An Imaging Observation of NGC 4051 IN the Low State

Details An Imaging Observation of NGC 4051 IN the Low State An Imaging Observation of NGC 4051 IN the Low State

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..666u&link_type=abstract

Chandra Proposal ID #02700521

Computer Science

Chandra Proposal Id #02700521

Scientific paper

Since 1996, the nearby Seyfert galaxy NGC 4051 has entered two unusual low X-ray states, lasting several months each. The low state spectrum measured by RXTE, BeppoSAX and EUVE is dominated by two constant components, a hard torus-reflection component, and a soft component below 4 keV which is due to extended emission (seen by the ROSAT HRI), which is unresolved in our previous low-state observations. Significant EUV variability during the low state also indicates the presence of residual soft emission from the central source, whose spectrum will provide important clues as to the nature of the low states. Here we propose a 50 ksec TOO observation of NGC 4051 in the low state with the ACIS-S, to clearly separate the residual central source spectrum from that of the extended emission.

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