output
19912026
Showing 2011 · astro-ph.COShow all

137 papers · 2 filters

astro-ph.CO2011★ 69 cited

Dissecting early-type dwarf galaxies into their multiple components

J. Janz, E. Laurikainen, T. Lisker +8

Early-type dwarf galaxies, once believed to be simple systems, have recently been shown to exhibit an intriguing diversity in structure and stellar content. To analyze this further…

astro-ph.CO2011★ 68 cited

VERITAS Observations of day-scale flaring of M87 in 2010 April

E. Aliu, T. Arlen, T. Aune +88

VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days wa…

astro-ph.CO2011★ 113 cited

The ongoing assembly of a central cluster galaxy: Phase-space substructures in the halo of M87

Aaron J. Romanowsky, Jay Strader, Jean P. Brodie +5

The halos of galaxies preserve unique records of their formation histories. We carry out the first combined observational and theoretical study of phase-space halo substructure in…

astro-ph.CO2011★ 19 cited

The Role of Galaxy Interaction in Environmental Dependence of the Star Formation Activity at z~1.2

Yuko Ideue, Yoshiaki Taniguchi, Tohru Nagao +9

In order to understand environmental effects on star formation in high-redshift galaxies, we investigate the physical relationships between the star formation activity, stellar mas…

astro-ph.CO2011★ 48 cited

Luminous and High Stellar Mass Candidate Galaxies at z ~ 8 Discovered in CANDELS

Haojing Yan, Steven L. Finkelstein, Kuang-Han Huang +26

One key goal of the Hubble Space Telescope Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey is to track galaxy evolution back to z ~ 8. Its two-tiered "wide and deep"…

astro-ph.CO2011★ 30 cited

Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems

Lee R. Spitler, Aaron J. Romanowsky, Jürg Diemand +4

Exploiting a fundamental characteristic of galaxy assembly in the ΛCDM paradigm, the observed spatial biasing and kinematics of metal-poor globular star clusters are used to constr…

astro-ph.CO2011★ 143 cited

MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z=0

Greg Stinson, Chris Brook, J. Xavier Prochaska +8

We explore the circumgalactic medium (CGM) of two simulated star-forming galaxies with luminosities L ~ 0.1 and 1 L* generated using the smooth particle hydrodynamic code GASOLINE.…

astro-ph.CO2011★ 164 cited

The SPLASH Survey: Spectroscopy of 15 M31 Dwarf Spheroidal Satellite Galaxies

Erik J. Tollerud, Rachael L. Beaton, Marla C. Geha +13

We present a resolved-star spectroscopic survey of 15 dwarf spheroidal (dSph) satellites of the Andromeda Galaxy (M31) as part of the Spectroscopic and Photometric Landscape of And…

astro-ph.CO2011★ 203 cited

Halo expansion in cosmological hydro simulations: towards a baryonic solution of the cusp/core problem in massive spirals

Andrea V. Maccio', Greg Stinson, Chris B. Brook +5

A clear prediction of the Cold Dark Matter model is the existence of cuspy dark matter halo density profiles on all mass scales. This is not in agreement with the observed rotation…

astro-ph.CO2011★ 60 cited

The First Observations of Low-Redshift Damped Lyman-α Systems with the Cosmic Origins Spectrograph: Chemical Abundances and Affiliated Galaxies

A. J. Battisti, J. D. Meiring, T. M. Tripp +6

We present Cosmic Origins Spectrograph (COS) measurements of metal abundances in eight 0.083<z<0.321 damped Lyman-α(DLA) and sub-damped Ly-α absorption systems serendipitously disc…

astro-ph.CO2011★ 82 cited

Overdensities of Y-dropout Galaxies from the Brightest-of-Reionizing Galaxies Survey: A Candidate Protocluster at Redshift z~8

M. Trenti, L. D. Bradley, M. Stiavelli +8

Theoretical and numerical modeling of dark-matter halo assembly predicts that the most luminous galaxies at high redshift are surrounded by overdensities of fainter companions. We…

astro-ph.CO2011

An empirical approach to the extragalactic background light from AEGIS galaxy SED-type fractions

