Results 81 to 90 of about 1,426,420 (265)
The MaNGA Dwarf Galaxy Sample (MaNDala): Stellar Profiles and Gradients Characterization
The Astronomical JournalWe derived robust radial profiles and inner/outer gradients of various stellar population (SP) properties for a sample of 124 bright dwarf galaxies, 10 ^7.53 ≤ M _* / M _⊙ ≤ 10 ^9.06 , from the MaNDala sample, using integral field spectroscopy ...
M. Cano-Díaz +10 more
doaj +1 more source
A Solar Analog Model for Decrease in Far Ultraviolet Irradiance Under a Grand Minimum
Earth and Space Science, Volume 13, Issue 9, September 2026.Abstract Solar analog field stars having a range of magnetic activity can provide an estimate of solar spectral irradiance (SSI) variability relevant to understanding the Sun's influence on terrestrial climate. This approach is particularly useful for far ultraviolet (FUV) irradiance that cannot be observed from the Earth surface.
D. Lubin, C. Melis, D. Tytler
wiley +1 more source
Environment Shaping Galaxies: Spectroscopy of Cluster Galaxies
, 2002 10 pages, Latex, newpasp macro included, 5 postscript figures. Invited talk at the meeting "Matter and energy in clusters of galaxies", Taiwan 23-27 Apr 2002, proceedings in ...
openaire +2 more sources
Optical Spectroscopy of the Unusual Galaxy J2310-43
The Astronomical Journal, 1997 We present and discuss new spectroscopic observations of the unusual galaxy J2310-43. The observations cover a wide wavelength range, from 3700 A to 9800 A allowing the study of both the regions where H alpha and the Ca II ``contrast'' are expected. No evidence for H alpha in emission is found and we thus confirm the absence of emission lines in the ...
Caccianiga, A., Maccacaro, T.
openaire +2 more sources
Separation of galaxy spectra measured with slitless spectroscopy
Digital Signal Processing, 2020 Abstract This paper investigates the problem of separating galaxy spectra resulting from the slitless spectroscopy system, which can e.g. be used in spatial missions like the WISP survey and the Euclid project. We first derive a physical mixing model linking observed data to source spectra, then simplify it to obtain two different approximate but ...
Hosseini, Shahram +3 more
openaire +4 more sources
INFRARED SPECTROSCOPY OF NEARBY RADIO ACTIVE ELLIPTICAL GALAXIES [PDF]
The Astrophysical Journal Supplement Series, 2012 In preparation for a study of their circumnuclear gas we have surveyed 60% of a complete sample of elliptical galaxies within 75 Mpc that are radiosources. Some 20% of our nuclear spectra have infrared emission lines, mostly Paschen lines, Brackett gamma and [FeII]. We consider the influence of radio power and black hole mass in relation to the spectra.
Mould, Jeremy +9 more
openaire +5 more sources
Are High-Σ1 Massive Blue Spiral Galaxies Rejuvenated Systems?
The Astrophysical JournalQuiescent galaxies generally possess denser cores than star-forming galaxies with similar mass. As a measurement of the core density, the central stellar mass surface density within a radius of 1 kpc (Σ _1 ) was thus suggested to be closely related to ...
Cai-Na Hao +7 more
doaj +1 more source
Cosmic Ray Anisotropy Generated by the June 22nd 2015 Interplanetary Events
Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.Abstract On 22 June 2015, the near Earth interplanetary space was perturbed by a series of high‐speed streamers and interplanetary coronal mass ejections associated with an active region and two low‐latitude coronal holes. The interaction of these disturbances gave rise to the complex solar wind structure observed at 1 au.
A. Lara, K. P. Arunbabu, T. Niembro
wiley +1 more source
Selective Membrane Transport Systems studied by Solid-State NMR Spectroscopy [PDF]
, 2009 Membranes border cells from their environment. Thus, they belong to the basic prerequisites for life as we know it. Within cells, membranes are used to establish compartments dedicated to specific tasks such as providing local proximity of components ...
Ader, C. +3 more
core +1 more source
The Astrophysical JournalModern spectroscopic surveys can only target a small fraction of the vast amount of photometrically cataloged sources in wide-field surveys. Here, we report the development of a generative artificial intelligence (AI) method capable of predicting optical
Lars Doorenbos +8 more
doaj +1 more source