D. M. Crenshaw
Goddard Space Flight Center
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Publication
Featured researches published by D. M. Crenshaw.
web science | 1996
R. Edelson; T. Alexander; D. M. Crenshaw; Shai Kaspi; M. Malkan; Bradley M. Peterson; R. S. Warwick; J. Clavel; A. V. Filippenko; K. Horne; Kirk T. Korista; Gerard A. Kriss; Julian H. Krolik; D. Maoz; K. Nandra; Paul T. O'Brien; Steven V. Penton; T Yaqoob; P. Albrecht; Danielle Alloin; Thomas R. Ayres; Tj Balonek; P. Barr; Aaron J. Barth; R. Bertram; Ge Bromage; Michael T. Carini; Te Carone; Fz Cheng; K. K. Chuvaev
This paper combines data from the three preceding papers in order to analyze the multi-waveband variability and spectral energy distribution of the Seyfert~1 galaxy NGC~4151 during the December 1993 monitoring campaign. The source, which was near its peak historical brightness, showed strong, correlated variability at X-ray, ultraviolet, and optical wavelengths. The strongest variations were seen in medium energy (
Astrophysical Journal Supplement Series | 1997
Ignaz Wanders; Bradley M. Peterson; Danielle Alloin; Thomas R. Ayres; J. Clavel; D. M. Crenshaw; K. Horne; Gerard A. Kriss; Julian H. Krolik; M. Malkan; Hagai Netzer; Paul T. O'Brien; Pm RodriguezPascual; Willem Wamsteker; T. Alexander; Ksj Anderson; E. Benítez; N. G. Bochkarev; A. N. Burenkov; F.-Z. Cheng; Sj Collier; A. Comastri; M. Dietrich; D. Dultzin-Hacyan; Brian R. Espey; A. V. Filippenko; C. M. Gaskell; I. M. George; Mike R. Goad; Luis C. Ho
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The Astrophysical Journal | 1994
G. A. Reichert; P. M. Rodriquez-Pascual; D. Alloin; J. Clavel; D. M. Crenshaw; Gerard A. Kriss; Julian H. Krolik; M. Malkan; Hagai Netzer; Bradley M. Peterson; Willem Wamsteker; A. Altamore; B. Altieri; Ksj Anderson; J. H. Blackwell; C. Boisson; Noah Brosch; T. E. Carone; M. Dietrich; M. N. England; I. N. Evans; A. V. Filippenko; C. M. Gaskell; M. R. Goad; P. M. Gondhalekar; K. Horne; D. Kazanas; W. Kollatschny; Anuradha Purushottam Koratkar; Kirk T. Korista
1.5~keV) X-rays, with a normalized variability amplitude (NVA) of 24%. Weaker (NVA = 6%) variations (uncorrelated with those at lower energies) were seen at soft
Astrophysical Journal Supplement Series | 1997
Pm RodriguezPascual; Danielle Alloin; J. Clavel; D. M. Crenshaw; K. Horne; Gerard A. Kriss; Julian H. Krolik; M. Malkan; Hagai Netzer; Paul T. O'Brien; Bradley M. Peterson; Willem Wamsteker; T. Alexander; P. Barr; R. D. Blandford; Joel N. Bregman; T. E. Carone; S. Clements; Thierry J.-L. Courvoisier; M. M. De Robertis; M. Dietrich; Horacio Alberto Dottori; R. Edelson; A. V. Filippenko; C. M. Gaskell; John P. Huchra; J. B. Hutchings; W. Kollatschny; Anuradha Purushottam Koratkar; Kirk T. Korista
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The Astronomical Journal | 2000
D. M. Crenshaw; Steven B. Kraemer; J. B. Hutchings; L. Bradley; T. R. Gull; Mary Elizabeth Kaiser; Charles H. Nelson; J. R. Ruiz; Donna E. Weistrop
-ray energies of
The Astrophysical Journal | 1998
Paul T. O'Brien; M. Dietrich; Karen M. Leighly; Danielle Alloin; J. Clavel; D. M. Crenshaw; K. Horne; Gerard A. Kriss; Julian H. Krolik; M. Malkan; Hagai Netzer; Bradley M. Peterson; Pm RodriguezPascual; Willem Wamsteker; Kurt S. Anderson; N. G. Bochkarev; F.-Z. Cheng; A. V. Filippenko; C. M. Gaskell; I. M. George; Mike R. Goad; Luis C. Ho; Shai Kaspi; W. Kollatschny; Kirk T. Korista; Gordon M. MacAlpine; D Marlow; P. G. Martin; Simon L. Morris; Richard W. Pogge
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The Astrophysical Journal | 2000
Steven B. Kraemer; D. M. Crenshaw; J. B. Hutchings; Theodore R. Gull; Mary Elizabeth Kaiser; Charles H. Nelson; Donna E. Weistrop
100~keV. No significant variability was seen in softer (0.1--1~keV) X-ray bands. In the ultraviolet/optical regime, the NVA decreased from 9% to 1% as the wavelength increased from 1275~AA to 6900~AA. These data do not probe extreme ultraviolet (1200~AA to 0.1~keV) or hard X-ray (2--50~keV) variability. The phase differences between variations in different bands were consistent with zero lag, with upper limits of
The Astrophysical Journal | 1997
Herman L. Marshall; T. E. Carone; Bradley M. Peterson; J. Clavel; D. M. Crenshaw; Kirk T. Korista; Gerard A. Kriss; Julian H. Krolik; M. Malkan; Simon L. Morris; Paul T. O'Brien; G. A. Reichert
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The Astrophysical Journal | 2000
Charles H. Nelson; Donna E. Weistrop; J. B. Hutchings; D. M. Crenshaw; T. R. Gull; Mary Elizabeth Kaiser; Steven B. Kraemer; D. J. Lindler
0.15~day between 1275~AA and the other ultraviolet bands,
The Astrophysical Journal | 2001
Stefan Collier; D. M. Crenshaw; Bradley M. Peterson; W. N. Brandt; J. Clavel; R. Edelson; I. M. George; K. Horne; Gerard A. Kriss; S. Mathur; Hagai Netzer; P. T. O’Brien; Richard W. Pogge; K. A. Pounds; Patrizia Romano; Ohad Shemmer; T. J. Turner; Willem Wamsteker
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