Zobrazeno 1 - 10 of 86 pro vyhledávání: '"J. C. Houck"'
1
The 3 Ms Chandra campaign on Sgr A*: a census of X-ray flaring activity from the Galactic center
Autor: Daryl Haggard, Frederick K. Baganoff, Sera Markoff, Nathalie Degenaar, Rudy Wijnands, John A. Tomsick, Q. D. Wang, J. C. Houck, Charles F. Gammie, P. C. Fragile, J. Neilsen, Nicolas Grosso, Delphine Porquet, Jason Dexter, Sergei Nayakshin, Michael A. Nowak, Jon M. Miller
Publikováno v: Proceedings of the International Astronomical Union, 9(S303), 374-378. Cambridge University Press
Proceedings of the International Astronomical Union
Proceedings of the International Astronomical Union, Cambridge University Press (CUP), 2013, 9 (S303), pp.374-378. ⟨10.1017/S1743921314000945⟩
Over the last decade, X-ray observations of Sgr A* have revealed a black hole in a deep sleep, punctuated roughly once per day by brief flares. The extreme X-ray faintness of this supermassive black hole has been a long-standing puzzle in black hole
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4bbe9d676192d4064e0bdfb518ba766
https://doi.org/10.1017/s1743921314000945
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2
THE THREE-DIMENSIONAL STRUCTURE OF CASSIOPEIA A
Autor: J. D. T. Smith, John E. Davis, J. C. Houck, Haley Louise Gomez, Karl Isensee, M. D. Stage, Takashi Kozasa, Tracey DeLaney, Glenn E. Allen, William T. Reach, Jeonghee Rho, Lawrence Rudnick
Publikováno v: The Astrophysical Journal. 725:2038-2058
We used the Spitzer Space Telescope's Infrared Spectrograph to map nearly the entire extent of Cassiopeia A between 5-40 micron. Using infrared and Chandra X-ray Doppler velocity measurements, along with the locations of optical ejecta beyond the for
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f6e8a73bac8f6ac01df4d30ae287c73
https://doi.org/10.1088/0004-637x/725/2/2038
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4
A primary pressure standard at 100 kPa
Autor: Walter J. Bowers, Charles D. Ehrlich, Yueqin Cen, James W. Schmidt, J. C. Houck, Robert G. Driver, S A. Tison
Publikováno v: Metrologia. 36:525-529
Primary pressure standards in the atmospheric pressure range are often established using mercury manometers. To a lesser extent, controlled-clearance dead-weight testers, in which one component (normally the piston) has been dimensionally measured, h
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7aadc72b7b6a12f210b11d05a0ae84e
https://doi.org/10.1088/0026-1394/36/6/8
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5
A CHANDRA /HETGS CENSUS OF X-RAY VARIABILITY FROM Sgr A* DURING 2012
Autor: J. Neilsen, M. A. Nowak, C. Gammie, J. Dexter, S. Markoff, D. Haggard, S. Nayakshin, Q. D. Wang, N. Grosso, D. Porquet, J. A. Tomsick, N. Degenaar, P. C. Fragile, J. C. Houck, R. Wijnands, J. M. Miller, F. K. Baganoff
Publikováno v: The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2013, 774 (1), pp.42. ⟨10.1088/0004-637X/774/1/42⟩
Astrophysical Journal, 774(1). IOP Publishing Ltd.
We present the first systematic analysis of the X-ray variability of Sgr A* during the Chandra X-ray Observatory's 2012 Sgr A* X-ray Visionary Project (XVP). With 38 High Energy Transmission Grating Spectrometer (HETGS) observations spaced an average
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4f0570e27ba6b89a2e6d58fd7d6b1c1
https://hal.archives-ouvertes.fr/hal-02326976
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6
Dissecting x-ray-emitting gas around the center of our galaxy
Autor: Nicolas Grosso, Roman V. Shcherbakov, Daryl Haggard, Q. D. Wang, L. Ji, Michael A. Nowak, Sera Markoff, Feng Yuan, J. C. Davis, Zheng Li, Jorge Cuadra, Sergei Nayakshin, F. Ripple, Jason Dexter, A. C. Fabian, J. C. Houck, Joseph Neilsen, Frederick K. Baganoff, D. Porquet
Publikováno v: SCIENCE
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Science, 341(6149), 981-983. American Association for the Advancement of Science
Science
Science, American Association for the Advancement of Science, 2013, 341 (6149), pp.981-983. ⟨10.1126/science.1240755⟩
Most supermassive black holes (SMBHs) are accreting at very low levels and are difficult to distinguish from the galaxy centers where they reside. Our own Galaxy's SMBH provides a uniquely instructive exception, and we present a close-up view of its
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a104e57258cf14d1161e68a234f0c5c
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7
Chandra/HETGS Observations of the Brightest Flare Seen from Sgr A*
Autor: J. C. Houck, Sera Markoff, Heino Falcke, Yuri Levin, Frederick K. Baganoff, Andreas Eckart, Jon M. Miller, Joseph Neilsen, Delphine Porquet, Nicolas Grosso, Michael A. Nowak, L. Ji, Q. D. Wang
Publikováno v: Astrophysical Journal, 759(2). IOP Publishing Ltd.
The Astrophysical Journal, 759, 2, pp. 95(1)-95(9)
The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2012, 759 (2), pp.95. ⟨10.1088/0004-637X/759/2/95⟩
The Astrophysical Journal, 759, 95(1)-95(9)
Starting in 2012, we began an unprecedented observational program focused on the supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy Transmission Gratings Spectrometer (HETGS) instrument on the Chandra X-ray Observa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d29a40d26d7d5527d56bf8d2393a13ad
https://dare.uva.nl/personal/pure/en/publications/chandrahetgs-observations-of-the-brightest-flare-seen-from-sgr-a(76638bb9-2016-4cac-8927-c18f6e536a03).html
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8
Cosmic ray diffusion near the Bohm limit in the Cassiopeia A supernova remnant
Autor: J. C. Houck, M. D. Stage, John E. Davis, Glenn E. Allen
Supernova remnants (SNRs) are believed to be the primary location of the acceleration of Galactic cosmic rays, via diffusive shock (Fermi) acceleration. Despite considerable theoretical work the precise details are still unknown, in part because of t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1e116593c9df25bde6905b3c3a98f22a
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9
An intercomparison between NPL (India) and NIST (USA) pressure standards in the hydraulic pressure region up to 26 Mpa
Autor: D. B. Ward, J. K. N. Sharma, J. C. Houck, K. K. Jain, C. D. Ehrlich
Publikováno v: Journal of Research of the National Institute of Standards and Technology. 99:725
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 Results are presented of an intercomparison of pressure measurements between the National Physical Laboratory (NPL), India, and the National Institute of Standards and Techno
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d3c4a5a3636476b4cd7be3afc7c1cc48
https://doi.org/10.6028/jres.099.064
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10
The biochemistry of lymphocyte-derived mediators of immunological inflammation
Autor: J. C. Houck, K. B. Hellman, C. M. Chang
Publikováno v: Agents and Actions. 8:73-79
Evidence is presented to indicate that there exists in lymphoid tissue, as a result of transforming lymphocytes, a new lymphokine which is chemotactically specific for lymphocytes, called 'lymphotactin'. Lymphotactin has been purified to electrophore
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b53889e20bb72e82183ac5691339d79
https://doi.org/10.1007/bf01972405
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