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81 results on '"Kenter, Almus T."'

1. SSAXI-Rocket delta-doped CMOS sensors

Author

Holland, Andrew D., Minoglou, Kyriaki, Sánchez-Maes, Sophia A., Ho, Johnny, Anderson, Isaac, Aguirre-Contreras, Elias, Barcroft, Carl, Barstow, Juliana, Caldwell, David, D’Aquino, Brendan, Dubinsky, Gabriel, Gauron, Thomas M., Hong, Jaesub, Kenter, Almus T., Moore, Christopher S., Nere, Rachel, Pandohie, Ritesh, and Suarez, Crisel

Published
2024
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2. The Star Formation and Nuclear Accretion Histories of Normal Galaxies in the AGES Survey

Author

Watson, Casey R., Kochanek, Christopher S., Forman, William R., Hickox, Ryan C., Jones, Christine J., Brown, Michael J. I., Brand, Kate, Dey, Arjun, Jannuzi, Buell T., Kenter, Almus T., Murray, Steve S., Vikhlinin, Alexey, Eisenstein, Daniel J., Fazio, Giovani G., Green, Paul J., McNamara, Brian R., Rieke, Marcia, and Shields, Joseph C.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

We combine IR, optical and X-ray data from the overlapping, 9.3 square degree NOAO Deep Wide-Field Survey (NDWFS), AGN and Galaxy Evolution Survey (AGES), and XBootes Survey to measure the X-ray evolution of 6146 normal galaxies as a function of absolute optical luminosity, redshift, and spectral type over the largely unexplored redshift range 0.1 < z < 0.5. Because only the closest or brightest of the galaxies are individually detected in X-rays, we use a stacking analysis to determine the mean properties of the sample. Our results suggest that X-ray emission from spectroscopically late-type galaxies is dominated by star formation, while that from early-type galaxies is dominated by a combination of hot gas and AGN emission. We find that the mean star formation and supermassive black hole accretion rate densities evolve like (1+z)^3, in agreement with the trends found for samples of bright, individually detectable starburst galaxies and AGN. Our work also corroborates the results of many previous stacking analyses of faint source populations, with improved statistics., Comment: 19 pages, 15 figures, 3 tables, accepted for publication in ApJ

Published
2009
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3. The Chandra XBootes Survey - III: Optical and Near-IR Counterparts

Author

Brand, Kate, Brown, Michael J. I., Dey, Arjun, Jannuzi, Buell T., Kochanek, Christopher S., Kenter, Almus T., Fabricant, Daniel, Fazio, Giovanni G., Forman, William R., Green, Paul J., Jones, Christine J., McNamara, Brian R., Murray, Stephen S., Najita, Joan R., Rieke, Marcia, Shields, Joseph C., and Vikhlinin, Alexey

Subjects
Astrophysics
Abstract

The XBootes Survey is a 5-ks Chandra survey of the Bootes Field of the NOAO Deep Wide-Field Survey (NDWFS). This survey is unique in that it is the largest (9.3 deg^2), contiguous region imaged in X-ray with complementary deep optical and near-IR observations. We present a catalog of the optical counterparts to the 3,213 X-ray point sources detected in the XBootes survey. Using a Bayesian identification scheme, we successfully identified optical counterparts for 98% of the X-ray point sources. The optical colors suggest that the optically detected galaxies are a combination of z<1 massive early-type galaxies and bluer star-forming galaxies whose optical AGN emission is faint or obscured, whereas the majority of the optically detected point sources are likely quasars over a large redshift range. Our large area, X-ray bright, optically deep survey enables us to select a large sub-sample of sources (773) with high X-ray to optical flux ratios (f_x/f_o>10). These objects are likely high redshift and/or dust obscured AGN. These sources have generally harder X-ray spectra than sources with 0.1

Published
2005
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4. Tracing the Nuclear Accretion History of the Red Galaxy Population

