Search Results - "Greenhill, Lincoln"

Prevalence of High X-Ray Obscuring Columns among AGNs that Host H2O Masers by Greenhill, Lincoln J, Tilak, Avanti, Madejski, Grzegorz

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An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750 by Zaw, Ingyin, Rosenthal, Michael J., Katkov, Ivan Yu, Gelfand, Joseph D., Chen, Yan-Ping, Greenhill, Lincoln J., Brisken, Walter, Noori, Hind Al

“…We present a multiwavelength study of the active galactic nucleus in the nearby (D = 14.1 Mpc) low-mass galaxy IC 750, which has circumnuclear 22 GHz water…”
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A Simultaneous Search for Prompt Radio Emission Associated with the Short GRB 170112A Using the All-sky Imaging Capability of the OVRO-LWA by Anderson, Marin M., Hallinan, Gregg, Eastwood, Michael W., Monroe, Ryan M., Vedantham, Harish K., Bourke, Stephen, Greenhill, Lincoln J., Kocz, Jonathon, W. Lazio, T. Joseph, Price, Danny C., Schinzel, Frank K., Wang, Yuankun, Woody, David P.

“…We have conducted the most sensitive low-frequency (below 100 MHz) search to date for prompt, low-frequency radio emission associated with short-duration…”
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Measuring Noise Parameters Using an Open, Short, Load, and λ/8-Length Cable as Source Impedances by Price, Danny C., Tong, Cheuk-Yu Edward, Sutinjo, Adrian T., Greenhill, Lincoln J., Patra, Nipanjana

“…Noise parameters are a set of four measurable quantities which determine the noise performance of a radio frequency device under test (DUT). The noise…”
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Imaging Spectroscopy of CME-associated Solar Radio Bursts using OVRO-LWA by Chhabra, Sherry, Gary, Dale E., Hallinan, Gregg, Anderson, Marin M., Chen, Bin, Greenhill, Lincoln J., Price, Danny C.

“…We present the first results of a solar radio event observed with the Owens Valley Radio Observatory Long Wavelength Array at metric wavelengths. We examine a…”
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Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers by Zhu, Guangtun, Zaw, Ingyin, Blanton, Michael R, Greenhill, Lincoln J

“…We study the optical properties of the host galaxies of nuclear 22 GHz ( Delta *l = 1.35 cm) water masers. To do so, we cross-match the galaxy sample surveyed…”
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The Parsec-Scale Accretion Disk in NGC 3393 by Kondratko, Paul T, Greenhill, Lincoln J, Moran, James M

“…We present a Very Long Baseline Interferometry image of the water maser emission in the nuclear region of NGC 3393. The maser emission has a linear…”
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Evidence for a Geometrically Thick Self-Gravitating Accretion Disk in NGC 3079 by Kondratko, Paul T, Greenhill, Lincoln J, Moran, James M

“…We have mapped, for the first time, the full velocity extent of the water maser emission in NGC 3079. The largely north-south distribution of emission, aligned…”
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Geometric Distance and Proper Motion of the Triangulum Galaxy (M33) by Brunthaler, Andreas, Reid, Mark J, Falcke, Heino, Greenhill, Lincoln J, Henkel, Christian

“…We measured the angular rotation and proper motion of the Triangulum Galaxy (M33) with the Very Long Baseline Array by observing two H₂O masers on opposite…”
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Discovery of Candidate H2O Disk Masers in Active Galactic Nuclei and Estimations Of Centripetal Accelerations by Greenhill, Lincoln J, Kondratko, Paul T, Moran, James M, Tilak, Avanti

“…Based on spectroscopic signatures, about one-third of known H2O maser sources in active galactic nuclei (AGNs) are believed to arise in highly inclined…”
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Discovery of Water Maser Emission in Five AGNs and a Possible Correlation Between Water Maser and Nuclear 2-10 keV Luminosities by Kondratko, Paul T, Greenhill, Lincoln J, Moran, James M

“…We report the discovery of water maser emission in five active galactic nuclei (AGNs) with the 100 m Green Bank Telescope (GBT). The positions of the newly…”
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A GPU-based Real-time Software Correlation System for the Murchison Widefield Array Prototype by Wayth, Randall B., Greenhill, Lincoln J., Briggs, Frank H.

