Eigenspectra of the SDSS DR1 quasars
| dc.creator | Yip, Ching-Wa | |
| dc.creator | Connolly, Andrew | |
| dc.creator | Berk, Daniel Vanden | |
| dc.creator | Ma, Zhaoming | |
| dc.creator | Frieman, Joshua | |
| dc.creator | SubbaRao, Mark | |
| dc.creator | Szalay, Alex | |
| dc.date | 2004-03-23 | |
| dc.date.accessioned | 2026-07-07T02:12:43Z | |
| dc.date.available | 2026-07-07T02:12:43Z | |
| dc.description | We construct eigenspectra from the DR1 quasars in the SDSS using the Karhunen-Loève (KL) transform (or Principal Component Analysis, PCA) in different redshift and luminosity bins. We find that the quasar spectra can be classified, by the first two eigenspectra, into a continuous sequence in the variation of the spectral slope. We also find a dependence on redshift and luminosity in the eigencoefficients. The dominant redshift effect is the evolution of the blended Fe~II emission (optical) and the Balmer continuum (the ``small-bump'', $λ_{rest} \approx 2000-4000$Å), while the luminosity effect is related to the Baldwin effect. Correlations among several major broad emission lines are found, including the well-known ``Eigenvector-1''. | |
| dc.description | 4 pages, 2 figures, "AGN Physics with the Sloan Digital Sky Survey" ASP Conference Series | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0403560 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0403560 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/7551 | |
| dc.subject | Astrophysics | |
| dc.title | Eigenspectra of the SDSS DR1 quasars | |
| dc.type | text |