A kinematic study of the irregular dwarf galaxy NGC 4861 using H I and Hα observations

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Volume 505 / No 1 (October I 2009)

A&A, 505 1 (2009) 105-116

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Table 1:

H I properties as measured from the VLA data.
Parameters [Unit]	NGC 4861	NGC 4861 B
optical centre^a:
$\alpha$ (J2000.0)	12 $\rm ^h$ 59 $\rm ^m$ 02.3 $\rm ^s$
$\delta$ (J2000.0)	+34 $^\circ$ 51 $^\prime$ 34 $^{\prime \prime }$
D [Mpc]^b	7.5
dynamic centre^c:
$\alpha$ (J2000.0)	12 $\rm ^h$ 59 $\rm ^m$ 01.4 $\rm ^s$	12 $\rm ^h$ 59 $\rm ^m$ 32.6 $\rm ^s$
$\delta$ (J2000.0)	+34 $^\circ$ 51 $^\prime$ 43 $^{\prime \prime }$	+34 $^\circ$ 51 $^\prime$ 15 $^{\prime \prime }$
$\ensuremath{v_{\rm sys}}$ [ $\ensuremath{\mbox{km}~\mbox{s}^{-1}}$ ]^c	$835\pm 1$	791
i [ $^\circ$ ]^c	$65\pm 3$	65
PA [ $^\circ$ ]^c	$16\pm 3$	244
$\ensuremath{v_{\rm rot}}$ [ $\ensuremath{\mbox{km}~\mbox{s}^{-1}}$ ]^c	46	4.4
$F_{\rm HI}$ [Jy $\ensuremath{\mbox{km}~\mbox{s}^{-1}}$ ]	36.08	0.30
$M_{\rm HI}$ [ $\rm 10^8$ $M_{\odot}$ ]	4.79	0.04
H I diameter [ $^\prime$ ]	7.0 $\rm\times$ 4.9	1.6 $\rm\times$ 0.9
" [kpc]	15.2 $\rm\times$ 10.7	3.6 $\rm\times$ 1.9
H I / opt. ratio	2.3 $\rm\times$ 5	...
$\langle\sigma\rangle$ [ $\ensuremath{\mbox{km}~\mbox{s}^{-1}}$ ]	14	7
$\sigma_{\rm Peak}$ [ $\ensuremath{\mbox{km}~\mbox{s}^{-1}}$ ]	22.8	9.9
$r_{\rm HI,max}$ [kpc]	10.9	2.7
$M_{\rm dyn}$ [ $\rm 10^9$ $M_{\odot}$ ]	5.4	0.012

^a Data from NED; ^b distance from de Vaucouleurs et al. (1991); ^c derived by fitting a tilted-ring model to the H I data. In case of NGC 4861, where all parameters were fitted iteratively, the error weighted mean values plus uncertainties are given. The errors of the dynamic centre position are far below one beam size. The parameters of NGC 4861 B were estimated from fitting ellipses to the H I distribution.

Source LaTeX | All tables | In the text

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