X-ray variability in a deep, flux-limited sample of QSOs

O. Almaini; A. Lawrence; T. Shanks; A. Edge; B. J. Boyle; I. Georgantopoulos; K. F. Gunn; G. C. Stewart; R. E. Griffiths

X-ray variability in a deep, flux-limited sample of QSOs

O. Almaini, A. Lawrence, T. Shanks, A. Edge, B. J. Boyle, I. Georgantopoulos, K. F. Gunn, G. C. Stewart, R. E. Griffiths

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

We present an analysis of X-ray variability in a flux-limited sample of quasi-stellar objects (QSOs). Selected from our deep ROSAT survey, these QSOs span a wide range in redshift (0.10.5) do not show the anticorrelation with luminosity seen in local AGN. We speculate on the implications of these results for physical models of AGN and their evolution. Finally, we find evidence for X-ray variability in an object classified as a narrow-emission-line galaxy, suggesting the presence of an AGN.

Original language	English
Pages (from-to)	325-336
Journal	Monthly Notices of the Royal Astronomical Society
Volume	315
Issue number	2
Publication status	Published - 1 Jun 2000

Keywords / Materials (for Non-textual outputs)

GALAXIES: ACTIVE
GALAXIES: EVOLUTION
GALAXIES: NUCLEI
QUASARS: GENERAL
X-RAYS: GALAXIES
X-RAYS: GENERAL

Access to Document

http://adsabs.harvard.edu/abs/2000MNRAS.315..325A

Cite this

@article{ba358460c5284027b9f330e891f2e554,

title = "X-ray variability in a deep, flux-limited sample of QSOs",

abstract = "We present an analysis of X-ray variability in a flux-limited sample of quasi-stellar objects (QSOs). Selected from our deep ROSAT survey, these QSOs span a wide range in redshift (0.10.5) do not show the anticorrelation with luminosity seen in local AGN. We speculate on the implications of these results for physical models of AGN and their evolution. Finally, we find evidence for X-ray variability in an object classified as a narrow-emission-line galaxy, suggesting the presence of an AGN.",

keywords = "GALAXIES: ACTIVE, GALAXIES: EVOLUTION, GALAXIES: NUCLEI, QUASARS: GENERAL, X-RAYS: GALAXIES, X-RAYS: GENERAL",

author = "O. Almaini and A. Lawrence and T. Shanks and A. Edge and Boyle, {B. J.} and I. Georgantopoulos and Gunn, {K. F.} and Stewart, {G. C.} and Griffiths, {R. E.}",

year = "2000",

month = jun,

day = "1",

language = "English",

volume = "315",

pages = "325--336",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

TY - JOUR

T1 - X-ray variability in a deep, flux-limited sample of QSOs

AU - Almaini, O.

AU - Lawrence, A.

AU - Shanks, T.

AU - Edge, A.

AU - Boyle, B. J.

AU - Georgantopoulos, I.

AU - Gunn, K. F.

AU - Stewart, G. C.

AU - Griffiths, R. E.

PY - 2000/6/1

Y1 - 2000/6/1

N2 - We present an analysis of X-ray variability in a flux-limited sample of quasi-stellar objects (QSOs). Selected from our deep ROSAT survey, these QSOs span a wide range in redshift (0.10.5) do not show the anticorrelation with luminosity seen in local AGN. We speculate on the implications of these results for physical models of AGN and their evolution. Finally, we find evidence for X-ray variability in an object classified as a narrow-emission-line galaxy, suggesting the presence of an AGN.

AB - We present an analysis of X-ray variability in a flux-limited sample of quasi-stellar objects (QSOs). Selected from our deep ROSAT survey, these QSOs span a wide range in redshift (0.10.5) do not show the anticorrelation with luminosity seen in local AGN. We speculate on the implications of these results for physical models of AGN and their evolution. Finally, we find evidence for X-ray variability in an object classified as a narrow-emission-line galaxy, suggesting the presence of an AGN.

KW - GALAXIES: ACTIVE

KW - GALAXIES: EVOLUTION

KW - GALAXIES: NUCLEI

KW - QUASARS: GENERAL

KW - X-RAYS: GALAXIES

KW - X-RAYS: GENERAL

M3 - Article

SN - 0035-8711

VL - 315

SP - 325

EP - 336

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

X-ray variability in a deep, flux-limited sample of QSOs

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

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Cite this