Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy
MeerKAT observations of the recently discovered, extremely low mass galaxy Pavo have revealed a neutral gas (H i ) reservoir that was undetected in archival H i single dish data. We measure Pavo’s H i mass as ${\mathrm{log}}\,{M}_{{\mathrm{HI}}}/{M}_{\odot }=5.79\pm 0.05$ , making it the lowest mass...
| الحاوية / القاعدة: | The Astrophysical Journal |
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| المؤلفون الرئيسيون: | , , , , , , , , , , , , , , , |
| التنسيق: | مقال |
| اللغة: | الإنجليزية |
| منشور في: |
IOP Publishing
2025-01-01
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://doi.org/10.3847/1538-4357/adf6ab |
| _version_ | 1849292343448961024 |
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| author | Michael G. Jones Martin P. Rey David J. Sand Kristine Spekkens Burçin Mutlu-Pakdil Elizabeth A. K. Adams Paul Bennet Denija Crnojević Amandine Doliva-Dolinsky Richard Donnerstein Catherine E. Fielder Julia Healy Laura C. Hunter Ananthan Karunakaran Deepthi S. Prabhu Dennis Zaritsky |
| author_facet | Michael G. Jones Martin P. Rey David J. Sand Kristine Spekkens Burçin Mutlu-Pakdil Elizabeth A. K. Adams Paul Bennet Denija Crnojević Amandine Doliva-Dolinsky Richard Donnerstein Catherine E. Fielder Julia Healy Laura C. Hunter Ananthan Karunakaran Deepthi S. Prabhu Dennis Zaritsky |
| author_sort | Michael G. Jones |
| collection | DOAJ |
| container_title | The Astrophysical Journal |
| description | MeerKAT observations of the recently discovered, extremely low mass galaxy Pavo have revealed a neutral gas (H i ) reservoir that was undetected in archival H i single dish data. We measure Pavo’s H i mass as ${\mathrm{log}}\,{M}_{{\mathrm{HI}}}/{M}_{\odot }=5.79\pm 0.05$ , making it the lowest mass H i 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 H i 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 H i size–mass relation, although it is not possible to accurately determine a suitable inclination correction. Such disturbed, offset, and disorganized H i 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 (SF) event. It is likely that we are witnessing Pavo in precisely this period, tens to a few hundred Myr after a SF episode, when internal feedback has disrupted its gas reservoir. |
| format | Article |
| id | doaj-art-e89e9ec72e754f5ab50dd5d5090e0d27 |
| institution | Directory of Open Access Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| spelling | doaj-art-e89e9ec72e754f5ab50dd5d5090e0d272025-09-05T06:26:23ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01990216410.3847/1538-4357/adf6abPavo: Stellar Feedback in Action in a Low-mass Dwarf GalaxyMichael G. Jones0https://orcid.org/0000-0002-5434-4904Martin P. Rey1https://orcid.org/0000-0002-1515-995XDavid J. Sand2https://orcid.org/0000-0003-4102-380XKristine Spekkens3https://orcid.org/0000-0002-0956-7949Burçin Mutlu-Pakdil4https://orcid.org/0000-0001-9649-4815Elizabeth A. K. Adams5https://orcid.org/0000-0002-9798-5111Paul Bennet6https://orcid.org/0000-0001-8354-7279Denija Crnojević7https://orcid.org/0000-0002-1763-4128Amandine Doliva-Dolinsky8https://orcid.org/0000-0001-9775-9029Richard Donnerstein9https://orcid.org/0000-0001-7618-8212Catherine E. Fielder10https://orcid.org/0000-0001-8245-779XJulia Healy11https://orcid.org/0000-0003-1020-8684Laura C. Hunter12https://orcid.org/0000-0001-5368-3632Ananthan Karunakaran13https://orcid.org/0000-0001-8855-3635Deepthi S. Prabhu14https://orcid.org/0000-0002-8217-5626Dennis Zaritsky15https://orcid.org/0000-0002-5177-727XSteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USADepartment of Physics, University of Bath , Claverton Down, Bath, BA2 7AY, UKSteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USADepartment of Physics, Engineering Physics and Astronomy, Queen’s University , Kingston, ON K7L 3N6, CanadaDepartment of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USAASTRON , the Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands; Kapteyn Astronomical Institute, University of Groningen , PO Box 800, 9700 AV Groningen, The NetherlandsSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USAUniversity of Tampa , 401 West Kennedy Boulevard, Tampa, FL 33606, USADepartment of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USA; Department of Physics, University of Surrey , Guildford GU2 7XH, UKSteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USASteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USAJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, UKDepartment of Physics and Astronomy, Dartmouth College , 6127 Wilder Laboratory, Hanover, NH 03755, USADepartment of Astronomy & Astrophysics, University of Toronto , Toronto, ON M5S 3H4, Canada; Dunlap Institute for Astronomy and Astrophysics, University of Toronto , Toronto ON, M5S 3H4, CanadaSteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USASteward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USAMeerKAT observations of the recently discovered, extremely low mass galaxy Pavo have revealed a neutral gas (H i ) reservoir that was undetected in archival H i single dish data. We measure Pavo’s H i mass as ${\mathrm{log}}\,{M}_{{\mathrm{HI}}}/{M}_{\odot }=5.79\pm 0.05$ , making it the lowest mass H i 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 H i 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 H i size–mass relation, although it is not possible to accurately determine a suitable inclination correction. Such disturbed, offset, and disorganized H i 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 (SF) event. It is likely that we are witnessing Pavo in precisely this period, tens to a few hundred Myr after a SF episode, when internal feedback has disrupted its gas reservoir.https://doi.org/10.3847/1538-4357/adf6abDwarf irregular galaxiesLow surface brightness galaxiesGalaxy evolutionInterstellar atomic gas |
| spellingShingle | Michael G. Jones Martin P. Rey David J. Sand Kristine Spekkens Burçin Mutlu-Pakdil Elizabeth A. K. Adams Paul Bennet Denija Crnojević Amandine Doliva-Dolinsky Richard Donnerstein Catherine E. Fielder Julia Healy Laura C. Hunter Ananthan Karunakaran Deepthi S. Prabhu Dennis Zaritsky Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy Dwarf irregular galaxies Low surface brightness galaxies Galaxy evolution Interstellar atomic gas |
| title | Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy |
| title_full | Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy |
| title_fullStr | Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy |
| title_full_unstemmed | Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy |
| title_short | Pavo: Stellar Feedback in Action in a Low-mass Dwarf Galaxy |
| title_sort | pavo stellar feedback in action in a low mass dwarf galaxy |
| topic | Dwarf irregular galaxies Low surface brightness galaxies Galaxy evolution Interstellar atomic gas |
| url | https://doi.org/10.3847/1538-4357/adf6ab |
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