The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals

Details The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..197r&link_type=abstract

XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S

Astronomy and Astrophysics

Astronomy

Scientific paper

There are strong evidences that early-type galaxies contain stellar populations younger than their dominant old populations indicating that galaxies with this morphology weren't completely formed at the same time in a remote past. This process continues until a more recent epoch which would give support to the hierarchical scenario for galaxy formation. We analyzed a different alternative involving the role of rotational support in the collapse scenario, keeping the idea that the bulk of galaxies formation may occur in a more remote past, but including the rotation as an agent that hinders the complete transformation of primordial gas into stars by forming a disk, which later, secularly, carries material into the bulges. On the other hand, objects with non rotational support converted essentially all of its primordial gas into stars.
We have compared M_g{_{2}} - σ relations for about 1000 E and S0 galaxies, discriminating sub-samples in these morphologies and relative importance of rotation (V_{rot}/σ < 0.4 and V_{rot}/σ > 0.4 for 300 galaxies) and found differences, basically associated to the rotational support. Objects with negligible rotation compared to velocity dispersion define a flatter M_g{_{2}} - σ relation with homogeneous scatter, which we considered as a standard to represent the non rotational support case. For galaxies with important rotation, the relation scatter presents an excess of negative residuals relative to the standard mention above and shows an apparent correlation with the rotational support V_{rot}/σ.
The scenario extends adequately to 160 bulges of spirals as a natural extension to objects with increasing importance of rotation.

Affiliated with

Also associated with

No associations

Rating

The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Role of Rotation on the Mg[2] - σ Relation of Early-Type Galaxies and Bulges of Spirals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1479215