The spitzer space telescope first-look survey: KPNO mosaic-1 R-band images and source catalogs

Dario Fadda, Buell Tomasson Jannuzi, Alyson Ford, Lisa J. Siorrie-Lombardi

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We present R-band images covering more than 11 square degrees of sky that were obtained in preparation for the Spitzer Space Telescope First-Look Survey (FLS). The FLS was designed to characterize the mid-infrared sky at depths 2 orders of magnitude deeper than previous surveys. The extragalactic component is the first cosmological survey done with Spitzer. Source catalogs extracted from the R-band images are also presented. The R-band images were obtained using the Mosaic-1 camera on the 4 m Mayall Telescope of the Kitt Peak National Observatory. Two relatively large regions of the sky were observed to modest depth: the main FLS extragalactic field (17 h18 m00 s, +59°30′00″.0 [J2000]; l = 88°.3, b = +34°.9) and the ELAIS-N1 field (16 h10 m01 s, +54°30′36″.0; l = 84°.2, b = +44°.9). While both these fields were in early plans for the FLS, only a single deep-pointing test observation was made at the ELAIS-N1 location. The larger Legacy program SWIRE will include this region among its surveyed areas. The data products of our KPNO imaging (images and object catalogs) are made available to the community through the World Wide Web (via the Spitzer Science Center and NOAO Science Archive). The overall quality of the images is high. The measured positions of sources detected in the images have rms uncertainties in their absolute positions on the order of 0″.35 with possible systematic offsets on the order of 0″.1, depending on the reference frame of comparison. The relative astrometric accuracy is much better than 1/10 of an arcsecond. Typical delivered image quality in the images is 1″.1 full width at half-maximum. The images are relatively deep, since they reach a median 5 σ depth limiting magnitude of R = 25.5 (Vega) as measured within a 1.35 FWHM aperture, for which the signal-to-noise ratio (S/N) is maximal. Catalogs have been extracted with SExtractor, using thresholds in area and flux for which the number of false detections is below 1% at R = 25. Only sources with S/N > 3 have been retained in the final catalogs. Comparing the galaxy number counts from our images with those of deeper R-band surveys, we estimate that our observations are 50% complete at R = 24.5. These limits in depth are sufficient to identify a substantial fraction of the infrared sources that will be detected by Spitzer.

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalAstronomical Journal
Volume128
Issue number1 1783
DOIs
StatePublished - Jul 2004
Externally publishedYes

Fingerprint

Space Infrared Telescope Facility
catalogs
sky
mosaic
World Wide Web
data products
signal-to-noise ratio
field survey
observatories
coverings
signal to noise ratios
observatory
apertures
cameras
telescopes
galaxies
preparation

Keywords

  • Catalogs
  • Galaxies: photometry

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The spitzer space telescope first-look survey : KPNO mosaic-1 R-band images and source catalogs. / Fadda, Dario; Jannuzi, Buell Tomasson; Ford, Alyson; Siorrie-Lombardi, Lisa J.

In: Astronomical Journal, Vol. 128, No. 1 1783, 07.2004, p. 1-15.

Research output: Contribution to journalArticle

Fadda, Dario ; Jannuzi, Buell Tomasson ; Ford, Alyson ; Siorrie-Lombardi, Lisa J. / The spitzer space telescope first-look survey : KPNO mosaic-1 R-band images and source catalogs. In: Astronomical Journal. 2004 ; Vol. 128, No. 1 1783. pp. 1-15.
@article{057e6b70c089422dba1b32a0d026e9af,
title = "The spitzer space telescope first-look survey: KPNO mosaic-1 R-band images and source catalogs",
abstract = "We present R-band images covering more than 11 square degrees of sky that were obtained in preparation for the Spitzer Space Telescope First-Look Survey (FLS). The FLS was designed to characterize the mid-infrared sky at depths 2 orders of magnitude deeper than previous surveys. The extragalactic component is the first cosmological survey done with Spitzer. Source catalogs extracted from the R-band images are also presented. The R-band images were obtained using the Mosaic-1 camera on the 4 m Mayall Telescope of the Kitt Peak National Observatory. Two relatively large regions of the sky were observed to modest depth: the main FLS extragalactic field (17 h18 m00 s, +59°30′00″.0 [J2000]; l = 88°.3, b = +34°.9) and the ELAIS-N1 field (16 h10 m01 s, +54°30′36″.0; l = 84°.2, b = +44°.9). While both these fields were in early plans for the FLS, only a single deep-pointing test observation was made at the ELAIS-N1 location. The larger Legacy program SWIRE will include this region among its surveyed areas. The data products of our KPNO imaging (images and object catalogs) are made available to the community through the World Wide Web (via the Spitzer Science Center and NOAO Science Archive). The overall quality of the images is high. The measured positions of sources detected in the images have rms uncertainties in their absolute positions on the order of 0″.35 with possible systematic offsets on the order of 0″.1, depending on the reference frame of comparison. The relative astrometric accuracy is much better than 1/10 of an arcsecond. Typical delivered image quality in the images is 1″.1 full width at half-maximum. The images are relatively deep, since they reach a median 5 σ depth limiting magnitude of R = 25.5 (Vega) as measured within a 1.35 FWHM aperture, for which the signal-to-noise ratio (S/N) is maximal. Catalogs have been extracted with SExtractor, using thresholds in area and flux for which the number of false detections is below 1{\%} at R = 25. Only sources with S/N > 3 have been retained in the final catalogs. Comparing the galaxy number counts from our images with those of deeper R-band surveys, we estimate that our observations are 50{\%} complete at R = 24.5. These limits in depth are sufficient to identify a substantial fraction of the infrared sources that will be detected by Spitzer.",
keywords = "Catalogs, Galaxies: photometry",
author = "Dario Fadda and Jannuzi, {Buell Tomasson} and Alyson Ford and Siorrie-Lombardi, {Lisa J.}",
year = "2004",
month = "7",
doi = "10.1086/421366",
language = "English (US)",
volume = "128",
pages = "1--15",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "1 1783",

