High-z Sudoku: A diagnostic tool for identifying robust (sub)mm redshifts

Abstract

We present methods to (i) graphically identify robust redshifts using emission lines in the (sub)mm regime, (ii) evaluate the capabilities of different (sub)mm practices for measuring spectroscopic redshifts, and (iii) optimise future (sub)mm observations towards increasing the fraction of robust redshifts. Using this publicly-available code (https://github.com/tjlcbakx/redshift-search-graphs), we discuss scenarios where robust redshifts can be identified using both single- and multiple-line detections, as well as scenarios where the redshift remains ambiguous, even after the detection of multiple lines. Using the redshift distribution of (sub)mm samples, we quantify the efficiencies of various practices for measuring spectroscopic redshifts, including interferometers, as well as existing and future instruments specifically designed for redshift searches. Finally, we provide a method to optimise the observation strategy for future (sub)mm spectroscopic redshift searches with the Atacama Large Millimetre/submillimetre Array, where 2 mm proves indispensable for robust redshifts in the z = 2 - 4 region.

arXiv comment9 pages, 8 figures, resubmitted and implemented the comments of the referee

References in corpus (40)

• The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set
• Unveiling Dust-enshrouded Star Formation in the Early Universe: a Sub-mm Survey of the Hubble Deep Field
• A Deep Sub-millimeter Survey of Lensing Clusters: A New Window on Galaxy Formation and Evolution
• A Redshift Survey of the Submillimeter Galaxy Population
• Cool Gas in High Redshift Galaxies
• Submillimeter Galaxies
• Dusty Star-Forming Galaxies at High Redshift
• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• The LABOCA Survey of the Extended Chandra Deep Field South
• ALMA redshifts of millimeter-selected galaxies from the SPT survey: The redshift distribution of dusty star-forming galaxies
• Galaxy growth in a massive halo in the first billion years of cosmic history
• Evolution of Galaxy Stellar Mass Functions, Mass Densities, and Mass to Light Ratios from z 7 to z 4
• Submillimetre and far-infrared spectral energy distributions of galaxies: the luminosity-temperature relation and consequences for photometric redshifts
• The Formation of Submillimetre-Bright Galaxies from Gas Infall over a Billion Years
• A Redshift Survey of Herschel Far-Infrared Selected Starbursts and Implications for Obscured Star Formation
• The redshift distribution of dusty star forming galaxies from the SPT survey
• Blind detections of CO J = 1--0 in 11 H-ATLAS galaxies at z = 2.1--3.5 with the GBT/Zpectrometer
• The star-formation rate density from z = 0-6
• The Brightest Galaxies in the Dark Ages: Galaxies' Dust Continuum Emission During the Reionization Era
• The Complete Redshift Distribution of Dusty Star-forming Galaxies from the SPT-SZ Survey
• A Survey of Atomic Carbon [C I] in High-redshift Main-Sequence Galaxies
• The space density of luminous dusty star-forming galaxies at $z>4$: SCUBA-2 and LABOCA imaging of ultrared galaxies from $Herschel$-ATLAS
• A dusty star-forming galaxy at z=6 revealed by strong gravitational lensing
• Galaxy evolution in the infra-red: comparison of a hierarchical galaxy formation model with SPITZER data
• Turbulent Gas in Lensed Planck-selected Starbursts at redshifts 1-3.5
• CO J=1-0 spectroscopy of four submillimeter galaxies with the Zpectrometer on the Green Bank Telescope
• Measurements of CO redshifts with Z-Spec for lensed submillimeter galaxies discovered in the H-ATLAS survey
• GBT Zpectrometer CO(1-0) Observations of the Strongly-Lensed Submillimeter Galaxies from the Herschel ATLAS
• H-ATLAS: estimating redshifts of Herschel sources from sub-mm fluxes
• The Herschel Bright Sources (HerBS): Sample definition and SCUBA-2 observations
• The Origins Space Telescope
• NOEMA redshift measurements of bright Herschel galaxies
• First light demonstration of the integrated superconducting spectrometer
• ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34
• Early Science with the Large Millimeter Telescope: Observations of dust continuum and CO emission lines of cluster-lensed submillimetre galaxies at z=2.0-4.7
• Towards a census of high-redshift dusty galaxies with $Herschel$: A selection of "500 $\mu$m-risers"
• A search for the lenses in the Herschel Bright Sources (HerBS) Sample
• Red, redder, reddest: SCUBA-2 imaging of colour-selected \textit{Herschel} sources
• IRAM 30m-EMIR Redshift Search of z = 3-4 Lensed Dusty Starbursts selected from the HerBS sample
• Far-Infrared Photometric Redshifts: A New Approach to a Highly Uncertain Enterprise

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• Bright Extragalactic ALMA Redshift Survey (BEARS) III: Detailed study of emission lines from 71 Herschel targets
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• The LMT 2 millimeter receiver system (B4R). II. Science demonstration observations toward Orion-KL/OMC-1
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