NGC 5506 Unmasked as a Narrow Line Seyfert 1: A Direct View of the Broad Line Region using Near-IR Spectroscopy

Details NGC 5506 Unmasked as a Narrow Line Seyfert 1: A Direct View of the Broad Line Region using Near-IR Spectroscopy NGC 5506 Unmasked as a Narrow Line Seyfert 1: A Direct View of the Broad Line Region using Near-IR Spectroscopy

2002-07-19

arxiv.org/abs/astro-ph/0207432v1

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in A&A Letters

Scientific paper

10.1051/0004-6361:20021039

This letter presents incontrovertible evidence that NGC5506 is a Narrow Line Seyfert 1 (NLSy1). Our new 0.9-1.4 micron spectrum of its nucleus clearly shows the permitted OI 1.1287 micron line (with full width at half maximum <2000 km/s) and the `1 micron FeII lines'. These lines can only originate in the optically-thick broad line region (BLR) and, among Seyfert nuclei the latter series of lines are seen only in NLSy1s. The obscuration to the BLR, derived from a rough estimate of the OI 1.1287 micron / OI 8446 Angstrom ratio and from the reddening of the near-IR Paschen lines, is A_v > 5. Together, these results make NGC5506 the first identified case of an optically-obscured NLSy1. This new classification helps explain its radio to X-ray properties, which until now were considered highly anomalous. However, interesting new concerns are raised: e.g., NGC5506 is unusual in hosting both a `type 1' AGN and a nuclear water vapor megamaser. As the brightest known NLSy1, NGC5506 is highly suitable for study at wavebands less affected by obscuration.

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