Results 1 to 10 of about 83,866 (252)
Deep MOS Spectroscopy of NGC 1316 Globular Clusters [PDF]
Galaxies, 2017 The giant elliptical galaxy NGC 1316 is the brightest galaxy in the Fornax cluster, and displays a number of morphological features that might be interpreted as an intermediate age merger remanent (∼3 Gyr).
Leandro A. Sesto +3 more
doaj +6 more sources
AGES: THE AGN AND GALAXY EVOLUTION SURVEY [PDF]
Astrophysical Journal, Supplement Series, 2012 The AGN and Galaxy Evolution Survey (AGES) is a redshift survey covering, in its standard fields, 7.7 square degrees of the Bootes field of the NOAO Deep Wide-Field Survey (NDWFS). The final sample consists of 23745 redshifts. There are well-defined galaxy samples in ten bands (the Bw, R, I, J, K, IRAC 3.6, 4.5, 5.8 and 8.0 micron and MIPS 24 micron ...
C S Kochanek, D J Eisenstein, R J Cool
exaly +3 more sources
The Astrophysical JournalObservations of large amounts of massive galaxies with relatively old populations found at high redshifts are challenging galaxy formation scenarios within the standard cosmology.
Chong-Yu Gao +2 more
doaj +2 more sources
Spectroscopic Ages and Metallicities of Galaxies [PDF]
EAS Publications Series, 2011 Dwarf galaxies are generally faint. To derive their age and metallicity distributions, it is critical to optimize the use of any collected photon. Koleva et al., using full spectrum fitting, have found strong population gradients in some dwarf elliptical galaxies.
Koleva, M. +4 more
openaire +4 more sources
The Chemodynamics of the Stellar Populations in M31 from APOGEE Integrated-light Spectroscopy
The Astrophysical Journal, 2023 We present an analysis of nearly 1000 near-infrared, integrated-light spectra from APOGEE in the inner ∼7 kpc of M31. We utilize full-spectrum fitting with A-LIST simple stellar population spectral templates that represent a population of stars with the ...
Benjamin J. Gibson +10 more
doaj +1 more source
Age Estimates for Galaxies in Groups [PDF]
International Astronomical Union Colloquium, 2000 AbstractWe discuss recent developments on the age and metallicity distribution for early type galaxies in different environments.
Forbes, Duncan, Terlevich, Alejandro I.
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The Shapes and Ages of Elliptical Galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 1996 Normally elliptical galaxies are thought to be old, evolved systems, but recently a controversy has arisen over the age of ellipticals. Measurements by Gonzáles (1993, Ph.D. thesis, UCSC) show that the Hβ absorption indices of ellipticals span a range of values.
Jong, R, Davies, R
openaire +6 more sources
A Nearby Isolated Dwarf: Star Formation and Structure of ESO 006–001
The Astrophysical Journal, 2023 Observations with the Hubble Space Telescope unexpectedly revealed that the dwarf galaxy ESO 006–001 is a near neighbor to the Local Group at a distance of 2.70 ± 0.11 Mpc.
Lidia N. Makarova +6 more
doaj +1 more source
Galaxies into the Dark Ages [PDF]
The Astrophysical Journal, 2017 Abstract We consider the capabilities of current and future large facilities operating at 2–3 mm wavelength to detect and image the [C ii] 158 μm line from galaxies into the cosmic “dark ages” (z ∼ 10–20). The [C ii] line may prove to be a powerful tool in determining spectroscopic redshifts, and galaxy dynamics, for the first galaxies ...
C. L. Carilli +3 more
openaire +2 more sources
On the Root Cause of the Host “Mass Step” in the Hubble Residuals of Type Ia Supernovae
The Astrophysical Journal, 2023 It is well established that the Hubble residuals of Type Ia supernovae (SNe Ia) show the luminosity step with respect to their host galaxy stellar masses.
Chul Chung +6 more
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