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  • Wilkes, Belinda (14)
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  • Quasars$:$ (14)
  • X Ray Spectra (9)
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The X-ray and ultraviolet absorbing outflow in 3C 351 

Mathur, Smita; Wilkes, Belinda Jane; Elvis, Martin S.; Fiore, Fabrizio (IOP Publishing, 1994)
3C 351 (z = 0.371), and X-ray-'quiet' quasar, is one of the few quasars showing signs of a 'warm absorber' in its X-ray spectrum; i.e., partially ionized absorbing material in the line of sight whose opacity depends on its ...
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Absorption in X-ray spectra of high-redshift quasars 

Elvis, Martin S.; Fiore, Fabrizio; Wilkes, Belinda Jane; McDowell, Jonathan Christopher; Bechtold, Jill (IOP Publishing, 1994)
We present evidence that X-ray absorption is common in high-redshift quasars. We have studied six high-redshift (z approximately 3) quasars with the ROSAT Position Sensitive Proportional Counter (PSPC) of which four are ...
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The complex optical to soft x-ray spectrum of the low-redshift radio-quiet quasars 

Fiore, Fabrizio; Elvis, Martin S.; McDowell, Jonathan Christopher; Siemiginowska, Aneta L.; Wilkes, Belinda Jane (IOP Publishing, 1994)
Eight high signal-to-noise ROSAT Position Sensitive Proportional Counter (PSPC) observations of six low-redshift (o.048 less than z less than 0.155) radio-quiet quasars have been analyzed to study ant soft excess. All the ...
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Infrared to x-ray spectral energy distributions of high redshift quasars 

Bechtold, Jill; Elvis, Martin S.; Fiore, Fabrizio; Kuhn, Olga; Cutri, Roc M.; McDowell, Jonathan Christopher; Rieke, Marcia; Siemiginowska, Aneta L.; Wilkes, Belinda Jane (IOP Publishing, 1994)
We have observed 14 quasars with z greater than 2.8 with the ROSAT-PSPC, and detected 12 of them, including the z=4.11 quasar 0000-263. We present the first x-ray spectrum of a radio quiet quasar with z greater than 3, ...
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Consistency of spherical, gravity-dominated dynamics with quasar high-ionization emission-line profiles 

Kallman, T. R.; Wilkes, Belinda Jane; Krolik, J. H.; Green, Richard (IOP Publishing, 1993)
Line profile data are used to test a simple kinematic model - spherically symmetric gravitational free fall - in which the number of free parameters is limited by requiring physical self-consistency. The predictions of ...
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PKS 0483-436 - A high-redshift quasar with strong X-ray absorption 

Wilkes, Belinda Jane; Elvis, Martin S.; Fiore, Fabrizio; McDowell, Jonathan Christopher; Tananbaum, Harvey D.; Lawrence, Andrew (IOP Publishing, 1992)
The first X-ray spectrum of a high-redshift (z = 2.85) quasar is reported. The Rosat PSPC spectrum of PKS 0438-436, covering 0.3-9 keV in the quasar's rest frame, reveals unexpected absorption of about 1 x 10 exp 22/sq cm, ...
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The ROSAT spectrum of 3C 351 - A warm absorber in an X-ray-'quiet' quasar? 

Fiore, Fabrizio; Elvis, Martin S.; Mathur, Smita; Wilkes, Belinda Jane; McDowell, Jonathan Christopher (IOP Publishing, 1993)
3C 351 is one of the most X-ray-quiet radio quasars (alpha(ox) about 1.6). We have observed 3C 351 with the ROSAT position sensitive proportional counter (PSPC) and find a complex X-ray spectrum which is not well reproduced ...
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Atlas of quasar energy distributions 

Elvis, Martin S.; Wilkes, Belinda Jane; McDowell, Jonathan Christopher; Green, Richard F.; Bechtold, Jill; Willner, Steven P.; Oey, M. S.; Polomski, Elisha; Cutri, Roc (IOP Publishing, 1994)
We present an atlas of the spectral energy distributions (SEDs) of normal, nonblazar, quasars over the whole available range (radio to 10 keV X-rays) of the electromagnetic spectrum. The primary (UVSX) sample includes 47 ...
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X-ray absorption toward the red quasar 3C 212 

Elvis, Martin S.; Fiore, Fabrizio; Mathur, Smita; Wilkes, Belinda Jane (IOP Publishing, 1994)
A Roentgen Satellite (ROSAT) X-ray spectrum of the z = 1.049 'red quasar' 3C 212 has a strong low-energy cutoff. The spectrum can be fitted with a power law (of energy index 1.4(+0.8, -0.6) with low-energy photoelectric ...
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EXOSAT X-ray spectra of quasars 

Comastri, Andrea; Setti, Giancarlo; Zamorani, Giovanni; Elvis, Martin; Wilkes, Belinda Jane; McDowell, Jonathan Christopher; Giommi, Paolo (IOP Publishing, 1992)
Measurements of the X-ray spectra in the 0.1-10-keV energy range for 17 AGN (mostly PG quasars) using the Exosat Low and Medium Energy arrays are presented. For each object, the best-fit spectral parameters in the medium-energy ...
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  • Wilkes, Belinda (14)
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Keyword
  • Quasars$:$ (14)
  • X Ray Spectra (9)
  • Rosat Mission (8)
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  • X Ray Astronomy (6)
  • Active Galactic Nuclei (5)
  • Spectral Energy Distribution (5)
  • Absorption Spectra (4)
  • Lyman Alpha Radiation (4)
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FAS Department
  • Astronomy (14)
Date Issued
  • 1994 (8)
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