SIMBAD references

2025AJ....170...76H - Astron. J., 170, 76 (2025/August-0)

Ultradeep Imaging of Nearby Dwarf Irregular Galaxies: Young Objects in the Far Outer Disk.

HUNTER D.A., ZHANG H.-X., ELMEGREEN B.G., CASTELLOE E.R., LEDFORD H.M., NISLEY I. and HATANO R.

Abstract (from CDS):

Ultradeep UBVI imaging of 10 nearby (≤7.8 Mpc) noninteracting dwarf irregular galaxies are used to examine their far outer stellar disks. The annulus between 26 mag arcsec–2 and 29 mag arcsec–2 in the V band is what we define as the far outer disk and is our focus here. Photometry of distinct objects in the far outer disks, including far-UV images, is used to determine ages of the objects in order to look for those that are young. In three of the galaxies we find objects with high-confidence ages ≤30 Myr. These objects are too young to have scattered into the far outer disk from the central regions. Therefore, they likely formed in situ. How star-forming gas clouds formed in the extreme environment of the outer stellar disks of dwarfs is a primary unanswered question.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dwarf irregular galaxies - Star formation - Galaxy evolution

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 19

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2025AJ....170...76H and select 'bookmark this link' or equivalent in the popup menu