scholarly journals Properties of galaxies in the disc central surface brightness gap

2015 ◽  
Vol 455 (3) ◽  
pp. 2644-2655 ◽  
Author(s):  
Jenny G. Sorce ◽  
Peter Creasey ◽  
Noam I. Libeskind
Keyword(s):  
Surface Brightness ◽  
Central Surface

scholarly journals Dwarf Galaxies in Nearby Groups

1999 ◽  
Vol 171 ◽  
pp. 154-156
Author(s):  
T. Bremnes ◽  
B. Binggeli ◽  
P. Prugniel
Keyword(s):  
Surface Brightness ◽  
Dwarf Galaxies ◽  
Photometric Data ◽  
Preliminary Results ◽  
Central Surface ◽  
Total Magnitude ◽  
Evolutionary Connection

AbstractWe present preliminary results from two observing campaigns where global photometric data for most dwarf galaxies in the M81 and M101 groups as well as some field dwarfs were obtained. The galaxies in the denser M81 group are more often of dwarf elliptical type and are redder and fainter than those of the M101 group and surrounding field, which are mostly of the dwarf irregular types. But both types follow the same total magnitude - central surface brightness relation, so there might be an evolutionary connection between the two classes.

scholarly journals The Structure of Collapsed Cluster Cores

1988 ◽  
Vol 126 ◽  
pp. 657-658
Author(s):  
Phyllis M. Lugger ◽  
Haldan Cohn ◽  
Jonathan E. Grindlay ◽  
Charles D. Bailyn ◽  
Paul Hertz
Keyword(s):  
Power Law ◽  
Globular Clusters ◽  
Surface Brightness ◽  
Core Collapse ◽  
Central Surface ◽  
Core Profile ◽  
Galactic Globular Clusters ◽  
Cluster Cores

In order to test the prediction that many Galactic globular clusters have undergone core collapse (Lightman 1982, Cohn and Hut 1984) and should therefore have central surface brightness cusps, we have obtained UBVR CCD frames of the cores of 72 clusters. We present and analyze U-band surface brightness profiles for three clusters: one “control cluster” with a normal flat core profile — NGC 6388 — and two with central power law cusps — NGC 6624 and M15 (NGC 7078).

scholarly journals The effects of dust on the derived photometric parameters of disks and bulges in spiral galaxies

2012 ◽  
Vol 8 (S292) ◽  
pp. 290-290
Author(s):  
B. A. Pastrav ◽  
C. C. Popescu ◽  
R. J. Tuffs ◽  
A. E. Sansom
Keyword(s):  
Surface Brightness ◽  
Spiral Galaxies ◽  
Intrinsic Value ◽  
Central Surface ◽  
Intrinsic Values ◽  
Balmer Lines ◽  
The One ◽  
The Individual ◽  
Dust Effects ◽  
Simulated Images

AbstractHere we present results on the effects of dust on the derived Sérsic index of disks and bulges. This is part of a larger study (see Pastrav et al. 2012a, Pastrav et al. 2012b) that quantifies the dust effects on all photometric parameters, including scale-lengths, axis-ratios, central surface brightness and effective radii of individual and decomposed (from B/D decomposition) disks and bulges. The effects of dust are derived for both broadband and narrow line (Balmer lines) images. The changes in the derived photometric parameters from their intrinsic values (as seen in the absence of dust) were obtained by fitting simulated images of disks and bulges produced using radiative transfer calculations and the model of Popescu et al. (2011). This study follows on the analysis of Möllenhoff et al. (2006), who quantified the effects of dust on the photometry of old stellar disks seen at low and intermediate inclination. We extend the study to disks at all inclinations and we investigate the changes in the photometry of young stellar disks and bulges. For the individual components, in the majority of cases: 1) the dust lowers the Sérsic index from its intrinsic value; 2) the Sérsic index decreases as the inclination and the B band central face-on dust opacity, τBf, increase. For the decomposed disks and bulges, dust slightly increases the Sérsic index as compared with the one derived on individual components (e.g. Fig. 1); this effect is stronger for higher values of the inclination, τBf and B/D.

scholarly journals The Connection Between dE and dI Galaxies

1999 ◽  
Vol 171 ◽  
pp. 271-273
Author(s):  
Bryan W. Miller
Keyword(s):  
Globular Cluster ◽  
Surface Brightness ◽  
Central Surface ◽  
Light Profiles

AbstractWe combine specific globular cluster frequencies (SN) with newly measured surface brightness profiles to identify dEs that may be stripped dIs. Luminous dEs generally have higher surface brightnesses and steep central light profiles. Conversely, fainter dEs have low surface brightnesses and flatter central light profiles. The most likely candidates for stripped dIs have low SN and low central surface brightnesses.

