1.13. Structural characteristics of spiral bulges
نویسندگان
چکیده
منابع مشابه
Rejuvenation of spiral bulges
We seek to understand whether the stellar populations of galactic bulges show evidence of secular evolution triggered by the presence of the disc. For this purpose we re-analyse the sample of Proctor and Sansom, deriving stellar population ages and element abundances from absorption line indices as functions of central velocity dispersion and Hubble type. We obtain consistent constraints on age...
متن کاملConstraining the star formation histories of spiral bulges
Stellar populations in spiral bulges are investigated using the Lick system of spectral indices. Long-slit spectroscopic observations of line strengths and kinematics made along the minor axes of four spiral bulges are reported. Comparisons are made between central line strengths in spiral bulges and those in other morphological types [elliptical, spheroidal (Sph) and S0]. The bulges investigat...
متن کاملStar Clusters in Pseudo-bulges of Spiral Galaxies
We present a study of the properties of the star-cluster systems around pseudo-bulges of late-type spiral galaxies using a sample of 11 galaxies with distances from 17 to 37 Mpc. Star clusters are identified from multiband HST ACS and WFPC2 imaging data by combining detections in 3 bands (F435W and F814W with ACS and F606W with WFPC2). The photometric data are then compared to population synthe...
متن کاملAn Investigation into the Prominence of Spiral Galaxy Bulges
From a diameter-limited sample of 86 ‘face-on’ spiral galaxies, the bulge-to-disk size and luminosity ratios, and other quantitative measurements for the prominence of the bulge are derived. The bulge and disk parameters have been estimated using a seeing convolved Sérsic r bulge and a seeing convolved exponential disk which were fitted to the optical (B,R, and I) and near-infrared (K) galaxy l...
متن کاملThe Nature of Boxy/peanut-shaped Bulges in Spiral Galaxies
We present a systematic observational study of the relationship between bars and boxy/peanut-shaped (B/PS) bulges. We Ðrst review and discuss proposed mechanisms for their formation, focusing on accretion and bar-buckling scenarios. Using new methods relying on the kinematics of edge-on disks, we then look for bars in a large sample of edge-on spiral galaxies with a B/PS bulge and in a smaller ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900083923