The Hawk-I UDS and GOODS survey (HUGS): Survey design and deep K-band number counts

A. Fontana, J. S. Dunlop, D. Paris, T. A. Targett, K. Boutsia, M. Castellano, A. Galametz, A. Grazian, R. McLure, E. Merlin, L. Pentericci, S. Wuyts, O. Almaini, K. Caputi, R. R. Chary, M. Cirasuolo, C. J. Conselice, A. Cooray, E. Daddi, M. DickinsonS. M. Faber, G. Fazio, H. C. Ferguson, E. Giallongo, M. Giavalisco, N. A. Grogin, N. Hathi, A. M. Koekemoer, D. C. Koo, R. A. Lucas, M. Nonino, H. W. Rix, A. Renzini, D. Rosario, P. Santini, C. Scarlata, V. Sommariva, Daniel P Stark, A. Van Der Wel, E. Vanzella, V. Wild, H. Yan, S. Zibetti

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We present the results of a new, ultra-deep, near-infrared imaging survey executed with the Hawk-I imager at the ESO VLT, of which we make all the data (images and catalog) public. This survey, named HUGS (Hawk-I UDS and GOODS Survey), provides deep, high-quality imaging in the K and Y bands over the portions of the UKIDSS UDS and GOODS-South fields covered by the CANDELS HST WFC3/IR survey. In this paper we describe the survey strategy, the observational campaign, the data reduction process, and the data quality. We show that, thanks to exquisite image quality and extremely long exposure times, HUGS delivers the deepest K-band images ever collected over areas of cosmological interest, and in general ideally complements the CANDELS data set in terms of image quality and depth. In the GOODS-S field, the K-band observations cover the whole CANDELS area with a complex geometry made of 6 different, partly overlapping pointings, in order to best match the deep and wide areas of CANDELS imaging. In the deepest region (which includes most of the Hubble Ultra Deep Field) exposure times exceed 80 hours of integration, yielding a 1-σ magnitude limit per square arcsec of 28.0 AB mag. The seeing is exceptional and homogeneous across the various pointings, confined to the range 0.38-0.43 arcsec. In the UDS field the survey is about one magnitude shallower (to match the correspondingly shallower depth of the CANDELS images) but includes also Y-band band imaging (which, in the UDS, was not provided by the CANDELS WFC3/IR imaging). In the K-band, with an average exposure time of 13 hours, and seeing in the range 0.37-0.43 arcsec, the 1-σ limit per square arcsec in the UDS imaging is 27.3 AB mag. In the Y-band, with an average exposure time 8 h, and seeing in the range 0.45-0.5 arcsec, the imaging yields a 1-σ limit per square arcsec of 28.3 AB mag. We show that the HUGS observations are well matched to the depth of the CANDELS WFC3/IR data, since the majority of even the faintest galaxies detected in the CANDELS H-band images are also detected in HUGS. Finally we present the K-band galaxy number counts produced by combining the HUGS data from the two fields. We show that the slope of the number counts depends sensitively on the assumed distribution of galaxy sizes, with potential impact on the estimated extra-galactic background light.

Original languageEnglish (US)
Article numberA6
JournalAstronomy and Astrophysics
Volume570
DOIs
StatePublished - Oct 1 2014

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survey design
extremely high frequencies
galaxies
goods
data reduction
European Southern Observatory
data quality
complement
catalogs
near infrared
slopes
geometry

Keywords

  • Galaxies: evolution
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fontana, A., Dunlop, J. S., Paris, D., Targett, T. A., Boutsia, K., Castellano, M., ... Zibetti, S. (2014). The Hawk-I UDS and GOODS survey (HUGS): Survey design and deep K-band number counts. Astronomy and Astrophysics, 570, [A6]. https://doi.org/10.1051/0004-6361/201423543

The Hawk-I UDS and GOODS survey (HUGS) : Survey design and deep K-band number counts. / Fontana, A.; Dunlop, J. S.; Paris, D.; Targett, T. A.; Boutsia, K.; Castellano, M.; Galametz, A.; Grazian, A.; McLure, R.; Merlin, E.; Pentericci, L.; Wuyts, S.; Almaini, O.; Caputi, K.; Chary, R. R.; Cirasuolo, M.; Conselice, C. J.; Cooray, A.; Daddi, E.; Dickinson, M.; Faber, S. M.; Fazio, G.; Ferguson, H. C.; Giallongo, E.; Giavalisco, M.; Grogin, N. A.; Hathi, N.; Koekemoer, A. M.; Koo, D. C.; Lucas, R. A.; Nonino, M.; Rix, H. W.; Renzini, A.; Rosario, D.; Santini, P.; Scarlata, C.; Sommariva, V.; Stark, Daniel P; Van Der Wel, A.; Vanzella, E.; Wild, V.; Yan, H.; Zibetti, S.

