An optical and H i study of the dwarf Local Group galaxy VV124 = UGC4879 - A gas-poor dwarf with a stellar disk?

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Volume 527 (March 2011)

A&A, 527 (2011) A58

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Table 1

Observed and derived parameters of VV124.

Parameter	Value	Notes

α₀	09:16:03.18	J2000
δ₀	+52:50:31.3	J2000
l₀	164.6619°	Gal. long.
b₀	42.8864°	Gal. lat.
SGL	47.6121°	Supergal. long.
SGB	−15.0110°	Supergal. lat.
E(B − V)	0.015 ± 0.001
(m − M)₀	25.61 ± 0.13
D	1.3 ± 0.1 Mpc
1 arcsec	6.3 pc	conv. factor at D = 1.3 Mpc
ϵ	0.44 ± 0.04
PA	84.2° ± 10.5°
μ_r(0)	21.1 ± 0.10 mag/arcsec²	^a
μ_g(0)	21.0 ± 0.10 mag/arcsec²	^a
μ_V(0)	21.2 ± 0.15 mag/arcsec²	^a
	17.4″	Sérsic scale radius
	17.5″	Sérsic scale radius
	41.3″	^b
μ_r(R_ϵ < R_e)	22.5 ± 0.15 mag/arcsec²	^a ^c
r_h	39.7″	^d
g_tot	13.5 ± 0.10
r_tot	13.0 ± 0.10
B_tot	13.8 ± 0.15
V_tot	13.2 ± 0.15
M_V	− 12.4 ± 0.20
L_V		total V luminosity
V_h	− 25 ± 5 km s^-1	^e
V_g	+ 17 km s^-1	galactocentric velocity^f
M_stars	1.6 ± 0.3 × 10⁷ M_⊙	stellar mass^g
M _HI	8.7 × 10⁵ M_⊙	gaseous mass

Notes.

^(a)

Observed values, not corrected for extinction (note that the correction is smaller than the uncertainty on SB in all the passbands considered here).

^(b)

is the elliptical radius containing half of the galaxy light.

^(c)

μ_r(R_ϵ < R_e) is the SB within the ellipse of that radius; note that this is the quantity that must be used in Fundamental Plane plots, not the SB at R_e, see Gadotti (2009).

^(d)

r_h is the radius of the circular area containing half of the galaxy light; the same value is consistently obtained from both g and r images.

^(e)

Mean systemic heliocentric radial velocity derived from H i observations.

^(f)

Adopting the solar motion from Schönrich, Binney & Dehnen (2010) and V_rot = 220 km s^-1.

^(g)

Adopting . B an V magnitudes have been obtained from their g and r counterparts using Eqs. (4) and (3).

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