Results 41 to 50 of about 4,742 (219)
The Lyα Sky as Observed by New Horizons at 57 au
The Astronomical JournalDuring 2023 September the Alice ultraviolet spectrograph on the New Horizons (NH) spacecraft was used to map diffuse Lyα emission over most of the sky, at a range of ∼56.9 au from the Sun.
G. Randall Gladstone +24 more
doaj +1 more source
No “Maunder Minimum” Candidates in M67: Mitigating Interstellar Contamination of Chromospheric Emission Lines [PDF]
The Astronomical Journal, 2017 Abstract The solar analogs of M67 let us glimpse the probable behavior of the Sun on timescales surpassing the duration of human civilization. M67 can serve as a solar proxy because its stars share a similar age and composition with the Sun.
openaire +2 more sources
The Evolution of Emission Lines in HII Galaxies as a Probe of Interaction between Stellar and Interstellar Component [PDF]
Astrophysics and Space Science, 2002 HII galaxies are powered by clusters of hot massive stars ionizing their environment. By considering HII galaxies in different evolutionary stages with respect to the most recent star formation event, one can get insight into their evolution and interaction with the interstellar medium.
G. Stasińska, D. Schaerer, C. Leitherer
openaire +1 more source
Journal of Field Robotics, EarlyView.ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang +3 more
wiley +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Volatile‐rich xenolithic clasts in different types of brecciated meteorites represent unique pristine solar system material. This study investigates the maturity and thermal history of organic matter using Raman spectroscopy and aqueous alteration effects using infrared spectroscopy in the matrix of 15 volatile‐rich clasts (C1 and CM‐like ...
Swarna Prava Das +7 more
wiley +1 more source
The location and kinematics of the emission line regions in Active Galactic Nuclei [PDF]
, 2008 This thesis contains the results from a study of the optical emission lines of various samples of active galactic nuclei (AGN). We have used three separate techniques to determine the precise kinematics and the relative location of the emission line ...
Mullaney, J R, Mullaney, J.R.
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The Astronomical JournalWe present the first detection of helium radio recombination lines (HeRRLs) at 800 MHz from the diffuse ionized gas (DIG) in the Cygnus X region, with an ionized helium-to-hydrogen ratio ( ${{n}}_{{\rm{H}}{\rm{e}}}^{+}/{{n}}_{{\rm{H}}}^{+}$ ) of 0.06 ± 0.
D. Anish Roshi +6 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2023 High-resolution absorption, dispersed fluorescence emission, and photoionization cross sections are presented for gas-phase adamantane excited by synchrotron radiation in the exciting-photon energy range of 6–30 eV. Relative and absolute absorption cross
Lutz Marder +11 more
doaj +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Amorphous carbon (αC) is found in various extraterrestrial particles, including those thought to originate from the outer Solar System. αC can form through two main processes involving C‐rich materials: exposure to energetic charged particles and thermal processing.
M. Germanà +10 more
wiley +1 more source
Optical polarimetry studies of Seyfert galaxies [PDF]
, 1999 Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
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