A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles
The resolved mass assembly of Milky Way–mass galaxies has been previously studied in simulations, the local Universe, and at higher redshifts using infrared (IR) light profiles. To better characterize the mass assembly of Milky Way analogs (MWAs), as well as their changes in star formation rate (SFR...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad2c90 |
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| author | Vivian Yun Yan Tan Adam Muzzin Danilo Marchesini Visal Sok Ghassan T. E. Sarrouh Z. Cemile Marsan |
| author_facet | Vivian Yun Yan Tan Adam Muzzin Danilo Marchesini Visal Sok Ghassan T. E. Sarrouh Z. Cemile Marsan |
| author_sort | Vivian Yun Yan Tan |
| collection | DOAJ |
| description | The resolved mass assembly of Milky Way–mass galaxies has been previously studied in simulations, the local Universe, and at higher redshifts using infrared (IR) light profiles. To better characterize the mass assembly of Milky Way analogs (MWAs), as well as their changes in star formation rate (SFR) and color gradients, we construct resolved stellar mass and SFR maps of MWA progenitors selected with abundance matching techniques up to z ∼2 using deep, multiwavelength imaging data from the Hubble Frontier Fields. Our results using stellar mass profiles agree well with previous studies that utilize IR light profiles, showing that the inner 2 kpc of the galaxies and the regions beyond 2 kpc exhibit similar rates of stellar mass growth. This indicates the progenitors of MWAs from z ∼ 2 to the present do not preferentially grow their bulges or their disks. The evolution of the SFR profiles indicates a greater decrease in SFR density in the inner regions versus the outer regions. Sérsic parameters indicate modest growth in the central regions at lower redshifts, perhaps indicating slight bulge growth. However, the Sérsic index does not rise above n ∼ 2 until z < 0.5, meaning these galaxies are still disk-dominated systems. We find that the half-mass radii of the MWA progenitors increase between 1.5 < z < 2, but remain constant at later epochs ( z < 1.5). This implies mild bulge growth since z ∼ 2 in MWA progenitors, in line with previous MWA mass assembly studies. |
| first_indexed | 2024-04-24T16:36:43Z |
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| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T16:36:43Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-fa1ce22002994280a1d062fb607625422024-03-29T15:26:40ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01964217710.3847/1538-4357/ad2c90A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate ProfilesVivian Yun Yan Tan0https://orcid.org/0000-0002-3503-8899Adam Muzzin1https://orcid.org/0000-0002-9330-9108Danilo Marchesini2https://orcid.org/0000-0001-9002-3502Visal Sok3https://orcid.org/0000-0003-0780-9526Ghassan T. E. Sarrouh4https://orcid.org/0000-0001-8830-2166Z. Cemile Marsan5https://orcid.org/0000-0002-7248-1566Department of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON, M3J 1P3, CanadaDepartment of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON, M3J 1P3, CanadaDepartment of Physics and Astronomy, Tufts University , 574 Boston Avenue, MA 02155, USADepartment of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON, M3J 1P3, CanadaDepartment of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON, M3J 1P3, CanadaDepartment of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON, M3J 1P3, CanadaThe resolved mass assembly of Milky Way–mass galaxies has been previously studied in simulations, the local Universe, and at higher redshifts using infrared (IR) light profiles. To better characterize the mass assembly of Milky Way analogs (MWAs), as well as their changes in star formation rate (SFR) and color gradients, we construct resolved stellar mass and SFR maps of MWA progenitors selected with abundance matching techniques up to z ∼2 using deep, multiwavelength imaging data from the Hubble Frontier Fields. Our results using stellar mass profiles agree well with previous studies that utilize IR light profiles, showing that the inner 2 kpc of the galaxies and the regions beyond 2 kpc exhibit similar rates of stellar mass growth. This indicates the progenitors of MWAs from z ∼ 2 to the present do not preferentially grow their bulges or their disks. The evolution of the SFR profiles indicates a greater decrease in SFR density in the inner regions versus the outer regions. Sérsic parameters indicate modest growth in the central regions at lower redshifts, perhaps indicating slight bulge growth. However, the Sérsic index does not rise above n ∼ 2 until z < 0.5, meaning these galaxies are still disk-dominated systems. We find that the half-mass radii of the MWA progenitors increase between 1.5 < z < 2, but remain constant at later epochs ( z < 1.5). This implies mild bulge growth since z ∼ 2 in MWA progenitors, in line with previous MWA mass assembly studies.https://doi.org/10.3847/1538-4357/ad2c90Galaxy evolutionMilky Way evolutionHigh-redshift galaxiesGalaxies |
| spellingShingle | Vivian Yun Yan Tan Adam Muzzin Danilo Marchesini Visal Sok Ghassan T. E. Sarrouh Z. Cemile Marsan A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles The Astrophysical Journal Galaxy evolution Milky Way evolution High-redshift galaxies Galaxies |
| title | A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles |
| title_full | A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles |
| title_fullStr | A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles |
| title_full_unstemmed | A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles |
| title_short | A Measurement of the Assembly of Milky Way Analogs at Redshifts 0.5 < z < 2 with Resolved Stellar Mass and Star Formation Rate Profiles |
| title_sort | measurement of the assembly of milky way analogs at redshifts 0 5 z 2 with resolved stellar mass and star formation rate profiles |
| topic | Galaxy evolution Milky Way evolution High-redshift galaxies Galaxies |
| url | https://doi.org/10.3847/1538-4357/ad2c90 |
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