Pavo: Stellar feedback in action in a low-mass dwarf galaxy
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912503679680512 |
|---|---|
| author | Jones, Michael G. Rey, Martin P. Sand, David J. Spekkens, Kristine Mutlu-Pakdil, Burcin Adams, Elizabeth A. K. Bennet, Paul Crnojevic, Denija Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Healy, Julia Hunter, Laura C. Karunakaran, Ananthan Prabhu, Deepthi S. Zaritsky, Dennis |
| author_facet | Jones, Michael G. Rey, Martin P. Sand, David J. Spekkens, Kristine Mutlu-Pakdil, Burcin Adams, Elizabeth A. K. Bennet, Paul Crnojevic, Denija Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Healy, Julia Hunter, Laura C. Karunakaran, Ananthan Prabhu, Deepthi S. Zaritsky, Dennis |
| contents | MeerKAT observations of the recently discovered, extremely low mass galaxy, Pavo, have revealed a neutral gas (HI) reservoir that was undetected in archival HI single dish data. We measure Pavo's HI mass as $\log M_\mathrm{HI}/\mathrm{M_\odot} = 5.79 \pm 0.05$, making it the lowest mass HI reservoir currently known in an isolated galaxy (with a robust distance measurement). Despite Pavo's extreme isolation, with no known neighbor within over 700 kpc, its HI reservoir is highly disturbed. It does not show clear signs of rotation and its center of mass is offset from the stellar body center by 320 pc, while its peak is offset by 82 pc (both in projection). Despite this disturbed morphology, Pavo still appears to be consistent with the HI size--mass relation, although it is not possible to accurately determine a suitable inclination correction. Such disturbed, offset and disorganized HI reservoirs are predicted by simulations of low-mass, star-forming dwarfs in which supernova-driven outflows efficiently disrupt the interstellar medium after a star formation event. It is likely that we are witnessing Pavo in precisely this period, tens to a few hundred Myr after a star formation episode, when internal feedback has disrupted its gas reservoir. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06424 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pavo: Stellar feedback in action in a low-mass dwarf galaxy Jones, Michael G. Rey, Martin P. Sand, David J. Spekkens, Kristine Mutlu-Pakdil, Burcin Adams, Elizabeth A. K. Bennet, Paul Crnojevic, Denija Doliva-Dolinsky, Amandine Donnerstein, Richard Fielder, Catherine E. Healy, Julia Hunter, Laura C. Karunakaran, Ananthan Prabhu, Deepthi S. Zaritsky, Dennis Astrophysics of Galaxies MeerKAT observations of the recently discovered, extremely low mass galaxy, Pavo, have revealed a neutral gas (HI) reservoir that was undetected in archival HI single dish data. We measure Pavo's HI mass as $\log M_\mathrm{HI}/\mathrm{M_\odot} = 5.79 \pm 0.05$, making it the lowest mass HI reservoir currently known in an isolated galaxy (with a robust distance measurement). Despite Pavo's extreme isolation, with no known neighbor within over 700 kpc, its HI reservoir is highly disturbed. It does not show clear signs of rotation and its center of mass is offset from the stellar body center by 320 pc, while its peak is offset by 82 pc (both in projection). Despite this disturbed morphology, Pavo still appears to be consistent with the HI size--mass relation, although it is not possible to accurately determine a suitable inclination correction. Such disturbed, offset and disorganized HI reservoirs are predicted by simulations of low-mass, star-forming dwarfs in which supernova-driven outflows efficiently disrupt the interstellar medium after a star formation event. It is likely that we are witnessing Pavo in precisely this period, tens to a few hundred Myr after a star formation episode, when internal feedback has disrupted its gas reservoir. |
| title | Pavo: Stellar feedback in action in a low-mass dwarf galaxy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.06424 |