Search Results - "Lacy, John H"

H2, CO, and Dust Absorption through Cold Molecular Clouds by Lacy, John H., Sneden, Christopher, Kim, Hwihyun, Jaffe, Daniel T.

“…The abundance of H2 in molecular clouds, relative to the commonly used tracer CO, has only been measured toward a few embedded stars, which may be surrounded…”
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The Nitrogen Carrier in Inner Protoplanetary Disks by Pontoppidan, Klaus M., Salyk, Colette, Banzatti, Andrea, Blake, Geoffrey A., Walsh, Catherine, Lacy, John H., Richter, Matthew J.

“…The dominant reservoirs of elemental nitrogen in protoplanetary disks have not yet been observationally identified. Likely candidates are HCN, NH3, and N2. The…”
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Spectrally Resolved Mid-infrared Molecular Emission from Protoplanetary Disks and the Chemical Fingerprint of Planetesimal Formation by Najita, Joan R., Carr, John S., Salyk, Colette, Lacy, John H., Richter, Matthew J., DeWitt, Curtis

“…We present high-resolution spectroscopy of mid-infrared molecular emission from two very active T Tauri stars, AS 205 N and DR Tau. In addition to measuring…”
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IONIZED GAS IN THE GALACTIC CENTER: NEW OBSERVATIONS AND INTERPRETATION by Irons, Wesley T, Lacy, John H, Richter, Matthew J

“…We present new observations of the [NeII] emission from the ionized gas in Sgr A West with improved resolution and sensitivity. About half of the emission…”
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Broadband High-Precision Faraday Rotation Spectroscopy with Uniaxial Single Crystal CeF3 Modulator by Lacy, John H., Patenotte, Gabriel E., Kinney, Abby C., Majumder, Protik K.

“…We present a low-noise (<10 µrad/Hz) broadband Faraday Rotation Spectroscopy method which is feasible for near-ultraviolet through near-infrared wavelengths…”
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High-Resolution Mid-Infrared Spectroscopy of NGC 7538 IRS 1: Probing Chemistry in a Massive Young Stellar Object by Knez, Claudia, Lacy, John H, Evans, Neal J, van Dishoeck, Ewine F, Richter, Matthew J

“…We present high-resolution (R = 75,000-100,000) mid-infrared spectra of the high-mass embedded young star IRS 1 in the NGC 7538 star-forming region. Absorption…”
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Tropical Cloud Cluster Climatology, Variability, and Genesis Productivity by Hennon, Christopher C., Papin, Philippe P., Zarzar, Christopher M., Michael, Jeremy R., Caudill, J. Adam, Douglas, Carson R., Groetsema, Wesley C., Lacy, John H., Maye, Zachery D., Reid, Justin L., Scales, Mark A., Talley, Melissa D., Helms, Charles N.

“…Tropical cloud clusters (TCCs) are traditionally defined as synoptic-scale areas of deep convection and associated cirrus outflow. They play a critical role in…”
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Circuit Model for HTS Flux Pump With Flux Conservation, Dynamic Resistance, and Flux Flow by Lacy, John H., Verdu, Jose L.

“…A switchless HTS flux pump and circuit model for a centimeter scale double-loop superconducting circuit of 2G-tape are presented. The flux pump mechanism…”
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INTERPRETATION OF INFRARED VIBRATION-ROTATION SPECTRA OF INTERSTELLAR AND CIRCUMSTELLAR MOLECULES by Lacy, John H

“…Infrared vibration-rotation lines can be valuable probes of interstellar and circumstellar molecules, especially symmetric molecules, which have no pure…”
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Superconducting Flux Pump for a Planar Magnetic Field Source by Lacy, John H., Cridland, April, Pinder, Jonathan, Uribe, Alberto, Willetts, Ryan, Verdu, Jose

“…We describe a novel use for superconducting flux pumping, namely a method for magnetizing a planar magnetic field source. The method is useful for many…”
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The Spatially Resolved Bipolar Nebula of Sakurai’s Object. II. Mapping the Planetary Nebula Expansion by Hinkle, Kenneth H., Joyce, Richard R., Matheson, Thomas, Lacy, John H., Richter, Matthew J.

