Results 1 to 10 of about 141,590 (329)
Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides [PDF]
Nature Communications, 2023 Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical constants on cosmological scales.
Markus Ludwig +23 more
doaj +3 more sources
Astronomical Spectroscopy [PDF]
, 2010 Spectroscopy is one of the most important tools that an astronomer has for studying the universe. This chapter begins by discussing the basics, including the different types of optical spectrographs, with extension to the ultraviolet and the near-infrared.
Philip Massey, Margaret M. Hanson
arxiv +6 more sources
Random Access Addressing of MEMS Electrostatic Shutter Array for Multi-Object Astronomical Spectroscopy [PDF]
Micromachines, 2020 An extended version of cross-bar type addressing technique is developed for three-port electrostatic micro shutters arranged in an arrayed format. A microelectromechanical systems (MEMS) shutter blade suspended by a pair of torsion beams works as a ...
Xufeng Liu +4 more
doaj +3 more sources
X-RAY ASTRONOMICAL SPECTROSCOPY [PDF]
Exploring the Universe, 1980 The current status of the X-ray spectroscopy of celestial X-ray sources, ranging from nearby stars to distant quasars, is reviewed. Particular emphasis is placed on the role of such spectroscopy as a useful and unique tool in the elucidation of the physical parameters of the sources.
Stephen S. Holt
openaire +4 more sources
Trend Filtering -- I. A Modern Statistical Tool for Time-Domain Astronomy and Astronomical Spectroscopy [PDF]
Trend filtering -- I. A modern statistical tool for time-domain
astronomy and astronomical spectroscopy, Monthly Notices of the Royal
Astronomical Society, Volume 492, Issue 3, March 2020, Pages 4005 - 4018, 2019 The problem of denoising a one-dimensional signal possessing varying degrees of smoothness is ubiquitous in time-domain astronomy and astronomical spectroscopy. For example, in the time domain, an astronomical object may exhibit a smoothly varying intensity that is occasionally interrupted by abrupt dips or spikes.
Collin A. Politsch +3 more
arxiv +3 more sources
High-resolution millimeter-wave spectroscopy of CH$_2$DCl: paving the way for future astronomical observations of chloromethane isotopologues [PDF]
Journal of Quantitative Spectroscopy and Radiative Transfer,
Volume 248, June 2020, 106982, 2020 Chloromethane is the only organochloride detected in space to date. Its recent observation towards the low-mass protostar IRAS 16293-2422 with ALMA offers a prompt for new laboratory studies of CH$_3$Cl and its isotopologues. Here, we report the investigation of the rotational spectrum of monodeuterated chloromethane CH$_2$DCl in the frequency region ...
Mattia Melosso +6 more
arxiv +3 more sources
Astronomical imaging Fourier spectroscopy at far-infrared wavelengths [PDF]
Canadian Journal of Physics, 91, 11, p. 870-878 (Nov 2013), 2013 The principles and practice of astronomical imaging Fourier transform spectroscopy (FTS) at far-infrared wavelengths are described. The Mach-Zehnder interferometer design has been widely adopted for current and future imaging FTS instruments; we compare this design with two other common interferometer formats. Examples of three instruments based on the
David A. Naylor +3 more
arxiv +3 more sources
The missing conformer: A comprehensive rotational spectroscopy study and astronomical search of two conformers of methyl cyanoacetate [PDF]
Frontiers in Astronomy and Space Sciences, 2022 We performed a comprehensive investigation of methyl cyanoacetate (MCA) using high-resolution Fourier transform rotational spectroscopy. Two low energy conformers of MCA were observed in the vibrational ground state, in selected frequency regions from 2 ...
Gayatri Batra +9 more
doaj +2 more sources
Characterization of Lenslet Arrays for Astronomical Spectroscopy [PDF]
Publications of the Astronomical Society of the Pacific, 2001 Microlens arrays are now widely used in a variety of astronomical instruments that require high performance. This paper describes the applications of microlenses in astronomical spectroscopy and discusses the necessary performance requirements. A variety of optical tests, including high dynamic range point-spread function measurements and determination
Deqing Ren +3 more
openaire +4 more sources