Alberto Domínguez

The extragalactic background light (EBL) is of fundamental importance both for understanding the entire process of galaxy evolution and for gamma-ray astronomy. However, the overal…

astro-ph.CO2011★ 158 cited

The Hidden Mass and Large Spatial Extent of a Poststarburst Galaxy Outflow

Todd M. Tripp, Joseph D. Meiring, J. Xavier Prochaska +9

Outflowing winds of multiphase plasma have been proposed to regulate the buildup of galaxies, but key aspects of these outflows have not been probed with observations. Using ultrav…

astro-ph.CO2011★ 570 cited

The Large, Oxygen-Rich Halos of Star-Forming Galaxies Are A Major Reservoir of Galactic Metals

Jason Tumlinson, Christopher Thom, Jessica K. Werk +11

The circumgalactic medium (CGM) is fed by galaxy outflows and accretion of intergalactic gas, but its mass, heavy element enrichment, and relation to galaxy properties are poorly c…

astro-ph.CO2011★ 45 cited

Fe K emission from active galaxies in the COSMOS field

K. Iwasawa, V. Mainieri, M. Brusa +14

We present a rest-frame spectral stacking analysis of ~1000 X-ray sources detected in the XMM-COSMOS field in order to investigate the iron K line properties of active galaxies bey…

astro-ph.CO2011★ 180 cited

Detection of Pristine Gas Two Billion Years after the Big Bang

Michele Fumagalli, John M. O'Meara, J. Xavier Prochaska

In the current cosmological model, only the three lightest elements were created in the first few minutes after the Big Bang; all other elements were produced later in stars. To da…

astro-ph.CO2011★ 187 cited

The X-ray cluster survey with eROSITA: forecasts for cosmology, cluster physics and primordial non-Gaussianity

Annalisa Pillepich, Cristiano Porciani, Thomas H. Reiprich

Starting in late 2013, the eROSITA telescope will survey the X-ray sky with unprecedented sensitivity. Assuming a detection limit of 50 photons in the (0.5-2.0) keV energy band wit…

astro-ph.CO2011★ 188 cited

The 2010 very high energy gamma-ray flare & 10 years of multi-wavelength observations of M 87

The H. E. S. S. Collaboration, :, A. Abramowski +442

Abridged: The giant radio galaxy M 87 with its proximity, famous jet, and very massive black hole provides a unique opportunity to investigate the origin of very high energy (VHE;…

astro-ph.CO2011★ 80 cited

Clustering properties of BzK-selected galaxies in GOODS-N: environmental quenching and triggering of star formation at z ~ 2

Lihwai Lin, Mark Dickinson, Hung-Yu Jian +19

Using a sample of BzK-selected galaxies at z~2 identified from the CFHT/WIRCAM near-infrared survey of GOODS-North, we discuss the relation between star formation rate (SFR), speci…

astro-ph.CO2011★ 35 cited

Kinematic properties of the field elliptical NGC 7507

R. Salinas, T. Richtler, L. P. Bassino +2

The dark matter (DM) halos of field elliptical galaxies have not been well studied and their properties appear controversial. While some galaxies appear to be nearly devoid of DM,…

astro-ph.CO2011

The XMM-BCS galaxy cluster survey: I. The X-ray selected cluster catalog from the initial 6 deg

R. Šuhada, J. Song, H. Böhringer +19

The XMM-Newton - Blanco Cosmology Survey project (XMM-BCS) is a coordinated X-ray, optical and mid-infrared cluster survey in a field also covered by Sunyaev-Zel'dovich effect surv…

astro-ph.CO2011★ 106 cited

The Lick AGN Monitoring Project 2011: Reverberation Mapping of Markarian 50

A. J. Barth, A. Pancoast, S. J. Thorman +46

The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in Spring 2011. Here we present the first results from this program, a measureme…

astro-ph.CO2011★ 38 cited

The Hubble Space Telescope Cluster Supernova Survey: VI. The Volumetric Type Ia Supernova Rate

K. Barbary, G. Aldering, R. Amanullah +40

We present a measurement of the volumetric Type Ia supernova (SN Ia) rate out to z ~ 1.6 from the Hubble Space Telescope Cluster Supernova Survey. In observations spanning 189 orbi…

astro-ph.CO2011★ 68 cited

The Rest Frame UV to Optical Colors and SEDs of z~4-7 Galaxies

Valentino Gonzalez, Rychard Bouwens, Ivo Labbe +4

We use the ultra-deep HUDF09 and the deep ERS data from the HST WFC3/IR camera, along with the wide area Spitzer/IRAC data from GOODS-S to derive SEDs of star-forming galaxies from…