Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-29
Astrophys.J. 592 (2003) L13-L16
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ Letters, 4 pages in emulate-apj style, includes 3 figures
Scientific paper
10.1086/377329
Previous optical studies found an unexpected deficit of bars at z > 0.7. To investigate the effects of bandshifting, we have studied the fraction of barred spirals in the NICMOS Deep Field North. At z > 0.7 we find at least four barred spirals, doubling the number previously detected. The number of barred galaxies is small because these (and previous) data lack adequate spatial resolution. A typical 5 kpc bar at z > 0.7 is only marginally detectable for WFPC2 at 0.8microns; the NICMOS data have even lower resolution and can only find the largest bars. The average size of the four bars seen at z > 0.7 is 12 kpc. The fraction of such large bars (4/95) is higher than that seen in nearby spirals (1/44); all known selection effects suggest that the observed fraction is a lower limit. However, important caveats such as small numbers and difficulties in defining comparable samples at high and low redshifts should be noted. We conclude that there is no significant evidence for a decrease in the fraction of barred spirals beyond z ~ 0.7.
Regan Michael W.
Scoville Nick
Sheth Kartik
Strubbe Linda
No associations
LandOfFree
Barred Galaxies at z > 0.7: NICMOS HDFN Observations 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 Barred Galaxies at z > 0.7: NICMOS HDFN Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Barred Galaxies at z > 0.7: NICMOS HDFN Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-606718