scholarly journals Detections of CO in Late-Type, Low Surface Brightness Spiral Galaxies

2005 ◽  
Vol 129 (4) ◽  
pp. 1849-1862 ◽  
Author(s):  
Lynn D. Matthews ◽  
Yu Gao ◽  
Juan M. Uson ◽  
Françoise Combes
Keyword(s):  
Surface Brightness ◽  
Spiral Galaxies ◽  
Late Type ◽  
Low Surface Brightness

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.

The mass-to-light ratios of low surface brightness spiral galaxies: Clues from the Tully-Fisher relation

1995 ◽  
Vol 438 ◽  
pp. 72 ◽  
Author(s):  
D. Sprayberry ◽  
G. M. Bernstein ◽  
C. D. Impey ◽  
G. D. Bothun
Keyword(s):  
Surface Brightness ◽  
Spiral Galaxies ◽  
Low Surface Brightness ◽  
Fisher Relation

scholarly journals An optical and H I study of late-type low surface brightness galaxies

1982 ◽  
Vol 200 (2) ◽  
pp. 325-346 ◽  
Author(s):  
A. J. Longmore ◽  
T. G. Hawarden ◽  
W. M. Goss ◽  
U. Mebold ◽  
B. L. Webster
Keyword(s):  
Surface Brightness ◽  
Late Type ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

scholarly journals The σc — Vcirc correlation in high and low surface brightness galaxies

2004 ◽  
Vol 220 ◽  
pp. 339-340 ◽  
Author(s):  
A. Pizzella ◽  
E. Dalla Bontà ◽  
E. M. Corsini ◽  
L. Coccato ◽  
F. Bertola
Keyword(s):  
Surface Brightness ◽  
Velocity Dispersion ◽  
Spiral Galaxies ◽  
High Surface ◽  
Linear Scale ◽  
High Surface Brightness ◽  
Circular Velocity ◽  
Straight Line ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

We investigate the relation between the central velocity dispersion, σc, and the circular velocity, Vcirc, in galaxies. in addition to previously obtained data, we consider an observationally homogeneus sample of 52 high surface brightness and 11 low surface brightness spiral galaxies. We performed a straight line regression analysis in a linear scale, finding a good fit, also for low σc galaxies, always rejected in the previous studies. Low surface brightness galaxies seem to behave differently, showing either higher values of Vcirc or lower values of σc with respect to their high surface brightness counterparts.

scholarly journals The Space Density of Spiral Galaxies as function of their Luminosity, Surface Brightness and Scalesize

1999 ◽  
Vol 171 ◽  
pp. 52-59 ◽  
Author(s):  
Roelof S. de Jong ◽  
Cedric Lacey
Keyword(s):  
Surface Brightness ◽  
Luminosity Function ◽  
Spiral Galaxies ◽  
Structural Parameters ◽  
Space Density ◽  
Cosmological Redshift ◽  
Density Distributions ◽  
Low Surface Brightness ◽  
Local Space ◽  
Log Normal

AbstractThe local space density of galaxies as a function of their basic structural parameters -like luminosity, surface brightness and scalesize-is still poorly known. Our poor knowledge is mainly the result of strong selection biases against low surface brightness and small scalesize galaxies in any optically selected sample. We show that in order to correct for selection biases one has to obtain accurate surface photometry and distance estimates for a large (≳ 1000) sample of galaxies. We derive bivariate space density distributions in the (scalesize, surface brightness)-plane and the (luminosity, scalesize)-plane for a sample of ~1000 local Sb-Sdm spiral galaxies. We present a parameterization of these bivariate distributions, based on a Schechter type luminosity function and a log-normal scalesize distribution at a given luminosity. We show how surface brightness limits and (1+z)4 cosmological redshift dimming can influence interpretation of luminosity function determinations and deep galaxy counts.

scholarly journals Optical Counterparts to Galaxies in the Cen A Group Discovered by HIPASS

1999 ◽  
Vol 16 (1) ◽  
pp. 60-65 ◽  
Author(s):  
Patricia M. Knezek
Keyword(s):  
Surface Brightness ◽  
Survey Area ◽  
Late Type ◽  
New Members ◽  
Low Surface Brightness ◽  
Survey Technique ◽  
Group Members ◽  
The Subject ◽  
Centaurus A

