The Data Pages

This page provides access to electronic format data of various sorts which may be of interest to other astronomers. If you make use of the information here, citation to the corresponding journal article is, of course, appreciated. If the data format is not immediately obvious to you, here is a brief explanatory note.

Recent Postings: See the sections on Rotation Curves, the Milky Way, the Dark Matter Distribution, and the Mass Discrepancy-Acceleration Relation.

THESIS PROJECTS

A Large Survey for Very Low Surface Brightness Galaxies: James Marshall, Ph.D. 2004
High Resolution Optical Velocity Fields of Low Surface Brightness Galaxies and the Density Profiles of Dark Matter Halos: Rachel Kuzio de Naray, Ph.D. 2007
Star Formation History of Low Surface Brightness Galaxies: Ji Hoon Kim, Ph.D. 2007

Warning: these files are large.

DATA SECTION

The Rotation Curves of Low Surface Brightness Galaxies
- The rotation curves derives from two dimensional velocity fields observed with densepak.
- The data: densepak rotation curves.
- Mass Models of Low Surface Brightness Galaxies with High Resolution Optical Velocity Fields
  Kuzio de Naray, R., McGaugh, S.S., & de Blok, W.J.G. 2008, ApJ, 676, 920
- High Resolution Optical Velocity Fields of 11 Low Surface Brightness Galaxies
  Kuzio de Naray, R., McGaugh, S.S., de Blok, W.J.G., & Bosma, A. 2006, ApJS, 165, 461
- The rotation curves of LSB galaxies with long slit Halpha observations. A subset also have 21 cm data and mass models (the rotation due to the luminsous mass components, stars & gas).
- The data: Halpha position-velocity data.
- High-resolution rotation curves of low surface brightness galaxies: Data
  McGaugh, S.S., Rubin, V.C., & de Blok, W.J.G. 2001, AJ, 122, 2381
- The data: Smoothed hybrid Halpha-HI rotation curves.
- High-resolution rotation curves of low surface brightness galaxies: Mass Models
  de Blok, W.J.G., McGaugh, S.S., & Rubin, V.C. 2001, AJ, 122, 2396
- Older rotation curves:
  HI Observations of Low Surface Brightness Galaxies: Probing Low Density Galaxies
  de Blok, W.J.G., McGaugh, S.S., & van der Hulst, J.M. 1996, MNRAS, 283, 18.
The Baryonic Tully-Fisher Relation
- Disk galaxies obey a relation between between disk mass (stars + gas) and rotation velocity (V_flat) over at least 5 decades in stellar mass.
- Updated Calibration: M_d = 50 V⁴.
  The updated calibration uses only data where V_flat has been measured.
- The data from The Baryonic Tully-Fisher Relation of Galaxies with Extended Rotation Curves and the Stellar Mass of Rotating Galaxies, McGaugh, S.S. 2005, ApJ, 632, 859.
- Original paper:
  The Baryonic Tully-Fisher Relation
  McGaugh, S.S., Schombert, J.M., Bothun, G.D., & de Blok, W.J.G. 2000, ApJ, 533, L99
- The data used in the original paper.
The Mass Discrepancy-Acceleration Relation
- Disk galaxies obey a relation between between the amplitude of the mass discrepancy (defined as the square of the ratio of the actual velocity to that expected for the baryons) and the acceleration.
- The Data from Figure 5 of
  The Mass Discrepancy-Acceleration Relation: Disk Mass and the Dark Matter Distribution
  McGaugh, S.S. 2004, ApJ, 609, 652.
  There is a separate data file for each of the 8 panels of the figure, correpsonding to the different assumptions about stellar mass.
Dark Matter Distribution
- Mass models used in McGaugh et al. 2007, ApJ, 659, 149.
- The Data.
- Tabulated for each galaxy are the radius (in kpc), the observed velocity (in km/s), the velocity due to the gas mass, the velocity of the stellar mass for the MDacc M/L, and the scaling factors to obtain the maximum disk M/L (Qmax) and population synthesis M/L (Qpop).
CCD Images of Low Surface Brightness Galaxies
- FITS format CCD data with images of numerous LSB galaxies in UBVI and Halpha. The data have been flattened, etc.
- The data.
- The Morphology of Low Surface Brightness Disk Galaxies
  McGaugh, S.S., Schombert, J.M., & Bothun, G.D. 1995, AJ, 109, 2019
- Structural Characteristics and Stellar Composition of Low Surface Brightness Disk Galaxies
  McGaugh, S.S., & Bothun, G.D. 1994, AJ, 107, 530

MODEL SECTION

Milky Way Mass Models
- Models of the radial run of stellar and gas surface density and rotation velocity in the Milky Way.
- See McGaugh (2008) for details.
- Models are given by disk scale length:
- 2.0 | 2.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.7 | 3.0 | 3.5 | 4.0
- Model fit to terminal velocity curve: bumps & wiggles
Cosmological Parameters from Rotation Curves
- The concentrations of galaxy halos are related to the cosmology in which they form.
- c = 1.88 + 23.9 s₈ G_0.6
  where s₈ is the normalization of the power spectrum and G_0.6 is a modified shape parameter (see eqn 3 of the paper).
- Data set the limit s₈ G_0.6 < 0.23.
- A Limit on the Cosmological Mass Density and Power Spectrum from the Rotation Curves of Low Surface Brightness Galaxies
  McGaugh, S.S., Barker, M.K., & de Blok, W.J.G. 2003, ApJ, 584, 566
Cosmic Microwave Background
- Purely baryonic model for the ripples in the microwave background which successfully predicted the amplitude of the second peak.
- Confrontation of Modified Newtonian Dynamics Predictions with WMAP First Year Data
  McGaugh, S.S. 2004, ApJ, 611, 26
- The model results, 2004.
- BOOMERanG Data Suggest a Purely Baryonic Universe
  McGaugh, S.S. 2000, ApJ, 541, L33
- The model results, 2000.
- Distinguishing Between CDM and MOND: Predictions for the Microwave Background
  McGaugh, S.S. 1999, ApJ, 523, L99
HII Region Abundances
- Models and methods for extracting oxygen abundance data from HII region spectra by use of the R₂₃ method of Pagel.
- Still the most accurate calibration around.
- Oxygen Abundances and Chemical Evolution in Low Surface Brightness Galaxie
  Kuzio de Naray, R., McGaugh, S.S., & de Blok, W.J.G. 2004, MNRAS, 2004, MNRAS, 355, 887
- Provides a convenient method by which O₃₂-R₂₃ data can be fed into simple analytic formulas which return log(O/H) and log(U).
- HII Region Abundances: Model Oxygen Line Ratios
  McGaugh, S.S. 1991, ApJ, 380, 140
- The model results.
- The model HII region grid can be used to generate useful diagrams like the O₃₂-R₂₃ grid (figure) from which abundances and ionization parameters can be determined, e.g.,
- Oxygen Abundances in Low Surface Brightness Disk Galaxies
  McGaugh, S.S. 1994 ApJ, 426, 135
Tabulated values of the Bessel functions which appear in the equation for the rotation curve of an exponential disk (Freeman 1970). These sometimes come in handy.

These pages are provided and maintained by Stacy McGaugh

This material is based in part upon work supported by the National Science Foundation under Grant AST0505956.