Results 21 to 30 of about 711,060 (330)

Hidden Little Monsters: Spectroscopic Identification of Low-mass, Broad-line AGNs at z > 5 with CEERS

Astrophysical Journal Letters, 2023
We report on the discovery of two low-luminosity, broad-line active galactic nuclei (AGNs) at z > 5 identified using JWST NIRSpec spectroscopy from the Cosmic Evolution Early Release Science (CEERS) survey.
D. Kocevski, M. Onoue, K. Inayoshi, J. Trump, P. Haro, A. Grazian, M. Dickinson, S. Finkelstein, J. Kartaltepe, M. Hirschmann, J. Aird, B. Holwerda, S. Fujimoto, S. Juneau, R. Amorín, B. Backhaus, M. Bagley, G. Barro, E. Bell, L. Bisigello, A. Calabró, N. Cleri, M. Cooper, Xuheng Ding, N. Grogin, L. Ho, T. Hutchison, A. Inoue, Linhua Jiang, Brenda Jones, A. Koekemoer, Wenxiu Li, Zhengrong Li, E. McGrath, J. Molina, C. Papovich, P. Pérez-González, N. Pirzkal, S. Wilkins, Guang Yang, L. Y. Aaron Yung   +40 more
semanticscholar   +1 more source

Discovery of the Elusive Carbonic Acid (HOCOOH) in Space

The Astrophysical Journal, 2023
A quarter century after the detection of the last interstellar carboxylic acid, acetic acid (CH _3 COOH), we report the discovery of a new one, the cis-trans form of carbonic acid (HOCOOH), toward the Galactic center molecular cloud G+0.693–0.027. HOCOOH
Miguel Sanz-Novo, Víctor M. Rivilla, Izaskun Jiménez-Serra, Jesús Martín-Pintado, Laura Colzi, Shaoshan Zeng, Andrés Megías, Álvaro López-Gallifa, Antonio Martínez-Henares, Sarah Massalkhi, Belén Tercero, Pablo de Vicente, Sergio Martín, David San Andrés, Miguel A. Requena-Torres   +14 more
doaj   +1 more source

MS Ana: Improving Sensitivity in Peptide Identification with Spectral Library Search

Journal of Proteome Research, 2023
Spectral library search can enable more sensitive peptide identification in tandem mass spectrometry experiments. However, its drawbacks are the limited availability of high-quality libraries and the added difficulty of creating decoy spectra for result ...
S. Dorl, Stephan Winkler, K. Mechtler, Viktoria Dorfer   +3 more
semanticscholar   +1 more source

Detection and identification of microplastics directly in water by hyperspectral imaging [PDF]

EPJ Web of Conferences, 2023
We use hyperspectral imaging to identify the plastic types constituting mixtures of microplastics directly in water. For the current study we used known microplastics made by milling original pristine plastic sheets and mixed them in water.
Gebejes Ana, Kaynathare Boniphace, Hrovat Blaž, Semenov Dmitri, Itkonen Tommi, Keinänen Markku, Koistinen Arto, Peiponen Kai-Erik, Roussey Matthieu   +8 more
doaj   +1 more source

A spectral line survey of Orion KL in the bands 486-492 and 541-577 GHz with the Odin satellite I. The observational data [PDF]

, 2007
Spectral line surveys are useful since they allow identification of new molecules and new lines in uniformly calibrated data sets. Nonetheless, large portions of the sub-millimetre spectral regime remain unexplored due to severe absorptions by H2O and O2
A. Lecacheux, A. Nummelin, A. O. H. Olofsson, Aa. Sandqvist, Amano, B. Larsson, Beuther, Beuther, Blake, C. M. Persson, Cernicharo, Civis, Comito, E. S. Wirström, Frisk, Genzel, Goldsmith, Goldsmith, J. H. Black, Lee, M. Olberg, McCarthy, Melnick, Müller, N. Koning, Olofsson, Olofsson, P. Bergman, P. F. Bernath, Pagani, Pardo, Pardo, Persson, Pickett, Rodríguez-Franco, S. Kwok, Saito, Schilke, Schilke, Sempere, Senekowitsch, Siringo, T. I. Hasegawa, Takano, Turner, Turner, U. Frisk, Ungerechts, W. Geppert, White, Wirström, Wright, Yamamura, Zuckerman, Å. Hjalmarson   +54 more
core   +2 more sources

