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

Rotating Halos and Heavy Disks: the Case of NGC 2915

2004 ◽  
Vol 217 ◽  
pp. 172-173
Author(s):  
Frédéric S. Masset ◽  
Martin Bureau
Keyword(s):  
Surface Brightness ◽  
Spiral Structure ◽  
Dwarf Galaxy ◽  
Neutral Hydrogen ◽  
Dark Halo ◽  
Pattern Frequency ◽  
Spin Parameter ◽  
Low Surface Brightness ◽  
Hydrodynamical Simulations ◽  
Blue Compact Dwarf Galaxy

NGC 2915 is a blue compact dwarf galaxy embedded in an extended, low surface brightness HI disk with a bar and two-armed spiral structure. Common mechanisms are unable to explain those patterns and disk dark matter or a rotating triaxial dark halo were proposed as alternatives. Hydrodynamical simulations were run for each case and compared to observations using customized column density and kinematic constraints. The spiral structure can be accounted for by an unseen bar or triaxial halo, but the large bar mass or halo pattern frequency required make it unlikely that the spiral is driven by an external perturber. In particular, the spin parameter lambda is much higher than predicted by current CDM structure formation scenarios. Massive disk models show that when the gas surface density is scaled up by a factor of about 10, the disk develops a spiral structure matching the observed one in perturbed density as well as velocity. This suggests that the disk of NGC 2915 contains much more mass than is visible tightly linked to the neutral hydrogen. A classic (quasi-)spherical halo is nevertheless still required, as increasing the disk mass further to fit the circular velocity curve would make the disk violently unstable

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 The Low Surface Brightness Galaxy HIPASS1126-72

1999 ◽  
Vol 171 ◽  
pp. 204-206
Author(s):  
Virginia Kilborn ◽  
Erwin de Blok ◽  
Lister Staveley-Smith ◽  
Rachel Webster
Keyword(s):  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Sky Survey ◽  
Low Surface Brightness ◽  
The Galaxy

AbstractThe low surface brightness galaxy HIPASS1126-72 was detected in the HI Parkes All Sky Survey (HIPASS). The galaxy was previously listed in the Southern Galaxy Catalogue under the name SGC1124.87221. This galaxy represents a class of galaxies that we will readily detect in the HIPASS survey, which have low surface brightness in the optical, but are easily detectable in neutral hydrogen.

Northern dwarf and low surface brightness galaxies. I - The Arecibo neutral hydrogen survey

1990 ◽  
Vol 72 ◽  
pp. 245 ◽  
Author(s):  
Stephen E. Schneider ◽  
Trinh X. Thuan ◽  
Christopher Magri ◽  
James E. Wadiak
Keyword(s):  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

scholarly journals Neutral Hydrogen Observations of Low Surface Brightness Galaxies around M101 and NGC 5485

2020 ◽  
Vol 159 (2) ◽  
pp. 37 ◽  
Author(s):  
A. Karunakaran ◽  
K. Spekkens ◽  
P. Bennet ◽  
D. J. Sand ◽  
D. Crnojević ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

scholarly journals Multiwavelength analysis of low surface brightness galaxies to study possible dark matter signature

2020 ◽  
Author(s):  
Pooja Bhattacharjee ◽  
Pratik Majumdar ◽  
Mousumi Das ◽  
Subinoy Das ◽  
Partha S Joarder ◽  
...  
Keyword(s):  
Dark Matter ◽  
Surface Brightness ◽  
Neutral Hydrogen ◽  
Indirect Detection ◽  
Large Area ◽  
Very Large Array ◽  
Dwarf Spheroidal Galaxies ◽  
Optical Images ◽  
Low Surface Brightness ◽  
Lsb Galaxies

