Results 21 to 30 of about 83,866 (252)
The Astrophysical Journal, 2023 The mechanism by which galaxies stop forming stars and get rid of their interstellar medium (ISM) remains elusive. Here, we study a sample of more than 2000 elliptical galaxies in which dust emission has been detected.
Aleksandra Leśniewska +6 more
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THE EXTENSIVE AGE GRADIENT OF THE CARINA DWARF GALAXY [PDF]
The Astrophysical Journal, 2012 Accepted for publication in The Astrophysical Journal ...
Battaglia +5 more
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Resolving Stellar Populations outside the Local Group: MAD observations of UKS2323-326 [PDF]
, 2008 We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS2323-326.
A. Baruffolo +40 more
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The age of blue LSB galaxies [PDF]
Astronomy & Astrophysics, 2009 (Abridged). Low metallicities, large gas-to-star mass ratios, and blue colors of most low surface brightness (LSB) galaxies imply that these systems may be younger than their high surface brightness counterparts. We seek to find observational signatures that can help to constrain the age of blue LSB galaxies.
Vorobyov, E. I. +4 more
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CEERS Key Paper. IV. A Triality in the Nature of HST-dark Galaxies
The Astrophysical Journal Letters, 2023 The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate in unprecedented detail the nature of optical/near-IR-faint, mid-IR-bright sources, with HST-dark galaxies among them.
Pablo G. Pérez-González +54 more
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The Evolved Red Stellar Contents of the Sculptor Group Galaxies NGC55, NGC300, and NGC7793 [PDF]
, 1998 Deep J, H, and K images are used to probe the evolved stellar contents in the central regions of the Sculptor group galaxies NGC55, NGC300, and NGC7793. The brightest stars are massive red supergiants (RSGs) with K ~ 15 - 15.5. The peak RSG brightness is
Andredakis Y. C. +11 more
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ABYSS. I. Targeting Strategy for the APOGEE and BOSS Young Star Survey in SDSS-V
The Astrophysical Journal Supplement Series, 2023 The fifth iteration of the Sloan Digital Sky Survey is set to obtain optical and near-infrared spectra of ∼5 million stars of all ages and masses throughout the Milky Way. As a part of these efforts, APOGEE and BOSS Young Star Survey (ABYSS) will observe
Marina Kounkel +17 more
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The Arecibo Galaxy Environment Survey VII : A Dense Filament With Extremely Long HI Streams [PDF]
, 2014 We present completed observations of the NGC 7448 galaxy group and background volume as part of the blind neutral hydrogen Arecibo Galaxy Environment Survey (AGES).
Davies, J. I. +5 more
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Probing the Age of Elliptical Galaxies
, 1996 In this paper we address the question whether age and metallicity effects can be disentangled with the aid of the broad-band colours and spectral indices from absorption feature strengths, so that the age of elliptical galaxies can be inferred. The observational data under examination are the indices Hbeta and [MgFe], and the velocity dispersion Sigma ...
Bressan, A., Chiosi, C., Tantalo, R.
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Revista Mexicana de Astronomía y Astrofísica, 2020 We explore the environmental dependence of the age and the clustering-age dependence of active galaxies in two volume-limited active galaxy samples of the SDSS. In the luminous volume-limited sample, the age of active galaxies apparently depends on environments: at low density the fraction of young galaxies with ages less than 2 Gyr is significantly ...
Xin-Fa Deng, Xiao-Qing Wen
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