PACS and SPIRE photometer maps of M 33: First results of the HERschel M 33 Extended Survey (HERM33ES)

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Table 1:

Results of fits of one and two emission components to the measured spectral energy distributions (SEDs) of the MIPS, PACS, SPIRE data of M 33 shown in Fig. 3.
	Total	(1)	(2)	(3)	(4)
Isothermal fits
T/[K]	29	25	28	105	37
$\beta$	0.5	1.4	0.8	-1.8	-0.8
$\chi^2_{\rm red}$	45	44	45	3	6
Two-component fits with $\beta =2$
$T_{\rm c}$ /[K]	16	20	17	14	12
$T_{\rm w}$ /[K]	50	55	51	49	48
$M_{\rm c}$ /[10⁶ $M_{\odot}$ ]	8.0	1.0	2.4	3.6	4.0
$M_{\rm c}/M_{\rm w}$	1000	900	900	1700	5600
$\chi^2_{\rm red}$	0.41	0.23	0.33	0.42	1.8
$M_{\rm gas}/M_{\rm c}$	250	230	180	160	200
Two-component fits with $\beta =1.5$
$T_{\rm c}$ /[K]	19	24	20	16	13
$T_{\rm w}$ /[K]	55	77	57	52	51
$M_{\rm c}$ /[10⁶ $M_{\odot}$ ]	10	1.2	3.0	4.6	4.9
$M_{\rm c}/M_{\rm w}$	500	3800	480	730	2200
$\chi^2_{\rm red}$	0.14	0.10	0.12	0.20	1.8
$M_{\rm gas}/M_{\rm c}$	200	190	150	120	160
Two-component fits with $\beta=1$
$T_{\rm c}$ /[K]	23	28	24	19	15
$T_{\rm w}$ /[K]	62	-	67	57	55
$M_{\rm c}$ /[10⁶ $M_{\odot}$ ]	12	1.6	3.6	5.7	5.8
$M_{\rm c}/M_{\rm w}$	300	-	440	330	870
$\chi^2_{\rm red}$	0.22	0.6	0.26	0.30	2.4
$M_{\rm gas}/M_{\rm c}$	170	140	120	100	140
Total gas mass
$M_{\rm gas}/[10^6~$ $M_{\odot}$ ]	2020	230	440	560	790

Notes. For the two-component fits, the dust emissivity index was kept fixed. $T_{\rm c}$ , $T_{\rm w}$ are the temperatures of the cold and warm component. $M_{\rm c}$ is the total cold dust mass per annulus. $M_{\rm c}/M_{\rm w}$ is the dust mass ratio of both components. $\chi^2_{\rm red}$ is the $\chi^2$ divided by the number of observed parameters minus the number of fitted parameters minus 1. The 100 $\mu$ m flux density measured in the outermost zone was not used for the fits. The columns give the radial annuli: Total: 0<R<8 kpc, (1): 0<R<2 kpc, (2): 2<R<4 kpc, (3): 4<R<6 kpc, (4): 6<R<8 kpc. The last line at the bottom of the table gives the total gas masses $M_{\rm gas}=1.36~(M({\rm H}_2)+M($ H I)) (Gratier et al. 2010).

Source LaTeX | All tables | In the text

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