| Autor: |
Erin Boettcher, Edmund Hodges-Kluck |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 974, Iss 2, p 272 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad6902 |
| Popis: |
Circumgalactic dust grains trace the circulation of mass and metals between star-forming regions and gaseous galactic halos, giving insight into feedback and tidal stripping processes. We perform a search for ultraviolet (UV) reflection nebulae produced by extraplanar dust around 551 nearby ( D < 100 Mpc), edge-on disk galaxies using archival near-ultraviolet and far-ultraviolet images from the Galaxy Evolution Explorer (GALEX), accounting for the point-spread function (FWHM = 4″–5″). We detect extraplanar emission ubiquitously in stacks of galaxies binned by morphology and star formation rate, with scale heights of h _h = 1–2.3 kpc and ≈10% of the total (reddened) flux in the galaxy found beyond the B -band isophotal level of μ _B = 25 mag arcsec ^−2 . This emission is detected in 7% of the individual galaxies, and an additional one-third have at least 5% of their total flux found beyond μ _B = 25 mag arcsec ^−2 in a disk component. The extraplanar luminosities and colors are consistent with reflection nebulae rather than stellar halos and indicate that, on average, disk galaxies have an extraplanar dust mass of 5%–15% of that in their interstellar medium. This suggests that recycled material composes at least a third of the inner circumgalactic medium ( R < 10 kpc) in ∼ L * galaxies. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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