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Galaxy-Scale Outflows Driven by Active Galactic Nuclei
Galaxy-Scale Outflows Driven Active Galactic Nuclei
2011/10/20
We present hydrodynamical simulations of major mergers of galaxies and study the effects of winds produced by active galactic nuclei (AGN) on interstellar gas in the AGN's host galaxy. Motivated by th...
Primordial Non-Gaussianity and Extreme-Value Statistics of Galaxy Clusters
Primordial Non-Gaussianity Extreme-Value Statistics Galaxy Clusters
2011/10/20
What is the size of the most massive object one expects to find in a survey of a given volume? In this paper, we present a solution to this problem using Extreme-Value Statistics. We calculate the pro...
Understanding Giant Radio Galaxy J1420-0545: Large-Scale Morphology, Environment, and Energetics
Understanding Giant Radio Galaxy J1420-0545: Large-Scale Morphology, Environment, and Energetics
2011/10/18
In this paper we consider the possibility that the structure of the largest radio galaxy J1420-0545 is formed by a restarted rather than a primary jet activity. This hypothesis is motivated by the unu...
SPIDER - V. Measuring Systematic Effects in Early-Type Galaxy Stellar Masses from Photometric SED Fitting
Measuring Systematic Effects Early-Type Galaxy Stellar Masses Photometric
2011/10/17
We present robust statistical estimates of the accuracy of early-type galaxy stellar masses derived from spectral energy distribution (SED) fitting as functions of various empirical and theoretical as...
Hubble Space Telescope Pixel Analysis of the Interacting Face-on Spiral Galaxy NGC 5194 (M51A)
Hubble Space Telescope Pixel Analysis Interacting Face-on Spiral Galaxy NGC 5194 (M51A)
2011/10/19
A pixel analysis is carried out on the interacting face-on spiral galaxy NGC 5194 (M51A), using the HST/ACS images in the F435W, F555W and F814W (BVI) bands. After 4x4 binning of the HST/ACS images to...
Fitting dwarf galaxy rotation curves with conformal gravity
Fitting dwarf galaxy rotation curves conformal gravity
2011/10/20
We continue our study of the application of the conformal gravity theory to galactic rotation curves. Previously we had studied a varied 111 spiral galaxy sample consisting of high surface brightness ...
Galaxy evolution in groups and clusters: star formation rates, red sequence fractions, and the persistent bimodality
methods: statistical-galaxies: groups: general-galaxies: clusters:general-galaxies: haloes-galaxies: evolution-galaxies: star formation
2011/10/17
Using galaxy group/cluster catalogs created from the Sloan Digital Sky Survey Data Release 7, we examine in detail the specific star formation rate (SSFR) distribution of satellite galaxies and its de...
Galaxy Zoo: Dust lane early-type galaxies are tracers of recent, gas-rich minor mergers
galaxies: evolution — galaxies: interactions — galaxies: active — galax-ies: elliptical and lenticular
2011/10/17
We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of AGN activity in th...
Galaxy Zoo: Dust and molecular gas in early-type galaxies with prominent dust lanes
galaxies: ISM - galaxies: elliptical and lenticular cD - galaxies: peculiar galaxies: interactions - galaxies: formation - galaxies: evolution
2011/10/17
We study dust and associated molecular gas in 352 nearby early-type galaxies (ETGs) with prominent dust lanes. 65% of these 'dusty ETGs' (D-ETGs) are morphologically disturbed, suggesting a merger ori...
Chemical properties in the most distant radio galaxy
galaxies: active – galaxies: nuclei – quasars: emission lines – quasars: general
2011/10/21
We present a deep optical spectrum of TN J0924-2201, the most distant radio galaxy at z = 5.19, obtained with FOCAS on the Subaru Telescope. We successfully detect, for the first time, the CIV1549 emi...
A New Collisional Ring Galaxy at z = 0.111: Auriga's Wheel
Collisional Ring Galaxy Auriga Wheel
2011/10/12
We report the serendipitous discovery of a collision ring galaxy, identified as 2MASX J06470249+4554022, which we have dubbed 'Auriga's Wheel', found in a SUPRIME-CAM frame as part of a larger Milky W...
Are Halo and Galaxy Formation Histories Correlated?
cosmology: observations—galaxies:clustering—galaxies: groups: general— galaxies: clusters: general — galaxies: evolution
2011/10/19
The properties of dark matter halos, including mass growth, correlate with larger scale environment at fixed mass, an effect known as assembly bias. However, whether this environmental dependence mani...
An HI column density threshold for cold gas formation in the Galaxy
column density threshold cold gas formation Galaxy
2011/9/28
We report the discovery of a threshold in the HI column density of Galactic gas clouds below which the formation of the cold phase of HI is inhibited. This threshold is at $N_{HI} = 2 \times 10^{20}$ ...
On the BH-galaxy relation of AGN and Narrow Line Seyfert 1 Galaxies
BH-galaxy relation AGN Narrow Seyfert Galaxies
2011/10/12
Massive black holes (BHs) are detected in the centers of many nearby galaxies are linearly correlated with the luminosity of the host bulge (spheroid), the black hole mass being about 0.1% of the stel...
A modified star formation law as a solution to open problems in galaxy evolution
galaxies: evolution – galaxies: formation – galaxies: stellar content –galaxies: haloes
2011/10/13
In order to reproduce the low mass end of the stellar mass function, most current models of galaxy evolution invoke very efficient supernova feedback. This solution seems to suffer from several shortc...