Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Frayer, David T."'
Autor:
Galaz, Gaspar, Frayer, David T., Blaña, Matias, Howk, J. Christopher, Puzia, Thomas, Johnston, Evelyn J., Ordenes-Briceño, Yasna, Church, Sarah, Gil, Santiago, Joachimi, Katerine, Mora, Marcelo
We report on results from GBT/ARGUS $^{12}$CO(1-0) observations for the giant low surface brightness galaxy Malin 1, which allow us to determine an upper limit for its CO mass, and hence its molecular gas mass and molecular gas mass surface density $
Externí odkaz:
http://arxiv.org/abs/2211.04342
Autor:
Linden, Sean T., Evans, Aaron S., Armus, Lee, Rich, Jeffrey A., Larson, Kirsten L., Lai, Thomas, Privon, George C., U, Vivian, Inami, Hanae, Bohn, Thomas, Song, Yiqing, Barcos-Muñoz, Loreto, Charmandaris, Vassilis, Medling, Anne M., Stierwalt, Sabrina, Diaz-Santos, Tanio, Böker, Torsten, van der Werf, Paul, Aalto, Susanne, Appleton, Philip, Brown, Michael J. I., Hayward, Christopher C., Howell, Justin H., Iwasawa, Kazushi, Kemper, Francisca, Frayer, David T., Law, David, Malkan, Matthew A., Marshall, Jason, Mazzarella, Joseph M., Murphy, Eric J., Sanders, David, Surace, Jason
We present the results of a {\it James Webb Space Telescope} NIRCam investigation into the young massive star cluster (YMC) population in the luminous infrared galaxy VV 114. We identify 374 compact YMC candidates with a $S/N \geq 3$, 5, and 5 at F15
Externí odkaz:
http://arxiv.org/abs/2210.05763
Autor:
Salas, Pedro, Marganian, Paul, Brandt, Joe, Seymour, Andrew, Shelton, John, Sharp, Nathan, Jensen, Laura, Bloss, Marty, Beaudet, Carla, Egan, Dennis, Sizemore, Nathaniel, Frayer, David T., Schwab, Frederic R., Lockman, Felix J.
Astronomical observations in the molecule rich 3 mm window using large reflector antennas provide a unique view of the Universe. To efficiently carry out these observations gravitational and thermal deformations have to be corrected. Terrestrial lase
Externí odkaz:
http://arxiv.org/abs/2203.04133
Autor:
Pineda, Jaime E., Schmiedeke, Anika, Caselli, Paola, Stahler, Steven W., Frayer, David T., Church, Sarah E., Harris, Andrew I.
Dense cores are the final place where turbulence is dissipated. It has been proposed from theoretical arguments that the non-thermal velocity dispersion should be narrower both for molecular ions (compared to neutrals) and for transitions with higher
Externí odkaz:
http://arxiv.org/abs/2104.12411
Autor:
Frayer, David T., Maddalena, Ronald J., White, Steven, Watts, Galen, Kepley, Amanda, Li, Jialu, Harris, Andrew I.
The calibration procedures for data collected for Argus and the 4mm Receiver instruments on the GBT are presented. The measured beam size, aperture efficiency, and main-beam efficiency are derived for the range of observing frequencies (66--116 GHz)
Externí odkaz:
http://arxiv.org/abs/1906.02307
Recent measurements at Q-band (43 GHz) have verified the improved performance of the GBT provided by the updated gravity model that was deployed in the fall of 2014. The measured gain curve is indistinguishable from 1.0 over an elevation range from 1
Externí odkaz:
http://arxiv.org/abs/1811.00105
Autor:
Frayer, David T., Maddalena, Ronald J., Ivison, R. J., Smail, Ian, Blain, Andrew W., Bout, Paul Vanden
We present CO(1-0), CO(3-2), and CO(7-6) observations using the Green Bank Telescope (GBT) and the Atacama Large Millimeter Array (ALMA) of the z=2.8 sub-millimeter galaxy SMM J02399-0136. This was the first submillimeter-selected galaxy discovered a
Externí odkaz:
http://arxiv.org/abs/1805.07212
Autor:
Frayer, David T.
The next generation Very Large Array project (ngVLA) would represent a major step forward in sensitivity and resolution for radio astronomy, with ability to achieve 2 milli-arcsec resolution at 100 GHz (assuming a maximum baseline of 300 km). For sci
Externí odkaz:
http://arxiv.org/abs/1706.02726
Autor:
Frayer, David T.
With the installation of the Argus 16-pixel receiver covering 75-115 GHz on the Green Bank Telescope (GBT), it is now possible to characterize the antenna beam at very high frequencies, where the use of the active surface and out-of-focus holography
Externí odkaz:
http://arxiv.org/abs/1704.00025
The National Science Foundation (NSF) Astronomy Division's Portfolio Review of 2012 is no longer relevant to the Green Bank Telescope (GBT) of 2017 for two principal reasons, one instrumental and the other astrophysical: 1) The GBT has begun signific
Externí odkaz:
http://arxiv.org/abs/1610.02329