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Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment
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| Zeitschriftentitel: | The Astrophysical Journal |
|---|---|
| Personen und Körperschaften: | , , , , , , , , , |
| In: | The Astrophysical Journal, 877, 2019, 2, S. 141 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
American Astronomical Society
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| Schlagwörter: |
| author_facet |
Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. |
|---|---|
| author |
Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. |
| spellingShingle |
Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. The Astrophysical Journal Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
morishita, t. |
| spelling |
Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. 0004-637X 1538-4357 American Astronomical Society Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.3847/1538-4357/ab1d53 <jats:title>Abstract</jats:title> <jats:p>Observations have revealed massive (<jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{M}_{* }/{M}_{\odot }\gtrsim 11$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>) galaxies that were already dead when the universe was only ∼2 Gyr. Given the short time before these galaxies were quenched, their past histories and quenching mechanism(s) are of particular interest. In this paper, we study star formation histories (SFHs) of 24 massive galaxies at 1.6 < <jats:italic>z</jats:italic> < 2.5. A deep slitless spectroscopy and imaging data set collected from multiple <jats:italic>Hubble Space Telescope</jats:italic> surveys allows robust determination of their spectral energy distributions and SFHs with no functional assumption on their forms. We find that most of our massive galaxies had formed >50% of their extant masses by ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier. Their stellar-phase metallicities are already compatible with those of local early-type galaxies, with a median value of <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }=0.25$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> and scatter of ∼0.15 dex. In combination with the reconstructed SFHs, we reveal their rapid metallicity evolution from <jats:italic>z</jats:italic> ∼ 5.5 to ∼2.2 at a rate of ∼0.2 dex Gyr<jats:sup>−1</jats:sup> in <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn3.gif" xlink:type="simple" /> </jats:inline-formula>. Interestingly, the inferred stellar-phase metallicities are, when compared at half-mass time, ∼0.25 dex higher than observed gas-phase metallicities of star-forming galaxies. While systematic uncertainties remain, this may imply that these quenched galaxies have continued low-level star formation, rather than abruptly terminating their star formation activity, and kept enhancing their metallicity until recently.</jats:p> Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment The Astrophysical Journal |
| doi_str_mv |
10.3847/1538-4357/ab1d53 |
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Online Free |
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Physik Technik |
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ElectronicArticle |
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| imprint |
American Astronomical Society, 2019 |
| imprint_str_mv |
American Astronomical Society, 2019 |
| issn |
1538-4357 0004-637X |
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1538-4357 0004-637X |
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American Astronomical Society (CrossRef) |
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2019 |
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American Astronomical Society |
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ai |
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ai |
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The Astrophysical Journal |
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49 |
| title |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_unstemmed |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_full |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_fullStr |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_full_unstemmed |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_short |
Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_sort |
massive dead galaxies at z ∼ 2 with hst grism spectroscopy. i. star formation histories and metallicity enrichment |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.3847/1538-4357/ab1d53 |
| publishDate |
2019 |
| physical |
141 |
| description |
<jats:title>Abstract</jats:title>
<jats:p>Observations have revealed massive (<jats:inline-formula>
<jats:tex-math>
<?CDATA $\mathrm{log}{M}_{* }/{M}_{\odot }\gtrsim 11$?>
</jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn1.gif" xlink:type="simple" />
</jats:inline-formula>) galaxies that were already dead when the universe was only ∼2 Gyr. Given the short time before these galaxies were quenched, their past histories and quenching mechanism(s) are of particular interest. In this paper, we study star formation histories (SFHs) of 24 massive galaxies at 1.6 < <jats:italic>z</jats:italic> < 2.5. A deep slitless spectroscopy and imaging data set collected from multiple <jats:italic>Hubble Space Telescope</jats:italic> surveys allows robust determination of their spectral energy distributions and SFHs with no functional assumption on their forms. We find that most of our massive galaxies had formed >50% of their extant masses by ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier. Their stellar-phase metallicities are already compatible with those of local early-type galaxies, with a median value of <jats:inline-formula>
<jats:tex-math>
<?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }=0.25$?>
</jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn2.gif" xlink:type="simple" />
</jats:inline-formula> and scatter of ∼0.15 dex. In combination with the reconstructed SFHs, we reveal their rapid metallicity evolution from <jats:italic>z</jats:italic> ∼ 5.5 to ∼2.2 at a rate of ∼0.2 dex Gyr<jats:sup>−1</jats:sup> in <jats:inline-formula>
<jats:tex-math>
<?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }$?>
</jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn3.gif" xlink:type="simple" />
