Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-02
Astrophys.J.659:1176-1197,2007
Astronomy and Astrophysics
Astrophysics
11 pages, 17 figures, 3 tables, ApJ accepted, abridged abstract below. Minor changes and shortened paper for ApJ limits. For h
Scientific paper
10.1086/512355
Critical insights on galaxy evolution stem from the study of bars. With the advent of HST surveys that trace bars in the rest-frame optical out to z~1, it is critical to provide a reference baseline for bars at z~0 in the optical band. We present results on bars at z~0 in the optical and NIR bands based on 180 spirals from OSUBSGS. (1) The deprojected bar fraction at z~0 is ~60% +/-6% in the NIR H-band and ~44% +/-6% in the optical B-band. (2) The results before and after deprojection are similar, which is encouraging for high-redshift studies that forego deprojection. (3) Studies of bars at z~0.2-1.0 (lookback time of 3-8 Gyr) have reported an optical bar fraction of ~30% +/-6%, after applying cutoffs in absolute magnitude (M_V < -19.3), bar size (a_bar >= 1.5 kpc), and bar ellipticity (e_bar >= 0.4). Applying these exact cutoffs to the OSUBSGS data yields a comparable optical B-band bar fraction at z~0 of ~ 34%+/-6%. This rules out scenarios where the optical bar fraction in bright disks declines strongly with redshift. (4) Most (~70%) bars have moderate to high strentgh or ellipticity (0.50 <= e_bar <= 0.75). There is no bimodality in the distribution of e_bar. The H-band bar fraction and e_bar show no substantial variation across RC3 Hubble types Sa to Scd. (5) RC3 bar types should be used with caution. Many galaxies with RC3 types "AB" turn out to be unbarred and RC3 bar classes "B" and "AB" have a significant overlap in e_bar. (6) Most bars have sizes below 5 kpc. Bar and disk sizes correlate, and most bars have a_bar/R_25~0.1-0.5. This suggests that the growths of bars and disks are intimately tied.
Jogee Shardha
Marinova Irina
No associations
LandOfFree
Characterizing Bars at z~0 in the optical and NIR: Implications for the Evolution of Barred Disks with Redshift 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 Characterizing Bars at z~0 in the optical and NIR: Implications for the Evolution of Barred Disks with Redshift, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characterizing Bars at z~0 in the optical and NIR: Implications for the Evolution of Barred Disks with Redshift will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-265205