}

TY - JOUR

T1 - The spitzer space telescope first-look survey

T2 - KPNO mosaic-1 R-band images and source catalogs

AU - Fadda, Dario

AU - Jannuzi, Buell Tomasson

AU - Ford, Alyson

AU - Siorrie-Lombardi, Lisa J.

PY - 2004/7

Y1 - 2004/7

N2 - We present R-band images covering more than 11 square degrees of sky that were obtained in preparation for the Spitzer Space Telescope First-Look Survey (FLS). The FLS was designed to characterize the mid-infrared sky at depths 2 orders of magnitude deeper than previous surveys. The extragalactic component is the first cosmological survey done with Spitzer. Source catalogs extracted from the R-band images are also presented. The R-band images were obtained using the Mosaic-1 camera on the 4 m Mayall Telescope of the Kitt Peak National Observatory. Two relatively large regions of the sky were observed to modest depth: the main FLS extragalactic field (17 h18 m00 s, +59°30′00″.0 [J2000]; l = 88°.3, b = +34°.9) and the ELAIS-N1 field (16 h10 m01 s, +54°30′36″.0; l = 84°.2, b = +44°.9). While both these fields were in early plans for the FLS, only a single deep-pointing test observation was made at the ELAIS-N1 location. The larger Legacy program SWIRE will include this region among its surveyed areas. The data products of our KPNO imaging (images and object catalogs) are made available to the community through the World Wide Web (via the Spitzer Science Center and NOAO Science Archive). The overall quality of the images is high. The measured positions of sources detected in the images have rms uncertainties in their absolute positions on the order of 0″.35 with possible systematic offsets on the order of 0″.1, depending on the reference frame of comparison. The relative astrometric accuracy is much better than 1/10 of an arcsecond. Typical delivered image quality in the images is 1″.1 full width at half-maximum. The images are relatively deep, since they reach a median 5 σ depth limiting magnitude of R = 25.5 (Vega) as measured within a 1.35 FWHM aperture, for which the signal-to-noise ratio (S/N) is maximal. Catalogs have been extracted with SExtractor, using thresholds in area and flux for which the number of false detections is below 1% at R = 25. Only sources with S/N > 3 have been retained in the final catalogs. Comparing the galaxy number counts from our images with those of deeper R-band surveys, we estimate that our observations are 50% complete at R = 24.5. These limits in depth are sufficient to identify a substantial fraction of the infrared sources that will be detected by Spitzer.

AB - We present R-band images covering more than 11 square degrees of sky that were obtained in preparation for the Spitzer Space Telescope First-Look Survey (FLS). The FLS was designed to characterize the mid-infrared sky at depths 2 orders of magnitude deeper than previous surveys. The extragalactic component is the first cosmological survey done with Spitzer. Source catalogs extracted from the R-band images are also presented. The R-band images were obtained using the Mosaic-1 camera on the 4 m Mayall Telescope of the Kitt Peak National Observatory. Two relatively large regions of the sky were observed to modest depth: the main FLS extragalactic field (17 h18 m00 s, +59°30′00″.0 [J2000]; l = 88°.3, b = +34°.9) and the ELAIS-N1 field (16 h10 m01 s, +54°30′36″.0; l = 84°.2, b = +44°.9). While both these fields were in early plans for the FLS, only a single deep-pointing test observation was made at the ELAIS-N1 location. The larger Legacy program SWIRE will include this region among its surveyed areas. The data products of our KPNO imaging (images and object catalogs) are made available to the community through the World Wide Web (via the Spitzer Science Center and NOAO Science Archive). The overall quality of the images is high. The measured positions of sources detected in the images have rms uncertainties in their absolute positions on the order of 0″.35 with possible systematic offsets on the order of 0″.1, depending on the reference frame of comparison. The relative astrometric accuracy is much better than 1/10 of an arcsecond. Typical delivered image quality in the images is 1″.1 full width at half-maximum. The images are relatively deep, since they reach a median 5 σ depth limiting magnitude of R = 25.5 (Vega) as measured within a 1.35 FWHM aperture, for which the signal-to-noise ratio (S/N) is maximal. Catalogs have been extracted with SExtractor, using thresholds in area and flux for which the number of false detections is below 1% at R = 25. Only sources with S/N > 3 have been retained in the final catalogs. Comparing the galaxy number counts from our images with those of deeper R-band surveys, we estimate that our observations are 50% complete at R = 24.5. These limits in depth are sufficient to identify a substantial fraction of the infrared sources that will be detected by Spitzer.

KW - Catalogs

KW - Galaxies: photometry

UR - http://www.scopus.com/inward/record.url?scp=4544318603&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4544318603&partnerID=8YFLogxK

U2 - 10.1086/421366

DO - 10.1086/421366

M3 - Article

AN - SCOPUS:4544318603

VL - 128

SP - 1

EP - 15

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 1 1783

ER -