“…Modern graphics processing units (GPUs) are inexpensive commodity hardware that offer Tflop/s theoretical computing capacity. GPUs are well suited to many…”
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A Deep 0.3-10 keV Spectrum of the H2O Maser Galaxy IC 2560 by Tilak, Avanti, Greenhill, Lincoln J, Done, Chris, Madejski, Grzegorz

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A Deep 0.3-10 keV Spectrum of the H(2)O Maser Galaxy IC 2560 by Tilak, Avanti, Greenhill, Lincoln J, Done, Chris, Madejski, Grzegorz

“…We present a new XMM-Newton spectrum of the Seyfert 2 nucleus of IC 2560, which hosts H(2)O maser emission from an inclined Keplerian accretion disk. The X-ray…”
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A surprising chill before the cosmic dawn by Greenhill, Lincoln

“…An experiment to estimate when stars began to form in the Universe suggests that gas temperatures just before stars appeared had fallen well below predicted…”
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A digital-receiver for the MurchisonWidefield Array by Prabu, Thiagaraj, Srivani, K. S., Roshi, D. Anish, Kamini, P. A., Madhavi, S., Emrich, David, Crosse, Brian, Williams, Andrew J., Waterson, Mark, Deshpande, Avinash A., Shankar, N. Udaya, Subrahmanyan, Ravi, Briggs, Frank H., Goeke, Robert F., Tingay, Steven J., Johnston-Hollitt, Melanie, R, Gopalakrishna M, Morgan, Edward H., Pathikulangara, Joseph, Bunton, John D., Hampson, Grant, Williams, Christopher, Ord, Stephen M., Wayth, Randall B., Kumar, Deepak, Morales, Miguel F., deSouza, Ludi, Kratzenberg, Eric, Pallot, D., McWhirter, Russell, Hazelton, Bryna J., Arcus, Wayne, Barnes, David G., Bernardi, Gianni, Booler, T., Bowman, Judd D., Cappallo, Roger J., Corey, Brian E., Greenhill, Lincoln J., Herne, David, Hewitt, Jacqueline N., Kaplan, David L., Kasper, Justin C., Kincaid, Barton B., Koenig, Ronald, Lonsdale, Colin J., Lynch, Mervyn J., Mitchell, Daniel A., Oberoi, Divya, Remillard, Ronald A., Rogers, Alan E., Salah, Joseph E., Sault, Robert J., Stevens, Jamie B., Tremblay, S., Webster, Rachel L., Whitney, Alan R., Wyithe, Stuart B.

“…An FPGA-based digital-receiver has been developed for a low-frequency imaging radio interferometer, the Murchison Widefield Array (MWA). The MWA, located at…”
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Evidence for a black hole from high rotation velocities in a sub-parsec region of NGC4258 by Miyoshi, Makoto, Moran, James, Herrnstein, James, Greenhill, Lincoln, Nakai, Naomasa, Diamond, Philip, Inoue, Makoto

“…Observations of rotating gas near the center of the galaxy NGC4258 are discussed in a study, which indicate the presence of a mass of 3.6 times 10(7) solar…”
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Probing the Magnetic Field at Subparsec Radii in the Accretion Disk of NGC 4258 by Modjaz, Maryam, Moran, James M, Kondratko, Paul T, Greenhill, Lincoln J

“…We present an analysis of polarimetric observations at 22 GHz of the water vapor masers in NGC 4258 obtained with the VLA and the GBT. We do not detect any…”
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X-Ray Luminosity and Absorption Column Fluctuations in the H2O Maser Galaxy NGC 4258 from Weeks to Years by Fruscione, Antonella, Greenhill, Lincoln J, Filippenko, Alexei V, Moran, James M, Herrnstein, James R, Galle, Elizabeth

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Water Maser Emission and the Parsec-Scale Jet in NGC 3079 by Trotter, Adam S, Greenhill, Lincoln J, Moran, James M, Reid, Mark J, Irwin, Judith A, Lo, Kwok-Yung

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