Probing AGN Unification with High-Resolution Spectroscopic and Imaging Observations of NGC 2110

Details Probing AGN Unification with High-Resolution Spectroscopic and Imaging Observations of NGC 2110 Probing AGN Unification with High-Resolution Spectroscopic and Imaging Observations of NGC 2110

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1304e&link_type=abstract

American Astronomical Society, HEAD meeting #10, #13.04

Astronomy and Astrophysics

Astronomy

Scientific paper

X-ray grating spectroscopy, combined with high-resolution imaging, are powerful tools for probing the nuclear and circumnuclear environments of Seyfert galaxies. Here, we present Chandra HETGS (250 ks), ACIS-S (50 ks) and XMM-Newton RGS (60 ks) imaging and spectroscopic observations of NGC 2110, a source classified as a Narrow Emission Line Galaxy, the subclass of Seyferts historically noted for their particularly flat X-ray spectra. Although the nuclear X-ray spectrum of NGC 2110 can be modeled as a power law of photon index Γ𕛑.4 absorbed by a column of 3x1022 cm-2, the excess absorption we detect at the Si K and Fe K edges implies the need for a more complex spectral model, which we find in the form of a "canonical" Γ𕛑.7 AGN spectrum modified by patchy absorption from multiple layers of neutral material. The measured photon index and high intrinsic absorption of the nuclear spectrum of NGC 2110 are consistent with that of a typical Seyfert 2 galaxy, which demonstrates that NELG are typical AGN viewed through slightly more complex absorption, rather than a separate subclass of objects on their own. Based on additional multiwavelength imaging studies, we also find resolved soft X-ray emission 160 pc north of the nucleus, which is spatially coincident with [OIII] emission (HST), but lies just beyond the northern edge of the small-scale radio jet in the source. Taken with the evidence for ionized emission in the HETGS spectra of NGC 2110, we suggest that both photoionization and collisional ionization processes play a role in the circumnuclear environment of the source.

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