You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum
Observed breakBRD (“break bulges in red disks”) galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star formation in their centers as measured by the D _n 4000 spectral index. In Kopenhafer et al., a comparabl...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acd3ee |
| _version_ | 1797695456594100224 |
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| author | Stephanie Tonnesen Daniel DeFelippis Sarah Tuttle |
| author_facet | Stephanie Tonnesen Daniel DeFelippis Sarah Tuttle |
| author_sort | Stephanie Tonnesen |
| collection | DOAJ |
| description | Observed breakBRD (“break bulges in red disks”) galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star formation in their centers as measured by the D _n 4000 spectral index. In Kopenhafer et al., a comparable population of breakBRD analogs was identified in the TNG simulation, in which the central concentration of star formation was found to reflect a central concentration of dense, star-forming gas caused by a lack of dense gas in the galaxy outskirts. In this paper, we examine the circumgalactic medium of the central breakBRD analogs to determine if the extended halo gas also shows differences from that around comparison galaxies with comparable stellar mass. We examine the circumgalactic medium gas mass, specific angular momentum, and metallicity in these galaxy populations. We find less gas in the circumgalactic medium of breakBRD galaxies, and that the breakBRD circumgalactic medium is slightly more concentrated than that of comparable M _* galaxies. In addition, we find that the angular momentum in the circumgalactic medium of breakBRD galaxies tends to be low for their stellar mass, and shows more misalignment to the angular momentum vector of the stellar disk. Finally, we find that the circumgalactic medium metallicity of breakBRD galaxies tends to be high for their stellar mass. Together with their low star formation rate, we argue that these circumgalactic medium properties indicate a small amount of disk feeding concentrated in the central regions and a lack of low-metallicity gas accretion from the intergalactic medium. |
| first_indexed | 2024-03-12T03:11:42Z |
| format | Article |
| id | doaj.art-eb1bd53f5672458ba502ca2e1ab66124 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:11:42Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-eb1bd53f5672458ba502ca2e1ab661242023-09-03T14:24:35ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195111610.3847/1538-4357/acd3eeYou Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular MomentumStephanie Tonnesen0https://orcid.org/0000-0002-8710-9206Daniel DeFelippis1https://orcid.org/0000-0002-0112-7690Sarah Tuttle2https://orcid.org/0000-0002-7327-565XCCA, Flatiron Institute , 162 5th Avenue, New York, NY 10010, USA ; stonnesen@flatironinstitute.orgUniversité Paris-Saclay, Université Paris Cité , CEA, CNRS, AIM, F-91191, Gif-sur-Yvette, FranceUniversity of Washington , Seattle, Physics and Astronomy Building, Seattle, WA 98195, USAObserved breakBRD (“break bulges in red disks”) galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star formation in their centers as measured by the D _n 4000 spectral index. In Kopenhafer et al., a comparable population of breakBRD analogs was identified in the TNG simulation, in which the central concentration of star formation was found to reflect a central concentration of dense, star-forming gas caused by a lack of dense gas in the galaxy outskirts. In this paper, we examine the circumgalactic medium of the central breakBRD analogs to determine if the extended halo gas also shows differences from that around comparison galaxies with comparable stellar mass. We examine the circumgalactic medium gas mass, specific angular momentum, and metallicity in these galaxy populations. We find less gas in the circumgalactic medium of breakBRD galaxies, and that the breakBRD circumgalactic medium is slightly more concentrated than that of comparable M _* galaxies. In addition, we find that the angular momentum in the circumgalactic medium of breakBRD galaxies tends to be low for their stellar mass, and shows more misalignment to the angular momentum vector of the stellar disk. Finally, we find that the circumgalactic medium metallicity of breakBRD galaxies tends to be high for their stellar mass. Together with their low star formation rate, we argue that these circumgalactic medium properties indicate a small amount of disk feeding concentrated in the central regions and a lack of low-metallicity gas accretion from the intergalactic medium.https://doi.org/10.3847/1538-4357/acd3eeCircumgalactic mediumHydrodynamical simulationsGalaxy evolution |
| spellingShingle | Stephanie Tonnesen Daniel DeFelippis Sarah Tuttle You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum The Astrophysical Journal Circumgalactic medium Hydrodynamical simulations Galaxy evolution |
| title | You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum |
| title_full | You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum |
| title_fullStr | You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum |
| title_full_unstemmed | You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum |
| title_short | You Are What You Eat: The Circumgalactic Medium around BreakBRD Galaxies Has Low Mass and Angular Momentum |
| title_sort | you are what you eat the circumgalactic medium around breakbrd galaxies has low mass and angular momentum |
| topic | Circumgalactic medium Hydrodynamical simulations Galaxy evolution |
| url | https://doi.org/10.3847/1538-4357/acd3ee |
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