AbstractWe have completed a 21-cm survey of a 600 square degree region of the Centaurus A group of galaxies at a redshift of ∼500 km s−1 as part of a larger survey of the entire southern sky. This group of galaxies was recently the subject of a separate and thorough optical survey (Côté et al. 1997), and thus presented an ideal comparison for us to test the survey performance. We have identified 10 new group members to add to the 21 already known in our survey area. Six of the new members are previously uncatalogued galaxies, while four were catalogued but assumed not to be group members. Including the seven known members outside of our survey area, this brings the total known number of Cen A members to 38. All of the new HI detections have optical counterparts, most being intrinsically very faint (MB > –13·0), late-type low surface brightness dwarfs. Most of the new members have HI masses only a few times our survey limit of 107M☉ at an assumed distance for the group of 3·5 Mpc, and are extremely gas-rich, with a median MHI/LB > 1. Our limiting HI sensitivity was actually slightly worse than the HI follow-up observations of the Côté et al. optical survey, yet we have already increased the known number of group members by 50% using an HIsurvey technique. While we have increased the known number of members by ∼50%, these new members contribute <4% to its light.

scholarly journals The Abell 35-Type Planetary Nuclei

1993 ◽  
Vol 155 ◽  
pp. 397-397 ◽  
Author(s):  
Howard E. Bond ◽  
Robin Ciardullo ◽  
Michael G. Meakes
Keyword(s):  
Surface Brightness ◽  
Late Type ◽  
Low Surface Brightness ◽  
Low Amplitude

The nuclei of the low-surface-brightness PNe A 35, LoTr 1, and LoTr 5 are binaries containing rapidly rotating late-type subgiants or giants and extremely hot (Teff ≳ 100,000 K) companions detected by the IUE satellite. All three objects show low-amplitude, periodic photometric variations in the optical band (with periods of 0.76 or 3.3, 6.6, and 5.9 days, respectively).

scholarly journals Morphology and Stellar Populations in the Gas-Rich, Giant LSBGs

1999 ◽  
Vol 171 ◽  
pp. 191-195 ◽  
Author(s):  
P. Knezek
Keyword(s):  
Entire Range ◽  
Surface Brightness ◽  
Spiral Galaxies ◽  
High Surface ◽  
Nuclear Spectroscopy ◽  
Nuclear Activity ◽  
High Surface Brightness ◽  
Low Surface Brightness ◽  
Show Evidence ◽  
Low Surface Brightness Galaxies

AbstractAn unexpected characteristic of low surface brightness galaxies (LSBGs) is that a significant number are massive and possess substantial amounts of atomic gas. We present preliminary results of an ongoing program to obtain BVRIJHK imaging, along with some nuclear spectroscopy, of a well-defined sample of LSBGs which are gas-rich and of similar size to giant, high surface brightness spiral galaxies (HSBGs). These LSBGs span the entire range of Hubble disk morphologies. While their disks are bluer, on average, than comparable HSBGs, the optical morphology of massive LSBGs indicates that many of these systems have undergone previous star formation episodes. They typically have long disk scale lengths, and range from MB = −16 to −22 (H0 = 75 km s−1 Mpc−1). About half of the LSBGs with bulges show evidence of nuclear activity, and ~30% appear to be barred. These massive, gas-rich LSBGs apparently have varied, and often complex, evolutionary histories.

scholarly journals The dust distribution in late-type low surface brightness disks

2011 ◽  
Vol 7 (S284) ◽  
pp. 101-103
Author(s):  
John MacLachlan ◽  
Lynn Matthews ◽  
Kenny Wood ◽  
Jay Gallagher
Keyword(s):  
Surface Brightness ◽  
High Surface ◽  
Stellar Disk ◽  
Disk Galaxies ◽  
Late Type ◽  
Vertical Scale ◽  
Low Surface Brightness ◽  
Multi Wavelength ◽  
Low Mass ◽  
Dust Distribution

AbstractLate-type low surface brightness (LSB) disk galaxies are common in the local universe and appear dynamically and chemically under evolved compared to their high surface brightness (HSB) counterparts. We have utilized multi-wavelength imaging and photometry of three edge-on, low-mass LSB disk galaxies to investigate the dust distribution in such systems. Through the use of Monte Carlo radiation transfer models to interpret the data, we find that the dust disk appears to have a vertical scale height similar to the stellar disk. This is in contrast to previous findings from HSB galaxies, where the dust is believed to be more concentrated in the galactic mid-plane. We believe the change in the relative scale heights of the dust and stellar disks is likely associated with the increased stability of the ISM against vertical collapse and the thin nature of the stellar disks.

Sign in / Sign up

Export Citation Format

Share Document