Author

Brand, Kate, Dey, Arjun, Brown, Michael J. I., Watson, Casey R., Jannuzi, Buell T., Najita, Joan R., Kochanek, Christopher S., Shields, Joseph C., Fazio, Giovani G., Forman, William R., Green, Paul J., Jones, Christine J., Kenter, Almus T., McNamara, Brian R., Murray, Steve S., Rieke, Marcia, and Vikhlinin, Alexey

Subjects
Astrophysics
Abstract

We investigate the evolution of the hard X-ray luminosity of the red galaxy population using a large sample of 3316 red galaxies selected over a wide range in redshift (0.3

Published
2005
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5. SmallSat solar axion and activity x-ray imager (SSAXI)

Author

Massachusetts Institute of Technology. Department of Physics, Hong, JaeSub E, Romaine, Suzanne, Kenter, Almus T, Moore, Christopher S, Reeves, Katharine, Ramsey, Brian D, Kilaru, Kiranmayee, Vogel, Julia K, Ruz Armendariz, Jaime, Hudson, Hugh H, Perez, Kerstin M., Massachusetts Institute of Technology. Department of Physics, Hong, JaeSub E, Romaine, Suzanne, Kenter, Almus T, Moore, Christopher S, Reeves, Katharine, Ramsey, Brian D, Kilaru, Kiranmayee, Vogel, Julia K, Ruz Armendariz, Jaime, Hudson, Hugh H, and Perez, Kerstin M.

Abstract

© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. Axion is a promising dark matter candidate as well as a solution to the strong charge-parity (CP) problem in quantum chromodynamics (QCD). We describe a new concept for SmallSat Solar Axion and Activity X-ray Telescope (SSAXI) to search for solar axions or axion-like particles (ALPs) and to monitor solar activity over a wide dynamic range. SSAXI aims to unambiguously identify X-rays converted from axions in the solar magnetic field along the line of sight to the solar core, effectively imaging the solar core. SSAXI employs Miniature lightweight Wolter-I focusing X-ray optics (MiXO) and monolithic CMOS X-ray sensors in a compact package. The wide energy range (0.5-5 keV) of SSAXI can easily distinguish spectra of axion-converted X-rays from solar X-ray spectra, while encompassing the prime energy band (3-4.5 keV) of axion-converted X-rays. The high angular resolution (30 arcsec) and large field of view (40 arcmin) in SSAXI will easily resolve the enhanced X-ray flux over the 3 arcmin wide solar core while fully covering the X-ray activity over the entire solar disc. The fast readout in the inherently radiation tolerant CMOS X-ray sensors enables high resolution spectroscopy over a wide dynamic range with a broad range of operational temperatures. We present multiple mission implementation options for SSAXI under ESPA class. SSAXI will operate in a Sun-synchronous orbit for 1 yr preferably near a solar minimum to accumulate sufficient X-ray photon statistics.

Published
2022

6. SmallSat solar axion and activity x-ray imager (SSAXI)

Author

Hong, JaeSub E, Romaine, Suzanne, Kenter, Almus T, Moore, Christopher S, Reeves, Katharine, Ramsey, Brian D, Kilaru, Kiranmayee, Vogel, Julia K, Ruz Armendariz, Jaime, Hudson, Hugh H, Perez, Kerstin, Hong, JaeSub E, Romaine, Suzanne, Kenter, Almus T, Moore, Christopher S, Reeves, Katharine, Ramsey, Brian D, Kilaru, Kiranmayee, Vogel, Julia K, Ruz Armendariz, Jaime, Hudson, Hugh H, and Perez, Kerstin

