J/ApJ/475/445 VIK photometry of faint field galaxies (Moustakas+ 1997)
Colors and K-band counts of extremely faint field galaxies. Moustakas L.A., Davis M., Graham J.R., Silk J., Peterson B.A., Yoshii Y. <Astrophys. J. 475, 445 (1997)> =1997ApJ...475..445M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, infrared Keywords: cosmology: observations - galaxies: evolution - galaxies: photometry - galaxies: statistics - infrared: galaxies Abstract: We combine deep K-band (W. M. Keck Telescope) with V- and I-band (New Technology Telescope) observations of two "blank" high Galactic latitude fields, surveying a total of ∼2arcmin2. The K-band number-magnitude counts continue to rise above K∼22mag, reaching surface densities of few x105deg-2. The slope for the galaxy counts is approximately [dlog(N)/dmag].deg-2=0.23±0.02 over the range 18-23mag. While this slope is consistent with other recent deep K-band surveys, there is a definite scatter in the normalisations by about a factor of 2. In particular, our normalisation is ∼2x greater than the galaxy counts reported by Djorgovski et al. in 1995 (1995ApJ...438L..13D). Optical near-infrared color-magnitude and color-color diagrams for all objects detected in the V+I+K image are plotted and discussed in the context of grids of Bruzual-Charlot isochrone synthesis galaxy evolutionary models. The colors of most of the observed galaxies are consistent with a population drawn from a broad redshift distribution. A few galaxies at K∼19-20 are red in both colors (V-I>3; I-K>2, consistent with being early-type galaxies having undergone a burst of star formation at z>5 and viewed at z∼1. At K>20, we find several (approximately eight) "red outlier" galaxies with I-K>4 and V-I<2.5, whose colors are difficult to mimic by a single evolving or nonevolving stellar population at any redshift unless they either have quite low metallicity or are highly reddened. We compare the data against the evolutionary tracks of second-burst ellipticals and against a grid of models that does not constrain galaxy ages to a particular formation redshift. The red outliers' surface density is several per square arcminute, which is so high that they are probably common objects of low luminosity L<L*. Whether these are low-metallicity, dusty dwarf galaxies, or old galaxies at high redshift, they are curious and merit spectroscopic follow-up. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4 57 116 Object catalog for field I table5 57 111 Object catalog for field II
Byte-by-byte Description of file: table4 table5
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (
1950) 4- 5 I2 min RAm Right ascension ( 1950) 7- 11 F5.2 s RAs Right ascension ( 1950) 14 A1 --- DE- Declination sign 15- 16 I2 deg DEd Declination ( 1950) 18- 19 I2 arcmin DEm Declination ( 1950) 21- 25 F5.2 arcsec DEs Declination ( 1950) 28- 32 F5.1 arcsec xpos X position (1) 35- 39 F5.1 arcsec ypos Y position (1) 42- 45 F4.1 mag Vmag V magnitude (2) 48- 51 F4.1 mag Imag I magnitude (2) 54- 57 F4.1 mag Kmag K magnitude
Note (1): North is up, East is left. Note (2): When the magnitude is '0.0', no reliable value.
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 24-Oct-1997
|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|