NIKA2 Cosmological Legacy Survey: Survey Description and Galaxy Number Counts

Abstract

Aims. Deep millimeter surveys are necessary to probe the dust-obscured galaxies at high redshift. We conducted a large observing program at 1.2 and 2 mm with the NIKA2 camera installed on the IRAM 30-meter telescope. This NIKA2 Cosmological Legacy Survey (N2CLS) covers two emblematic fields: GOODS-N and COSMOS. We introduce the N2CLS survey and present new 1.2 and 2 mm number count measurements based on the tiered N2CLS observations from October 2017 to May 2021. Methods. We develop an end-to-end simulation that combines an input sky model with the instrument noise and data reduction pipeline artifacts. This simulation is used to compute the sample purity, flux boosting, pipeline transfer function, completeness, and effective area of the survey. We used the 117 deg${}^2$ SIDES simulations as the sky model, which include the galaxy clustering. Our formalism allows us to correct the source number counts to obtain galaxy number counts, the difference between the two being due to resolution effects caused by the blending of several galaxies inside the large beam of single-dish instruments. Results. The N2CLS-May2021 survey reaches an average 1-$\sigma$ noise level of 0.17 and 0.048 mJy on GOODS-N over 159 arcmin${}^2$, and 0.46 and 0.14 mJy on COSMOS over 1010 arcmin${}^2$, at 1.2 and 2 mm, respectively. For a purity threshold of 80%, we detect 120 and 67 sources in GOODS-N and 195 and 76 sources in COSMOS, at 1.2 and 2 mm, respectively. Our measurement connects the bright single-dish to the deep interferometric number counts. After correcting for resolution effects, our results reconcile the single-dish and interferometric number counts and are further accurately compared with model predictions.

Accepted by A&A. 23 pages, 12 figures

References in corpus (38)

• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Cosmic Star Formation History
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies
• Evolution of the dust emission of massive galaxies up to z=4 and constraints on their dominant mode of star formation
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts
• Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0<z<4
• Reionization Era Bright Emission Line Survey: Selection and Characterization of Luminous Interstellar Medium Reservoirs in the z>6.5 Universe
• Submillimetre galaxies in a hierarchical universe: number counts, redshift distribution, and implications for the IMF
• The Evolution of the IR Luminosity Function and Dust-obscured Star Formation in the Last 13 Billion Years
• ALMA spectroscopic survey in the Hubble Ultra Deep Field: Continuum number counts, resolved 1.2-mm extragalactic background, and properties of the faintest dusty star forming galaxies
• The NIKA2 large field-of-view millimeter continuum camera for the 30-m IRAM telescope
• Kiloparsec-scale ALMA Imaging of [CII] and Dust Continuum Emission of 27 Quasar Host Galaxies at z~6
• ISM properties of a Massive Dusty Star-Forming Galaxy discovered at z ~ 7
• Normal, Dust-Obscured Galaxies in the Epoch of Reionization
• High-redshift major mergers weakly enhance star formation
• An AzTEC 1.1 mm Survey of the GOODS-N Field I: Maps, Catalogue, and Source Statistics
• The East Asian Observatory SCUBA--2 survey of the COSMOS field: unveiling 1147 bright sub-millimeter sources across 2.6 square degrees
• ALMA Characterises the Dust Temperature of z ~ 5.5 Star-Forming Galaxies
• ALMA Deep Field in SSA22: Source Catalog and Number Counts
• The properties of the interstellar medium of galaxies across time as traced by the neutral atomic carbon [CI]
• Simulated observations of sub-millimetre galaxies: the impact of single-dish resolution and field variance
• GOODS-ALMA 2.0: Source catalog, number counts, and prevailing compact sizes in 1.1 mm galaxies
• An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
• The nature of sub-millimeter and highly star-forming galaxies in the EAGLE simulation
• Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA
• The influence of wavelength, flux, and lensing selection effects on the redshift distribution of dusty, star-forming galaxies
• A Deep 1.2 mm Map of the Lockman Hole North Field
• CONCERTO: High-fidelity simulation of millimeter line emissions of galaxies and [CII] intensity mapping
• A new look at the infrared properties of z $\sim$ 5 galaxies
• GOODS-ALMA 2.0: Starbursts in the main sequence reveal compact star formation regulating galaxy evolution prequenching
• The IRAM/GISMO two-millimeter survey in the COSMOS field
• The redshift distribution of submillimetre galaxies at different wavelengths
• Probing the existence of a rich galaxy overdensity at z=5.2
• Galaxy stellar mass assembly: the difficulty matching observations and semi-analytical predictions
• ALMACAL IX: multi-band ALMA survey for dusty star-forming galaxies and the resolved fractions of the cosmic infrared background
• Multi-probe analysis of the galaxy cluster CL J1226.9+3332: Hydrostatic mass and hydrostatic-to-lensing bias

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• Overdense fireworks in GOODS-N: Unveiling a record number of massive dusty star forming galaxies at z$\sim$5.2 with the N2CLS
• A mock redshift catalogue of the dusty star-forming galaxy population with intrinsic clustering and lensing for deep millimetre surveys
• The case for an all-sky millimetre survey at sub-arcminute resolution
• The Atacama Cosmology Telescope: Extragalactic Point Sources in the Southern Surveys at 150, 220 and 280 GHz observed between 2008-2010
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