Near‐Infrared and X‐Ray Obscuration to the Nucleus of the Seyfert 2 Galaxy NGC 3281 | Zendy

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Near‐Infrared and X‐Ray Obscuration to the Nucleus of the Seyfert 2 Galaxy NGC 3281

Author(s) -

Chris Simpson

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306506

Subject(s) - physics , astrophysics , galaxy , extinction (optical mineralogy) , line of sight , infrared , astronomy , luminous infrared galaxy , milky way , nucleus , active galactic nucleus , optics , medicine , psychiatry

We present the results of a near-infrared and X-ray study of the Seyfert 2galaxy NGC 3281. Emission from the Seyfert nucleus is detected in both regionsof the electromagnetic spectrum, allowing us to infer both the equivalent lineof sight hydrogen column density, N_H = 71.0(+11.3,-12.3)e26/m^2 and theextinction due to dust, A_V = 22+/-11 magnitudes (90% confidence intervals). Weinfer a ratio of N_H/A_V which is an order of magnitude larger than thatdetermined along lines of sight in the Milky Way and discuss possibleinterpretations. We consider the most plausible explanation to be a dense cloudin the foreground of both the X-ray and infrared emitting regions whichobscures the entire X-ray source but only a fraction of the much largerinfrared source.Comment: 23 pages including 9 figure

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