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Photometric Redshift Estimation of Quasars: Local versus Global Regression

Abstract (Expand)

The task of estimating an object's redshift based on photometric data is one of the most important ones in astronomy. This is especially the case for quasars. Common approaches for this regression … task are based on nearest neighbor search, template fitting schemes, or combinations of, e.g., clustering and regression techniques. As we show in this work, simple frameworks like k-nearest neighbor regression work extremely well if one considers the overall feature space (containing patterns of all objects with low, middle, and high redshifts). However, such methods naturally fail as soon as only very few or even no training patterns are given in the appropriate region of the feature space. In the literature, a wide range of other regression techniques can be found. Among the most popular ones are regularized regression schemes like ridge regression or support vector regression. In this work, we show that an out-of-the-box application of this type of schemes for the whole feature space is difficult due to the involved computational requirements and the specific properties of the data at hand. However, in contrast to nearest neighbor search schemes, such methods can be employed to extrapolate, i.e., they can be used to predict redshifts for patterns in new, unseen regions of the feature space.

Authors: F. Gieseke, Kai L. Polsterer, Peter-Christian Zinn

Date Published: 1st Sep 2012

Publication Type: InProceedings

Black Hole Mass Estimates Based on C IV are Consistent with Those Based on the Balmer Lines

Abstract

Not specified

Authors: R. J. Assef, K. D. Denney, C. S. Kochanek, B. M. Peterson, S. Kozłowski, N. Ageorges, R. S. Barrows, P. Buschkamp, M. Dietrich, E. Falco, C. Feiz, H. Gemperlein, A. Germeroth, C. J. Grier, R. Hofmann, M. Juette, R. Khan, M. Kilic, V. Knierim, W. Laun, R. Lederer, M. Lehmitz, R. Lenzen, U. Mall, K. K. Madsen, H. Mandel, P. Martini, S. Mathur, K. Mogren, P. Mueller, V. Naranjo, A. Pasquali, K. Polsterer, R. W. Pogge, A. Quirrenbach, W. Seifert, D. Stern, B. Shappee, C. Storz, J. Van Saders, P. Weiser, D. Zhang

Date Published: 1st Dec 2011

Publication Type: Journal

Infrared Narrowband Tomography of the Local Starburst NGC 1569 with the Large Binocular Telescope/LUCIFER.

Abstract

Not specified

Authors: A. Pasquali, A. Bik, S. Zibetti, N. Ageorges, W. Seifert, W. Brandner, H.-W. Rix, M. Jütte, V. Knierim, P. Buschkamp, C. Feiz, H. Gemperlein, A. Germeroth, R. Hofmann, W. Laun, R. Lederer, M. Lehmitz, R. Lenzen, U. Mall, H. Mandel, P. Müller, V. Naranjo, K. Polsterer, A. Quirrenbach, L. Schäffner, C. Storz, P. Weiser

Date Published: 1st Apr 2011

Publication Type: Journal

Detecting Quasars in Large-Scale Astronomical Surveys

Abstract

Not specified

Authors: Fabian Gieseke, Kai Lars Polsterer, Andreas Thom, Peter Zinn, Dominik Bomanns, Ralf-Jurgen Dettmar, Oliver Kramer, Jan Vahrenhold

Date Published: 1st Dec 2010

Publication Type: InProceedings

The LUCIFER control software

Abstract

Not specified

Authors: Marcus Jütte, Volker Knierim, Kai Polsterer, Michael Lehmitz, Clemens Storz, Walter Seifert, Nancy Ageorges

Date Published: 19th Jul 2010

Publication Type: Journal

LUCIFER1 commissioning at the LBT

Abstract

Not specified

Authors: N. Ageorges, W. Seifert, M. Jütte, V. Knierim, M. Lehmitz, A. Germeroth, P. Buschkamp, K. Polsterer, A. Pasquali, V. Naranjo, H. Gemperlein, J. Hill, C. Feiz, R. Hofmann, W. Laun, R. Lederer, R. Lenzen, U. Mall, H. Mandel, P. Müller, A. Quirrenbach, L. Schäffner, C. Storz, P. Weiser

Date Published: 13th Jul 2010

Publication Type: Journal

The LUCIFER MOS: a full cryogenic mask handling unit for a near-infrared multi-object spectrograph

Abstract

Not specified

Authors: Peter Buschkamp, Reiner Hofmann, Hans Gemperlein, Kai Polsterer, Nancy Ageorges, Frank Eisenhauer, Reinhard Lederer, Mathias Honsberg, Marcus Haug, Johann Eibl, Walter Seifert, Reinhard Genzel

Date Published: 13th Jul 2010

Publication Type: Journal

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