</jats:inline-formula>. Interestingly, the inferred stellar-phase metallicities are, when compared at half-mass time, ∼0.25 dex higher than observed gas-phase metallicities of star-forming galaxies. While systematic uncertainties remain, this may imply that these quenched galaxies have continued low-level star formation, rather than abruptly terminating their star formation activity, and kept enhancing their metallicity until recently.</jats:p> |
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| author | Morishita, T., Abramson, L. E., Treu, T., Brammer, G. B., Jones, T., Kelly, P., Stiavelli, M., Trenti, M., Vulcani, B., Wang, X. |
| author_facet | Morishita, T., Abramson, L. E., Treu, T., Brammer, G. B., Jones, T., Kelly, P., Stiavelli, M., Trenti, M., Vulcani, B., Wang, X., Morishita, T., Abramson, L. E., Treu, T., Brammer, G. B., Jones, T., Kelly, P., Stiavelli, M., Trenti, M., Vulcani, B., Wang, X. |
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| description | <jats:title>Abstract</jats:title> <jats:p>Observations have revealed massive (<jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{M}_{* }/{M}_{\odot }\gtrsim 11$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>) galaxies that were already dead when the universe was only ∼2 Gyr. Given the short time before these galaxies were quenched, their past histories and quenching mechanism(s) are of particular interest. In this paper, we study star formation histories (SFHs) of 24 massive galaxies at 1.6 < <jats:italic>z</jats:italic> < 2.5. A deep slitless spectroscopy and imaging data set collected from multiple <jats:italic>Hubble Space Telescope</jats:italic> surveys allows robust determination of their spectral energy distributions and SFHs with no functional assumption on their forms. We find that most of our massive galaxies had formed >50% of their extant masses by ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier. Their stellar-phase metallicities are already compatible with those of local early-type galaxies, with a median value of <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }=0.25$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> and scatter of ∼0.15 dex. In combination with the reconstructed SFHs, we reveal their rapid metallicity evolution from <jats:italic>z</jats:italic> ∼ 5.5 to ∼2.2 at a rate of ∼0.2 dex Gyr<jats:sup>−1</jats:sup> in <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn3.gif" xlink:type="simple" /> </jats:inline-formula>. Interestingly, the inferred stellar-phase metallicities are, when compared at half-mass time, ∼0.25 dex higher than observed gas-phase metallicities of star-forming galaxies. While systematic uncertainties remain, this may imply that these quenched galaxies have continued low-level star formation, rather than abruptly terminating their star formation activity, and kept enhancing their metallicity until recently.</jats:p> |
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| imprint | American Astronomical Society, 2019 |
| imprint_str_mv | American Astronomical Society, 2019 |
| institution | DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275 |
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| spelling | Morishita, T. Abramson, L. E. Treu, T. Brammer, G. B. Jones, T. Kelly, P. Stiavelli, M. Trenti, M. Vulcani, B. Wang, X. 0004-637X 1538-4357 American Astronomical Society Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.3847/1538-4357/ab1d53 <jats:title>Abstract</jats:title> <jats:p>Observations have revealed massive (<jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{M}_{* }/{M}_{\odot }\gtrsim 11$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>) galaxies that were already dead when the universe was only ∼2 Gyr. Given the short time before these galaxies were quenched, their past histories and quenching mechanism(s) are of particular interest. In this paper, we study star formation histories (SFHs) of 24 massive galaxies at 1.6 < <jats:italic>z</jats:italic> < 2.5. A deep slitless spectroscopy and imaging data set collected from multiple <jats:italic>Hubble Space Telescope</jats:italic> surveys allows robust determination of their spectral energy distributions and SFHs with no functional assumption on their forms. We find that most of our massive galaxies had formed >50% of their extant masses by ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier. Their stellar-phase metallicities are already compatible with those of local early-type galaxies, with a median value of <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }=0.25$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn2.gif" xlink:type="simple" /> </jats:inline-formula> and scatter of ∼0.15 dex. In combination with the reconstructed SFHs, we reveal their rapid metallicity evolution from <jats:italic>z</jats:italic> ∼ 5.5 to ∼2.2 at a rate of ∼0.2 dex Gyr<jats:sup>−1</jats:sup> in <jats:inline-formula> <jats:tex-math> <?CDATA $\mathrm{log}{Z}_{* }/{Z}_{\odot }$?> </jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apjab1d53ieqn3.gif" xlink:type="simple" /> </jats:inline-formula>. Interestingly, the inferred stellar-phase metallicities are, when compared at half-mass time, ∼0.25 dex higher than observed gas-phase metallicities of star-forming galaxies. While systematic uncertainties remain, this may imply that these quenched galaxies have continued low-level star formation, rather than abruptly terminating their star formation activity, and kept enhancing their metallicity until recently.</jats:p> Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment The Astrophysical Journal |
| spellingShingle | Morishita, T., Abramson, L. E., Treu, T., Brammer, G. B., Jones, T., Kelly, P., Stiavelli, M., Trenti, M., Vulcani, B., Wang, X., The Astrophysical Journal, Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment, Space and Planetary Science, Astronomy and Astrophysics |
| title | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_full | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_fullStr | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_full_unstemmed | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_short | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| title_sort | massive dead galaxies at z ∼ 2 with hst grism spectroscopy. i. star formation histories and metallicity enrichment |
| title_unstemmed | Massive Dead Galaxies at z ∼ 2 with HST Grism Spectroscopy. I. Star Formation Histories and Metallicity Enrichment |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.3847/1538-4357/ab1d53 |