16679
收藏DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16679.html
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Either the Milky Way.s ionized CGM is an outlier compared to the CGM of other L* galaxies comma or our primary method used to measure its content - hundreds of QSO sightlines that pierce its halo - is fundamentally biased. The latter possibility cannot yet be convincingly ruled out because 95% of existing UV-bright QSO sightlines with archival high-resolution UV spectra lie at Galactic latitudes |b| > 25 degrees. We now have a unique opportunity to address this huge low-latitude gap in UV-bright QSO lines of sight with our proposed sample of newly discovered comma rare QSOs at |b| < 25 degrees. We argue that a key requirement to determining the structure comma mass comma and dynamics of the CGM is understanding its distribution along the disk axis. For the first time comma we will be able to use these novel Milky Way sightlines to test the latest hydrodynamical comma cosmological simulations that suggest extended comma ionized disk-like structures in galaxies may persist out to virgul100 kpc. Our study comma which will combine high-resolution HST-COS G160M spectra of these new low-|b| QSOs with > 100 high-quality archival G160M QSO spectra comma is designed to address two primary questionsdoublePoint (1) With an unbiased view of the halo comma is the Milky Way truly an anomalyquestionMark (2) Does the MWCGM show evidence for an extended comma outer comma ionized disk morphology comma and if so comma what are its propertiesquestionMark Finally comma if we find evidence for an extended disk comma it would represent one of the largest structures on the sky ever discovered comma covering nearly half of the sky.
提供机构:
European Space Agency
创建时间:
2023-04-21



