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|Morphology of Spitzer 24 μm Detected Galaxies in the UDF: The Links between Star Formation and Galaxy Morphology|
We have studied the morphologies of infrared-luminous galaxies at0.3<=z<1.4 in the HST Ultra Deep Field (UDF) by calculatingconcentration and asymmetry indices and comparing the results withsimilar calculations for: (1) galaxies at similar redshift that are lessinfrared-active, and (2) local luminous infrared galaxies [LIRGs;LIR(8-1000 μm)>1011 Lsolar]. Wefind that the high-redshift samples are dominated by galaxies withconcentrations similar to local late-type disk galaxies; however, theyare significantly more asymmetric than most local galaxies but aresimilar in both regards to local LIRGs. On average, the high-redshiftinfrared-active galaxies are slightly more asymmetric than the lessactive ones, although they do include a significantly higher portion ofhighly asymmetric (merging?) systems and a lower portion of moreconcentrated, symmetric ones. The morphological similarity ofinfrared-active and typical infrared-inactive galaxies at high redshiftsuggests that they may be from the same parent population, but are indifferent stages of an episodic star formation process. The similaritybetween high redshift and local LIRGs suggests that a certain level ofasymmetry is generally associated with LIRG-level activity.
|ESO imaging survey: infrared observations of CDF-S and HDF-S|
This paper presents infrared data obtained from observations carried outat the ESO 3.5 m New Technology Telescope (NTT) of the Hubble Deep FieldSouth (HDF-S) and the Chandra Deep Field South (CDF-S). These data weretaken as part of the ESO Imaging Survey (EIS) program, a public surveyconducted by ESO to promote follow-up observations with the VLT. In theHDF-S field the infrared observations cover an area of ~53 squarearcmin, encompassing the HST WFPC2 and STIS fields, in theJHKs passbands. The seeing measured in the final stackedimages ranges from 0.79 arcsec to 1.22 arcsec and the median limitingmagnitudes (AB system, 2'' aperture, 5σ detection limit) areJ_AB˜23.0, H_AB˜22.8 and K_AB˜23.0 mag. Less completedata are also available in JKs for the adjacent HST NICMOSfield. For CDF-S, the infrared observations cover a total area of ~100square arcmin, reaching median limiting magnitudes (as defined above) ofJ_AB˜23.6 and K_AB˜22.7 mag. For one CDF-S field H band dataare also available. This paper describes the observations and presentsthe results of new reductions carried out entirely through theun-supervised, high-throughput EIS Data Reduction System and itsassociated EIS/MVM C++-based image processing library developed, overthe past 5 years, by the EIS project and now publicly available. Thepaper also presents source catalogs extracted from the final co-addedimages which are used to evaluate the scientific quality of the surveyproducts, and hence the performance of the software. This is donecomparing the results obtained in the present work with those obtainedby other authors from independent data and/or reductions carried outwith different software packages and techniques. The final science-gradecatalogs together with the astrometrically and photometricallycalibrated co-added images are available at CDS.
|The GOODS-MUSIC sample: a multicolour catalog of near-IR selected galaxies in the GOODS-South field|
Aims. We present a high quality multiwavelength (from 0.3 to 8.0 μm)catalog of the large and deep area in the GOODS Southern Field coveredby the deep near-IR observations obtained with the ESO VLT. Methods. Thecatalog is entirely based on public data: in our analysis, we haveincluded the F435W, F606W, F775W and F850LP ACS images, the JHKs VLTdata, the Spitzer data provided by IRAC instrument (3.6, 4.5, 5.8 and8.0 μm), and publicly available U-band data from the 2.2ESO andVLT-VIMOS. We describe in detail the procedures adopted to obtain thismultiwavelength catalog. In particular, we developed a specific softwarefor the accurate "PSF-matching" of space and ground-based images ofdifferent resolution and depth (ConvPhot), of which we analyseperformances and limitations. We have included both z-selected, as wellas Ks-selected objects, yielding a unique, self-consistent catalog. Thelargest fraction of the sample is 90% complete at z≃ 26 or Ks≃23.8 (AB scale). Finally, we cross-correlated our data with all thespectroscopic catalogs available to date, assigning a spectroscopicredshift to more than 1000 sources. Results. The final catalog is madeup of 14 847 objects, at least 72 of which are known stars, 68 are AGNs,and 928 galaxies with spectroscopic redshift (668 galaxies with reliableredshift determination). We applied our photometric redshift code tothis data set, and the comparison with the spectroscopic sample showsthat the quality of the resulting photometric redshifts is excellent,with an average scatter of only 0.06. The full catalog, which we namedGOODS-MUSIC (MUltiwavelength Southern Infrared Catalog), including thespectroscopic information, is made publicly available, together with thesoftware specifically designed to this end.
|The Near-Infrared Camera and Multi-Object Spectrometer Ultra Deep Field: Observations, Data Reduction, and Galaxy Photometry|
This paper describes the observations and data reduction techniques forthe version 2.0 images and catalog of the Near-Infrared Camera andMulti-Object Spectrometer Ultra Deep Field (NICMOS UDF) Treasuryprogram. All sources discussed in this paper are based on detections inthe combined NICMOS F110W and F160W bands only. The NICMOS images aredrizzled to 0.09" pixel-1 and aligned to the Advanced Camerafor Surveys UDF F850LP image, which was rebinned to the same pixelscale. These form the NICMOS version 2.0 UDF images. The catalog sourcesare chosen with a conservative detection limit to avoid the inclusion ofnumerous spurious sources. The catalog contains 1293 objects in the144''×144'' NICMOS subfield of the UDF. The5 σ signal-to-noise ratio level is an average 0.6" diameteraperture AB magnitude of 27.7 at 1.1 and 1.6 μm. The catalog sources,listed in order of right ascension, satisfy a minimum signal-to-noiseratio criterion of 1.4 σ in at least seven contiguous pixels ofthe combined F110W and F160W image.
|H-band observations of the Chandra Deep Field South|
We report results of our H-band survey of the Chandra Deep Field South(CDFS). The observations, made with SofI on the NTT, cover 0.027 squaredegrees to H< 20.5 and 0.17 square degrees to H< 19.8 (50%completeness limits). In total, 4819 objects were detected, of which 80%are galaxies based on the SExtractor parameter ``stellarity index''having a value less than 0.5. Our astrometric solutions are in goodagreement with those of the Las Campanas Infrared Survey (LCIRS), theCOMBO-17, and the ESO-EIS surveys. Our photometry comparessatisfactorily with the LCIRS results as well as with GOODS data. Galaxynumber counts are ~ 50 000 galaxies per square degree at H< 20.75,in good agreement with those of LCIRS. The object catalog is publishedelectronically at the CDS.The whole catalog is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/403/493}.Based on observations collected at the European Southern Observatory,Chile under programs 66.A-0451 and 68.A-0375.
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