Michael Strauss
Michael Strauss
Michael Strauss
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• Very few objects<br />
are detected in soft<br />
X-rays in ROSAT,<br />
consistent with<br />
absorption by H<br />
gas.<br />
• Six objects have<br />
Chandra or XMM<br />
hard X-ray<br />
detections,<br />
consistent with<br />
implied<br />
luminosities, and<br />
with column<br />
densities of > few<br />
¥ 10 22 cm -2<br />
Ptak et al. 2005
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