Difference: Analyses ( vs. 1)

SEDM Spectroscopic Look at AGN of Various Types

The purpose of this document is to compare how different AGN subtypes (e.g. Sy1, Sy2, QSO, Blazar, etc. identified with archival or follow-up observations) appear when observed at the resolution of the P60, so as to maintain a healthy skepticism and avoid mistaking spectral features for true variability or other transient types based solely on Marshal annotations. Navigate to a subtype from the table of contents, and to the source page on the Marshal from the figure caption.

• sedm-spectra-agn.pdf: Browseable Catalog of SEDM Spectra for AGN Subtypes (contact: Sara Frederick)

Findings:

• An empirical threshold to distinguish between broad-line and narrow-line AGN: ~125 A
• SNID only auto-matches to a QSO/AGN template in 2 out of 7 cases, (both for broadline quasars); in one case being "forced" to seek fits to Non-SN templates improves accuracy for a Sy1 spectral fit
• [OII] and [NII] doublets are nearly always blended with Halpha and Hbeta respectively, due to their narrow widths

Action Items:

• Do we want to include more AGN templates to the bank used by the SEDM pipeline? Currently there are only 5 out of >300
• For all SEDM spectra on our Reports Page, measure FWHM of Halpha+[NII] and push annotation to the Marshal

-- SaraFrederick - 25 May 2018