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J/ApJ/642/L13     ECDFS MUSYC galaxies UBVRIzNB5000 photometry  (Gawiser+, 2006)

The physical nature of Lyα-emitting galaxies at z=3.1. Gawiser E., van Dokkum P.G., Gronwall C., Ciardullo R., Blanc G.A., Castander F.J., Feldmeier J., Francke H., Franx M., Haberzettl L., Herrera D., Hickey T., Infante L., Lira P., Maza J., Quadri R., Richardson A., Schawinski K., Schirmer M., Taylor E.N., Treister E., Urry C.M., Virani S.N. <Astrophys. J., 642, L13-L16 (2006)> =2006ApJ...642L..13G
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, UBVRI ; Photometry, narrow-band Keywords: galaxies: high-redshift Abstract: We selected 40 candidate Lyα-emitting galaxies (LAEs) at z∼3.1 with observed-frame equivalent widths greater than 150Å and inferred emission-line fluxes above 2.5x10-17ergs/cm2/s from deep narrowband and broadband MUSYC images of the Extended Chandra Deep Field South. Covering 992-arcmin2, this is the largest "blank field" surveyed for LAEs at z∼3, allowing an improved estimate of the space density of this population of (3±1)x104h/Mpc3. Spectroscopic follow-up of 23 candidates yielded 18 redshifts, all at z∼3.1. Over 80% of the LAEs are dimmer in continuum magnitude than the typical Lyman break galaxy (LBG) spectroscopic limit of R=25.5 (AB), with a median continuum magnitude R∼27 and very blue continuum colors, V-z~=0. Description: Our narrowband imaging of the ECDF-S was obtained using the narrowband 5000Å filter (NB5000; 50Å FWHM) with the CTIO 4m telescope and MOSAIC II on several nights from 2002 to 2004 for a total of 29hr of exposure time. Our UBVRI imaging results from combining public images taken with the ESO 2.2m and WFI by the ESO Deep Public Survey and COMBO-17 teams. Our z' imaging was taken with the CTIO 4m and MOSAIC II on 2005 January 15. Our JK images of the ECDF-S were obtained with the CTIO 4m and ISPI on several nights during 2003-2004 Images and other information available at; see Gawiser et al. 2007, Cat. J/ApJS/162/1 for full description including detailed definition and simulation of APCORR photometry method. No psf-matching was performed as we seek high S/N for small objects AUTO and APCORR both estimate total fluxes, AUTO via Kron elliptical aperture, and APCORR via small ∼FWHM-sized apertures plus correction based on half-light radius and curve-of-growth measured for point sources. AUTO slightly underestimates total fluxes, APCORR is unbiased, APCORR offers higher S/N but is less robust for highly extended sources. Corrected for Galactic extinction of E(B-V)=0.01 (Schlegel et al., 1998ApJ...500..525S). Flux densities are in microJy and correspond to an AB zeropoint of 23.9: magAB=-2.5*log10(flux)+23.9 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file nbdetzo3.dat 715 28297 MUSYC ECDF-S, NB5000(=o3)-detected catalog with UBVRIzo3 photometry, V1, 2005/15/10 ubvrizo3.dat 715 84410 MUSYC ECDF-S, BVR-detected catalog with UBVRIzo3 photometry, V1, 2005/15/10
