To be or not to be : the case of the hot WHIM absorption in the blazar PKS 2155-304 sight line

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Nevalainen , J , Tempel , E , Ahoranta , J , Liivamägi , L J , Bonamente , M , Tilton , E , Kaastra , J , Fang , T , Heinämäki , P , Saar , E & Finoguenov , A 2019 , ' To be or not to be : the case of the hot WHIM absorption in the blazar PKS 2155-304 sight line ' , Astronomy & Astrophysics , vol. 621 , 88 . https://doi.org/10.1051/0004-6361/201833109

Title: To be or not to be : the case of the hot WHIM absorption in the blazar PKS 2155-304 sight line
Author: Nevalainen, J.; Tempel, E.; Ahoranta, J.; Liivamägi, L. J.; Bonamente, M.; Tilton, E.; Kaastra, J.; Fang, T.; Heinämäki, P.; Saar, E.; Finoguenov, A.
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-01-14
Language: eng
Number of pages: 11
Belongs to series: Astronomy & Astrophysics
ISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201833109
URI: http://hdl.handle.net/10138/308401
Abstract: The cosmological missing baryons at z <1 most likely hide in the hot (T greater than or similar to 10(5.5) K) phase of the warm hot intergalactic medium (WHIM). While the hot WHIM is hard to detect due to its high ionisation level, the warm (T less than or similar to 10(5.5) K) phase of the WHIM has been very robustly detected in the far-ultraviolet (FUV) band. We adopted the assumption that the hot and warm WHIM phases are co-located and therefore used the FUV-detected warm WHIM as a tracer for the cosmologically interesting hot WHIM. We performed an X-ray follow-up in the sight line of the blazar PKS 2155-304 at the redshifts where previous FUV measurements of O VI, Si IV, and broad Lyman-alpha (BLA) absorption have indicated the existence of the warm WHIM. We looked for the O VII Hc alpha and O VIII Ly alpha absorption lines, the most likely hot WHIM tracers. Despite the very large exposure time (approximate to 1 Ms), the Reflection Grating Spectrometer unit 1 (RGS1) on-board XMM-Newton data yielded no significant detection which corresponds to upper limits of log N(O VII (cm(-2)))
Subject: BL Lacertae objects: individual: PKS 2155-304
intergalactic medium
large-scale structure of Universe
cosmology: observations
X-RAY-ABSORPTION
INTERGALACTIC MEDIUM
O-VI
PHYSICAL-PROPERTIES
XMM-NEWTON
GAS
BARYONS
EVOLUTION
CHANDRA
115 Astronomy, Space science
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