One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

G. Matt; M. G. Uainazzi; R. Maiolino; S. Molendi; G. C. Perola; L. A. Antonelli; L. Bassani; W. N. Brandt; A. C. Fabian; F. Fiore; K. Iwasawa; G. Malaguti; A. Marconi; J. Poutanen

One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

G. Matt, M. G. Uainazzi, R. Maiolino, S. Molendi, G. C. Perola, L. A. Antonelli, L. Bassani, W. N. Brandt, A. C. Fabian, F. Fiore, K. Iwasawa, G. Malaguti, A. Marconi, J. Poutanen

Research output: Contribution to journal › Review article › peer-review

84 Scopus citations

Abstract

The Circinus Galaxy has been observed, for the first time above 10keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1-10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of ∼ 4 × 10²⁴ cm^-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.

Original language	English (US)
Pages (from-to)	L39-L42
Journal	Astronomy and Astrophysics
Volume	341
Issue number	2
State	Published - Dec 1 1999

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Cite this

@article{42e948063d394e4f8b641037a8e18a52,

title = "One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays",

abstract = "The Circinus Galaxy has been observed, for the first time above 10keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1-10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of ∼ 4 × 1024 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.",

author = "G. Matt and Uainazzi, {M. G.} and R. Maiolino and S. Molendi and Perola, {G. C.} and Antonelli, {L. A.} and L. Bassani and Brandt, {W. N.} and Fabian, {A. C.} and F. Fiore and K. Iwasawa and G. Malaguti and A. Marconi and J. Poutanen",

year = "1999",

month = dec,

day = "1",

language = "English (US)",

volume = "341",

pages = "L39--L42",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - One more surprise from the Circinus Galaxy

T2 - BeppoSAX discovery of a transmission component in hard X-rays

AU - Matt, G.

AU - Uainazzi, M. G.

AU - Maiolino, R.

AU - Molendi, S.

AU - Perola, G. C.

AU - Antonelli, L. A.

AU - Bassani, L.

AU - Brandt, W. N.

AU - Fabian, A. C.

AU - Fiore, F.

AU - Iwasawa, K.

AU - Malaguti, G.

AU - Marconi, A.

AU - Poutanen, J.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - The Circinus Galaxy has been observed, for the first time above 10keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1-10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of ∼ 4 × 1024 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.

AB - The Circinus Galaxy has been observed, for the first time above 10keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1-10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of ∼ 4 × 1024 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy.

UR - http://www.scopus.com/inward/record.url?scp=0002466914&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002466914&partnerID=8YFLogxK

M3 - Review article

AN - SCOPUS:0002466914

SN - 0004-6361

VL - 341

SP - L39-L42

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays

Abstract

All Science Journal Classification (ASJC) codes

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