Lessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey

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dc.contributor.authorRong, Yu
dc.contributor.authorZhu, Kai
dc.contributor.authorJohnston, Evelyn J.
dc.contributor.authorZhang, Hong-Xin
dc.contributor.authorCao, Tianwen
dc.contributor.authorPuzia, Thomas H.
dc.contributor.authorGalaz, Gaspar
dc.date.accessioned2025-01-23T19:49:04Z
dc.date.available2025-01-23T19:49:04Z
dc.date.issued2020
dc.description.abstractWe investigate the on-average properties for 28 star-forming ultra-diffuse galaxies (UDGs) located in low-density environments, by stacking their spectra from the Sloan Digital Sky Survey. These relatively isolated UDGs, with stellar masses of log(10) (M-*/M-circle dot) similar to 8.57 +/- 0.29, have the on-average total stellar metallicity [M/H] similar to -0.82 +/- 0.14, iron metallicity [Fe/H] similar to -1.00 +/- 0.16, stellar age t(*) similar to 5.2 +/- 0.5 Gyr, alpha-enhancement [alpha/Fe] similar to 0.24 +/- 0.10, and oxygen abundance 12+log(O/H) similar to 8.16 +/- 0.06, as well as central stellar velocity dispersion 54 +/- 12 km s(-1). On the star formation rate versus stellar mass diagram, these UDGs are located lower than the extrapolated star-forming main sequence from the massive spirals, but roughly follow the main sequence of low-surface-brightness dwarf galaxies. We find that these star-forming UDGs are not particularly metal-poor or metal-rich for their stellar masses, as compared with the metallicity-mass relations of the nearby typical dwarfs. With the UDG data of this work and previous studies, we also find a coarse correlation between [Fe/H] and magnesium-element enhancement [Mg/Fe] for UDGs: [Mg/Fe] similar or equal to -0.43(+/- 0.26) [Fe/H] -0.14(+/- 0.40).
dc.fuente.origenWOS
dc.identifier.doi10.3847/2041-8213/aba8aa
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/aba8aa
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100478
dc.identifier.wosidWOS:000560727800001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal letters
dc.rightsacceso restringido
dc.subjectDwarf galaxies
dc.subjectGalaxy evolution
dc.subjectSpectroscopy
dc.titleLessons on Star-forming Ultra-diffuse Galaxies from the Stacked Spectra of the Sloan Digital Sky Survey
dc.typeartículo
dc.volumen899
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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