scholarly journals DISCOVERY OF MEGAPARSEC-SCALE, LOW SURFACE BRIGHTNESS NONTHERMAL EMISSION IN MERGING GALAXY CLUSTERS USING THE GREEN BANK TELESCOPE

2013 ◽  
Vol 779 (2) ◽  
pp. 189 ◽  
Author(s):  
Damon Farnsworth ◽  
Lawrence Rudnick ◽  
Shea Brown ◽  
Gianfranco Brunetti
Keyword(s):  
Galaxy Clusters ◽  
Surface Brightness ◽  
Low Surface Brightness ◽  
Nonthermal Emission ◽  
Green Bank Telescope

scholarly journals Low Surface Brightness Dwarf Galaxies in Nearby Clusters

1999 ◽  
Vol 171 ◽  
pp. 157-159
Author(s):  
Kristin Chiboucas ◽  
Mario Mateo
Keyword(s):  
Galaxy Clusters ◽  
Surface Brightness ◽  
Dwarf Galaxies ◽  
Cluster Galaxy ◽  
V Band ◽  
Luminosity Functions ◽  
Low Surface Brightness ◽  
Initial Results

AbstractWe present initial results of a study of low surface brightness dwarf galaxies within galaxy clusters at z ≤ .03 as part of our program to determine the clustering properties, luminosity functions, and morphologies of dwarf galaxies in a wider range of cluster environments. In addition to deep V-band images covering up to 1 deg2 in each of 13 different clusters, we have obtained velocities from fiber spectroscopy for 235 galaxies in A3526. In A3526, we find a drop in cluster galaxy counts at intermediate magnitudes which is supported by our spectroscopic results.

The Hi Neighborhoods Around STARBIRDS

2018 ◽  
Vol 14 (S344) ◽  
pp. 280-282
Author(s):  
Megan C. Johnson ◽  
Kristen B. W. McQuinn ◽  
John Cannon ◽  
Charlotte Martinkus ◽  
Evan Skillman ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Spiral Galaxies ◽  
Dwarf Galaxies ◽  
Neutral Hydrogen ◽  
Tidal Interactions ◽  
Low Surface Brightness ◽  
The Galaxy ◽  
Green Bank Telescope ◽  
Intense Star Formation

AbstractStarbursts are finite periods of intense star formation (SF) that can dramatically impact the evolutionary state of a galaxy. Recent results suggest that starbursts in dwarf galaxies last longer and are distributed over more of the galaxy than previously thought, with star formation efficiencies (SFEs) comparable to spiral galaxies, much higher than those typical of non-bursting dwarfs. This difference might be explainable if the starburst mode is externally triggered by gravitational interactions with other nearby systems. We present new, sensitive neutral hydrogen observations of 18 starburst dwarf galaxies, which are part of the STARburst IRregular Dwarf Survey (STARBIRDS) and each were mapped with the Green Bank Telescope (GBT) and/or Parkes Telescope in order to study the low surface brightness gas distributions, a common tracer for tidal interactions.

scholarly journals Detecting magnetic fields in large-scale structure with radio polarization

2008 ◽  
Vol 4 (S259) ◽  
pp. 669-670 ◽  
Author(s):  
Shea Brown ◽  
Lawrence Rudnick ◽  
Damon Farnsworth
Keyword(s):  
Magnetic Fields ◽  
Surface Brightness ◽  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Synchrotron Emission ◽  
Clusters Of Galaxies ◽  
Coma Cluster ◽  
Low Surface Brightness ◽  
Green Bank Telescope

AbstractWe present our attempts to detect magnetic fields in filamentary large-scale structure (LSS) by observing polarized synchrotron emission emitted by structure formation shocks. Little is known about the strength and order of magnetic fields beyond the largest clusters of galaxies, and synchrotron emission holds enormous promise as a means of probing magnetic fields in these low density regions. We report on observations taken at the Green Bank Telescope which reveal a possible Mpc extension to the Coma cluster relic. We also highlight the major obstacle that diffuse galactic foreground emission poses for any search for large-scale, low surface-brightness extragalactic emission. Finally we explore cross-correlation of diffuse radio emission with optical tracers of LSS as a means to statistically detecting magnetic fields in the presence of this confounding foreground emission.

scholarly journals The abundance of ultra-diffuse galaxies from groups to clusters

2017 ◽  
Vol 607 ◽  
pp. A79 ◽  
Author(s):  
Remco F. J. van der Burg ◽  
Henk Hoekstra ◽  
Adam Muzzin ◽  
Cristóbal Sifón ◽  
Massimo Viola ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
Surface Brightness ◽  
Galaxy Groups ◽  
Destruction Rate ◽  
Low Surface Brightness ◽  
The Galaxy ◽  
Mass Assembly ◽  
Massive Clusters ◽  
Positive Effect

In recent years, many studies have reported substantial populations of large galaxies with low surface brightness in local galaxy clusters. Various theories that aim to explain the presence of such ultra-diffuse galaxies (UDGs) have since been proposed. A key question that will help to distinguish between models is whether UDGs have counterparts in host haloes with lower masses, and if so, what their abundance as a function of halo mass is. We here extend our previous study of UDGs in galaxy clusters to galaxy groups. We measure the abundance of UDGs in 325 spectroscopically selected groups from the Galaxy And Mass Assembly (GAMA) survey. We make use of the overlapping imaging from the ESO Kilo-Degree Survey (KiDS), from which we can identify galaxies with mean surface brightnesses within their effective radii down to ~25.5 mag arcsec-2 in the r band. We are able to measure a significant overdensity of UDGs (with sizes reff ≥ 1.5 kpc) in galaxy groups down to M200 = 1012 M⊙, a regime where approximately only one in ten groups contains a UDG that we can detect. We combine measurements of the abundance of UDGs in haloes that cover three orders of magnitude in halo mass, finding that their numbers scale quite steeply with halo mass: NUDG(R < R200) ∝ M2001.11±0.07. To better interpret this, we also measure the mass-richness relation for brighter galaxies down to Mr* + 2.5 in the same GAMA groups, and find a much shallower relation of NBright(R < R200) ∝ M2000.78±0.05. This shows that compared to bright galaxies, UDGs are relatively more abundant in massive clusters than in groups. We discuss the implications, but it is still unclear whether this difference is related to a higher destruction rate of UDGs in groups or if massive haloes have a positive effect on UDG formation.

A Survey for Low Surface Brightness Galaxies around M31. II. The Newly Discovered Dwarf Andromeda VI

1999 ◽  
Vol 118 (3) ◽  
pp. 1220-1229 ◽  
Author(s):  
Taft E. Armandroff ◽  
George H. Jacoby ◽  
James E. Davies
Keyword(s):  
Surface Brightness ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

Kinematics and Neutral Hydrogen Properties of the Giant Low Surface Brightness Galaxy UGC 2936

1999 ◽  
Vol 118 (2) ◽  
pp. 765-776 ◽  
Author(s):  
T. E. Pickering ◽  
J. H. van Gorkom ◽  
C. D. Impey ◽  
A. C. Quillen
Keyword(s):  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Low Surface Brightness

Discovery of a Low Surface Brightness Object near Seyfert’s Sextet

2000 ◽  
Vol 119 (4) ◽  
pp. 1691-1694 ◽  
Author(s):  
Takashi Murayama ◽  
Shingo Nishiura ◽  
Tohru Nagao ◽  
Yasunori Sato ◽  
Yoshiaki Taniguchi ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Low Surface Brightness
Sign in / Sign up

Export Citation Format

Share Document