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2013ApJ...779..102K - Astrophys. J., 779, 102 (2013/December-3)

The universal stellar mass-stellar metallicity relation for dwarf galaxies.


Abstract (from CDS):

We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular galaxies (dIrrs), and we show that dIrrs obey the same mass-metallicity relation as the dwarf spheroidal (dSph) satellites of both the Milky Way and M31: Z* ∝ M*0.30±0.02. The uniformity of the relation is in contradiction to previous estimates of metallicity based on photometry. This relationship is roughly continuous with the stellar mass-stellar metallicity relation for galaxies as massive as M*= 1012 M. Although the average metallicities of dwarf galaxies depend only on stellar mass, the shapes of their metallicity distributions depend on galaxy type. The metallicity distributions of dIrrs resemble simple, leaky box chemical evolution models, whereas dSphs require an additional parameter, such as gas accretion, to explain the shapes of their metallicity distributions. Furthermore, the metallicity distributions of the more luminous dSphs have sharp, metal-rich cut-offs that are consistent with the sudden truncation of star formation due to ram pressure stripping.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: fundamental parameters - galaxies: irregular - Local Group

VizieR on-line data: <Available at CDS (J/ApJ/779/102): table1.dat table2.dat table3.dat>

Nomenclature: Table 3: [KCG2013] IC 1613 B07-NNNNN N=125 among (Nos 23-56255), [KCG2013] LeoA NNNNN N=40 among (Nos 29587-33495), [KCG2013] LeoIV NNN NNN N=12 among (Nos 383 212 to 384 402), [KCG2013] ComBer NNN NNNaa N=27, [KCG2013] CVnII NNN NNN N=15 among (Nos 499 14 to 499 661), [KCG2013] Herc NNN NNNN N=21 among (Nos 307 804 to 309 663), [KCG2013] LeoT NNNNNNN N=17 among (Nos 3724854-5902175), [KCG2013] NGC 6822 M07-NNNNN N=279 among (Nos 9512-42197), [KCG2013] Aqr NNNN N=25 among (Nos 126-1928), [KCG2013] Peg NNNNNN N=95 among (Nos 257760-389527), [KCG2013] Seg2 NNNNNNNNNN N=8 among (Nos 1523726352-2025699475), [KCG2013] UmaI NN NNNa N=37, [KCG2013] UmaII NNN NNNa N=12 among (Nos 176 69 to 176 317, 200 10 to 200 254, 200 158a, 200 180a, 201 219). Table 3: [KGS2010] For NNNNNNN (Nos 17865, 27294, 35520) added, [KGS2010] LeoI NNNNNNN (Nos 60123, 22812) added, [KGS2010] UMi NNNNNNN (Nos 41977, 14035) added, [KGS2010] Dra NNNNNNN (Nos 644381, 630386, 649402, 591744, 662442, 411280) added, [KGS2010] CVnI NNN NNNNaaa (Nos 542 147b, 542 822, 542 965, 542 1076, 542 1060) added.

Simbad objects: 3744

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