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STAGES: the Space Telescope A901/2 Galaxy Evolution Survey
M. E. Gray, Christian Wolf, Marco Barden +26
We present an overview of the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). STAGES is a multiwavelength project designed to probe physical drivers of galaxy evolution ac…
The STAGES view of red spirals and dusty red galaxies: Mass-dependent quenching of star-formation in cluster infall
Christian Wolf, Alfonso Aragon-Salamanca, Michael Balogh +22
We investigate the properties of optically passive spirals and dusty red galaxies in the A901/2 cluster complex at redshift ~0.17 using restframe near-UV-optical SEDs, 24 micron IR…
Eddington ratios of faint AGN at intermediate redshift: Evidence for a population of half-starved black holes
I. Gavignaud, L. Wisotzki, A. Bongiorno +51
We use one of the deepest spectroscopic samples of broad line active galactic nuclei (AGN) currently available, extracted from the VIMOS VLT Deep Survey (VVDS), to compute MgII and…
Near-Infrared spectral diagnostics for unresolved stellar population galaxies
M. Cesetti, V. D. Ivanov, L. Morelli
We want to develop spectral diagnostics of stellar populations in the near-infrared (NIR), for unresolved stellar populations. We created a semi-empirical population model and we c…
Obscured star formation in intermediate-density environments: A Spitzer study of the Abell 901/902 supercluster
A. Gallazzi, E. F. Bell, C. Wolf +23
We explore the amount of obscured star-formation as a function of environment in the A901/902 supercluster at z=0.165 in conjunction with a field sample drawn from the A901 and CDF…
Extended emission-line regions in low-redshift quasars: Dependence on nuclear spectral properties
B. Husemann, L. Wisotzki, S. F. Sánchez +1
We searched for the presence of extended emission-line regions (EELRs) around low-redshift QSOs. We observed a sample of 20 mainly radio-quiet low-redshift quasars (z<0.3) by means…
An unbiased measurement of the UV background and its evolution via the proximity effect in quasar spectra
Aldo Dall'Aglio, Lutz Wisotzki, Gabor Worseck
We used 40 high resolution, high S/N QSO spectra at 2.1<z<4.7 to search for the signature of the proximity effect in the HI Lyalpha forest. Comparing the effective optical depth ne…
A slitless spectroscopic survey for quasars near quasars
G. Worseck, L. Wisotzki, F. Selman
We present the results of the Quasars near Quasars (QNQ) survey, a CCD-based slitless spectroscopic survey for faint V<22 quasars at 1.7<z<3.6 on 18 26.2'x33.5' fields centred on b…
The stellar content of the Hamburg/ESO survey. IV. Selection of candidate metal-poor stars
N. Christlieb, T. Schoerck, A. Frebel +3
We present the quantitative methods used for selecting candidate metal-poor stars in the Hamburg/ESO objective-prism survey (HES). The selection is based on the strength of the Ca…
Exploring the Impact of Galaxy Interactions over Seven Billion Years with CAS
Sarah H. Miller, S. Jogee, C. Conselice +22
We explore galaxy assembly over the last seven billion years by characterizing "normal" galaxies along the Hubble sequence, against strongly disturbed merging/interacting galaxies…
Characterizing Barred Galaxies in the Abell 901/902 Supercluster
I. Marinova, S. Jogee, D. Bacon +22
In dense clusters, higher densities at early epochs as well as physical processes, such as ram pressure stripping and tidal interactions become important, and can have direct conse…
Morphological Transformations of Galaxies in the A901/02 Supercluster from STAGES
A. L. Heiderman, S. Jogee, D. J. Bacon +23
We present a study of galaxies in the Abell 901/902 Supercluster at z~0.165, based on HST ACS F606W, COMBO-17, Spitzer 24um, XMM-Newton X-ray, and gravitational lensing maps, as pa…
Frequency and Impact of Galaxy Mergers and Interactions over the last 7 Gyr
S. Jogee, S. Miller, K. Penner +21
We explore the history and impact of galaxy mergers and interactions over z~0.24 to 0.80, based on HST ACS, Combo-17, and Spitzer 24 mu data of ~4500 galaxies in the GEMS survey. U…
Galaxy Evolution in Dense Environments: Properties of Interacting Galaxies in the A901/02 Supercluster
A. L. Heiderman, S. Jogee, D. J. Bacon +23
We present a study of galaxies in the STAGES survey of the Abell 901/902 supercluster at z~0.165, based on HST ACS F606W, COMBO-17, Spitzer 24um, XMM-Newton X-ray, and gravitationa…
The time-delay of the gravitationally lensed double quasar UM 673
T. A. Akhunov, R. W. Schmidt, O. Burkhonov +11
The paper has been withdrawn because double checking and comparison with other data sets after the original submission showed that a broken R-band filter at the Maidanak telescope…
The dark matter environment of the Abell 901/902 supercluster: a weak lensing analysis of the HST STAGES survey
Catherine Heymans, Meghan E. Gray, Chien Y. Peng +21
We present a high resolution dark matter reconstruction of the z=0.165 Abell 901/902 supercluster from a weak lensing analysis of the HST STAGES survey. We detect the four main str…