EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 518 (July-August 2010) A&A, 518 (2010) L67 Full HTML

 

 

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

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.