No assembly required: mergers are mostly irrelevant for the growth of low-mass dwarf galaxies
نویسندگان
چکیده
منابع مشابه
The Baryon Content of Extremely Low Mass Dwarf Galaxies
We investigate the gas content and baryonic Tully-Fisher relationship for extremely low luminosity dwarf galaxies in the absolute magnitude range−13.5 > Mr − 5 log10 h70 > −16. The sample is selected from the Sloan Digital Sky Survey and consists of 101 galaxies for which we have obtained follow-up HI observations using the Arecibo Observatory and Green Bank Telescope. This represents the large...
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We examine the properties of a morphologically-selected sample of 0.4 < z < 1.0 spheroidal galaxies in the GOODS fields in order to ascertain whether their increase in abundance with time arises primarily frommergers. To address this question we determine scaling relations between the dynamical mass Mdyn, determined from stellar velocity dispersions, and the stellar mass M∗, determined from opt...
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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...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty1488