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The Redshift Evolution of Bulges and Disks of Spiral Galaxies in COSMOS

Sheth, Kartik and Spalsbury, Lori and Scoville, Nick (2008) The Redshift Evolution of Bulges and Disks of Spiral Galaxies in COSMOS. In: Pathways Through an Eclectic Universe. ASP Conference Series. Vol.390. Astronomical Society of the Pacific , San Francisco, CA, pp. 426-430. ISBN 978-1-58381-650-9.

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We present a preliminary analysis of the bulge and disk properties for a sample of over 4000 L* spiral galaxies at z < 0.84 from the COSMOS 2 square degree survey. We find that for early Hubble type spiral galaxies (Sa–Sb), the bulge-to-disk ratio is roughly constant over the last 7 Gyr of lookback time. This suggests that bulges of early type spirals were in place early on, consistent with other downsizing signatures. There is a monotonic increase in the bulge-to-disk ratios of late type spirals but that likely reflects the well-known decline in the star formation rate from z ~ 1 to the present. For this sample of L* spirals, we also find that the median exponential scale length of disks remains unchanged at 3.1 kpc from z = 0.0 to z = 0.84.

Item Type:Book Section
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URLURL TypeDescription
Sheth, Kartik0000-0002-5496-4118
Scoville, Nick0000-0002-0438-3323
Additional Information:© 2008 Astronomical Society of the Pacific.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Series Name:ASP Conference Series
Record Number:CaltechAUTHORS:20100730-094247493
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19224
Deposited On:02 Aug 2010 03:41
Last Modified:03 Oct 2019 01:54

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