	0.76	0.74	0.57
	8 MHz	0.86	0.87	0.89	0.74	0.86	0.79	0.77	0.60
	16 MHz	0.82	0.81	0.81	0.66	0.79	0.75	0.73	0.64
	32 MHz	0.80	0.77	0.81	0.67	0.77	0.72	0.69	0.67
December 2009 - May 2011^(*2)	512 MHz	0.95	1.00	0.94	0.88	0.99	0.92	0.93	0.79
December 2012 - May 2013^(*3)	32 MHz	-	-	-	-	0.71	0.82	1.03	1.10
December 2012 - May 2013^(*3)	512 MHz	-	-	-	-	0.96	0.95	1.14	0.71
December 2013 - May 2014	32 MHz^(*4)	-	-	-	-	0.74 ± 0.01	0.67 ± 0.01	0.77 ± 0.01	0.76 ± 0.01
December 2013 - May 2014	512 MHz^(*5)	-	-	-	-	1.03 ± 0.00	1.09 ± 0.00	0.92 ± 0.00	0.84 ± 0.00

The values are calculated from the ratios of velocity integrated intensity [K km/s] of spectral data (AC45/AOSs) obtained from the simultaneous observations with AC45 and AOSs for the same source and line.

(*1) 4, 8, 16, and 32 MHz mode in the period from December 2010 to May 2011 --
date: 2010/12/21, receiver: H22, source: ON-2-N, window function: HAMM, setting: For available six IF lines, we connected one line to AOS-H and remaining five lines to AC45. We show the average values of two measurements that were carried out with exchange of connecting IF lines to AOS-H (except for A1, A5, which were measured only one time).

(*2) 512 MHz mode in the period from December 2009 to May 2011 --
the average values of three measurements in a, b, below.
1. date: 2010/5/21, 5/25, receivers and settings: T100H was connected to AOS-W1~4 and A1~13, T100V was connected to W5~8, and A17~25, source: Orion-South, window function: HANN,
2. date: 2010/10/28, receiver and setting: H22 was connected to AOS-W and AC45, source: VX-SGR, window function: HAMM

(*3) 32 and 512 MHz mode in the period from December 2012 to May 2013 --
date: 2013/5/28, receiver: S100, source: W3 core, window function: None (for 32 MHz mode) and HANN (for 512 MHz mode), setting: S100 was connected to AOS-H1~8, W5~8, and A17~25.

(*4) 32 MHz mode in the period from December 2013 to May 2014 --
date: 2013/12/08, receiver: S100, source: W3 core, window function: HANN, setting: The receiver was connected to AOS-H1~8, W5~8(the data of W7,8 are not excluded in this analysis), and A17~25.

(*5) 512 MHz mode in the period from December 2013 to May 2014 --
date: 2014/04/15, receiver: S100, source: IRC+10216, window function: HANN, setting: The receiver was connected to AOS-H1~8, W5~8(the data of W7,8 are not excluded in this analysis), and A17~25.

2014-04-03