The Intrinsic Shapes of Low Surface Brightness Dwarf Irregular Galaxies and Comparison to Other Types of Dwarf Galaxies

Sung, Eon‐Chang; Han, Cheongho; Барбара,; Ryden, Barbara S.; Richard, Richard; Patterson, Richard J.; Chun, Moon-Suk; Kim, Ho-Il; Lee, Woo-Baik; Dong-Jin,

doi:10.1086/306166

Cited by 46 publications

(32 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The predicted rotation curve for an exponential mass distribution corresponding to the observed exponential surface brightness profile has been analytically given for a thin, self-gravitating exponential disk (Freeman 1970). Providing a characteristic inner disk radius this description may serve here as a simple model for the luminous matter distribution and the related Keplerian kinematics despite dwarf irregular and low-surface brightness galaxies being known to be better characterized by expanded disks (Sung et al 1998). The velocity profile exhibits a peak at radius R peak = 2.14 α −1 where it has a value of v d = 0.62(2πGΥ I 0 α −1 ) 0.5 ; here G is the gravitational constant, Υ the disk mass-to-light ratio, I 0 the face-on central mass surface density, and α −1 the scale length (e.g., Chiba & Yoshi 1995).…”

Section: Linkage Of Photometric and Kinematic Parametersmentioning

confidence: 99%

Structure and stellar content of dwarf galaxies

Parodi

Barazza

Binggeli

2002

A&A

View full text Add to dashboard Cite

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.

show abstract

Section: Linkage Of Photometric and Kinematic Parametersmentioning

confidence: 99%

Structure and stellar content of dwarf galaxies

Parodi

Barazza

Binggeli

2002

A&A

View full text Add to dashboard Cite

show abstract

“…To date (O'Neil, Bothun, & Schombert 1998 and references therein), three main classes of LSB galaxies have been identified: (1) dwarfs, defined by objects with scale lengths 1 kpc; (2) disk galaxies with scale lengths 1 5 kpc and circular velocities in the range 80-200 km s À1 ; and (3) giant disk galaxies with scale lengths !5 kpc. Dwarf LSBs include both irregular (dI) and more regular spiral (dS) galaxies (Sung et al 1998;Schombert et al 2001). Dwarf LSB galaxies have much in common with blue compact dwarfs (BCDs): a large amount of H i, often with small OB associations, and blue colors (BÀV $ 0.5 mag).…”

Section: Introductionmentioning

confidence: 99%

“…But dwarf irregulars are distinguished from BCDs by having amorphous shapes, as well as by having star-forming regions that are not centrally concentrated. Also, dwarf LSBs are known to have higher total masses (within a given surface brightness) and larger linear diameters than BCDs (Sung et al 1998). Meanwhile, normal-size or giant LSBs are more similar to late-type spiral galaxies in their general properties, except in overall low stellar density.…”

Section: Introductionmentioning

confidence: 99%

Low Surface Brightness Galaxies and the Tully-Fisher Relation

Chung

Gorkom

O'Neil

et al. 2002

The Astronomical Journal

View full text Add to dashboard Cite

We present Very Large Array (VLA) H i imaging of four low surface brightness (LSB) galaxies ([OBC97] P01-3, [OBC97] C06-1, [OBC97] C04-1, [OBC97] C04-2), 1 which were thought to strongly deviate from the Tully-Fisher (TF) relation based on Arecibo single-dish observations. We do not detect three of the four targeted low surface brightness galaxies (LSBs) in H i down to a 4 limit of 0.08 Jy km s À1 . We find that two of the four of these LSBs have bright galaxies at projected distances of 2<6 and 2<9, which have contaminated the Arecibo signal. A further examination of the Arecibo sample shows that five out of the six galaxies that were found to deviate from the TF relation have nearby bright galaxies (within 3<5 and within the observed H i velocity range), and we conclude that possibly all but one of the non-TF galaxies are contaminated by H i from nearby galaxies. The sixth galaxy was not detected by us. A new observation by Arecibo did not confirm the earlier detection. We present the H i properties, kinematics, and rotation curves of three bright galaxies NGC 7631, KUG 2318+078, NGC 2595 which happened to be in the LSB fields and of two LSB galaxies, one of the targeted ones C04-2 and one (UGC 12535 or P01-1) that was found in the field of P01-3. The two detected LSB galaxies fall within 2 on the TF relation. The integrated profiles of the bright galaxies are consistent with the Arecibo results both in velocity range and amplitude, which indicates that most of the extreme deviators from the TF relation must have been affected by bright companions in this earlier H i survey. A more recent determination of the sidelobe structure of the Arecibo beam supports our conclusion and shows that the degree of sidelobe contamination was much larger than could have been initially predicted. If the now unknown velocities of these nondetected LSB's are within our probed velocity range then the limit to their H i mass is roughly 10 8 M assuming H 0 = 75 km s À1 Mpc À1 . Hence, we have corrected the results found in O'Neil et al. (2000a) and have reconstructed the TF relation. These new observations then show (1) a reconstructed TF relation that has relatively large scatter at all values of rotational velocity (possibly indicating the true range in disk galaxy properties) and (2) the presence of at least some red, gas-poor, LSB disks that indeed may be in an advanced evolutionary state as the faded remnants of their former high surface brightness actively star-forming state.

show abstract

“…More recently, Sung et al (1998) have argued that BCDGs and dEs have similar intrinsic shapes, i.e. their axis ratios show a similar distribution.…”

Section: Introductionmentioning

confidence: 99%

Multi-spectral study of a new sample of Blue Compact Dwarf Galaxies

Doublier

Caulet

Comte

1999

Astron. Astrophys. Suppl. Ser.

View full text Add to dashboard Cite

Abstract. We present the results of surface photometry on a new sample of Blue Compact Dwarf galaxies (BCDGs), in continuation to a previous paper (Doublier et al. 1997, hereafter Paper I). The 22 galaxies (plus two companions) discussed in the present paper have been selected in the Southern Hemisphere, from several lists. An atlas containing isophotal maps, surface brightnesses and B − R color profiles of the sample is given, together with the tables containing the photometric parameters.The results are consistent with those obtained in Paper I for objects selected from the Byurakan Surveys in the Northern hemisphere. Similarly, we find about one fourth of the BCDGs showing a dominant r 1/4 brightness distribution component, one fourth of the BCDG showing a dominant exponential surface brightness profile, and about half of them show composite brightness distributions. Integrated properties, colors, mean surface brightnesses and luminosity-radius relations are investigated and discussed for the objects presented in this paper and Paper I. We found that r 1/4 BCDGs tend to show a different behaviour compared to the exponential BCDGs, with respect to colors, compactness and luminosity-radius relations. We also include a brief study of the surroundings of the galaxies, where we find several candidate companions.Key words: galaxies: compact -galaxies: photometrygalaxies: starburst -galaxies: structure Send offprint requests to: V. Doublier Based on observations collected at the 1.54 m Danish Telscope at the European Southern observatory (La Silla, Chile).

show abstract

The Intrinsic Shapes of Low Surface Brightness Dwarf Irregular Galaxies and Comparison to Other Types of Dwarf Galaxies

Cited by 46 publications

References 36 publications

Structure and stellar content of dwarf galaxies

Structure and stellar content of dwarf galaxies

Low Surface Brightness Galaxies and the Tully-Fisher Relation

Multi-spectral study of a new sample of Blue Compact Dwarf Galaxies

Contact Info

Product

Resources

About