Intrinsic values of the 2D two disk results

Table 12 shows the results and input parameters of our fits converted to intrinsic sizes together with the thin and thick disk values of the Milky Way in the near-infrared (see Ojha 2001) for comparison. Additionally the ratio between the total luminosity of the thick and the thin disk is given. The luminosity ratios were determined with the formula

$$L_{\textrm{\scriptsize tot}}\ =\ 4\pi h^2 z_0 L_0\ ,$$ (16)

taken from Van der Kruit & Searle (1981a), where $h$ is the scalelength, $z_0$ the scaleheight and $L_0$ the central luminosity, calculating the total luminosity for the thick and the thin disk and dividing them. The average luminosity ratio is 0.21 $\pm$ 0.13. It has to be noted for equation 16 it is assumed that there is no truncation over the radius, causing the total luminosity to be overestimated. As we use a ratio of two total luminosities, this value is not much effected by this overestimation.
Most of our thick disk component have a higher scaleheight than the Milky Way. It only resembles our galaxies with the lowest thick scaleheight. NGC 5290, which in mass and size can be compared best to our Milk Way is far more extended than the Milky Way for its thin and thick disk components.

TABLE 12

2D TWO DISK FIT RESULTS IN PARSECS

Galaxy	Filter	$z_n$	$z_k$	$h_n$	$R_{\textrm{\scriptsize min}}$	$R_{\textrm{\scriptsize max}}$	$z_{\textrm{\scriptsize min}}$	$L_k/L_n$
		[pc]	[pc]	[kpc]	[kpc]	[kpc]	[pc]
IC 3322A	J	300	1030	2.0	2.4	47.3	360	0.20
IC 3322A	K'	250	1780	1.7	2.4	47.3	180	0.23
NGC 2424	J	840	5810	5.2	7.3	145.1	1330	0.16
NGC 2591	K'	460	2280	2.8	1.4	9.1	430	0.45
NGC 5290	J	900	6510	4.8	6.4	62.5	770	0.46
NGC 5290	K'	850	6490	4.9	6.4	62.5	870	0.22
NGC 5981	J	520	1730	4.1	4.0	41.0	380	0.17
NGC 1886	J	300	1280	2.0	1.6	5.8	320	0.07
NGC 1886	K'	270	800	1.9	1.6	5.8	320	0.16
UGC 4277	J	1190	7720	8.4	5.9	22.9	1160	0.06
UGC 4277	K'	960	7220	7.7	5.9	22.9	1160	0.13
NGC 4179	V	610	2150	1.9	3.0	6.5	350	1.11
Milky Way	NIR	260	860	2.8
Notes: See Table 12 for a description. $L_k/L_n$ is the ratio of central luminosities of the thick and the thin disk.

The luminosity ratios are in three of four cases higher in the K'-band except for NGC 5290. This is also the only galaxy where the scalelength of the thin disk is smaller in the J-band than the K'-band, which is quite unexpected, as it is commonly found to be larger in the J-band. The luminosity ratio given by Pohlen et. al (2004) for lenticular galaxies is somewhat lower than ours: 0.81 to 1.11. Yoachim & Dalcanton (2006) find thin disk scaleheights around that of the Milky Way (200-1000 pc). Only those of the high-mass galaxies are higher (800-1100 pc). This result is somewhat strange, as the Milky Way is a high-mass galaxy. Their thick disk scaleheights (600-1100 pc) are similar to the Milky Way's thick disk scale-height, their high-mass galaxies still giving higher values (1100-1400 pc). Only our galaxies with less prominent bulges, IC 3322A and NGC 5981, represent their results but NGC 5981 is more massive, and thus does not seems to represent mass and scaleheight coupling of Yoachim & Dalcanton (2006) that well. Overall most of our galaxies give much larger scaleheights for the thin and the thick disk.