New H2 collision-induced absorption and NH3 opacity and the spectra of the coolest brown dwarfs [PDF]

, 2012
We present new cloudy and cloudless model atmospheres for brown dwarfs using recent ab initio calculations of the line list of ammonia (NH3) and of the collision-induced absorption of molecular hydrogen (H2).
Ackerman, Allard, Allard, Allende Prieto, Bochanski, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burrows, Burrows, Burrows, Cushing, Cushing, Cushing, Cushing, Dahn, Didier Saumon, Dulick, Fegley, Freedman, Frommhold, Geballe, Geballe, Grevesse, Hargreaves, Hubeny, Jorgensen, Kirkpatrick, Kirkpatrick, Kirkpatrick, Knapp, Leggett, Leggett, Leggett, Leggett, Leggett, Leggett, Liu, Liu, Lodders, Lodders, Lodders, Lothar Frommhold, Luhman, Mainzer, Mark S. Marley, Marley, Marley, Martin Abel, Noll, Partridge, Perryman, Plez, Richard, Richard S. Freedman, Roellig, Saumon, Saumon, Saumon, Saumon, Sharp, Stephens, Tinney, Vrba   +69 more
core   +2 more sources

Spectroscopic r-Process Abundance Retrieval for Kilonovae. I. The Inferred Abundance Pattern of Early Emission from GW170817

The Astrophysical Journal, 2023
Freshly synthesized r -process elements in kilonovae ejecta imprint absorption features on optical spectra, as observed in the GW170817 binary neutron star merger. These spectral features encode insights into the physical conditions of the r -process and
Nicholas Vieira, John J. Ruan, Daryl Haggard, Nicole Ford, Maria R. Drout, Rodrigo Fernández, N. R. Badnell   +6 more
doaj   +1 more source

The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder II. Estimating Radial Velocity of SPIRE Spectral Observation Sources

, 2020
The Herschel SPIRE FTS Spectral Feature Finder (FF) detects significant spectral features within SPIRE spectra and employs two routines, and external references, to estimate source radial velocity.
Benson, Chris S., Hladczuk, Natalia, Hopwood, Rosalind, Scott, Jeremy P., Spencer, Locke D., Valtchanov, Ivan   +5 more
core   +1 more source

Optimization and identification technology of hyperspectral spectral features of insulator pollution levels

电力工程技术, 2022
To solve the problem of traditional pollution detection methods on the prevention and control of pollution flashover of transmission line insulators,the non-contact and high-resolution hyperspectral technology is used to study the on-line pollution ...
SHEN Long, QIAN Guochao, PENG Zhaoyu, LI Qianhui, YANG Kun, MA Yutang   +5 more
doaj   +1 more source

Tentative detection of phosphine in IRC+10216 [PDF]

, 2008
The J,K = 1,0-0,0 rotational transition of phosphine (PH3) at 267 GHz has been tentatively identified with a T_MB = 40 mK spectral line observed with the IRAM 30-m telescope in the C-star envelope IRC+10216.
Adams, Agúndez, Agúndez, Castor, Cazzoli, Cernicharo, Cernicharo, Danby, Davies, Field, Fonfría, Fonfría, Guélin, Halfen, Hasegawa, J. Cernicharo, J. R. Pardo, Keady, M. Agúndez, M. Guélin, Machin, MacKay, Mbosei, Müller, Sanz, T. G. Phillips, Tenenbaum, Thorne, Turner, Turner, Turner, Turner, Weisstein, Ziurys   +33 more
core   +3 more sources