Generating on-the-fly large samples of theoretical spectra through N-dimensional grid (2009)
Many analyses and parameter estimations undertaken in astronomy require a large set (> 10^5) of non-analytical, theoretical spectra, each of these defined by multiple parameters. We describe the...
Reliable eigenspectra for new generation surveys (2009)
Budavári, Tamás, Wild, Vivienne, Szalay, Alexander S., Dobos, László, Yip, Ching-Wa
Yip, Ching-Wa, Connolly, Andrew, Berk, Daniel Vanden, Scranton, Ryan, Krughoff, Simon, Szalay, Alex, ...
Under the unified model for active galactic nuclei (AGNs), narrow-line (Type 2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured accretion disk. We would therefore expect...
Reliable Eigenspectra for New Generation Surveys (2008)
Budavari, Tamas, Wild, Vivienne, Szalay, Alexander S., Dobos, Laszlo, Yip, Ching-Wa
We present a novel technique to overcome the limitations of the applicability of Principal Component Analysis to typical real-life data sets, especially astronomical spectra. Our new approach...
Spectroscopic Surveys: Present (2007)
I summarize the current spectroscopic sky surveys and some of the scientific results, emphasizing the largest sky survey to-date, the Sloan Digital Sky Survey (SDSS). Techniques used commonly in...
Separating Physical Components from Galaxy Spectra by Subspace Methods (2007)
Yip, Ching-Wa, Szalay, Alex S., Connolly, Andrew, Budavari, Tamas
Using subspace methods, we study the distribution of physical components of galaxies in wavelength space. We find that it is valid to assume that the stellar and the gaseous components of galaxies...
Radial Dependency of Stellar Population Properties in Disk Galaxies from SDSS Photometry (2007)
Yip, Ching-Wa, Wyse, Rosemary F. G.
The evolution of stellar disks is of great importance for understanding many aspects of galaxy formation. In this work we perform stellar population synthesis on radially resolved photometry of 564...
Average Extinction Curves and Relative Abundances for QSO Absorption Line Systems at 1 (2006)
York, Donald G., Khare, Pushpa, Berk, Daniel Vanden, Kulkarni, Varsha P., Crotts, Arlin P. S., Lauroesch, James T., ...
We have studied a sample of 809 Mg II absorption systems with 1.0 < z_abs < 1.86 in the spectra of SDSS QSOs, with the aim of understanding the nature and abundance of the dust and the chemical...
Spectral decomposition of broad-line AGNs and host galaxies (2006)
Vanden Berk, Daniel E., Shen, Jiajian, Yip, Ching-Wa, Schneider, Donald P., Connolly, Andrew J., Burton, Ross E., ...
Using an eigenspectrum decomposition technique, we separate the host galaxy from the broad-line active galactic nucleus (AGN) in a set of 4666 spectra from the Sloan Digital Sky Survey (SDSS), from...
In the first part of this thesis, we study spectral decompositions of galaxies and quasars (QSOs) by the Karhunen-Lo`eve (KL) transform using the Sloan Digital Sky Survey (SDSS). Our goal is to...
In the first part of this thesis, we study spectral decompositions of galaxies and quasars (QSOs) by the Karhunen-Lo`eve (KL) transform using the Sloan Digital Sky Survey (SDSS). Our goal is to...
Spectral Decomposition of Broad-Line AGNs and Host Galaxies (2005)
Berk, Daniel E. Vanden, Shen, Jiajian, Yip, Ching-Wa, Schneider, Donald P., Connolly, Andrew J., Burton, Ross E., ...
Using an eigenspectrum decomposition technique, we separate the host galaxy from the broad line active galactic nucleus (AGN) in a set of 4666 spectra from the Sloan Digital Sky Survey (SDSS), from...
The third data release of the sloan digital sky survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Third Data Release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
The third data release of the Sloan Digital Sky Survey (2005)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
This paper describes the Third Data Release of the Sloan Digital Sky Survey (SDSS). This release, containing data taken up through 2003 June, includes imaging data in five bands over 5282 deg²,...
Distributions of Galaxy Spectral Types in the Sloan Digital Sky Survey (2004)
Yip, Ching-Wa, Connolly, Andrew, Szalay, Alex, Budavari, Tamas, SubbaRao, Mark, Frieman, Joshua, ...
We perform an objective classification of 170,000 galaxy spectra in the Sloan Digital Sky Survey (SDSS) using the Karhunen-Lo\`eve (KL) transform. With about one-sixth of the total set of galaxy...
Eigenspectra of the SDSS DR1 quasars (2004)
Yip, Ching-Wa, Connolly, Andrew, Berk, Daniel Vanden, Ma, Zhaoming, Frieman, Joshua, SubbaRao, Mark, ...
We construct eigenspectra from the DR1 quasars in the SDSS using the Karhunen-Lo\`eve (KL) transform (or Principal Component Analysis, PCA) in different redshift and luminosity bins. We find that the...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Second Data Release of the Sloan Digital sky survey (2004)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
The second data release of the Sloan Digital Sky Survey (2004)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Kurt S. J., Anderson, Scott F., ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg(2) of five-band (ugriz) imaging data with photometry for...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The first data release of the sloan digital sky survey (2003)
Abazajian, Kevork, Adelman-McCarthy, Jennifer K., Agüeros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The first data release of the Sloan Digital Sky Survey (2003)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its First Data Release. This consists of 2099 deg2 of five-band (u, g, r, i, z) imaging data, 186,240 spectra of...
The first data release of the Sloan Digital Sky Survey (2003)
Abazajian, Kevork N., Adelman-McCarthy, Jennifer K., Agueros, Marcel A., Allam, Sahar S., Anderson, Scott F., Annis, James, ...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its First Data Release. This consists of 2099 deg2 of five-band (u, g, r, i, z) imaging data, 186,240 spectra of...