Abstract Low Surface Brightness (LSB) galaxies have very diffuse, low surface density stellar disks which appear faint in optical images. They are very rich in neutral hydrogen (HI) gas, which extends well beyond the stellar disks. Their extended HI rotation curves and stellar disks indicate that they have very massive dark matter (DM) halos compared to normal bright galaxies. Hence, LSB galaxies may represent valuable laboratories for the indirect detection of DM. In this paper, we search for WIMP annihilation signatures in four LSB galaxies and present an analysis of nearly nine years of data from the Fermi Large Area Telescope (LAT). Above 500 MeV, no excess emission was detected from the LSB galaxies. We obtain constraints on the DM cross-section for different annihilation channels, for both individual and stacked targets. In addition to this, we use radio data from the Very Large Array (VLA) radio telescope in order to derive DM constraints, following a multiwavelength approach. The constraints obtained from the four considered LSB galaxies are nearly 3 orders of magnitude weaker than the predicted limits for the thermal relic abundances and the combined limits achieved from Fermi-LAT observations of dwarf spheroidal galaxies. Finally, we discuss the possibility of detecting emission from LSB galaxies using the upcoming ground-based γ-ray and radio observatories, namely the Cherenkov Telescope Array (CTA) and the Square Kilometre Array (SKA).

scholarly journals Rotating Halos and Heavy Disks: The Case of NGC 2915

2004 ◽  
Vol 220 ◽  
pp. 293-298
Author(s):  
Frédéric S. Masset ◽  
Martin Bureau
Keyword(s):  
Surface Brightness ◽  
Spiral Structure ◽  
Dwarf Galaxy ◽  
Neutral Hydrogen ◽  
Dark Halo ◽  
Pattern Frequency ◽  
Spin Parameter ◽  
Low Surface Brightness ◽  
Hydrodynamical Simulations ◽  
Blue Compact Dwarf Galaxy

NGC 2915 is a blue compact dwarf galaxy embedded in an extended, low surface brightness HI disk with a bar and two-armed spiral structure. Common mechanisms are unable to explain those patterns and disk dark matter or a rotating triaxial dark halo were proposed as alternatives. Hydrodynamical simulations were run for each case and compared to observations using customized column density and kinematic constraints. the spiral structure can be accounted for by an unseen bar or triaxial halo, but the large bar mass or halo pattern frequency required make it unlikely that the spiral is driven by an external perturber. in particular, the spin parameter lambda is much higher than predicted by current CDM structure formation scenarios. Massive disk models show that when the gas surface density is scaled up by a factor of about 10, the disk develops a spiral structure matching the observed one in perturbed density as well as velocity. This suggests that the disk of NGC 2915 contains much more mass than is visible, tightly linked to the neutral hydrogen. A classic (quasi-)spherical halo is nevertheless still required, as increasing the disk mass further to fit the circular velocity curve would make the disk violently unstable

Low surface brightness spiral galaxies. I - Neutral hydrogen content and location in the infrared Fisher-Tully diagram

1982 ◽  
Vol 263 ◽  
pp. 94 ◽  
Author(s):  
W. Romanishin ◽  
N. Krumm ◽  
E. Salpeter ◽  
G. Knapp ◽  
K. M. Strom ◽  
...  
Keyword(s):  
Hydrogen Content ◽  
Surface Brightness ◽  
Spiral Galaxies ◽  
Neutral Hydrogen ◽  
Low Surface Brightness

scholarly journals An HI Survey of LSB galaxies selected from the APM Survey

1999 ◽  
Vol 171 ◽  
pp. 307-314 ◽  
Author(s):  
Stéphanie Côté ◽  
Tom Broadhurst ◽  
Jon Loveday ◽  
Shannon Kolind
Keyword(s):  
Total Mass ◽  
Surface Brightness ◽  
Luminosity Function ◽  
Neutral Hydrogen ◽  
Mass Function ◽  
Low Surface Brightness ◽  
Redshift Survey ◽  
First Time ◽  
Lsb Galaxies ◽  
Negligible Contribution

AbstractWe present preliminary results of a neutral hydrogen (HI) redshift survey to find Low Surface Brightness (LSB) galaxies in the very nearby universe. Our sample consists of all galaxies in the APM catalog (Maddox et al. 1990) with a mean surface brightness of μ ≥ 24 mag/arcsec2, down to a magnitude limit of bj ≤ 17. With the Parkes 64m radiotelescope 35 objects were detected at v < 4300 km s−1. The resulting luminosity function, HI mass function, and for the first time total mass function are presented. It is found that LSBs make a negligible contribution to the overall integrated luminosity, HI mass, and total mass contained in galaxies.

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