2026A&A...705A.213P

Query : 2026A&A...705A.213P

2026A&A...705A.213P - Astronomy and Astrophysics, volume 705A213 (2026/1-1)

NIKA2 Cosmological Legacy Survey. First measurement of the confusion noise at the IRAM 30 m telescope.

PONTHIEU N., DESERT F.-X., BEELEN A., ADAM R., ADE P., AJEDDIG H., AMARANTIDIS S., ANDRE P., AUSSEL H., BENOIT A., BERTA S., BETHERMIN M., BING L.J., BONGIOVANNI A., BOUNMY J., BOURRION O., CALVO M., CATALANO A., CHEROUVRIER D., DE PETRIS M., DOYLE S., DRIESSEN E.F.C., EJLALI G., FERRAGAMO A., GOMEZ A., GOUPY J., HANSER C., KATSIOLI S., KERUZORE F., KRAMER C., LADJELATE B., LAGACHE G., LECLERCQ S., LESTRADE J.-F., MACIAS-PEREZ J.F., MADDEN S.C., MAURY A., MAYET F., MONFARDINI A., MOYER-ANIN A., MUNOZ-ECHEVERRIA M., MYSERLIS I., NERI R., PALIWAL A., PEROTTO L., PISANO G., REVERET V., RIGBY A.J., RITACCO A., ROUSSEL H., RUPPIN F., SANCHEZ-PORTAL M., SAVORGNANO S., SCHUSTER K., SIEVERS A., TUCKER C. and ZYLKA R.

Abstract (from CDS):

The NIKA2 Cosmological Legacy Survey (N2CLS) is a large programme using the NIKA2 dual-band camera on the IRAM 30 m telescope. Its goal is to improve our understanding of the physics of distant Dusty Star Forming Galaxies (DSFGs) by carrying out deep surveys of two fields, GOODS-North and COSMOS. This work is focussed on GOODS-North, which was observed for 78.2 hours, simultaneously at 1.2 and 2 mm, with a field of view of ∼240 arcmin². With such a deep integration, we were able to measure, for the first time, the confusion noise limits at the 30 m telescope using the best sampled ∼62 arcmin² and masking sources with a flux greater than 0.54 or 0.17 mJy at 1.2 or 2 mm, respectively. We found a confusion noise of $ 139.1^{+ 15.9}_{- 19.2}\pm11.9 $ μJy/beam at 1.2 mm and $ 38.6^{+ 9.6}_{- 13.1} \pm3.7 $ μJy/beam at 2 mm (the first uncertainty is statistical, the second is the cosmic variance). In this region, this corresponds to half the instrumental noise. To derive these estimates, we devised a novel estimator, referred to as the cross variance, which also enabled us to estimate the correlated confusion noise between the two bands. Thus, we obtained a result of $ 49.6^{+ 15.9}_{- 24.8}\pm 6.4 $ μJy/beam. These values are consistent with the state of the art Simulated Infrared Dusty Extragalactic Sky (SIDES) model.

Abstract Copyright: © The Authors 2026

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: high-redshift - infrared: diffuse background - infrared: galaxies

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NAME GOODS-N Field	reg	12 36 55.0	+62 14 15						~	1364	1

Query : 2026A&A...705A.213P

Basic data :

NAME GOODS-N Field -- Region defined in the Sky
Other object types:	`reg ()`
ICRS coord. (ep=J2000) :	`12 36 55.0 +62 14 15 [ ] D 2011ApJ...732..126M`
FK4 coord. (ep=B1950 eq=1950) :	`12 34 41.1 +62 30 45 [ ]`
Gal coord. (ep=J2000) :	`125.8654 +54.8080 [ ]`

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NAME GOODS-N Field NAME GOODS North Field NAME GOODS Northern Field NAME GOODS-North Field

References (1364 between 1850 and 2026) (Total 1364)
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