THE REDSHIFT AND NATURE OF AzTEC/COSMOS 1: A STARBURST GALAXY AT z = 4.6∗

dc.creatorItziar Aretxaga
dc.creatorDavid Hughes
dc.date2011-04-20
dc.date.accessioned2023-07-25T16:24:30Z
dc.date.available2023-07-25T16:24:30Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1880
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7807071
dc.descriptionBased on broadband/narrowband photometry andKeckDEIMOSspectroscopy, we report a redshift of z = 4.64⁺⁰˙⁰⁶₋₀․₀₈ for AzTEC/COSMOS 1, the brightest submillimeter galaxy (SMG) in the AzTEC/COSMOS field. In addition to the COSMOS-survey X-ray to radio data, we report observations of the source with Herschel/PACS (100, 160 μm), CSO/SHARC II (350μm), and CARMA and PdBI (3 mm). We do not detect CO(5 → 4) line emission in the covered redshift ranges, 4.56–4.76 (PdBI/CARMA) and 4.94–5.02 (CARMA). If the line is within this bandwidth, this sets 3σ upper limits on the gas mass to ≲8 × 10⁹M⊙ and ≲5 × 10¹°M⊙, respectively (assuming similar conditions as observed in z ∼ 2 SMGs). This could be explained by a low CO-excitation in the source. Our analysis of the UV–IR spectral energy distribution of AzTEC 1 shows that it is an extremely young (_50 Myr), massive (M∗ ∼ 10¹¹ M⊙), but compact (≲2 kpc) galaxy, forming stars at a rate of ∼1300M⊙ yr⁻¹. Our results imply that AzTEC 1 is forming stars in a “gravitationally bound” regime in which gravity prohibits the formation of a superwind, leading to matter accumulation within the galaxy and further generations of star formation.
dc.formatapplication/pdf
dc.languageeng
dc.publisherThe Astrophysical Journal Letters
dc.relationcitation:Smolcic, V., et al., (2011), THE REDSHIFT AND NATURE OF AzTEC/COSMOS 1: A STARBURST GALAXY AT z = 4.6∗, The Astrophysical Journal Letters, Vol.731(L27):1-6
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/Galaxies: distances and redshifts
dc.subjectinfo:eu-repo/classification/Inspec/Galaxies: high-redshift
dc.subjectinfo:eu-repo/classification/Inspec/Galaxies: starburst
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleTHE REDSHIFT AND NATURE OF AzTEC/COSMOS 1: A STARBURST GALAXY AT z = 4.6∗
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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