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Related papers: A SALT Spectral Study of S0s Hosting Pseudobulges

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We study the recent star formation histories of local galaxies by analyzing the scatter in their colours and spectral properties. We present evidence that the distribution of star formation histories changes qualitatively above a…

Rich galaxy clusters in the local Universe show a large population of S0 galaxies (~ 40%) of all luminous galaxies). With increasing redshift the fraction of this S0 galaxy population is observed to strongly decrease (e.g. by a factor ~2-3…

Astrophysics · Physics 2009-11-07 J. Bicker , U. Fritze - v. Alvensleben , K. J. Fricke

We continue the exploration of the BaLROG (Bars in Low Redshift Optical Galaxies) sample: 16 large mosaics of barred galaxies observed with the integral field unit SAURON. We quantify the influence of bars on the composition of the stellar…

We present a systematic observational study of the relationship between bars and boxy/peanut-shaped (B/PS) bulges. We first review and discuss proposed mechanisms for their formation, focussing on accretion and bar-buckling scenarios. Using…

Astrophysics · Physics 2009-10-31 M. Bureau , K. C. Freeman

We present a new database of our two-dimensional bulge-disk decompositions for 14,233 galaxies drawn from SDSS DR12 in order to examine the properties of bulges residing in the local universe ($0.005 < z < 0.05$). We performed…

Astrophysics of Galaxies · Physics 2016-07-20 Keunho Kim , Sree Oh , Hyunjin Jeong , Alfonso Aragon-Salamanca , Rory Smith , Sukyoung K. Yi

More than half of nearby disc galaxies have pseudobulges instead of classical bulges that are though to be end-products of galaxy mergers. Pseudobulges are presumed to develop overtime as a result of secular evolution of galaxy discs. We…

Cosmology and Nongalactic Astrophysics · Physics 2012-12-11 Takashi Okamoto

We have estimated the bulge-to-total ($B/T$) light ratios in the $K_s$-band for a sample of 24 S0, S0/a and Sa galaxies by applying a 2-dimensional multicomponent decomposition method. For the disk an exponential function is used, the…

Astrophysics · Physics 2009-11-13 Eija Laurikainen , Heikki Salo , Ronald Buta

It has been suggested that the bulge-to-total stellar mass ratio or feedback from black holes (BHs), traced by the BH-to-(total stellar) mass ratio, might establish a galaxy's specific star formation rate (sSFR). We reveal that a galaxy's…

Astrophysics of Galaxies · Physics 2023-12-15 Alister W. Graham , T. H. Jarrett , M. E. Cluver

We use 3.6 $\mu$m photometry from the Spitzer Survey of Stellar Structure in Galaxies (S$^{4}$G) to trace the stellar distribution in nearby disk galaxies ($z\approx0$) with total stellar masses $10^{8.5}\lesssim…

Astrophysics of Galaxies · Physics 2016-12-07 Simón Díaz-García , Heikki Salo , Eija Laurikainen

The properties of stellar populations in the centers of 54 nearby lenticular galaxies are investigated by means of 2D spectroscopy, with the Multi-Pupil Spectrograph of the 6m telescope of SAO RAS; the unresolved nuclei and their…

Astrophysics · Physics 2009-11-10 Olga K. Silchenko

We present structural parameters and (g-i) bulge/disk colors for a large sample (189) of isolated AMIGA galaxies. The structural parameters of bulges were derived from the 2D bulge/disk/bar decomposition of SDSS i-band images using GALFIT.…

Double-barred galaxies account for almost one third of all barred galaxies, suggesting that secondary stellar bars, which are embedded in large-scale primary bars, are long-lived structures. However, up to now it has been hard to…

Astrophysics of Galaxies · Physics 2015-06-23 Herve Wozniak

(Abridged) Star-forming nuclear rings in barred galaxies are common in nearby spirals, and their detailed study can lead to important insights into the evolution of galaxies, their bars, and their central regions. We present integral field…

Astrophysics · Physics 2009-11-11 Emma L. Allard , Johan H. Knapen , Reynier F. Peletier , Marc Sarzi

We study the structural properties of Low Surface Brightness galaxies (LSB) using a sample of 263 galaxies observed by the Green Bank Telescope (Schneider et al 1992). We perform 2D decompositions of these galaxies in the SDSS $g$, $r$ and…

Astrophysics of Galaxies · Physics 2018-05-16 Isha Pahwa , Kanak Saha

We study the colors and orientations of structures in low and intermediate inclination barred galaxies. We test the hypothesis that barlenses, roundish central components embedded in bars, could form a part of the bar in a similar manner to…

Astrophysics of Galaxies · Physics 2017-03-01 M. Herrera Endoqui , H. Salo , E. Laurikainen , J. H. Knapen

The fractions and dimension of bars, rings and lenses are studied in the Near-IR S0 galaxy Survey (NIRS0S). We find evidence that multiple lenses in some barred S0s are related to bar resonances in a similar manner as the inner and outer…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 E. Laurikainen , H. Salo , E. Athanassoula , A. Bosma , R. Buta , J. Janz

We present a study of star-forming galaxies (SFGs) with pseudobulges (bulges with S\'ersic index $\rm n < 2$) in a local close major-merger galaxy pair sample (H-KPAIR). With data from new aperture photometries in the optical and…

Astrophysics of Galaxies · Physics 2024-03-29 Chuan He , Cong Kevin Xu , Ute Lisenfeld , Y Sophia Dai , Taotao Fang , Jia-Sheng Huang , Wei Wang , Qingzheng Yu

We investigate the dependence of occurrence of bars in galaxies on galaxy properties and environment. We use a volume-limited sample of 33,391 galaxies brighter than $M_{r}=-19.5+5$log$h$ at $0.02\le z\le0.05489$, drawn from the SDSS DR 7.…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Gwang-Ho Lee , Changbom Park , Myung Gyoon Lee , Yun-Young Choi

Using HST observations of 147 host galaxies of low-mass black holes (BHs), we systematically study the structures and scaling relations of these active galaxies. Our sample is selected to have central BHs with virial masses ~10^5-10^6 solar…

Cosmology and Nongalactic Astrophysics · Physics 2011-11-09 Yan-Fei Jiang , Jenny E. Greene , Luis C. Ho , Ting Xiao , Aaron J. Barth