Abstract

© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. Axion is a promising dark matter candidate as well as a solution to the strong charge-parity (CP) problem in quantum chromodynamics (QCD). We describe a new concept for SmallSat Solar Axion and Activity X-ray Telescope (SSAXI) to search for solar axions or axion-like particles (ALPs) and to monitor solar activity over a wide dynamic range. SSAXI aims to unambiguously identify X-rays converted from axions in the solar magnetic field along the line of sight to the solar core, effectively imaging the solar core. SSAXI employs Miniature lightweight Wolter-I focusing X-ray optics (MiXO) and monolithic CMOS X-ray sensors in a compact package. The wide energy range (0.5-5 keV) of SSAXI can easily distinguish spectra of axion-converted X-rays from solar X-ray spectra, while encompassing the prime energy band (3-4.5 keV) of axion-converted X-rays. The high angular resolution (30 arcsec) and large field of view (40 arcmin) in SSAXI will easily resolve the enhanced X-ray flux over the 3 arcmin wide solar core while fully covering the X-ray activity over the entire solar disc. The fast readout in the inherently radiation tolerant CMOS X-ray sensors enables high resolution spectroscopy over a wide dynamic range with a broad range of operational temperatures. We present multiple mission implementation options for SSAXI under ESPA class. SSAXI will operate in a Sun-synchronous orbit for 1 yr preferably near a solar minimum to accumulate sufficient X-ray photon statistics.

Published
2021

7. Goals of the Swift Solar Activity X-ray Imager (SSAXI-Rocket) rocket experiment

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Moore, Christopher S., Hong, Jae Sub, Ho, Johnny, Sánchez-Maes, Sophia A., Aguirre-Contreras, Elias, Anderson, Isaac, Barcroft, Carl, Barstow, Juliana, Bruni, Ricardo, Caldwell, David, D'Aquino, Brendan, Dubinsky, Gabriel, Gauron, Thomas M., Golub, Leon, Hayes, Laura A., Hertz, Ed, Inglis, Andrew R., Kenter, Almus T., Kobelski, Adam, Nere, Rachel, Pandohie, Ritesh, Reep, Jeffrey W., Romaine, Suzanne, Savage, Sabrina, Suarez, Crisel, Svec, Zachary, Theroux, David, Thomas, Nicholas, and Winebarger, Amy

Published
2024
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8. SmallSat solar axion and activity x-ray imager (SSAXI)

Author

Hong, JaeSub E., primary, Romaine, Suzanne, additional, Kenter, Almus T., additional, Moore, Christopher S., additional, Reeves, Katharine, additional, Ramsey, Brian D., additional, Kilaru, Kiranmayee, additional, Vogel, Julia K., additional, Ruz Armendariz, Jaime, additional, Hudson, Hugh H., additional, and Perez, Kerstin, additional

Published
2019
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9. SEEJ: SmallSat Exosphere Explorer of Hot Jupiters

Author

Wolk, Scott J., primary, Hong, JaeSub E., additional, Romaine, Suzanne, additional, Poppenhaeger, Katja, additional, Kenter, Almus T., additional, Moorhead, Althea V., additional, Gallagher, Dennis L., additional, Moore, Christopher S., additional, Elvis, Martin E., additional, Kraft, Ralph, additional, Drake, Jeremy J., additional, Kashyap, Vinay L., additional, Winston, Elaine M., additional, Wargelin, Bradford, additional, Pillitteri, Ignazio, additional, Jerius, Diab, additional, Stahl, Mark T., additional, Wiegmann, Bruce M., additional, and Loghry, Christopher, additional

Published
2019
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11. Fractal multifiber microchannel plates

Author

Cook, Lee M, Feller, W. B, Kenter, Almus T, and Chappell, Jon H

Subjects
Instrumentation And Photography
Abstract

The construction and performance of microchannel plates (MCPs) made using fractal tiling mehtods are reviewed. MCPs with 40 mm active areas having near-perfect channel ordering were produced. These plates demonstrated electrical performance characteristics equivalent to conventionally constructed MCPs. These apparently are the first MCPs which have a sufficiently high degree of order to permit single channel addressability. Potential applications for these devices and the prospects for further development are discussed.