See also: J/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010) Byte-by-byte Description of file: nbdetzo3.dat ubvrizo3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq [0/884409] Sequential number (1) 7- 15 F9.7 h RAhour Right ascension in decimal hours (J2000), BVR detection image 17- 26 F10.6 deg DEdeg Declination in decimal degrees (J2000), BVR detection image 28- 37 F10.5 pix X X barycenter (BVR detection image) 39- 48 F10.5 pix Y Y barycenter (BVR detection image) 50- 57 F8.6 --- S/G [0/1] SExtractor star/galaxy classifier (0=Galaxy, 1=Star; BVR detection image) 59- 70 F12.7 arcsec Rhl Halflight radius 72- 83 F12.7 arcsec A Flux distribution rms along major axis 85- 96 F12.7 arcsec B Flux distribution rms along minor axis 98-108 F11.7 deg theta Position angle counterclockwise from x-axis 110-124 F15.8 uJy Fopt BVR AUTO Sextractor flux 126-137 F12.8 uJy e_Fopt Uncertainty in flux 139-154 F16.9 uJy FU U AUTO Sextractor flux 156-170 F15.10 uJy e_FU Uncertainty in FU 172-187 F16.9 uJy FB B AUTO Sextractor flux 189-203 F15.10 uJy e_FB Uncertainty in FB 205-220 F16.9 uJy FV V AUTO Sextractor flux 222-236 F15.10 uJy e_FV Uncertainty in FV 238-253 F16.9 uJy FR R AUTO Sextractor flux 255-269 F15.10 uJy e_FR Uncertainty in FR 271-286 F16.9 uJy FI I AUTO Sextractor flux 288-302 F15.10 uJy e_FI Uncertainty in FI 304-319 F16.9 uJy Fz z AUTO Sextractor flux 321-335 F15.10 uJy e_Fz Uncertainty in Fz 337-352 F16.9 uJy Fo3 NB5000 (o3) AUTO Sextractor flux (3) 354-368 F15.10 uJy e_Fo3 Uncertainty in Fo3 370-385 F16.9 uJy Foptap BVR corrected aperture (APCORR) Sextractor flux 387-404 E18.9 uJy e_Foptap Uncertainty in fluxap 406-421 F16.9 uJy FUap U corrected aperture (APCORR) Sextractor flux 423-440 E18.9 uJy e_FUap Uncertainty in FUap 442-457 F16.9 uJy FBap B corrected aperture (APCORR) Sextractor flux 459-476 E18.9 uJy e_FBap Uncertainty in FBap 478-493 F16.9 uJy FVap V corrected aperture (APCORR) Sextractor flux 495-514 E20.9 uJy e_FVap Uncertainty in FVap 516-531 F16.9 uJy FRap R corrected aperture (APCORR) Sextractor flux 533-552 E20.9 uJy e_FRap Uncertainty in FRap 554-569 E16.9 uJy FIap I corrected aperture (APCORR) Sextractor flux 571-592 E22.9 uJy e_FIap Uncertainty in FIap 594-609 E16.9 uJy Fzap z corrected aperture (APCORR) Sextractor flux 611-633 E23.9 uJy e_Fzap Uncertainty in Fzap 635-650 F16.9 uJy Fo3ap NB5000 (o3) corrected aperture (APCORR) (3) Sextractor flux 652-671 E20.9 uJy e_Fo3ap Uncertainty in Fo3ap 673-674 I2 --- f.opt SExtractor flags for BVR (2) 676-677 I2 --- f.U SExtractor flags for U (2) 679-680 I2 --- f.B SExtractor flags for B (2) 682-683 I2 --- f.V SExtractor flags for V (2) 685-686 I2 --- f.R SExtractor flags for R (2) 688-689 I2 --- f.I SExtractor flags for I (2) 691-692 I2 --- f.Z SExtractor flags for z (2) 694-695 I2 --- f.o3 SExtractor flags for o3 (2) 697-715 A19 --- MUSYC Object MUSYC name (
Note (1): Sources identified as <[GVG2006] NB NNNNN> for nbdetzo3.dat catalog, <[GVG2006] BRV NNNNN> for ubvrizo3.dat catalog. Note (2): SExtractor flag FLAGS contain, coded in additive numbers, all the extraction flags as a sum of powers of 2: 1 = The object has neighbours, bright and close enough to significantly bias the MAG AUTO photometry or bad pixels (more than 10% of the integrated area affected) 2 = The object was originally blended with another one 4 = At least one pixel of the object is saturated (or very close to) 8 = The object is truncated (too close to an image boundary) 16 = Object's aperture data are incomplete or corrupted 32 = Object's isophotal data are incomplete or corrupted 64 = A memory overflow occurred during deblending 128 = A memory overflow occurred during extraction Note (3): NB5000 is a narrow-band filter centered at λ=500nm with a FWHM=5nm.
History: Copied at
(End) Patricia Vannier [CDS] 19-Apr-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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