1D: Constrained two disk fits

Two galaxies were selected for a test of the 1D constrained two disk fit. We selected on the basis of a clearly present thick disk component in the profiles, but with a low thick disk scaleheight. IC 3322A and NGC 5981, both in the J-band, were chosen. An outer limit was determined by comparing the shape and extent of the different vertical profiles to see where the noise clearly started to dominate. For both galaxies $z_{\textrm{\scriptsize max}}$ was set at 30 arcseconds. No lower surface brightness limit was set as the fit is weighted with the intensities. $z_{\textrm{\scriptsize min}}$ is the same for the 2D Two Disk fit (see Table 11), determined at where the flattening of the inner part of the profile started, which is approximately equal to two times the FWHM. For each quadrant we determined the average or mean, depending if they deviated by more than 0.3 arcseconds, of

for each cut by selecting 4-5 datapoints of the inner part of the profile and fitting a linear slope to it. The thin disk scaleheight is given in the title of each subtable of Tables 8 and 9.

TABLE 8

IC 3322A J
1D: CONSTRAINED TWO DISK FIT RESULTS

A: UPPER NORTH-WEST [ = 4.1]
	[]	[mag/ $\Box ''$ ]	[mag/ $\Box ''$ ]
(1)	(2)	(3)	(4)	(5)
-	30.5	-
-	34.1	-
0.0053	38.0	18.33	22.95	8.65*
0.0151	42.4	18.49	22.33	4.19
0.0257	47.1	18.66	22.22	3.57
0.0593	51.9	19.05	21.73	3.02
0.0387	57.4	19.58	21.43	2.64
0.0815	63.4	20.97	20.51	1.80*
0.0065	70.1	20.19	21.83	2.83*
0.0663	77.2	21.05	21.16	2.00*
0.0484	84.7	20.32	23.41	8.78*

B: LOWER NORTH-WEST [ = 3.6]

[] [mag/ $\Box ''$ ] [mag/ $\Box ''$ ]

(1) (2) (3) (4) (5)

0.0225 30.9 18.38 21.59 4.36

0.0340 34.1 18.42 21.95 4.77

0.0143 38.0 18.60 21.36 3.19

0.0338 42.4 18.80 21.12 2.54

0.0169 47.1 18.79 22.48 6.40

0.0181 51.9 18.85 23.06 9.60*

0.0277 57.4 19.14 22.37 4.01

0.0982 63.4 19.63 21.79 2.88

0.0349 70.1 19.78 21.82 2.72

0.0242 77.2 20.27 21.33 2.00*

0.0225 84.7 19.97 23.67 9.56*

C: UPPER SOUTH-EAST [ = 4.1]
	[]	[mag/ $\Box ''$ ]	[mag/ $\Box ''$ ]
0.0244	30.9	18.36	22.35	3.90
0.3393	34.5	18.99	19.71	1.38*
0.0576	38.0	18.50	22.58	3.70
0.0206	42.4	18.65	22.90	6.12
0.0231	47.1	18.93	22.27	3.69
0.0206	52.3	19.34	21.55	2.45
0.1572	57.8	20.71	20.32	1.57*
0.1354	63.8	21.06	20.61	1.56*
0.0510	70.1	20.38	22.15	2.71
0.0572	77.2	20.50	22.73	3.07

D: LOWER SOUTH-EAST [ = 4.0]

[] [mag/ $\Box ''$ ] [mag/ $\Box ''$ ]

0.0144 30.9 18.73 21.96 3.92

0.0485 34.5 18.75 22.19 3.33

0.0089 38.0 18.89 21.78 3.09

0.0762 42.4 20.76 19.40 1.33*

0.0280 47.1 19.09 21.49 2.37

0.0344 52.3 19.06 21.99 2.88

0.0154 57.8 19.15 23.01 6.34

0.0445 63.8 19.66 21.33 1.95*

0.0596 70.1 19.48 22.82 2.99

0.1554 77.2 19.83 22.05 1.98*

Notes: (1) See Section 3.6 for the defitinion. (2) central radial position of the bin. (3) Thin disk central surface brightness. (4) Thick disk central surface brightness. (5) Thick disk/thin disk scaleheight ratio. * cuts not taken into account for determining the average parameters.