Published
1992

15. THE STAR FORMATION AND NUCLEAR ACCRETION HISTORIES OF NORMAL GALAXIES IN THE AGES SURVEY

Author

Watson, Casey R., primary, Kochanek, Christopher S., additional, Forman, William R., additional, Hickox, Ryan C., additional, Jones, Christine J., additional, Brown, Michael J. I., additional, Brand, Kate, additional, Dey, Arjun, additional, Jannuzi, Buell T., additional, Kenter, Almus T., additional, Murray, Steve S., additional, Vikhlinin, Alexey, additional, Eisenstein, Daniel J., additional, Fazio, Giovani G., additional, Green, Paul J., additional, McNamara, Brian R., additional, Rieke, Marcia, additional, and Shields, Joseph C., additional

Published
2009
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16. TheChandraXBootes Survey. III. Optical and Near‐Infrared Counterparts

Author

Brand, Kate, primary, Brown, Michael J. I., additional, Dey, Arjun, additional, Jannuzi, Buell T., additional, Kochanek, Christopher S., additional, Kenter, Almus T., additional, Fabricant, Daniel, additional, Fazio, Giovanni G., additional, Forman, William R., additional, Green, Paul J., additional, Jones, Christine J., additional, McNamara, Brian R., additional, Murray, Stephen S., additional, Najita, Joan R., additional, Rieke, Marcia, additional, Shields, Joseph C., additional, and Vikhlinin, Alexey, additional

Published
2006
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17. Tracing the Nuclear Accretion History of the Red Galaxy Population

Author

Brand, Kate, primary, Dey, Arjun, additional, Brown, Michael J. I., additional, Watson, Casey R., additional, Jannuzi, Buell T., additional, Najita, Joan R., additional, Kochanek, Christopher S., additional, Shields, Joseph C., additional, Fazio, Giovanni G., additional, Forman, William R., additional, Green, Paul J., additional, Jones, Christine J., additional, Kenter, Almus T., additional, McNamara, Brian R., additional, Murray, Steve S., additional, Rieke, Marcia, additional, and Vikhlinin, Alexey, additional

Published
2005
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21. In-flight performance and calibration of the Chandra high-resolution camera spectroscopic readout (HRC-S).

Author

Kraft, Ralph P., Chappell, John H., Kenter, Almus T., Meehan, Gary R., Murray, Stephen S., Zombeck, Martin V., Donnelly, R. H., Drake, Jeremy J., Johnson, C. Olivia, Juda, Michael, Patnaude, Daniel, Pease, Deron O., Ratzlaff, Peter W., Wargelin, Bradford J., Zhao, Ping, Austin, Gerald K., Fraser, George W., Pearson, James F., Lees, John E., and Brunton, Adam N.

Published
2000
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23. Description and performance of the low-energy transmission grating spectrometer on board Chandra.

Author

Brinkman, A. C., Gunsing, Theo, Kaastra, Jelle S., van der Meer, Rob, Mewe, Rolf, Paerels, Frits B. S., Raassen, Ton, van Rooijen, Jan, Braeuninger, Heinrich W., Burwitz, Vadim, Hartner, Gisela D., Kettenring, Guenther, Predehl, Peter, Drake, Jeremy J., Johnson, C. Olivia, Kenter, Almus T., Kraft, Ralph P., Murray, Stephen S., Ratzlaff, Peter W., and Wargelin, Bradford J.

Published
2000
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28. In-flight performance of the Chandra high-resolution camera

Author

Murray, Stephen S., primary, Austin, Gerald K., additional, Chappell, John H., additional, Gomes, Joaquim J., additional, Kenter, Almus T., additional, Kraft, Ralph P., additional, Meehan, Gary R., additional, Zombeck, Martin V., additional, Fraser, George W., additional, and Serio, Salvatore, additional

Published
2000
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29. In-flight performance and calibration of the Chandra high-resolution camera spectroscopic readout (HRC-S)

Author

Kraft, Ralph P., primary, Chappell, John H., additional, Kenter, Almus T., additional, Meehan, Gary R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Donnelly, R. H., additional, Drake, Jeremy J., additional, Johnson, C. Olivia, additional, Juda, Michael, additional, Patnaude, Daniel, additional, Pease, Deron O., additional, Ratzlaff, Peter W., additional, Wargelin, Bradford J., additional, Zhao, Ping, additional, Austin, Gerald K., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, Barbera, Marco, additional, Collura, Alfonso, additional, and Serio, Salvatore, additional