In: Astronomy and Astrophysics, Vol. 570, A6, 01.10.2014.

Research output: Contribution to journalArticle

Fontana, A, Dunlop, JS, Paris, D, Targett, TA, Boutsia, K, Castellano, M, Galametz, A, Grazian, A, McLure, R, Merlin, E, Pentericci, L, Wuyts, S, Almaini, O, Caputi, K, Chary, RR, Cirasuolo, M, Conselice, CJ, Cooray, A, Daddi, E, Dickinson, M, Faber, SM, Fazio, G, Ferguson, HC, Giallongo, E, Giavalisco, M, Grogin, NA, Hathi, N, Koekemoer, AM, Koo, DC, Lucas, RA, Nonino, M, Rix, HW, Renzini, A, Rosario, D, Santini, P, Scarlata, C, Sommariva, V, Stark, DP, Van Der Wel, A, Vanzella, E, Wild, V, Yan, H & Zibetti, S 2014, 'The Hawk-I UDS and GOODS survey (HUGS): Survey design and deep K-band number counts', Astronomy and Astrophysics, vol. 570, A6. https://doi.org/10.1051/0004-6361/201423543
Fontana, A. ; Dunlop, J. S. ; Paris, D. ; Targett, T. A. ; Boutsia, K. ; Castellano, M. ; Galametz, A. ; Grazian, A. ; McLure, R. ; Merlin, E. ; Pentericci, L. ; Wuyts, S. ; Almaini, O. ; Caputi, K. ; Chary, R. R. ; Cirasuolo, M. ; Conselice, C. J. ; Cooray, A. ; Daddi, E. ; Dickinson, M. ; Faber, S. M. ; Fazio, G. ; Ferguson, H. C. ; Giallongo, E. ; Giavalisco, M. ; Grogin, N. A. ; Hathi, N. ; Koekemoer, A. M. ; Koo, D. C. ; Lucas, R. A. ; Nonino, M. ; Rix, H. W. ; Renzini, A. ; Rosario, D. ; Santini, P. ; Scarlata, C. ; Sommariva, V. ; Stark, Daniel P ; Van Der Wel, A. ; Vanzella, E. ; Wild, V. ; Yan, H. ; Zibetti, S. / The Hawk-I UDS and GOODS survey (HUGS) : Survey design and deep K-band number counts. In: Astronomy and Astrophysics. 2014 ; Vol. 570.
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TY - JOUR

T1 - The Hawk-I UDS and GOODS survey (HUGS)

T2 - Survey design and deep K-band number counts

AU - Fontana, A.

AU - Dunlop, J. S.

AU - Paris, D.

AU - Targett, T. A.

AU - Boutsia, K.

AU - Castellano, M.

AU - Galametz, A.

AU - Grazian, A.

AU - McLure, R.

AU - Merlin, E.

AU - Pentericci, L.

AU - Wuyts, S.

AU - Almaini, O.

AU - Caputi, K.

AU - Chary, R. R.

AU - Cirasuolo, M.

AU - Conselice, C. J.

AU - Cooray, A.

AU - Daddi, E.

AU - Dickinson, M.

AU - Faber, S. M.

AU - Fazio, G.

AU - Ferguson, H. C.

AU - Giallongo, E.

AU - Giavalisco, M.

AU - Grogin, N. A.

AU - Hathi, N.

AU - Koekemoer, A. M.

AU - Koo, D. C.

AU - Lucas, R. A.

AU - Nonino, M.

AU - Rix, H. W.

AU - Renzini, A.

AU - Rosario, D.

AU - Santini, P.

AU - Scarlata, C.

AU - Sommariva, V.

AU - Stark, Daniel P

AU - Van Der Wel, A.

AU - Vanzella, E.

AU - Wild, V.

AU - Yan, H.