“…Abstract Observations of the ejecta from the final flash (FF) of helium shell burning in Sakurai’s Object (V4334 Sgr) are presented for 2015–2019, a period…”
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High-resolution Mid-infrared Spectroscopy of GV Tau N: Surface Accretion and Detection of NH3 in a Young Protoplanetary Disk by Najita, Joan R., Carr, John S., Brittain, Sean D., Lacy, John H., Richter, Matthew J., Doppmann, Greg W.

“…Physical processes that redistribute or remove angular momentum from protoplanetary disks can drive mass accretion onto the star and affect the outcome of…”
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High-resolution Infrared Spectroscopy of Hot Molecular Gas in AFGL 2591 and AFGL 2136: Accretion in the Inner Regions of Disks around Massive Young Stellar Objects by Barr, Andrew G., Boogert, Adwin, DeWitt, Curtis N., Montiel, Edward, Richter, Matthew J., Lacy, John H., Neufeld, David A., Indriolo, Nick, Pendleton, Yvonne, Chiar, Jean, M. Tielens, Alexander G. G.

“…We have performed a high-resolution 4-13 m spectral survey of the hot molecular gas associated with the massive protostars AFGL 2591 and AFGL 2136, utilizing…”
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Coherent coupling of a trapped electron to a distant superconducting microwave cavity by Cridland Mathad, April, Lacy, John H., Pinder, Jonathan, Uribe, Alberto, Willetts, Ryan, Alvarez, Raquel, Verdú, José

“…We theoretically investigate the coupling of a single electron in a planar Penning trap with a remote superconducting microwave (MW) cavity. Coupling…”
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The Transition from Diffuse Molecular Gas to Molecular Cloud Material in Taurus by Federman, S. R., Rice, Johnathan S., Ritchey, A. M., Kim, Hwihyun, Lacy, John H., Goldsmith, Paul F., Flagey, Nicolas, Mace, Gregory N., Lambert, David L.

“…Abstract We study four lines of sight that probe the transition from diffuse molecular gas to molecular cloud material in Taurus. Measurements of atomic and…”
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A COMPARATIVE ASTROCHEMICAL STUDY OF THE HIGH-MASS PROTOSTELLAR OBJECTS NGC 7538 IRS 9 AND IRS 1 by BARENTINE, JOHN C, Lacy, John H

“…We report the results of a spectroscopic study of the high-mass protostellar object NGC 7538 IRS 9 and compare our observations to published data on the nearby…”
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[S IV] IN THE NGC 5253 SUPERNEBULA: IONIZED GAS KINEMATICS AT HIGH RESOLUTION by BECK, Sara C, LACY, John H, TURNER, Jean L, KRUGER, Andrew, RICHTER, Matt, CROSTHWAITE, Lucian P

“…The nearby dwarf starburst galaxy NGC 5253 hosts a deeply embedded radio-infrared supernebula excited by thousands of O stars. We have observed this source in…”
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The TEXES Survey for H2 Emission from Protoplanetary Disks by Bitner, Martin A, Richter, Matthew J, Lacy, John H, Herczeg, Gregory J, Greathouse, Thomas K, Jaffe, Daniel T, Salyk, Colette, Blake, Geoffrey A, Hollenbach, David J, Doppmann, Greg W, Najita, Joan R, Currie, Thayne

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High-Resolution Spectroscopy of [Ne II] Emission from AA Tau and GM Aur by Najita, Joan R, Doppmann, Greg W, Bitner, Martin A, Richter, Matthew J, Lacy, John H, Jaffe, Daniel T, Carr, John S, Meijerink, Rowin, Blake, Geoffrey A, Herczeg, Gregory J, Glassgold, Alfred E

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NGC 4102: High-resolution Infrared Observations of a Nuclear Starburst Ring by Beck, Sara C, Lacy, John H, Turner, Jean L

“…The composite galaxy NGC 4102 hosts a LINER nucleus and a starburst. We mapped NGC 4102 in the 12.8 Delta *mm line of [Ne II], using the echelon spectrometer…”
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