EXPLORATORY X-RAY MONITORING OF LUMINOUS RADIO-QUIET QUASARS AT HIGH REDSHIFT: INITIAL RESULTS

We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 [< or =, slant] z [< or =, slant] 4.35, monitored by Chandra, and the second is a comparison sample of three sourc...

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Published inThe Astrophysical journal Vol. 783; no. 2; pp. 1 - 18
Main Authors Shemmer, Ohad, Brandt, W N, Paolillo, Maurizio, Kaspi, Shai, Vignali, Cristian, Stein, Matthew S, Lira, Paulina, Schneider, Donald P, Gibson, Robert R
Format Journal Article
LanguageEnglish
Published United States 10.03.2014
Subjects
Accessibility
Active galactic nuclei
Assessments
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Benchmarking
BENCHMARKS
COMPARATIVE EVALUATIONS
DESIGN
ENERGY SPECTRA
EXTRAPOLATION
GALAXY NUCLEI
LUMINOSITY
Monitoring
QUASARS
RED SHIFT
X RADIATION
X-RAY GALAXIES
X-rays
Online AccessGet full text

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Abstract We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 [< or =, slant] z [< or =, slant] 4.35, monitored by Chandra, and the second is a comparison sample of three sources at 1.33 [< or =, slant] z [< or =, slant] 2.74, monitored by Swift. Six of these sources show significant X-ray variability over rest-frame timescales of ~10 super(2)-10 super(3) days; three of these also show significant X-ray variability on rest-frame timescales of ~1-10 days. The X-ray variability properties of our variable sources are similar to those exhibited by nearby and far less luminous active galactic nuclei (AGNs). This result may be attributed to luminous sources at the highest redshifts having relatively high accretion rates. This project is designed to provide a basic assessment of the X-ray variability properties of RQQs at the highest accessible redshifts that will serve as a benchmark for more systematic monitoring of such sources with future X-ray missions.
AbstractList We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 [< or =, slant] z [< or =, slant] 4.35, monitored by Chandra, and the second is a comparison sample of three sources at 1.33 [< or =, slant] z [< or =, slant] 2.74, monitored by Swift. Six of these sources show significant X-ray variability over rest-frame timescales of ~10 super(2)-10 super(3) days; three of these also show significant X-ray variability on rest-frame timescales of ~1-10 days. The X-ray variability properties of our variable sources are similar to those exhibited by nearby and far less luminous active galactic nuclei (AGNs). This result may be attributed to luminous sources at the highest redshifts having relatively high accretion rates. This project is designed to provide a basic assessment of the X-ray variability properties of RQQs at the highest accessible redshifts that will serve as a benchmark for more systematic monitoring of such sources with future X-ray missions.
We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of four sources at 4.10 ≤ z ≤ 4.35, monitored by Chandra, and the second is a comparison sample of three sources at 1.33 ≤ z ≤ 2.74, monitored by Swift. Together with archival X-ray data, the total rest-frame temporal baseline spans ∼2-4 yr and ∼5-13 yr for the first and second group, respectively. Six of these sources show significant X-ray variability over rest-frame timescales of ∼10{sup 2}-10{sup 3} days; three of these also show significant X-ray variability on rest-frame timescales of ∼1-10 days. The X-ray variability properties of our variable sources are similar to those exhibited by nearby and far less luminous active galactic nuclei (AGNs). While we do not directly detect a trend of increasing X-ray variability with redshift, we do confirm previous reports of luminous AGNs exhibiting X-ray variability above that expected from their luminosities, based on simplistic extrapolation from lower luminosity sources. This result may be attributed to luminous sources at the highest redshifts having relatively high accretion rates. Complementary UV-optical monitoring of our sources shows that variations in their optical-X-ray spectral energy distribution are dominated by the X-ray variations. We confirm previous reports of X-ray spectral variations in one of our sources, HS 1700+6416, but do not detect such variations in any of our other sources in spite of X-ray flux variations of up to a factor of ∼4. This project is designed to provide a basic assessment of the X-ray variability properties of RQQs at the highest accessible redshifts that will serve as a benchmark for more systematic monitoring of such sources with future X-ray missions.
Author Paolillo, Maurizio
Stein, Matthew S
Brandt, W N
Kaspi, Shai
Vignali, Cristian
Lira, Paulina
Gibson, Robert R
Schneider, Donald P
Shemmer, Ohad
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BackLink https://www.osti.gov/biblio/22351576$$D View this record in Osti.gov
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Snippet We present initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars (RQQs). The first consists of...
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SubjectTerms Accessibility
Active galactic nuclei
Assessments
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Benchmarking
BENCHMARKS
COMPARATIVE EVALUATIONS
DESIGN
ENERGY SPECTRA
EXTRAPOLATION
GALAXY NUCLEI
LUMINOSITY
Monitoring
QUASARS
RED SHIFT
X RADIATION
X-RAY GALAXIES
X-rays
Title EXPLORATORY X-RAY MONITORING OF LUMINOUS RADIO-QUIET QUASARS AT HIGH REDSHIFT: INITIAL RESULTS
URI https://search.proquest.com/docview/1701492701
https://search.proquest.com/docview/1718938991
https://www.osti.gov/biblio/22351576
Volume 783
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