| Type |
Conference Paper |
| Names |
Laura Trouille, Amy Barger, Christy Tremonti |
| Proceedings Title |
Multiwavelength AGN Surveys and Studies |
| Conference Name |
IAU Symposium |
| Volume |
304 |
| Pages |
221-224 |
| Date |
July 1, 2014 |
| DOI |
10.1017/S1743921314003822 |
| ISBN |
1743-9221 |
| URL |
http://adsabs.org/2014IAUS.304.221T |
| Library Catalog |
adslabs.org |
| Abstract |
The Baldwin, Phillips, and Terlevich emission-line ratio diagnostic ([OIII]/Hβ versus [NII]/Hα, hereafter BPT diagram)
efficiently separates galaxies whose signal is dominated by star formation (BPT-SF) from those dominated by AGN activity (BPT-AGN). Yet the BPT diagram is limited to z<0.5, the redshift at which
[NII]λ6584 leaves the optical spectral window. Using the Sloan
Digital Sky Survey (SDSS), we construct a new diagnostic, or TBT diagram, that is based on rest-frame g-z color, [NeIII]λ3869, and [OII]λλ3726+3729 and can be used for galaxies out to
z<1.4. The TBT diagram identifies 98.7% of the SDSS BPT-AGN as
TBT-AGN and 97% of the SDSS BPT-SF as TBT-SF. Furthermore, it identifies 97% of the OPTX Chandra X-ray selected AGNs as TBT-AGN. This is in contrast to the BPT diagram, which misidentifies 20% of X-ray selected AGNs as BPT-SF. |
| Tags |
X-rays: galaxies, cosmology: observations, galaxies: Seyfert, galaxies: active, galaxies: distances and redshifts, galaxies: nuclei |