Modeling the Interstellar Medium of Low Surface Brightness Galaxies: Constraining Internal Extinction, Disk Color Gradients, and Intrinsic Rotation Curve Shapes

Matthews, L. D.; Wood, Kenneth

doi:10.1086/318687

Cited by 81 publications

(97 citation statements)

References 89 publications

(126 reference statements)

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“…In particular, galaxies with scale lengths higher than about 1 kpc seem to enter the area of negative colour gradients. This is consistent with the observation that larger galaxies (LSB and normal spirals) have older central populations forcing negative colour gradients, with values correlated to bulge sizes (Bell & de Jong 2000;Matthews & Wood 2001;Andredakis et al 1995). A handful of our dwarf irregular galaxies exhibit strong negative colour gradients, however.…”

Section: Change Of Colour Gradientssupporting

confidence: 90%

Structure and stellar content of dwarf galaxies

Parodi

Barazza

Binggeli

2002

A&A

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Abstract. We present B and R band surface photometry of 25 Southern field dwarf galaxies within a distance of 10 Mpc. For each galaxy we give the essential model-free photometric parameters and, by fitting exponentials to the surface brightness profiles, the central extrapolated surface brightness and the exponential scale length, in both colour bands. Surface brightness and colour profiles are shown. One of the objects, a very faint dwarf elliptical in the vicinity of NGC 2784, has been discovered in the course of this work. Drawing on the data from this and all previous papers of this series, we construct a complete sample of 72 late-type ("irregular") dwarf galaxies in nearby groups and the field within the 10 Mpc volume, to study the exponentialdisk parameter relations of these galaxies with respect to galaxy environment. We confirm our previous finding of statistically lower scale lengths/higher central surface brightnesses for field and group galaxies as compared to cluster galaxies. However, using a clear-cut definition of "group" versus "field" environment, we find no significant difference in the photometric structure of group and field irregulars. A difference in the star formation history may partly account for this structure-environment relation: for a given luminosity cluster dwarfs are on average redder than field and group galaxies. We also report evidence for the colour gradients of dwarf irregulars being roughly inversely proportional to the disk scale lengths. Supplementing our photometric data with kinematic data from the literature, we study possible relations with kinematic properties of the inner disk. Applying the dark matter scaling relations for a Burkert halo we show that for field and group galaxies of a given luminosity faster-than-mean disk rotational velocities at a radius of about two scale lengths are correlated with larger-than-mean disk scale lengths.

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Section: Change Of Colour Gradientssupporting

confidence: 90%

Structure and stellar content of dwarf galaxies

Parodi

Barazza

Binggeli

2002

A&A

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“…This galaxy has a very low deprojected central surface brightness [l V ð0Þ % 25:5 mag arcsec À2 ] and would likely be nearly invisible if seen close to face-on in an optical broadband survey image. As demonstrated by Matthews & Wood (2001), such a shallow rotation curve cannot be explained solely by projection effects or internal extinction, even in edge-on systems.…”

Section: The Shapes Of Extreme Late-type Spiral Rotation Profilesmentioning

confidence: 94%

High‐Resolution Optical Rotation Curves of Low‐Luminosity Spiral Galaxies

Matthews¹,

Gallagher²

2002

ASTROPHYS J SUPPL S

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We present optical long-slit spectroscopic observations of 21 low-luminosity, extreme late-type spiral galaxies. Our sample is comprised of Sc-Sm Local Supercluster spirals with moderate-to-low optical surface brightnesses and with luminosities at the low end for spiral disk galaxies (M V ! À18:8). For each galaxy we have measured high spatial resolution position-velocity (P-V) curves using the H emission line, and for 15 of the galaxies we also derive major-axis rotation curves. In $50% of our sample, the P-V curves show significant asymmetries in shape, extent, and/or amplitude on the approaching and receding sides of the disk. A number of the P-V curves are still rising to the last measured point or reach a clear turnover on only one side. In most instances we find good agreement between the kinematic centers of extreme late-type spirals as defined by the global H i emission profile and by their optical continuum, although in a few cases we see evidence of possible real offsets. In spite of their shallow central gravitational potentials, at least six of the galaxies in our sample possess semi-stellar nuclei that appear to be compact nuclear star clusters; in five of these cases we see kinematic signatures in the P-V curves at the location of the nucleus. Finally, we find that like giant spirals, our sample galaxies have higher specific angular momenta than predicted by current cold dark matter models.

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“…In addition, Matthews et al (1999) and Matthews & van Driel (2000) show the "lack of a quintessential dust lane" in the prototypical superthin galaxy UGC 7321. In another paper, Matthews & Wood (2001) conclude that the dusty interstellar medium (ISM) in this type of objects has a clumpy and patchy distribution. They derived the observed properties of dust with the aid of a multiphase ISM model and found that "≈50% of the dusty material in UGC 7321 is contained in a clumpy medium".…”

Section: The Influence Of Dust and Distancementioning

confidence: 98%

A catalog of edge-on disk galaxies

Kautsch¹,

Grebel²,

Barazza

et al. 2005

A&A

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Spiral galaxies range from bulge-dominated early-type galaxies to late types with little or no bulge. Cosmological models do not predict the formation of disk-dominated, essentially bulgeless galaxies, yet these objects exist. A particularly striking and poorly understood example of bulgeless galaxies are flat or superthin galaxies with large axis ratios. We therefore embarked on a study aimed at a better understanding of these enigmatic objects, starting by compiling a statistically meaningful sample with well-defined properties. The disk axis ratios can be most easily measured when galaxies are seen edge-on. We used data from the Sloan Digital Sky Survey (SDSS) in order to identify edge-on galaxies with disks in a uniform, reproducible, automated fashion. In the five-color photometric database of the SDSS Data Release 1 (2099 deg 2 ) we identified 3169 edge-on disk galaxies, which we subdivided into disk galaxies with bulge, intermediate types, and simple disk galaxies without any obvious bulge component. We subdivided these types further into subclasses: Sa(f), Sb(f), Sc(f), Scd(f), Sd(f), Irr(f), where the (f) indicates that these galaxies are seen edge-on. Here we present our selection algorithm and the resulting catalogs of the 3169 edge-on disk galaxies including the photometric, morphological, and structural parameters of our targets. A number of incompleteness effects affect our catalog, but it contains almost a factor of four more bulgeless galaxies with prominent simple disks (flat galaxies) within the area covered here than previous optical catalogs, which were based on the visual selection from photographic plates (cf. Karachentsev et al. 1999, Bull. Special Astrophys. Obs., 47, 5). We find that approximately 15% of the edge-on disk galaxies in our catalog are flat galaxies, demonstrating that these galaxies are fairly common, especially among intermediate-mass star-forming galaxies. Bulgeless disks account for roughly one third of our galaxies when also puffy disks and edge-on irregulars are included. Our catalog provides a uniform database for a multitude of follow-up studies of bulgeless galaxies in order to constrain their intrinsic and environmental properties and their evolutionary status.

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Modeling the Interstellar Medium of Low Surface Brightness Galaxies: Constraining Internal Extinction, Disk Color Gradients, and Intrinsic Rotation Curve Shapes

Cited by 81 publications

References 89 publications

Structure and stellar content of dwarf galaxies

Structure and stellar content of dwarf galaxies

High‐Resolution Optical Rotation Curves of Low‐Luminosity Spiral Galaxies

A catalog of edge-on disk galaxies

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