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Quenching Star Formation in the Green Valley: The Mass Flux at Intermediate Redshifts

Gonçalves, Thiago S. and Martin, D. Christopher (2010) Quenching Star Formation in the Green Valley: The Mass Flux at Intermediate Redshifts. In: Stellar populations : planning for the next decade : proceedings of the 262th [sic] symposium of the International Astronomical Union held in Rio de Janeiro, Brasil, August 3-7, 2009. IAU symposium and colloquium proceedings series. No.262. Cambridge University Press , Cambridge [England], pp. 261-264. ISBN 9780521764841.

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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.

Item Type:Book Section
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Martin, D. Christopher0000-0002-8650-1644
Additional Information:© 2010 International Astronomical Union.
Group:Space Astrophysics Laboratory
Subject Keywords:galaxies: evolution; galaxies: general
Series Name:IAU symposium and colloquium proceedings series
Issue or Number:262
Record Number:CaltechAUTHORS:20101103-090116060
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Official Citation:Gonçalves, T. S. and D. C. Martin (2009). "Quenching Star Formation in the Green Valley: The Mass Flux at Intermediate Redshifts." Proceedings of the International Astronomical Union 5(Symposium S262): 261-264.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20645
Deposited By: Tony Diaz
Deposited On:06 Dec 2010 20:07
Last Modified:09 Mar 2020 20:55

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