Publications 2007

Ongoing Research

Publications 2007

• 
  De Lucia, G. et al. (EDisCS), 2007,
  The Build-Up of the Colour-Magnitude Relation in Galaxy Clusters Since
  z ~ 0.8,  MNRAS, 374, 809
  (extragalactic, observational)
  
  Desai, V., et al. (EDisCS), 2007
  The Morphological Content of Ten EDisCS Clusters at 0.5 < z < 0.8,
  ApJ 660, 1151
  (extragalactic, observational)
  
  Zaritsky, D. and Christlein, D. 2007
  On the Extended Knotted Disks of Galaxies, AJ 134, 135
  (extragalactic, observational)
  
  Gonzalez, A.H., Zaritsky, D, and Zabludoff, A.I. 2007,
  A Census of Baryons in Galaxy Clusters and Groups ApJ 666, 147
  (extragalactic, observational)
  
  Gonzalez, Anthony H.; Zaritsky, Dennis, and  Zabludoff, Ann I. 2007,
  A Census of Baryons in Galaxy Clusters and Groups IAU, 244, 167
  (extragalactic, observational)
  
  Zaritsky, Dennis and Christlein, Daniel 2007,
  The Outer Banks of Galaxy Disks in Island Universe
  (extragalactic, observational)
  
  Herbert-Fort, Stephane; Zaritsky, Dennis; Kim, Yeun Jin; Bailin,
  Jeremy; Taylor, James E. 2007,  Rotation of Galaxy Dark Matter Halos, IAU
  235, 104
  (extragalactic, observational)
                                                                                  
  

Ongoing Research

    D. Zaritsky is involved in a large collaborative project led
    by S.D.M. White (MPA) to use the VLT and NTT telescopes to study
    subsamples of 10 clusters at a redshift of 0.5 and 10 clusters at a
    redshift of 0.8 drawn from the Las Campanas Distant Cluster Survey.
    We have completed data collection. D. Zaritsky is leading the X-ray
    observations of these clusters. The goals of this program are
    numerous but center on the study of the evolution of galaxies
    and galaxy clusters.
    (extragalactic, observational)

    D. Zaritsky is part of a large collaboration (SAGE lead by M. Meixner
    at STScI) that has undertaken a complete survey of the Large
    Magellanic Cloud with both IRAC and MIPS on Spitzer. The aims are
    many, but Zaritsky's interests lie in exploring the nature of dust
    and connection with extinction,
    the recent star formation patterns, and the distribution of old stars.
    (galactic, observational)

    D. Zaritsky is part of a large collaboration (ANGST lead by J.
    Dalcanton at U. Washington)that has just started a large
    observational program with the HST to measure the star formation
    histories of galaxies in the local universe. We will track
    99% of the star formation within the nearest few Mpc with the goal
    of understanding how star formation progressed in a representative
    piece of the Universe.
    (extragalactic, observational)      

    D. Zaritsky, in collaboration with A. Gonzalez (U.Florida), and
    A. Zabludoff (Steward) is extending galactic scaling laws to all
    galaxies. (extragalactic, observational)

    D. Zaritsky, in collaboration with A. Gonzalez (U.Florida),
    A. Zabludoff, and Suresh Sivanandam (Steward), is studying how
    the intracluster stars affect the chemical abundance evolution of
    the intracluster medium. (extragalactic, observational)

    D. Zaritsky, in collaboration with R. Finn (UMASS), M. Balogh (Waterloo)
    Bob Nichol (Portsmouth), and C. Miller (NOAO), is measuring the star
    formation rates of galaxies in nearby clusters for comparison to results
    obtained for distant clusters. (extragalactic, observational)

    D. Zaritsky with J. Harris (NOAO) is measuring the star
    formation history and chemical enrichment history of
    the Large Magellanic Cloud by reconstructing color-magnitude
    diagrams from the Magellanic Clouds Photometric Survey.
    (Galactic, Observational).

    D. Zaritsky (in collaboration with J. Harris (NOAO) and Stephane
    Herbert-Fort (Steward) and Knut Olsen (NOAO) is measuring the
    kinematic properties of a large (~10000 stars) sample of stars
    to determine the dynamical status of the Large Magellanic Cloud.
    (Galactic, Observational).

    D. Zaritsky, D. Clowe (Ohio), A. Gonzalez (U. Florida), M.
    Bradac (Stanford) and M. Markevitch (CfA) are using weak lensing
    of merging clusters to constrain the interaction cross-section of
    dark matter. We are also using optical spectroscopy and Spitzer
    imaging to measure the effect of the cluster interaction on star
    formation rates. (extragalactic, observational)

    D. Zaritsky, Y. Yang (graduate student, Steward), and A. Zabludoff
    (Steward) are using HST imaging to study E+A galaxies. In particular,
    we aim to use the colors of star clusters to measure the age since
    the burst of star formation. (extragalactic, observational)

    D. Zaritsky, D. Christlein (MPA), S. Kannappan (UNC), and
    Stephane Herbert-Fort (Steward) are studying outer disk kinematics by
    observing HII regions well beyond the star formation threshold radius.
    Observations of edge-on and face-on galaxies will be combined to
    constrain the angular momentum and mass density of the outer disks
    of galaxies. (extragalactic, observational)


    D. Zaritsky, D. Clowe (Ohio), and J. Willhem (Ohio undergrad)
    are using photometric redshifts and Hectospec observations
    to identify the filamentary structure
    around massive clusters at intermediate redshifts.
    (extragalactic, observational)

    D. Zaritsky, J. Moustakas (NYU), and the AGES collaboration are
    measuring the mass-metallicity relation of galaxies out to a redshift
    of about 0.8. This will be the largest sample of abundance measurements
    beyond the local Universe. (extragalactic, observational)

    D. Zaritsky in collaboration with D. Sand, S. Herbert-Fort, and
    S. Sivanadam (Steward) is measuring the supernovae rate in nearby
    clusters to better understand the chemical enrichment process.
    This program has now expanded to the CFHT in a collaboration with
    H. Hoekstra (Leiden) and C. Pritchet (UBC).
    (extragalactic, observational)

    D. Zaritsky in collaboration with A. Gonzalez (Florida), S. Kautsch
    (Florida) and K.-V. Tran (Texas A&M) is studying galaxy evolution in a
    collapsing set of galaxy groups to explore the pre-processing of
    galaxies prior to cluster assembly. (extragalactic, observational)

    D. Zaritsky in collaboration with J. Harris (NOAO) is developing
    a new technique to reconstruct star formation histories of galaxies.
    (extragalactic, observational)

    D. Zaritsky in collaboration with B. Willman (CfA/Haverford), D. Sand (Ste\ward),
    and J. Harris (NOAO) is measuring the star formation properties of the
    faintest/smallest dwarf galaxies yet known in order to better
    understand the star formation properties of low mass halos.
    (extragalactic, observational)
                                   

    D. Zaritsky and J. Moustakas (NYU) are observing the  4959 vs. 5007\ A
    splitting as a function of redshift to constrain the evolution of the
    fine structure constant.

    D. Zaritsky, in collaboration with D. Just (Steward grad. student), and
    D. Sand (Steward), is measuring the evolution of S0 fraction in galaxy
    clusters with redshift. In particular, he is attempting to determine
    whether the observed relation is driven primarily by the mass of the clust\er
    rather than by the redshift.