The extrapolated central surface brightness of galaxies

1979 ◽  
Vol 227 ◽  
pp. 67 ◽  
Author(s):  
R. J. Allen ◽  
F. H. Shu
Keyword(s):  
Surface Brightness ◽  
Central Surface

scholarly journals The Centers of Early‐Type Galaxies withHubble Space Telescope. VI. Bimodal Central Surface Brightness Profiles

2007 ◽  
Vol 664 (1) ◽  
pp. 226-256 ◽  
Author(s):  
Tod R. Lauer ◽  
Karl Gebhardt ◽  
S. M. Faber ◽  
Douglas Richstone ◽  
Scott Tremaine ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Early Type ◽  
Space Telescope ◽  
Central Surface

scholarly journals A Concise Reference to (Projected) Sérsic R1/n Quantities, Including Concentration, Profile Slopes, Petrosian Indices, and Kron Magnitudes

2005 ◽  
Vol 22 (2) ◽  
pp. 118-127 ◽  
Author(s):  
Alister W. Graham ◽  
Simon P. Driver
Keyword(s):  
Power Law ◽  
Concentration Profile ◽  
Surface Brightness ◽  
Intensity Profile ◽  
Total Flux ◽  
Effective Surface ◽  
The Core ◽  
Central Surface ◽  
Mathematical Expressions ◽  
The Mean

AbstractGiven the growing use of Sérsic's (1963, 1968) R1/n model for describing the stellar distributions in galaxies, and the lack of any single reference that provides the various associated mathematical expressions, we have endeavoured to compile such a resource here. We present the standard intensity profile, and its various guises such as the luminosity, surface-brightness, and aperture–magnitude profile. Expressions to transform the effective surface brightness into the mean effective and central surface brightness are also given, as is the expression to transform between effective radii and exponential scale-lengths. We additionally provide expressions for deriving the ‘concentration’ of an R1/n profile, and two useful equations for the logarithmic slope of the light-profile are given. Petrosian radii and fluxes are also derived for a range of Sérsic profiles and compared with the effective radii and total flux. Similarly, expressions to obtain Kron radii and fluxes are presented as a function of the Sérsic index n and the number of effective radii sampled. Illustrative figures are provided throughout. Finally, the core–Sérsic model, consisting of an inner power-law and an outer Sérsic function, is presented.

scholarly journals The Dwarf Low Surface Brightness Population in Different Environments of the Local Universe

2007 ◽  
Vol 3 (S244) ◽  
pp. 311-320 ◽  
Author(s):  
S. Sabatini ◽  
J. I. Davies ◽  
S. Roberts ◽  
R. Scaramella
Keyword(s):  
Surface Brightness ◽  
Dwarf Galaxy ◽  
Virgo Cluster ◽  
Data Sampling ◽  
Large Area ◽  
Central Surface ◽  
Major Cluster ◽  
Low Surface Brightness ◽  
Cluster A ◽  
East West

AbstractThe nature of the dwarf galaxy population as a function of location in the cluster and within different environments is investigated. We have previously described the results of a search for low surface brightness objects in data drawn from an East-West strip of the Virgo cluster (Sabatini et al(2004)) and have compared this to a large area strip outside of the cluster (Roberts et al (2004)). In this talk I compare the East-West data (sampling sub-cluster A and outward) to new data along a North-South cluster strip that samples a different region (part of sub-cluster A, and the N, M clouds) and with data obtained for the Ursa Major cluster and fields around the spiral galaxy M101. The sample of dwarf galaxies in different environments is obtained from uniform datasets that reach central surface brightness values of 26 B mag/arcsec2 and an apparent B magnitude of 21 (MB =−10 for a Virgo Cluster distance of 16 Mpc). We discuss and interpret our results on the properties and distribution of dwarf low surface brightness galaxies in the context of variuos physical processes that are thought to act on galaxies as they form and evolve.

scholarly journals The Surface Brightness of Our Galaxy and Other Spirals

1990 ◽  
Vol 139 ◽  
pp. 85-97
Author(s):  
P. C. van der Kruit
Keyword(s):  
Distribution Function ◽  
Surface Brightness ◽  
Large Scale ◽  
Spiral Galaxies ◽  
Hubble Constant ◽  
Central Surface ◽  
The Galaxy ◽  
Scale Length

In this review I discuss some aspects of the luminosity distributions in our Galaxy and external spiral galaxies. The major conclusions are the following: (1) the radial scale length of the luminosity distribution in the disk of our Galaxy is 5.0 ± 0.5 kpc, (2) on this basis the Hubble constant needs to be at most 65 ± 10 km s−1 Mpc−1, if our Galaxy and M31 are among the largest spirals, as the Fisher-Tully relation suggests, (3) the probable Hubble type of the Galaxy is SbI–II, (4) the bi-modal distribution function of face-on, central surface brightness μ0 and radial scale length h of spirals shows a preferred value for μ0 of about 22 B-mag arcsec2 and a distribution of h that declines with one e-folding per kpc, (5) the Galaxy is a normal, fairly large Sb galaxy, and (6) galaxies similar to our own in terms of large-scale, nonmorphological properties are NGC 891 and NGC 5033.

Sign in / Sign up

Export Citation Format

Share Document