Zobrazeno 1 - 10
of 455
pro vyhledávání: '"Neufeld, David A."'
Autor:
Neufeld, David A., Manoj, P., Tyagi, Himanshu, Narang, Mayank, Watson, Dan M., Megeath, S. Thomas, Van Dishoeck, Ewine F., Gutermuth, Robert A., Stanke, Thomas, Yang, Yao-Lun, Rubinstein, Adam E., Anglada, Guillem, Beuther, Henrik, Garatti, Alessio Caratti o, Evans II, Neal J., Federman, Samuel, Fischer, William J., Green, Joel, Klaassen, Pamela, Looney, Leslie W., Osorio, Mayra, Nazari, Pooneh, Tobin, John J., Tychoniec, Lukasz, Wolk, Scott
Using the MIRI/MRS spectrometer on JWST, we have detected pure rotational, suprathermal OH emissions from the vicinity of the intermediate-mass protostar HOPS 370 (OMC2/FIR3). These emissions are observed from shocked knots in a jet/outflow, and orig
Externí odkaz:
http://arxiv.org/abs/2404.07299
Autor:
González-Alfonso, Eduardo, García-Bernete, Ismael, Pereira-Santaella, Miguel, Neufeld, David A., Fischer, Jacqueline, Donnan, Fergus R.
Mid-infrared (mid-IR) gas-phase molecular bands are powerful diagnostics of the warm interstellar medium. We report the James Webb Space Telescope detection of the CO v=1-0 (4.4-5.0 um) and H2O nu2=1-0 (5.0-7.8um) ro-vibrational bands, both in absorp
Externí odkaz:
http://arxiv.org/abs/2312.04914
Publikováno v:
Power, Energy and Electrical Engineering, Volume 54, 2024, Pages 589-600
The goal of the load flow study is to ensure that electrical power is delivered efficiently and reliably to end-users while maintaining the stability and security of the power system. Newton-Raphson is a numerical method used widely for load flow ana
Externí odkaz:
http://arxiv.org/abs/2310.19953
Autor:
Kálosi, Ábel, Gamer, Lisa, Grieser, Manfred, von Hahn, Robert, Isberner, Leonard W., Jäger, Julia I., Kreckel, Holger, Neufeld, David A., Paul, Daniel, Savin, Daniel W., Schippers, Stefan, Schmidt, Viviane C., Wolf, Andreas, Wolfire, Mark G., Novotný, Oldřich
Observations of OH$^+$ are used to infer the interstellar cosmic ray ionization rate in diffuse atomic clouds, thereby constraining the propagation of cosmic rays through and the shielding by interstellar clouds, as well as the low energy cosmic ray
Externí odkaz:
http://arxiv.org/abs/2309.17015
Autor:
Li, Jialu, Boogert, Adwin, Barr, Andrew G., DeWitt, Curtis, Rashman, Maisie, Neufeld, David, Indriolo, Nick, Pendleton, Yvonne, Montiel, Edward, Richter, Matt, Chiar, J. E., Tielens, Alexander G. G.
We present in this paper mid-infrared (5-8~$\mu$m) spectroscopy toward the massive young binary W3~IRS~5, using the EXES spectrometer in high-resolution mode ($R\sim$50,000) from the NASA Stratospheric Observatory for Infrared Astronomy (SOFIA). Many
Externí odkaz:
http://arxiv.org/abs/2306.13798
Autor:
Watson, Dan M., Calvet, Nuria P., Fischer, William J., Forrest, W. J., Manoj, P., Megeath, S. Thomas, Melnick, Gary J., Najita, Joan, Neufeld, David A., Sheehan, Patrick D., Stutz, Amelia M., Tobin, John J.
We have surveyed 84 Class 0, Class I, and flat-spectrum protostars in mid-infrared [Si II], [Fe II], and [S I] line emission, and 11 of these in far-infrared [O I] emission. We use the results to derive their mass. outflow rates, (M) over dot(w). The
Externí odkaz:
http://hdl.handle.net/10150/622058
http://arizona.openrepository.com/arizona/handle/10150/622058
http://arizona.openrepository.com/arizona/handle/10150/622058
Autor:
Paul, Daniel, Grieser, Manfred, Grussie, Florian, von Hahn, Robert, Isberner, Leonard W., Kálosi, Ábel, Krantz, Claude, Kreckel, Holger, Müll, Damian, Neufeld, David A., Savin, Daniel W., Schippers, Stefan, Wilhelm, Patrick, Wolf, Andreas, Wolfire, Mark G., Novotný, Oldřich
Observations of CH$^+$ are used to trace the physical properties of diffuse clouds, but this requires an accurate understanding of the underlying CH$^+$ chemistry. Until this work, the most uncertain reaction in that chemistry was dissociative recomb
Externí odkaz:
http://arxiv.org/abs/2208.14927
Autor:
Neufeld, David A.
An infrared L- and M-band spectral survey, performed toward the young planetary nebula NGC 7027 with the iSHELL instrument on NASA's Infrared Telescope Facility (IRTF), has revealed more than 20 vibrational lines of the molecules HeH$^+$, H$_2$, and
Externí odkaz:
http://arxiv.org/abs/2205.05796
Autor:
Jacob, Arshia M., Menten, Karl M., Wyrowski, Friedrich, Winkel, Benjamin, Neufeld, David A., Koribalski, Baerbel S.
Publikováno v:
A&A 659, A152 (2022)
Along several sight lines within the Milky Way ArH+ has been ubiquitously detected with only one detection in extragalactic environments, namely along two sight lines in the red shift z=0.89 absorber towards the lensed blazar PKS 1830-211. Being form
Externí odkaz:
http://arxiv.org/abs/2112.15546
Autor:
Neufeld, David A., Wiesemeyer, Helmut, Wolfire, Mark J., Jacob, Arshia, Buchbender, Christof, Gerin, Maryvonne, Gupta, Harshal, Güsten, Rolf, Schilke, Peter
We have revisited the chemistry of chlorine-bearing species in the diffuse interstellar medium with new observations of the HCl$^+$ molecular ion and new astrochemical models. Using the GREAT instrument on board SOFIA, we observed the $^2\Pi_{3/2}\,
Externí odkaz:
http://arxiv.org/abs/2106.00744