Search Publications
Dissecting the size evolution of elliptical galaxies since z∼ 1: puffing-up versus minor-merging scenarios
Trujillo, Ignacio; Ferreras, Ignacio; de La Rosa, Ignacio G.
At a fixed stellar mass, the size of low-redshift early-type galaxies is found to be a factor of 2 larger than that of their counterparts at z∼ 1, a result with important implications for galaxy formation models. In this paper, we have explored the buildup of the local mass-size relation of elliptical galaxies using two visually classified samples…
Herschel-ATLAS Galaxy Counts and High-redshift Luminosity Functions: The Formation of Massive Early-type Galaxies
Rodighiero, G.; Clements, D. L.; Danese, L. +35 more
Exploiting the Herschel Astrophysical Terahertz Large Area Survey Science Demonstration Phase survey data, we have determined the luminosity functions (LFs) at rest-frame wavelengths of 100 and 250 µm and at several redshifts z >~ 1, for bright submillimeter galaxies with star formation rates (SFRs) >~ 100 M ⊙ yr-1
The Sun as a star: observations of white-light flares
Kretzschmar, M.
Context. Solar flares radiate energy at all wavelengths, but the spectral distribution of this energy is still poorly known. White-light continuum emission is sometimes observed, and these flares are then called "white-light flares" (WLFs).
Aims: We investigate if all flares are WLFs and how the radiated energy is distributed spectrally.
…
Wide-field Precision Kinematics of the M87 Globular Cluster System
Spitler, Lee R.; Romanowsky, Aaron J.; Brodie, Jean P. +6 more
We present the most extensive combined photometric and spectroscopic study to date of the enormous globular cluster (GC) system around M87, the central giant elliptical galaxy in the nearby Virgo Cluster. Using observations from DEIMOS and the Low Resolution Imaging Spectrometer at Keck, and Hectospec on the Multiple Mirror Telescope, we derive ne…
A New Cepheid Distance to the Giant Spiral M101 Based on Image Subtraction of Hubble Space Telescope/Advanced Camera for Surveys Observations
Stanek, K. Z.; Shappee, Benjamin J.
We accurately determine a new Cepheid distance to M101 (NGC 5457) using archival Hubble Space Telescope (HST)/Advanced Camera for Surveys V and I time series photometry of two fields within the galaxy. We make a slight modification to the ISIS image subtraction package to obtain optimal differential light curves from HST data. We discovered 827 Ce…
Shocks and Cavities from Multiple Outbursts in the Galaxy Group NGC 5813: A Window to Active Galactic Nucleus Feedback
Simionescu, A.; Churazov, E.; Giacintucci, S. +10 more
We present results from new Chandra, GMRT, and SOAR observations of NGC 5813, the dominant central galaxy in a nearby galaxy group. The system shows three pairs of collinear cavities at 1 kpc, 8 kpc, and 20 kpc from the central source, from three distinct outbursts of the central active galactic nucleus (AGN), which occurred 3 × 106, 2 …
Gas and Dust in a Submillimeter Galaxy at z = 4.24 from the Herschel Atlas
Valtchanov, I.; Ivison, R. J.; Menten, K. M. +39 more
We report ground-based follow-up observations of the exceptional source, ID 141, one of the brightest sources detected so far in the Herschel Astrophysical Terahertz Large Area Survey cosmological survey. ID 141 was observed using the IRAM 30 m telescope and Plateau de Bure interferometer (PdBI), the Submillimeter Array, and the Atacama Pathfinder…
On the evolution of the velocity-mass-size relations of disc-dominated galaxies over the past 10 billion years
Koekemoer, Anton M.; Weiner, Benjamin J.; van den Bosch, Frank C. +10 more
We study the evolution of the scaling relations between the maximum circular velocity, stellar mass and optical half-light radius of star-forming disc-dominated galaxies in the context of Λ cold dark matter-based galaxy formation models. Using data from the literature combined with new data from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) …
Building the cosmic infrared background brick by brick with Herschel/PEP
Berta, S.; Magnelli, B.; Nordon, R. +24 more
The cosmic infrared background (CIB) includes roughly half of the energy radiated by all galaxies at all wavelengths across cosmic time, as observed at the present epoch. The PACS Evolutionary Probe (PEP) survey is exploited here to study the CIB and its redshift differential, at 70, 100 and 160 µm, where the background peaks. Combining PACS…
Constraints on the Assembly and Dynamics of Galaxies. I. Detailed Rest-frame Optical Morphologies on Kiloparsec Scale of z ~ 2 Star-forming Galaxies
Förster Schreiber, N. M.; Genzel, R.; Cresci, G. +5 more
We present deep and high-resolution Hubble Space Telescope NIC2 F160W imaging at 1.6 µm of six z ~ 2 star-forming galaxies with existing near-infrared integral field spectroscopy from SINFONI at the Very Large Telescope. The unique combination of rest-frame optical imaging and nebular emission-line maps provides simultaneous insight into mor…