Quenching Star Formation in the Green Valley: The Mass Flux at Intermediate Redshifts
Abstract
We have obtained several hundred very deep spectra with DEIMOS/Keck in order to estimate the galactic mass flux density at intermediate redshifts (0.6 < z < 0.9) from the "blue cloud" to the red sequence across the so-called "green valley", the intermediate region in the color-magnitude plot between those two populations. We use spectral indices (specifically D_n (4000) and H_(δ,A)) to determine star formation histories. Together with an independent measurement of number density of galaxies in each bin of the color-magnitude plot, one can infer the rate at which galaxies from a given sample are transiting through that bin. Measuring this value for all magnitude values, studies at lower redshift determined that the mass flux density in the green valley is comparable to both the mass build-up rate of the red sequence and the mass loss rate from the blue cloud. We show preliminary results for our intermediate redshift sample.
Additional Information
© 2010 International Astronomical Union.Attached Files
Published - Goncalves2010p11741Ages_Of_Stars.pdf
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Additional details
- Eprint ID
- 20645
- Resolver ID
- CaltechAUTHORS:20101103-090116060
- Created
-
2010-12-06Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Space Astrophysics Laboratory
- Series Name
- IAU symposium and colloquium proceedings series
- Series Volume or Issue Number
- 262