Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years
We present millimetre dust emission measurements of two Lyman-break galaxies at z ∼ 3 and construct for the first time fully sampled infrared spectral energy distributions (SEDs), from mid-IR to the Rayleigh-Jeans tail, of individually detected, unlensed, UV-selected, main sequence (MS) galaxies at...
| Hoofdauteurs: | , , , , , , , , , , , , |
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| Formaat: | Journal article |
| Taal: | English |
| Gepubliceerd in: |
EDP Sciences
2017
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| _version_ | 1826293210923663360 |
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| author | Magdis, G Rigopoulou, D Daddi, E Bethermin, M Feruglio, C Sargent, M Dannerbauer, H Dickinson, M Elbaz, D Gomez Guijarro, C Huang, J Toft, S Valentino, F |
| author_facet | Magdis, G Rigopoulou, D Daddi, E Bethermin, M Feruglio, C Sargent, M Dannerbauer, H Dickinson, M Elbaz, D Gomez Guijarro, C Huang, J Toft, S Valentino, F |
| author_sort | Magdis, G |
| collection | OXFORD |
| description | We present millimetre dust emission measurements of two Lyman-break galaxies at z ∼ 3 and construct for the first time fully sampled infrared spectral energy distributions (SEDs), from mid-IR to the Rayleigh-Jeans tail, of individually detected, unlensed, UV-selected, main sequence (MS) galaxies at z = 3. The SED modelling of the two sources confirms previous findings, based on stacked ensembles, of an increasing mean radiation field (U) with redshift, consistent with a rapidly decreasing gas metallicity in z > 2 galaxies. Complementing our study with CO[J = 3 → 2] emission line observations, we have measured the molecular gas mass reservoir (M H 2 ) of the systems using three independent approaches: 1) CO line observations; 2) the dust to gas mass ratio vs. metallicity relation; and 3) a single band, dust emission flux on the Rayleigh-Jeans side of the SED. All techniques return consistent M H 2 estimates within a factor of two or less, yielding gas depletion time-scales (τ dep ≈ 0.35 Gyr) and gas-to-stellar mass ratios (M H 2 /M ∗ ≈ 0.5-1) for our z ∼ 3 massive MS galaxies. The overall properties of our galaxies are consistent with trends and relations established at lower redshifts, extending the apparent uniformity of star-forming galaxies over the last 11.5 billion years. |
| first_indexed | 2024-03-07T03:26:36Z |
| format | Journal article |
| id | oxford-uuid:b9407714-645d-42ad-a1d8-e76e45e9f04c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:26:36Z |
| publishDate | 2017 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:b9407714-645d-42ad-a1d8-e76e45e9f04c2022-03-27T05:01:45ZDust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion yearsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b9407714-645d-42ad-a1d8-e76e45e9f04cEnglishSymplectic Elements at OxfordEDP Sciences2017Magdis, GRigopoulou, DDaddi, EBethermin, MFeruglio, CSargent, MDannerbauer, HDickinson, MElbaz, DGomez Guijarro, CHuang, JToft, SValentino, FWe present millimetre dust emission measurements of two Lyman-break galaxies at z ∼ 3 and construct for the first time fully sampled infrared spectral energy distributions (SEDs), from mid-IR to the Rayleigh-Jeans tail, of individually detected, unlensed, UV-selected, main sequence (MS) galaxies at z = 3. The SED modelling of the two sources confirms previous findings, based on stacked ensembles, of an increasing mean radiation field (U) with redshift, consistent with a rapidly decreasing gas metallicity in z > 2 galaxies. Complementing our study with CO[J = 3 → 2] emission line observations, we have measured the molecular gas mass reservoir (M H 2 ) of the systems using three independent approaches: 1) CO line observations; 2) the dust to gas mass ratio vs. metallicity relation; and 3) a single band, dust emission flux on the Rayleigh-Jeans side of the SED. All techniques return consistent M H 2 estimates within a factor of two or less, yielding gas depletion time-scales (τ dep ≈ 0.35 Gyr) and gas-to-stellar mass ratios (M H 2 /M ∗ ≈ 0.5-1) for our z ∼ 3 massive MS galaxies. The overall properties of our galaxies are consistent with trends and relations established at lower redshifts, extending the apparent uniformity of star-forming galaxies over the last 11.5 billion years. |
| spellingShingle | Magdis, G Rigopoulou, D Daddi, E Bethermin, M Feruglio, C Sargent, M Dannerbauer, H Dickinson, M Elbaz, D Gomez Guijarro, C Huang, J Toft, S Valentino, F Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title | Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title_full | Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title_fullStr | Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title_full_unstemmed | Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title_short | Dust and gas in star-forming galaxies at z ~ 3: Extending galaxy uniformity to 11.5 billion years |
| title_sort | dust and gas in star forming galaxies at z 3 extending galaxy uniformity to 11 5 billion years |
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