Photometric Redshift Biases from Galaxy Evolution

@article{Macdonald2010PhotometricRB,
  title={Photometric Redshift Biases from Galaxy Evolution},
  author={Christopher John Macdonald and Gary M. Bernstein},
  journal={Publications of the Astronomical Society of the Pacific},
  year={2010},
  volume={122},
  pages={485-489}
}
Proposed cosmological surveys will make use of photometric redshifts of galaxies that are significantly fainter than any complete spectroscopic redshift surveys that exist to train the photo-z methods. We investigate the photo-z biases that result from known differences between the faint and bright populations: a rise in active galactic nucleus (AGN) activity toward higher redshift, and a metallicity difference between intrinsically luminous and faint early-type galaxies. We find that even very… Expand

Figures from this paper

Reconstructing Redshift Distributions with Cross-correlations: Tests and an Optimized Recipe
Many of the cosmological tests to be performed by planned dark energy experiments will require extremely well-characterized photometric redshift measurements. Current estimates for cosmic shear areExpand
Inferring the photometric and size evolution of galaxies from image simulations
Current constraints on the luminosity and size evolution of galaxies rely on catalogs extracted from multi-band surveys. However resulting catalogs are altered by selection effects difficult to modelExpand
CHARACTERIZING AND PROPAGATING MODELING UNCERTAINTIES IN PHOTOMETRICALLY-DERIVED REDSHIFT DISTRIBUTIONS
The uncertainty in the redshift distributions of galaxies has a significant potential impact on the cosmological parameter values inferred from multi-band imaging surveys. The accuracy of theExpand
ZFOURGE catalogue of AGN candidates: an enhancement of 160-μm-derived star formation rates in active galaxies to z = 3.2
We investigate active galactic nuclei (AGN) candidates within the FourStar Galaxy Evolution Survey (ZFOURGE) to determine the impact they have on star formation in their host galaxies. We firstExpand
Cosmology from cosmic shear with Dark Energy Survey science verification data
We present the first constraints on cosmology from the Dark Energy Survey (DES), using weak lensing measurements from the preliminary Science Verification (SV) data. We use 139 square degrees of SVExpand
Photometric redshift estimation: An active learning approach
TLDR
This work uses active learning following a Query by Committee approach to solve the problem of accurate estimation of galaxy distances based solely on the information contained in photometric filters, and shows how a relatively small number of queries suffices to improve the performance of photometric redshift estimators significantly. Expand
Giga-z: A 100,000 Object Superconducting Spectrophotometer for LSST Follow-up
We simulate the performance of a new type of instrument, a Superconducting Multi-Object Spectrograph (SuperMOS), that uses microwave kinetic inductance detectors (MKIDs). MKIDs, a new detectorExpand
On the realistic validation of photometric redshifts
Two of the main problems encountered in the development and accurate validation of photometric redshift (photo-z) techniques are the lack of spectroscopic coverage in feature space (e.g. colours andExpand

References

SHOWING 1-10 OF 14 REFERENCES
Measuring the Redshift Evolution of Clustering: the Hubble Deep Field South
ABSTRA C T We present an analysis of the evolution of galaxy clustering in the redshift interval 0 # z # 4:5 in the Hubble Deep Field South (HDF-South). The HST optical data are combined withExpand
Colors, Magnitudes, and Velocity Dispersions in Early-Type Galaxies: Implications for Galaxy Ages and Metallicities
We present an analysis of the color–magnitude–velocity dispersion relation for a sample of 39,320 early-type galaxies within the Sloan Digital Sky Survey. We demonstrate that the color-magnitudeExpand
Measuring and modelling the redshift evolution of clustering: the Hubble Deep Field North
ABSTRA C T The evolution of galaxy clustering from za 0t oz . 4:5 is analysed using the angular correlation function and the photometric redshift distribution of galaxies brighter than IAB < 28:5 inExpand
Systematic errors in future weak-lensing surveys: requirements and prospects for self-calibration
We study the impact of systematic errors on planned weak-lensing surveys and compute the requirements on their contributions so that they are not a dominant source of the cosmological parameter errorExpand
Object classification in astronomical multi-color surveys
We present a photometric method for identifying stars, galaxies and quasars in multi-color surveys, which uses a library of > 65000 color templates for comparison with observed objects. The methodExpand
Stellar population synthesis at the resolution of 2003
We present a new model for computing the spectral evolution of stellar populations at ages between 1 x 10 5 and 2 x 10 1 0 yr at a resolution of 3 A across the whole wavelength range from 3200 toExpand
Composite Quasar Spectra from the Sloan Digital Sky Survey
We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 ≤ zExpand
Bayesian Photometric Redshift Estimation
Photometric redshifts are quickly becoming an essential tool of observational cosmology, although their utilization is somewhat hindered by certain shortcomings of the existing methods, e.g., theExpand
A near-infrared spectral template for quasars
We present a near-infrared quasar composite spectrum spanning the wavelength range 0.58-3.5 μm. The spectrum has been constructed from observations of 27 quasars obtained at the NASA IRTF telescopeExpand
Colors and magnitudes predicted for high redshift galaxies
Ultraviolet observations of nearby galaxies with the ANS are used to derive ultraviolet spectra for different galaxy types. These spectra are used with existing visible spectrophotometry to calculateExpand
...
1
2
...