X-rays from the highly polarized broad absorption line QSO CSO 755

W. N. Brandt; A. Comastri; S. C. Gallagher; R. M. Sambruna; Th Boller; A. Laor

doi:10.1086/312346

X-rays from the highly polarized broad absorption line QSO CSO 755

W. N. Brandt, A. Comastri, S. C. Gallagher, R. M. Sambruna, Th Boller, A. Laor

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Abstract

We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z = 2.88) and most optically luminous (M_v = -27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are able to place only loose constraints upon its X-ray spectral shape. Our X-ray detection is consistent with the hypothesis that the BAL QSOs with high optical continuum polarization tend to be the X-ray brighter members of the class. We examine a scattering interpretation of a polarization/X-ray flux connection, and we discuss the data needed to prove or refute such a connection. We also discuss a probable ROSAT detection of CSO 755. The observed-frame 2-10 keV flux from BeppoSAX (1.3 × 10^-13 ergs cm^-2 s^-1) is high enough to allow X-Ray Multimirror Mission spectroscopy, and studies of iron K-line emission should prove of particular interest if a large amount of scattered X-ray flux is present.

Original language	English (US)
Pages (from-to)	L69-L72
Journal	Astrophysical Journal
Volume	525
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/312346
State	Published - Nov 10 1999

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/312346

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@article{7b63f61d15674eeb80c7bdd5c42bb288,

title = "X-rays from the highly polarized broad absorption line QSO CSO 755",

abstract = "We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z = 2.88) and most optically luminous (Mv = -27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are able to place only loose constraints upon its X-ray spectral shape. Our X-ray detection is consistent with the hypothesis that the BAL QSOs with high optical continuum polarization tend to be the X-ray brighter members of the class. We examine a scattering interpretation of a polarization/X-ray flux connection, and we discuss the data needed to prove or refute such a connection. We also discuss a probable ROSAT detection of CSO 755. The observed-frame 2-10 keV flux from BeppoSAX (1.3 × 10-13 ergs cm-2 s-1) is high enough to allow X-Ray Multimirror Mission spectroscopy, and studies of iron K-line emission should prove of particular interest if a large amount of scattered X-ray flux is present.",

author = "Brandt, {W. N.} and A. Comastri and Gallagher, {S. C.} and Sambruna, {R. M.} and Th Boller and A. Laor",

note = "Funding Information: We thank J. Halpern, J. Nousek, W. Voges, and B. Wills for helpful discussions, and we thank H. Ebeling for the use of his IDL software. We acknowledge the support of NASA Long-Term Space Astrophysics grant NAG5-8107 (W. N. B.), Italian Space Agency contract ASI-ARS-98-119 and MURST grant Cofin-98-02-32 (A. C.), NASA grant NAG5-4826 and the Pennsylvania Space Grant Consortium (S. C. G.), and the fund for the promotion of research at the Technion (A. L.).",

year = "1999",

month = nov,

day = "10",

doi = "10.1086/312346",

language = "English (US)",

volume = "525",

pages = "L69--L72",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2 PART 2",

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TY - JOUR

T1 - X-rays from the highly polarized broad absorption line QSO CSO 755

AU - Brandt, W. N.

AU - Comastri, A.

AU - Gallagher, S. C.

AU - Sambruna, R. M.

AU - Boller, Th

AU - Laor, A.

N1 - Funding Information: We thank J. Halpern, J. Nousek, W. Voges, and B. Wills for helpful discussions, and we thank H. Ebeling for the use of his IDL software. We acknowledge the support of NASA Long-Term Space Astrophysics grant NAG5-8107 (W. N. B.), Italian Space Agency contract ASI-ARS-98-119 and MURST grant Cofin-98-02-32 (A. C.), NASA grant NAG5-4826 and the Pennsylvania Space Grant Consortium (S. C. G.), and the fund for the promotion of research at the Technion (A. L.).

PY - 1999/11/10

Y1 - 1999/11/10

N2 - We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z = 2.88) and most optically luminous (Mv = -27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are able to place only loose constraints upon its X-ray spectral shape. Our X-ray detection is consistent with the hypothesis that the BAL QSOs with high optical continuum polarization tend to be the X-ray brighter members of the class. We examine a scattering interpretation of a polarization/X-ray flux connection, and we discuss the data needed to prove or refute such a connection. We also discuss a probable ROSAT detection of CSO 755. The observed-frame 2-10 keV flux from BeppoSAX (1.3 × 10-13 ergs cm-2 s-1) is high enough to allow X-Ray Multimirror Mission spectroscopy, and studies of iron K-line emission should prove of particular interest if a large amount of scattered X-ray flux is present.

AB - We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z = 2.88) and most optically luminous (Mv = -27.4) BAL QSO seen in X-rays. It is detected in several energy bands including the rest-frame 21-39 keV band, but we are able to place only loose constraints upon its X-ray spectral shape. Our X-ray detection is consistent with the hypothesis that the BAL QSOs with high optical continuum polarization tend to be the X-ray brighter members of the class. We examine a scattering interpretation of a polarization/X-ray flux connection, and we discuss the data needed to prove or refute such a connection. We also discuss a probable ROSAT detection of CSO 755. The observed-frame 2-10 keV flux from BeppoSAX (1.3 × 10-13 ergs cm-2 s-1) is high enough to allow X-Ray Multimirror Mission spectroscopy, and studies of iron K-line emission should prove of particular interest if a large amount of scattered X-ray flux is present.

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UR - http://www.scopus.com/inward/citedby.url?scp=0033544221&partnerID=8YFLogxK

U2 - 10.1086/312346

DO - 10.1086/312346

M3 - Article

AN - SCOPUS:0033544221

VL - 525

SP - L69-L72

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 2

ER -

X-rays from the highly polarized broad absorption line QSO CSO 755

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