Published
2000
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30. In-flight performance and calibration of the Chandra high-resolution camera imager (HRC-I)

Author

Kenter, Almus T., primary, Chappell, John H., additional, Kraft, Ralph P., additional, Meehan, Gary R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Hole, K. T., additional, Juda, Michael, additional, Donnelly, R. H., additional, Patnaude, Daniel, additional, Pease, Deron O., additional, Wilton, Charles R., additional, Zhao, Ping, additional, Austin, Gerald K., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, Barbera, Marco, additional, Collura, Alfonso, additional, and Serio, Salvatore, additional

Published
2000
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32. X-ray optics made from thin plastic foils

Author

Schnopper, Herbert W., primary, Silver, Eric H., additional, Ingram, Russell H., additional, Christensen, Finn E., additional, Hussain, Ahsen M., additional, Barbera, Marco, additional, Romaine, Suzanne E., additional, Collura, Alfonso, additional, Kenter, Almus T., additional, Bandler, Simon R., additional, and Murray, Stephen S., additional

Published
1999
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33. Effective area of the AXAF high-resolution camera (HRC)

Author

Patnaude, Daniel, primary, Pease, Deron O., additional, Donnelly, R. H., additional, Juda, Michael, additional, Jones, Christine, additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Kraft, Ralph P., additional, Kenter, Almus T., additional, Meehan, Gary R., additional, Elsner, Ronald F., additional, and Swartz, Douglas A., additional

Published
1998
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36. Performance and calibration of the AXAF High-Resolution Camera I: imaging readout

Author

Kenter, Almus T., primary, Chappell, John H., additional, Kobayashi, K., additional, Kraft, Ralph P., additional, Meehan, G. R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, Pearce, Sarah E., additional, Barbera, Marco, additional, Collura, Alfonso, additional, and Serio, Salvatore, additional

Published
1997
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38. AXAF High-Resolution Camera (HRC): calibration and recalibration at XRCF and beyond

Author

Murray, Stephen S., primary, Chappell, John H., additional, Kenter, Almus T., additional, Kobayashi, K., additional, Kraft, Ralph P., additional, Meehan, G. R., additional, Zombeck, Martin V., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, Pearce, Sarah E., additional, Barbera, Marco, additional, Collura, Alfonso, additional, and Serio, Salvatore, additional

Published
1997
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39. Performance and calibration of the AXAF High-Resolution Camera II: the spectroscopic detector

Author

Kraft, Ralph P., primary, Chappell, John H., additional, Kenter, Almus T., additional, Kobayashi, K., additional, Meehan, G. R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, Barbera, Marco, additional, Collura, Alfonso, additional, and Serio, Salvatore, additional

Published
1997
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40. Absolute quantum efficiency calibration of the AXAF High-Resolution Camera

Author

Kraft, Ralph P., primary, Chappell, John H., additional, Kenter, Almus T., additional, Kobayashi, K., additional, Meehan, G. R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, Fraser, George W., additional, Pearson, James F., additional, Lees, John E., additional, Brunton, Adam N., additional, and Pearce, Sarah E., additional

Published
1996
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41. High-Resolution Camera on AXAF

Author

Kenter, Almus T., primary, Chappell, John H., additional, Kraft, Ralph P., additional, Meehan, G. R., additional, Murray, Stephen S., additional, Zombeck, Martin V., additional, and Fraser, George W., additional

Published
1996
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43. Lobster-eye x-ray telescope prototype

Author

Gorenstein, Paul, primary, Whitbeck, Elizabeth, additional, Austin, Gerald K., additional, Kenter, Almus T., additional, Pina, Ladislav, additional, Inneman, Adolf V., additional, and Hudec, Rene, additional

Published
1996
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48. MCP readout for the AXAF-I grating spectrometer

Author

Kenter, Almus T., primary, Goddard, Richard E., additional, Gomes, Joaquim J., additional, Lessing, Joshua, additional, Murray, Stephen S., additional, Moore, Randall W., additional, Roll, Rachel K., additional, Valenza, M., additional, and Zombeck, Martin V., additional

Published
1993
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