Results 51 to 60 of about 1,548 (142)

Single-epoch and Differential Astrometric Microlensing of Quasars

The Astrophysical Journal
We propose and discuss a new experimental approach to measure the centroid shift induced by gravitational microlensing in the images of lensed quasars (astrometric microlensing).
R. Forés-Toribio, E. Mediavilla, J. A. Muñoz, J. Jiménez-Vicente, C. Fian, C. del Burgo   +5 more
doaj   +1 more source

Real-time Collision-free Motion Planning for Next-generation Fiber Positioners in LAMOST

The Astronomical Journal
Multiobject fiber-fed spectrographs have thousands of fiber positioners packed on a focal plane with shared working space to move the fiber-ends in parallel, which maximizes observation time.
Guifeng Chen, Zhen Zhang, Chunhui Su, YongGang Gu, Chao Zhai   +4 more
doaj   +1 more source

Calculating Redshift via Astronomical Spectroscopy

, 2018
The Doppler effect is a well-known physical phenomenon which results in a change of a wave’s frequency or wavelength due to the motion of its source. Celestial objects in space (stars, galaxies, etc.) also experience a Doppler effect on their emitted electromagnetic radiation called redshift. In this study, redshifts were observed in the spectrographic
openaire   +2 more sources

Testing Photometric Techniques for Measuring the Rest-frame UV Spectral Slope against JWST PRISM Spectroscopy

The Astrophysical Journal
We present a sample of 53 galaxy spectra at z _SPEC  ∼ 5–12 from the JWST CEERS and RUBIES surveys, combining NIRSpec PRISM spectroscopy with NIRCam photometry. We aim to use these data to establish best practices for measuring the UV spectral slope ( β )
Alexa M. Morales, Steven L. Finkelstein, Pablo Arrabal Haro, Micaela B. Bagley, Antonello Calabrò, Óscar A. Chávez Ortiz, Kelcey Davis, Mark Dickinson, Eric Gawiser, Mauro Giavalisco, Nimish P. Hathi, Michaela Hirschmann, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Arianna S. Long, Ray A. Lucas, Fabio Pacucci, Casey Papovich, Borja Pautasso, Nor Pirzkal, Anthony J. Taylor, Alexander de la Vega, Stephen M. Wilkins, L. Y. Aaron Yung   +23 more
doaj   +1 more source

Astronomical Spectroscopy [PDF]

Nature, 1894
openaire   +1 more source

Ultra Low-Dispersion Spectroscopy with Gaia and Photographic Objective Prism Surveys

Acta Polytechnica, 2011
This paper discusses the ultra low-dispersion spectroscopy to be applied in the ESA Gaia space observatory and the ground-based objective-prism plate surveys. Although the dispersion in plate surveys is usually larger than in the Gaia BP/RP spectrometers,
R. Hudec, L. Hudec, M. Klíma
doaj  

Pyrrole without Life: Reaction of Aminomethylene with the Propargyl Radical. [PDF]

J Phys Chem Lett
McClish R, Schleier D, Kamer J, Kasper T, Hemberger P, Bodi A, Bouwman J.   +6 more
europepmc   +1 more source

A Large and Precise All-Sky Photometric Standard Star Dataset Across More Than 200 Passbands. [PDF]

Sci Data
Xiao K, Huang Y, Yuan H, Huang B, Fan D, Beers TC, Li Z, Han H, Zhang Q, Wang T, Ma M, Wang Y, Xu S, Yang L, Liu J.   +14 more
europepmc   +1 more source

Rotationally Resolved Predissociation Spectrum of the 1⁵Φ ← X⁵Δ Rovibronic Band of FeH^. [PDF]

J Phys Chem Lett
Jin S, Reimann M, van der Linde C, Ončák M, Beyer MK.   +4 more
europepmc   +1 more source

Chemistry in Extreme Environments: The Mystery of Molecular Complexity in Space. [PDF]

ACS Cent Sci
Puzzarini C, Alessandrini S.
europepmc   +1 more source