scholarly journals Homogenization of the Stellar Population along Late-Type Spiral Galaxies

2001 ◽  
Vol 122 (3) ◽  
pp. 1298-1318 ◽  
Author(s):  
D. A. Gadotti ◽  
S. dos Anjos
Keyword(s):  
Stellar Population ◽  
Spiral Galaxies ◽  
Late Type

scholarly journals The Stellar Content of the Nuclei of Spiral Galaxies

1983 ◽  
Vol 6 ◽  
pp. 157-163
Author(s):  
D. Crampton ◽  
R.D. McClure ◽  
A.P. Cowley
Keyword(s):  
Spectral Type ◽  
Stellar Population ◽  
Main Sequence ◽  
Spiral Galaxies ◽  
Elliptical Galaxies ◽  
Solar Neighbourhood ◽  
Stellar Content ◽  
Late Type ◽  
Metal Abundances ◽  
Hydrogen Lines

Numerous studies have been attempted to determine the stellar content of the nuclei of galaxies. In the case of elliptical galaxies observations show that there is a change in spectral type from later to earlier types correlated with a variation from high to low luminosity (e.g. Faber 1977). This has been interpreted for the most part as being due to differences in metal abundances in an old stellar population, although some recent studies suggest a variation in stellar age may be important as well (e.g. O’Connell 1980, Heckman 1980). The nuclear bulges of spiral galaxies also display a change from late to early spectral type along a sequence from high to low luminosity bulges. In this case, however, the assumption has almost universally been made that these differences are due to differences in age of the stellar population. In particular, most stellar models for the nuclear bulges of spiral galaxies have used solar neighbourhood metal- rich stars, and assumed that the strong hydrogen lines and weak metal lines in late-type spiral nuclei are due to the predominance of a very young main-sequence population rather than old metal-poor stars.

scholarly journals SDSS-IV MaNGA: radial gradients in stellar population properties of early-type and late-type galaxies

2021 ◽  
Vol 502 (4) ◽  
pp. 5508-5527
Author(s):  
Taniya Parikh ◽  
Daniel Thomas ◽  
Claudia Maraston ◽  
Kyle B Westfall ◽  
Brett H Andrews ◽  
...  
Keyword(s):  
Stellar Population ◽  
Mass Range ◽  
Mass Relation ◽  
Individual Element ◽  
Late Type ◽  
Element Abundances ◽  
Entire Mass Range ◽  
Strong Gradient ◽  
Star Formation Histories ◽  
Absorption Features

ABSTRACT We derive ages, metallicities, and individual element abundances of early- and late-type galaxies (ETGs and LTGs) out to 1.5 Re. We study a large sample of 1900 galaxies spanning 8.6–11.3 log M/M⊙ in stellar mass, through key absorption features in stacked spectra from the SDSS-IV/MaNGA survey. We use mock galaxy spectra with extended star formation histories to validate our method for LTGs and use corrections to convert the derived ages into luminosity- and mass-weighted quantities. We find flat age and negative metallicity gradients for ETGs and negative age and negative metallicity gradients for LTGs. Age gradients in LTGs steepen with increasing galaxy mass, from −0.05 ± 0.11 log Gyr/Re for the lowest mass galaxies to −0.82 ± 0.08 log Gyr/Re for the highest mass ones. This strong gradient–mass relation has a slope of −0.70 ± 0.18. Comparing local age and metallicity gradients with the velocity dispersion σ within galaxies against the global relation with σ shows that internal processes regulate metallicity in ETGs but not age, and vice versa for LTGs. We further find that metallicity gradients with respect to local σ show a much stronger dependence on galaxy mass than radial metallicity gradients. Both galaxy types display flat [C/Fe] and [Mg/Fe], and negative [Na/Fe] gradients, whereas only LTGs display gradients in [Ca/Fe] and [Ti/Fe]. ETGs have increasingly steep [Na/Fe] gradients with local σ reaching 6.50 ± 0.78 dex/log km s−1 for the highest masses. [Na/Fe] ratios are correlated with metallicity for both galaxy types across the entire mass range in our sample, providing support for metallicity-dependent supernova yields.

scholarly journals The inner mass distribution of late-type spiral galaxies fromSAURONstellar kinematic maps

2016 ◽  
Vol 464 (2) ◽  
pp. 1903-1922 ◽  
Author(s):  
Veselina Kalinova ◽  
Glenn van de Ven ◽  
Mariya Lyubenova ◽  
Jesús Falcón-Barroso ◽  
Dario Colombo ◽  
...  
Keyword(s):  
Mass Distribution ◽  
Spiral Galaxies ◽  
Late Type

AHubble Space TelescopeCensus of Nuclear Star Clusters in Late-Type Spiral Galaxies. II. Cluster Sizes and Structural Parameter Correlations

2004 ◽  
Vol 127 (1) ◽  
pp. 105-118 ◽  
Author(s):  
Torsten Bker ◽  
Marc Sarzi ◽  
Dean E. McLaughlin ◽  
Roeland P. van der Marel ◽  
Hans-Walter Rix ◽  
...  
Keyword(s):  
Spiral Galaxies ◽  
Star Clusters ◽  
Structural Parameter ◽  
Late Type

scholarly journals Hubble Sequence as a Temporal Evolution Sequence

1999 ◽  
Vol 186 ◽  
pp. 491-491
Author(s):  
Xiaolei Zhang
Keyword(s):  
Spiral Galaxies ◽  
Temporal Evolution ◽  
Natural Question ◽  
Late Type ◽  
Present Epoch ◽  
Hubble Sequence ◽  
Deep Survey ◽  
Deep Fields ◽  
The Universe ◽  
Evolution Sequence

The results from Hubble Space Telescope's Medium Deep Survey and Deep Fields indicate that there exists far more blue spiral galaxies at the intermediate and high redshifts than at the present epoch. A natural question therefore is: what have become of these excess late type galaxies as the Universe aged?

Near-infrared disk parameters in late-type spiral galaxies

1988 ◽  
Vol 95 ◽  
pp. 408 ◽  
Author(s):  
C. Giovanardi ◽  
L. K. Hunt
Keyword(s):  
Near Infrared ◽  
Spiral Galaxies ◽  
Late Type

Radio continuum observations of early- and late-type spiral galaxies

1987 ◽  
Vol 63 ◽  
pp. 771 ◽  
Author(s):  
Isabella M. Gioia ◽  
Giuseppina Fabbiano
Keyword(s):  
Spiral Galaxies ◽  
Radio Continuum ◽  
Late Type

scholarly journals IR imaging of spiral galaxy bulges

1993 ◽  
Vol 153 ◽  
pp. 441-442
Author(s):  
Dennis Zaritsky ◽  
Marcia Rieke ◽  
Hans-Walter Rix
Keyword(s):  
Spiral Galaxy ◽  
Stellar Population ◽  
Spiral Galaxies ◽  
Spiral Arms ◽  
Ir Imaging ◽  
The Impact

Imaging in the infrared (2.2μ) minimizes the impact of dust obscuration and allows reliable mapping of the mass-tracing stellar population in spiral galaxies. We find dramatic differences compared to photometry at shorter wavelengths (e.g. 0.8μ). As an example, the observations of the mini-bar and inner spiral arms of M 51 are discussed.

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