Results 41 to 50 of about 47,826 (245)

Feature importance for machine learning redshifts applied to SDSS galaxies [PDF]

, 2015
We present an analysis of importance feature selection applied to photometric redshift estimation using the machine learning architecture Decision Trees with the ensemble learning routine Adaboost (hereafter RDF).
Hoyle, Ben, Rau, Markus Michael, Seitz, Stella, Weller, Jochen, Zitlau, Roman   +4 more
core   +1 more source

Ensemble photometric redshifts

, 2019
5 pages, 3 ...
Padmanabhan, Nikhil, White, Martin, Chang, Tzu-Ching, Cohn, JD, Dore, Olivier, Holder, Gil   +5 more
openaire   +3 more sources

Photometric redshifts and quasar probabilities from a single, data-driven generative model

, 2012
We describe a technique for simultaneously classifying and estimating the redshift of quasars. It can separate quasars from stars in arbitrary redshift ranges, estimate full posterior distribution functions for the redshift, and naturally incorporate ...
Abazajian, Abell, Adam D. Myers, Aihara, Assef, Atlee, Ball, Ball, Baum, Benjamin A. Weaver, Benítez, Bovy, Bowen, Budavári, Butler, David Schiminovich, David W. Hogg, Donald P. Schneider, Eisenstein, Erin S. Sheldon, Fan, Francis, Glikman, Gunn, Gunn, Hennawi, Hennawi, Hennawi, Hennawi, Hogg, Hook, Hopkins, Hutchings, Ivezić, Ivezić, Ivezić, Jimenez, Jo Bovy, Jon Brinkmann, Joseph F. Hennawi, Jurić, Kaczmarczik, Kelly, Kozłowski, Kozłowski, Lupton, MacLeod, MacLeod, Martin, Morrissey, Myers, Myers, Myers, Myers, Møller, Padmanabhan, Peth, Picard, Pier, Prochaska, Richard G. McMahon, Richards, Richards, Richards, Richards, Richards, Richards, Richards, Ross, Schlegel, Schmidt, Schneider, Scranton, Scranton, Shen, Smith, Stoughton, Suchkov, Trammell, Vanden Berk, Weinstein, Worseck, Yip, York   +83 more
core   +1 more source

Uncertain Photometric Redshifts

, 2016
Photometric redshifts play an important role as a measure of distance for various cosmological topics. Spectroscopic redshifts are only available for a very limited number of objects but can be used for creating statistical models. A broad variety of photometric catalogues provide uncertain low resolution spectral information for galaxies and quasars ...
Polsterer, Kai Lars, D'Isanto, Antonio, Gieseke, Fabian   +2 more
openaire   +2 more sources

QUANTIFYING PHOTOMETRIC REDSHIFT ERRORS IN THE ABSENCE OF SPECTROSCOPIC REDSHIFTS [PDF]

The Astrophysical Journal, 2010
9 pages in ApJ format, 8 figures.
Quadri, Ryan F., Williams, Rik J.
openaire   +2 more sources

Accuracy of the Photometric Redshifts of Brightest Cluster Galaxies Identified in the CFHTLS-W1

Journal of Advanced Research in Natural and Applied Sciences
We determine the accuracy of photometric redshifts for the brightest cluster galaxies (BCGs) identified in the W1 field of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS).
Sinan Aliş
doaj   +1 more source

Active Galactic Nuclei Search

Atoms, 2017
We present the first results of medium-band photometric observations on the 1m Schmidt Telescope of Byurakan Astrophysical Observatory (Armenia). The object sample was created in the SA68 field.
Sergey Kotov, Sergey Dodonov
doaj   +1 more source

Physical Characterization of Early Galaxies in the Webb’s First Deep Field SMACS J0723.3-7327

The Astrophysical Journal Letters, 2023
This paper highlights initial photometric analyses of JWST NIRCam imaging data in the sightline of SMACS0723, aiming to identify galaxies at redshift z > 7.
T. Morishita, M. Stiavelli
doaj   +1 more source

Cosmological baryonic and matter densities from 600,000 SDSS Luminous Red Galaxies with photometric redshifts

, 2006
We analyze MegaZ-LRG, a photometric-redshift catalogue of Luminous Red Galaxies (LRGs) based on the imaging data of the Sloan Digital Sky Survey (SDSS) 4th Data Release.
Blake, Chris, Bridle, Sarah, Collister, Adrian, Lahav, Ofer   +3 more
core   +2 more sources

LEVERAGING 3D-HST GRISM REDSHIFTS TO QUANTIFY PHOTOMETRIC REDSHIFT PERFORMANCE [PDF]

The Astrophysical Journal, 2016
ABSTRACT We present a study of photometric redshift accuracy in the 3D-HST photometric catalogs, using 3D-HST grism redshifts to quantify and dissect trends in redshift accuracy for galaxies brighter than JH IR > 24 with an unprecedented and representative high-redshift galaxy sample.
Bezanson, R., Wake, D., Brammer, G., Dokkum, P. van, Franx, M., Labbé, I.F.L., Leja, J., Momcheva, I., Nelson, E., Quadri, R., Skelton, R., Weiner, B., Whitaker, K.   +12 more
openaire   +5 more sources