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A window to the Galactic X‐ray halo: The ISM towards the Lockman hole
Author(s) -
Kappes M.,
Kerp J.
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200310048
Subject(s) - astrophysics , physics , halo , sky , astronomy , galactic corona , galactic halo , active galactic nucleus , galaxy
We present a combined X-ray/HI-analysis of the ISM towards the Lockman hole.This sky region is considered as the "window to the distant universe" becauseof its absolute lowest HI column density on the whole sky. The Lockman holeappears to be not as transparent as the HI data suggest. We propose that abouthalf of the ISM towards the Lockman hole is in form of ionized hydrogen ratherthan HI.Comment: Proceedings, International Workshop on X-RAY SURVEYS, in the light of new observatories Santander (Spain), 4-6 September 2000 (accepted