AU - Zibetti, S.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - We present the results of a new, ultra-deep, near-infrared imaging survey executed with the Hawk-I imager at the ESO VLT, of which we make all the data (images and catalog) public. This survey, named HUGS (Hawk-I UDS and GOODS Survey), provides deep, high-quality imaging in the K and Y bands over the portions of the UKIDSS UDS and GOODS-South fields covered by the CANDELS HST WFC3/IR survey. In this paper we describe the survey strategy, the observational campaign, the data reduction process, and the data quality. We show that, thanks to exquisite image quality and extremely long exposure times, HUGS delivers the deepest K-band images ever collected over areas of cosmological interest, and in general ideally complements the CANDELS data set in terms of image quality and depth. In the GOODS-S field, the K-band observations cover the whole CANDELS area with a complex geometry made of 6 different, partly overlapping pointings, in order to best match the deep and wide areas of CANDELS imaging. In the deepest region (which includes most of the Hubble Ultra Deep Field) exposure times exceed 80 hours of integration, yielding a 1-σ magnitude limit per square arcsec of 28.0 AB mag. The seeing is exceptional and homogeneous across the various pointings, confined to the range 0.38-0.43 arcsec. In the UDS field the survey is about one magnitude shallower (to match the correspondingly shallower depth of the CANDELS images) but includes also Y-band band imaging (which, in the UDS, was not provided by the CANDELS WFC3/IR imaging). In the K-band, with an average exposure time of 13 hours, and seeing in the range 0.37-0.43 arcsec, the 1-σ limit per square arcsec in the UDS imaging is 27.3 AB mag. In the Y-band, with an average exposure time 8 h, and seeing in the range 0.45-0.5 arcsec, the imaging yields a 1-σ limit per square arcsec of 28.3 AB mag. We show that the HUGS observations are well matched to the depth of the CANDELS WFC3/IR data, since the majority of even the faintest galaxies detected in the CANDELS H-band images are also detected in HUGS. Finally we present the K-band galaxy number counts produced by combining the HUGS data from the two fields. We show that the slope of the number counts depends sensitively on the assumed distribution of galaxy sizes, with potential impact on the estimated extra-galactic background light.

AB - We present the results of a new, ultra-deep, near-infrared imaging survey executed with the Hawk-I imager at the ESO VLT, of which we make all the data (images and catalog) public. This survey, named HUGS (Hawk-I UDS and GOODS Survey), provides deep, high-quality imaging in the K and Y bands over the portions of the UKIDSS UDS and GOODS-South fields covered by the CANDELS HST WFC3/IR survey. In this paper we describe the survey strategy, the observational campaign, the data reduction process, and the data quality. We show that, thanks to exquisite image quality and extremely long exposure times, HUGS delivers the deepest K-band images ever collected over areas of cosmological interest, and in general ideally complements the CANDELS data set in terms of image quality and depth. In the GOODS-S field, the K-band observations cover the whole CANDELS area with a complex geometry made of 6 different, partly overlapping pointings, in order to best match the deep and wide areas of CANDELS imaging. In the deepest region (which includes most of the Hubble Ultra Deep Field) exposure times exceed 80 hours of integration, yielding a 1-σ magnitude limit per square arcsec of 28.0 AB mag. The seeing is exceptional and homogeneous across the various pointings, confined to the range 0.38-0.43 arcsec. In the UDS field the survey is about one magnitude shallower (to match the correspondingly shallower depth of the CANDELS images) but includes also Y-band band imaging (which, in the UDS, was not provided by the CANDELS WFC3/IR imaging). In the K-band, with an average exposure time of 13 hours, and seeing in the range 0.37-0.43 arcsec, the 1-σ limit per square arcsec in the UDS imaging is 27.3 AB mag. In the Y-band, with an average exposure time 8 h, and seeing in the range 0.45-0.5 arcsec, the imaging yields a 1-σ limit per square arcsec of 28.3 AB mag. We show that the HUGS observations are well matched to the depth of the CANDELS WFC3/IR data, since the majority of even the faintest galaxies detected in the CANDELS H-band images are also detected in HUGS. Finally we present the K-band galaxy number counts produced by combining the HUGS data from the two fields. We show that the slope of the number counts depends sensitively on the assumed distribution of galaxy sizes, with potential impact on the estimated extra-galactic background light.

KW - Galaxies: evolution

KW - Surveys

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