Spiral galaxies with unusual azimuthal asymmetry in oxygen abundance

Open Access

Table 1.

Characteristics ^(a) of the MaNGA galaxies of our sample.

Galaxy	d	log M_⋆	R₂₅	(O/H)_h	(O/H)_l	(O/H)₀	grad	d(O/H)_asym	SFR	Environment
ID	Mpc	M_⊙	Kpc	12+log(O/H)	12+log(O/H)	12+log(O/H)	dex/R₂₅	dex	M_⊙/year

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)
8450 12701	197.4	10.1	9.47	8.586	8.501	8.586 ^(b)	−0.098	0.041	–0.304	Isolated
8546 12704	210.5	10.4	10.51	8.592	8.519	8.588	−0.089	0.069	0.275	multu
8561 12701	210.2	10.4	13.15	8.597	8.522	8.581	−0.090	0.053	0.038	Isolated
9500 09102	193.7	10.2	9.77	8.597	8.534	8.580	−0.062	0.042	0.083	Isolated
11761 12705	128.6	11.6	27.56	8.555	8.491	8.586	−0.128	0.030	0.362	multu

Notes.

Distance to the galaxy d, stellar mass M_⋆, optical (or isophotal) radius R₂₅, oxygen abundances of the high (O/H)_h and the low (O/H)_l metallicity regions, central oxygen abundance in the galaxy (O/H)₀, slope of the metallicity gradient, value of the global azimuthal asymmetry for the whole galaxy d(O/H)_asym, current star formation rate (SFR), and environment.

The radial abundance distribution in M-8450-12701 is described by broken relation with the central abundance of (O/H)₀ = 8.586 and gradient of −0.098 dex $R_{25}^{- 1}$ $R_{25}^{-1}$ at R/R₂₅ < 0.77 and (O/H)₀ = 8.829 and gradient of −0.415 dex $R_{25}^{- 1}$ $R_{25}^{-1}$ at R/R₂₅ > 0.77.

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