The results are shown in Table 8 and 9 for IC 3322A and NGC 5981 respectively. The tables are set in sets of four, for each quadrant of the galaxy. For IC 3322A J we found an average

of 3.9 $\pm$ 0.4 arcseconds and an average

of 3.7 $\pm$ 1.2 with an average $\mu_{n-k}$ of 3.0 $\pm$ 0.7 mag arcsec $^{-2}$ . We chose to represent $\mu_{n-k}$ as this value gives a good indication of the brightness difference between the thin and the thick disk. For NGC 5981 J we found a

of 3.1 $\pm$ 0.4 arcseconds and a

of 3.9 $\pm$ 1.7 with a $\mu_{n-k}$ of 3.7 $\pm$ 1.0 mag arcsec $^{-2}$ .
The cuts in the tables marked with a * were not used to determine the average parameter values as they either contained background structure making

too large to be trustworthy, were partially masked or contained other irregularities that made the fit doubtful. We were not able to fit all profiles due to residual background structures or too heavy irregularities in the profile.
One can clearly see a lot of variation in the results and that the results are very sensitive to the local intrinsic vertical structure of the galaxy. It is hard to see any trends, especially in the case of NGC 5981 which has many cuts which could not be fitted.

TABLE 9

NGC 5981 J
1D: CONSTRAINED TWO DISK FIT RESULTS

A: UPPER NORTH-WEST [ = 3.1]
	[]	[mag/ $\Box ''$ ]	[mag/ $\Box ''$ ]
0.0109	21.4	17.22	22.09	5.94
0.0382	24.2	17.23	22.38	6.52
0.1234	27.3	17.39	21.27	2.83
0.0248	30.5	17.39	22.95	9.17*
0.1103	34.1	17.51	21.89	3.45
0.0251	38.0	17.53	23.54	8.65*
-	42.4	-
-	47.1	-
0.0260	51.9	18.60	19.82	1.49*
0.3152	57.4	18.94	20.19	1.58*

B: LOWER NORTH-WEST [ = 3.3]

[] [mag/ $\Box ''$ ] [mag/ $\Box ''$ ]

0.1121 21.4 18.00 20.90 2.61

0.0434 24.2 17.97 22.02 4.94

0.0384 27.3 18.05 21.95 3.79

0.0315 30.5 18.14 21.85 2.88

0.0575 34.1 18.59 20.11 1.64

0.0188 38.0 18.41 21.73 2.68

0.1352 42.4 18.45 22.38 2.79

- 47.1 -

- 51.9 -

- 57.4 -

C: UPPER SOUTH-EAST [ = 3.3]
	[]	[mag/ $\Box ''$ ]	[mag/ $\Box ''$ ]
-	21.8	-
-	24.6	-
-	27.3	-
0.3317	30.9	17.79	23.00	8.12*
-	34.5	-
0.0640	38.0	18.17	22.06	3.27
0.0319	42.4	18.40	21.82	2.88
-	47.1	-
0.1280	52.3	18.89	21.45	2.42
0.4340	57.8	19.16	22.32	3.59
0.0744	63.8	20.84	20.72	1.98*

D: LOWER SOUTH-EAST [ = 3.0]

[] [mag/ $\Box ''$ ] [mag/ $\Box ''$ ]

0.0652 21.8 17.49 22.17 5.95

0.0344 24.6 17.54 22.98 11.94*

0.0407 27.3 17.66 22.71 7.99*

- 30.9 -

0.0321 34.5 17.94 22.84 7.70*

0.0140 38.0 18.18 22.47 5.22

0.0401 42.4 18.74 20.63 2.13

0.1170 47.1 18.84 22.03 3.54

0.0397 52.3 19.28 21.96 3.88

- 57.8 -

- 63.7 -

Notes: See Table 9 for a description.