Significant Dust-obscured Star Formation in Luminous Lyman-break Galaxies at z ∼7-8
| cam.issuedOnline | 2022-03-24 | |
| dc.contributor.author | Schouws, S | |
| dc.contributor.author | Stefanon, M | |
| dc.contributor.author | Bouwens, R | |
| dc.contributor.author | Smit, R | |
| dc.contributor.author | Hodge, J | |
| dc.contributor.author | Labbé, I | |
| dc.contributor.author | Algera, H | |
| dc.contributor.author | Boogaard, L | |
| dc.contributor.author | Carniani, S | |
| dc.contributor.author | Fudamoto, Y | |
| dc.contributor.author | Holwerda, BW | |
| dc.contributor.author | Illingworth, GD | |
| dc.contributor.author | Maiolino, R | |
| dc.contributor.author | Maseda, M | |
| dc.contributor.author | Oesch, P | |
| dc.contributor.author | Van Der Werf, P | |
| dc.contributor.orcid | Schouws, S [0000-0001-9746-0924] | |
| dc.contributor.orcid | Stefanon, M [0000-0001-7768-5309] | |
| dc.contributor.orcid | Bouwens, R [0000-0002-4989-2471] | |
| dc.contributor.orcid | Smit, R [0000-0001-8034-7802] | |
| dc.contributor.orcid | Hodge, J [0000-0001-6586-8845] | |
| dc.contributor.orcid | Labbé, I [0000-0002-2057-5376] | |
| dc.contributor.orcid | Algera, H [0000-0002-4205-9567] | |
| dc.contributor.orcid | Boogaard, L [0000-0002-3952-8588] | |
| dc.contributor.orcid | Carniani, S [0000-0002-6719-380X] | |
| dc.contributor.orcid | Fudamoto, Y [0000-0001-7440-8832] | |
| dc.contributor.orcid | Holwerda, BW [0000-0002-4884-6756] | |
| dc.contributor.orcid | Illingworth, GD [0000-0002-8096-2837] | |
| dc.contributor.orcid | Maiolino, R [0000-0002-4985-3819] | |
| dc.contributor.orcid | Maseda, M [0000-0003-0695-4414] | |
| dc.contributor.orcid | Oesch, P [0000-0001-5851-6649] | |
| dc.contributor.orcid | Van Der Werf, P [0000-0001-5434-5942] | |
| dc.date.accessioned | 2022-03-28T19:05:42Z | |
| dc.date.available | 2022-03-28T19:05:42Z | |
| dc.date.issued | 2022 | |
| dc.date.submitted | 2021-05-24 | |
| dc.date.updated | 2022-03-28T19:05:41Z | |
| dc.description.abstract | We make use of ALMA continuum observations of $15$ luminous Lyman-break galaxies at $z$$\sim$$7$$-$$8$ to probe their dust-obscured star-formation. These observations are sensitive enough to probe to obscured SFRs of $20$ $M_{\odot}$$/$$yr$ ($3\sigma$). Six of the targeted galaxies show significant ($\geq$$3$$\sigma$) dust continuum detections, more than doubling the number of known dust-detected galaxies at $z$$>$$6.5$. Their IR luminosities range from $2.7$$\times$$10^{11}$ $L_{\odot}$ to $1.1$$\times$$10^{12}$ $L_{\odot}$, equivalent to obscured SFRs of $20$ to $105$ $M_{\odot}$$/$$yr$. We use our results to quantify the correlation of the infrared excess IRX on the UV-continuum slope $\beta_{UV}$ and stellar mass. Our results are most consistent with an SMC attenuation curve for intrinsic $UV$-slopes $\beta_{UV,intr}$ of $-2.63$ and most consistent with an attenuation curve in-between SMC and Calzetti for $\beta_{UV,intr}$ slopes of $-2.23$, assuming a dust temperature $T_d$ of $50$ K. Our fiducial IRX-stellar mass results at $z$$\sim$$7$$-$$8$ are consistent with marginal evolution from $z$$\sim$$0$. We then show how both results depend on $T_d$. For our six dust-detected sources, we estimate their dust masses and find that they are consistent with dust production from SNe if the dust destruction is low ($<$$90$%). Finally we determine the contribution of dust-obscured star formation to the star formation rate density for $UV$ luminous ($<$$-$$21.5$ mag: $\gtrsim$$1.7$$L_{UV} ^*$) $z$$\sim$$7$$-$$8$ galaxies, finding that the total SFR density at $z$$\sim$$7$ and $z$$\sim$$8$ from bright galaxies is $0.18_{-0.10}^{+0.08}$ dex and $0.20_{-0.09}^{+0.05}$ dex higher, respectively, i.e. $\sim$$\frac{1}{3}$ of the star formation in $\gtrsim$$1.7$$L_{UV} ^*$ galaxies at $z$$\sim$$7$$-$$8$ is obscured by dust. | |
| dc.description.sponsorship | ERC STFC | |
| dc.identifier.doi | 10.17863/CAM.82825 | |
| dc.identifier.eissn | 1538-4357 | |
| dc.identifier.issn | 0004-637X | |
| dc.identifier.other | apjac4605 | |
| dc.identifier.other | ac4605 | |
| dc.identifier.other | aas32389 | |
| dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/335396 | |
| dc.language | en | |
| dc.language.iso | eng | |
| dc.publisher | American Astronomical Society | |
| dc.publisher.url | http://dx.doi.org/10.3847/1538-4357/ac4605 | |
| dc.subject | astro-ph.GA | |
| dc.subject | astro-ph.GA | |
| dc.title | Significant Dust-obscured Star Formation in Luminous Lyman-break Galaxies at z ∼7-8 | |
| dc.type | Article | |
| dcterms.dateAccepted | 2021-12-11 | |
| prism.issueIdentifier | 1 | |
| prism.publicationName | Astrophysical Journal | |
| prism.volume | 928 | |
| pubs.funder-project-id | Science and Technology Facilities Council (ST/M001172/1) | |
| pubs.funder-project-id | European Research Council (695671) | |
| pubs.funder-project-id | STFC (ST/V000918/1) | |
| rioxxterms.licenseref.uri | http://creativecommons.org/licenses/by/4.0/ | |
| rioxxterms.version | VoR | |
| rioxxterms.versionofrecord | 10.3847/1538-4357/ac4605 |
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