J/AJ/129/2119 Properties for 165 dwarf galaxies (Spekkens+, 2005)
The cusp/core problem in galactic halos: long-slit spectra for a large dwarf
galaxy sample.
Spekkens K., Giovanelli R., Haynes M.P.
<Astron. J., 129, 2119-2137 (2005)>
=2005AJ....129.2119S 2005AJ....129.2119S
ADC_Keywords: Galaxies, spectra ; Radial velocities ; Rotational velocities
Keywords: dark matter - galaxies: dwarf - galaxies: halos -
galaxies: kinematics and dynamics - galaxies: structure
Abstract:
We derive inner dark matter halo density profiles for a sample of 165
low-mass galaxies using rotation curves obtained from high-quality,
long-slit optical spectra assuming minimal disks and spherical
symmetry.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 165 Sample properties and measured inner halo slopes
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Name The object UGC/AGC name (1)
8- 9 I2 h RAh Hour of Right Ascension (J2000)
11- 12 I2 min RAm Minute of Right Ascension (J2000)
14- 17 F4.1 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 27 I2 arcsec DEs Arcsecond of Declination (J2000)
29- 33 I5 km/s HRV Heliocentric optical radial velocity (2)
35- 37 I3 Mpc Dist Distance (3)
39- 42 F4.1 mag Imag Total apparent I band magnitude (4)
44- 48 F5.1 arcsec Ro Optical radius (5)
50- 53 F4.1 mag/arcsec2 SB Extrapolated I band disk central
surface brightness (6)
55- 56 I2 deg Inc Inclination (7)
58- 60 I3 km/s Vrot Rotational velocity (8)
62- 64 I3 km/s Vo Best fit polyex curve amplitude (9)
66- 69 F4.1 arcsec rpe Best fit polyex curve scale-length (9)
71- 75 F5.2 arcsec beta Best fit polyex curve outer RC slope (9)
77- 80 F4.2 --- alpha Measured inner slope value (10)
82- 85 F4.2 --- e_alpha Error in alpha
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Note (1): Uppsala General Catalogue (Nilson 1973, Cat. VII/26) number where
available, or else our private Arecibo General Catalogue database
number.
Note (2): Measured from best-fit URC curve to long-slit data. See section 3.
Note (3): Computed from VSol and (RA, Dec) using the multi-attractor flow
model of Tonry et al. 2000ApJ...530..625T 2000ApJ...530..625T, with H0=70km/s/Mpc.
Note (4): Extrapolated to 8 optical scale-lengths
(Haynes et al. 1999AJ....117.1668H 1999AJ....117.1668H).
Note (5): Radius encompassing 83% of the total I-band light
(Haynes et al. 1999AJ....117.1668H 1999AJ....117.1668H).
Note (6): Corrected for inclination (Haynes et al. 1999AJ....117.1668H 1999AJ....117.1668H).
Note (7): Obtained from the I-band disk ellipticity
(Haynes et al. 1999AJ....117.1668H 1999AJ....117.1668H) assuming an intrinsic disk axial
ratio of 0.2.
Note (8): Taken as the velocity of the best-fit polyex curve at Radopt;
see the "Note (9)" section below and Eq.(2) of paper.
Note (9): the polyex relates the rotation curve (RC) as (Eq. 2):
V(r) = Vo (1 - exp(-r/rpe)) (1 + beta r / rpe)
Note (10): the inner profile (for low values of r) define the density profile
ρ(r) ∝ r-alpha
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 06-Sep-2005