Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 안덕근 | * |
dc.date.accessioned | 2019-07-22T16:30:25Z | - |
dc.date.available | 2019-07-22T16:30:25Z | - |
dc.date.issued | 2019 | * |
dc.identifier.issn | 2041-8205 | * |
dc.identifier.issn | 2041-8213 | * |
dc.identifier.other | OAK-24983 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/250133 | - |
dc.description.abstract | I present the mean metallicity distribution of stars in the Milky Way based on photometry from the Sloan Digital Sky Survey. I utilize an empirically calibrated set of stellar isochrones developed in previous work to estimate the metallicities of individual stars to a precision of 0.2 dex for reasonably bright stars across the survey area. I also obtain more precise metallicity estimates using priors from the Gaia parallaxes for relatively nearby stars. Close to the Galactic mid-plane (vertical bar Z vertical bar < 2 kpc), a mean metallicity map reveals deviations from the mirror symmetry between the northern and southern hemispheres, displaying wave-like oscillations. The observed metallicity asymmetry structure is almost parallel to the Galactic mid-plane, and coincides with the previously known asymmetry in the stellar number density distribution. This result reinforces the previous notion of the plane-parallel vertical waves propagating through the disk, in which a local metallicity perturbation from the mean vertical metallicity gradient is induced by the phase-space wrapping of stars in the Z-V-Z plane. The maximum amplitude of the metallicity asymmetry (Delta[Fe/H] similar to 0.05) implies that these stars have been pulled away from the Galactic mid-plane by an order of Delta vertical bar Z vertical bar similar to 80 pc as a massive halo substructure such as the Sagittarius dwarf galaxy plunged through the Milky Way. This work provides evidence that the Gaia phase-space spiral may continue out to vertical bar Z vertical bar similar to 1.5 kpc. | * |
dc.language | English | * |
dc.publisher | IOP PUBLISHING LTD | * |
dc.subject | Galaxy: abundances | * |
dc.subject | Galaxy: disk | * |
dc.subject | Galaxy: structure | * |
dc.subject | stars: abundances | * |
dc.title | Asymmetric Mean Metallicity Distribution of the Milky Way's Disk | * |
dc.type | Article | * |
dc.relation.issue | 2 | * |
dc.relation.volume | 878 | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.journaltitle | ASTROPHYSICAL JOURNAL LETTERS | * |
dc.identifier.doi | 10.3847/2041-8213/ab2467 | * |
dc.identifier.wosid | WOS:000471732800005 | * |
dc.author.google | An, Deokkeun | * |
dc.contributor.scopusid | 안덕근(8661118800) | * |
dc.date.modifydate | 20240130115827 | * |