A SEYFERT-2-LIKE SPECTRUM IN THE HIGH-MASS X-RAY BINARY MICROQUASAR V4641 SGR

We present an analysis of three archival Chandra observations of the black hole V4641 Sgr, performed during a decline into quiescence. The last two observations in the sequence can be modeled with a simple power law. The first spectrum, however, is remarkably similar to spectra observed in Seyfert-2...

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Published in:Astrophysical journal. Letters 2014-05, Vol.786 (2), p.1-5
Main Authors: Morningstar, Warren R, Miller, Jon M, Reynolds, M T, Maitra, Dipankar
Format: Article
Language:English
Subjects:
ACCRETION DISKS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic properties
Binary stars
BLACK HOLES
Black holes (astronomy)
EMISSION SPECTRA
GALAXY NUCLEI
JETS
MASS
Microquasars
POTENTIALS
Power law
REFLECTION
SEYFERT GALAXIES
Spectra
X-RAY SPECTRA
X-ray stars
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cited_by cdi_FETCH-LOGICAL-c388t-5a8a9c168c9f584c2bc4aa8b2c83fbeca379da97d866da83cf61de622c8ba3bd3
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container_title Astrophysical journal. Letters
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creator Morningstar, Warren R
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Reynolds, M T
Maitra, Dipankar
description We present an analysis of three archival Chandra observations of the black hole V4641 Sgr, performed during a decline into quiescence. The last two observations in the sequence can be modeled with a simple power law. The first spectrum, however, is remarkably similar to spectra observed in Seyfert-2 active galactic nuclei, which arise through a combination of obscuration and reflection from distant material. This spectrum of V4641 Sgr can be fit extremely well with a model including partial-covering absorption and distant reflection. This model recovers a [Gamma] [Asymptotically = to] 2.0 power-law incident spectrum, typical of black holes at low Eddington fractions. The implied geometry is plausible in a high-mass X-ray binary like V4641 Sgr, and may be as compelling as explanations invoking Doppler-split line pairs in a jet, and/or unusual Comptonization. We discuss potential implications and means of testing these models.
doi_str_mv 10.1088/2041-8205/786/2/L20
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source Free E-Journal (出版社公開部分のみ）
subjects ACCRETION DISKS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic properties
Binary stars
BLACK HOLES
Black holes (astronomy)
EMISSION SPECTRA
GALAXY NUCLEI
JETS
MASS
Microquasars
POTENTIALS
Power law
REFLECTION
SEYFERT GALAXIES
Spectra
X-RAY SPECTRA
X-ray stars
title A SEYFERT-2-LIKE SPECTRUM IN THE HIGH-MASS X-RAY BINARY MICROQUASAR V4641 SGR
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