Zobrazeno 1 - 10
of 65
pro vyhledávání: '"E. M. Kellogg"'
Autor:
E. M. Kellogg, Joseph M. DePasquale, Kelly E. Korreck, Joy S. Nichols, Craig Anderson, J. L. Sokoloski, Miriam I. Krauss, J. A. Pedelty
Publikováno v:
The Astrophysical Journal. 664:1079-1087
Chandra and VLA observations of the symbiotic star R Aqr in 2004 reveal significant changes over the three to four year interval between these observations and previous observations taken with the VLA in 1999 and with Chandra in 2000. This paper repo
Publikováno v:
The Astrophysical Journal. 563:L151-L155
We report Chandra ACIS-S3 x-ray imaging and spectroscopy of the R Aquarii binary system that show a spatially resolved two-sided jet and an unresolved central source. This is the first published report of such an x-ray jet seen in an evolved stellar
Autor:
Brian David McNamara, Fabrizio Nicastro, Aneta Siemiginowska, Alexey Vikhlinin, E. J. Hooper, Harvey Tananbaum, Andrea Comastri, Eric M. Schlegel, Jelle Kaastra, D. E. Harris, Trevor J. Ponman, E. M. Kellogg, Douglas Burke, William R. Forman, Belinda Jane Wilkes, C. Jones, M. Cappi, Paul J. Green, Stephen S. Murray, Antonella Fruscione, Fabrizio Fiore, Pasquale Mazzotta, Martin Elvis, Shanil N. Virani
Publikováno v:
The Astrophysical Journal. 548:624-638
We present results from a Chandra X-ray Observatory study of the field X-ray source populations in 4 different observations: two high-redshift (z~0.5) clusters of galaxies 3C295 and RXJ003033.2+261819; and two non-cluster fields with similar exposure
Autor:
Joseph M. DePasquale, J. Nichols, Craig Anderson, Jeffrey A. Pedelty, Jennifer L. Sokoloski, E. M. Kellogg
Two Chandra observations of the R Aqr symbiotic binary system taken 3.3 years apart show dramatic changes in the X-ray morphology and spectral characteristics in the inner 500 AU of this system. The morphology of the soft X-ray emission has evolved f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74b4b1898c658d1d54b3fdce752dd4fd
The amount of mass loss in symbiotic systems is investigated, specifically mass loss via the formation of jets in R Aquarii (R Aqr). The jets in R Aqr have been observed in the X-ray by Chandra over a four year time period. The jet changes on times s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc25ceea7f387eeb023e2de25ce86921
http://arxiv.org/abs/astro-ph/0611401
http://arxiv.org/abs/astro-ph/0611401
Collimated outflows from accreting white dwarfs have an important role to play in the study of astrophysical jets. Observationally, collimated outflows are associated with systems in which material is accreted though a disk. Theoretically, accretion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c428933dfe66fe306402f037c4fcd88a
Autor:
Laurence P. David, Jeffery J. Kolodziejczak, D. Jerius, Michael Juda, Paul P. Plucinsky, Scott J. Wolk, Leon P. Van Speybroeck, Ronald F. Elsner, Herman L. Marshall, Douglas A. Swartz, Brian R. McNamara, Norbert S. Schulz, Terrance J. Gaetz, Ping Zhao, Daniel Dewey, Allyn F. Tennant, Bradford J. Wargelin, R. H. Donnelly, Daniel A. Schwartz, Stephen L. O'Dell, Richard J. Edgar, Dale E. Graessle, E. M. Kellogg, Martin C. Weisskopf
Publikováno v:
SPIE Proceedings.
The Chandra X-ray Observatory was launched in July 1999, and is returning exquisite sub-arcsecond x-ray images of star groups, supernova remnants, galaxies, quasars, and clusters of galaxies. In addition to being the premier X-ray observatory in term
Autor:
William R. Forman, J. Vrtilek, Paul Nulsen, Maxim Markevitch, A. Pagliaro, D. S. Davis, Michael W. Wise, Jelle Kaastra, Pasquale Mazzotta, Jeffrey Kolodziejczak, Douglas Burke, L. VanSpeybroeck, Trevor J. Ponman, Dong-Woo Kim, Shannon G. Patel, E. M. Kellogg, C. Jones, L. P. David, Alexey Vikhlinin, Ping Zhao, R. H. Donnelly, Mark W. Bautz
Publikováno v:
Scopus-Elsevier
We use Chandra data to map the gas temperature in the central region of the merging cluster A2142. The cluster is markedly nonisothermal; it appears that the central cooling flow has been disturbed but not destroyed by a merger. The X-ray image exhib
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::017fc64a25a515e8bc6cef5ee49845d4
http://arxiv.org/abs/astro-ph/0001269
http://arxiv.org/abs/astro-ph/0001269
Publikováno v:
Space Telescopes and Instruments V.
As part of the extensive ground testing of the AXAF, x-ray detectors of standard design were used as secondary absolute calibrators. In order to realize the overall facility calibration goal, these detectors need to be calibrated in turn on a primary
Autor:
E. M. Kellogg, Jonathan W. Arenberg, Frank Scholze, Richard J. Edgar, Ian Evans, Gerhard Ulm, Allyn F. Tennant, Martin C. Weisskopf, Mark W. Bautz, Daniel A. Schwartz, John A. Nousek, Ronald F. Elsner, Gordon P. Garmire, Stephen S. Murray, Jeffery J. Kolodziejczak, Phillip J. McKinnon, Stephen L. O'Dell, William A. Podgorski, Terrance J. Gaetz, Daniel Dewey, Martin V. Zombeck, Mark D. Freeman, Bradford J. Wargelin, Scott C. Texter, R. Carlson, D. Jerius, Walter C. McDermott, Kathryn A. Flanagan, Leon P. Van Speybroeck, Stefan Kraft, L. Cohen, Reiner Thornagel
Publikováno v:
Grazing Incidence and Multilayer X-Ray Optical Systems.
The prelaunch calibration of AXAF encompasses many aspects of the telescope. In principle, all that is needed is the complete point response function. This is, however, a function of energy, off-axis angle of the source, and operating mode of the fac