J/AJ/131/716 Hα scale length in Virgo and field spirals (Koopmann+, 2006)
A comparison of Hα and stellar scale lengths in Virgo and field spirals.
Koopmann R.A., Haynes M.P., Catinella B.
<Astron. J. 131, 716 (2006)>
=2006AJ....131..716K 2006AJ....131..716K
ADC_Keywords: Clusters, galaxy ; Morphology
Keywords: galaxies: clusters: general - galaxies: clusters: individual (Virgo) -
galaxies: formation - galaxies: fundamental parameters -
galaxies: spiral - galaxies: structure
Abstract:
The scale lengths of the old stars and ionized gas distributions are
compared for similar samples of Virgo Cluster members and field spiral
galaxies via Hα and broad R-band surface photometry. While the
R-band and Hα scale lengths are, on average, comparable for the
combined sample, we find significant differences between the field and
cluster samples. While the Hα scale lengths of the field
galaxies are a factor of 1.14±0.07 longer, on average, than their
R-band scale lengths, the Hα scale lengths of Virgo Cluster
members are, on average, 20% smaller than their R-band scale lengths.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 110 103 Properties of sample galaxies
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See also:
VII/26 : Uppsala General Catalogue of Galaxies (UGC) (Nilson 1973)
VII/34 : ESO/Uppsala Survey of the ESO(B) Atlas (Lauberts 1982)
VII/51 : Revised Shapley-Ames Catalog of Bright Galaxies (Sandage+ 1981)
VII/62 : Morphological Cat. of Gal. (MCG)
(Vorontsov-Velyaminov+, 1962-1974)
VII/155 : Third Reference Cat. of Bright Galaxies (RC3)
(de Vaucouleurs+ 1991)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Region Galaxy region (Field or Virgo)
7- 13 A7 --- Name The NGC/IC identification
15- 23 A9 --- OName Other identification (1)
25- 31 A7 --- RSA RSA morphological classification (2)
33- 41 A9 --- RC3 RC3 morphological classification (2)
43- 47 F5.2 mag Bmag RC3 total, face-on blue magnitude
48 A1 --- u_Bmag Uncertainty flag in Bmag
50- 54 F5.3 --- b/a Axial ratio
55 A1 --- u_b/a Uncertainty flag in b/a
57- 58 I2 deg Incl Line of sight inclination (3)
60- 63 F4.1 Mpc Dist Distance (4)
65- 69 F5.2 --- ? The HI deficiency content parameter (5)
71- 73 I3 arcsec rHa95 Radius containing 95% of total Hα flux
75- 77 I3 arcsec rR ? The R disk scale length
79- 80 I2 arcsec e_rR ? Error in rR
82- 84 I3 arcsec ra(1-3rR) ? Hα disk scale length in
the 1-3rR interval
86- 88 I3 arcsec e_ra(1-3rR) ? Error in ra(1-3rR)
89 A1 --- f_ra(1-3rR) [d*] Flag on ra(1-3rR) (6)
91- 93 I3 arcsec ra(1-2rR) ? Hα disk scale length in
the 1-2rR interval
95- 96 I2 arcsec e_ra(1-2rR) ? Error in ra(1-2rR)
97 A1 --- f_ra(1-2rR) [d*] Flag on ra(1-2rR) (6)
99-101 I3 arcsec ra(rR-rs) ? Hα disk scale length in
the rR-rs interval
103-105 I3 arcsec e_ra(rR-rs) ? Error in ra(rR-rs)
106 A1 --- f_ra(rR-rs) [d] Flag on ra(rR-rs) (6)
108-110 I3 arcsec rmax ? Hα rotation curve maximum extent
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Note (1): From the UGC (Nilson 1973, Cat. VII/26), ESO (Lauberts 1982,
Cat. VII/34), or MCG (Vorontsov-Velyaminov & Arhipova 1968,
Cat. VII/62) catalogs. MCG designations are abbreviated to eight
characters.
Note (2): We list here only the basic type, i.e. we drop from the name
luminosity class and other details. The RSA morphological type is from
the Revised Shapley Ames Catalog (Cat. VII/51), Binggeli et al.
(1985, Cat. J/AJ/90/1681), or Sandage & Bedke (1994, the Carnegie
Atlas of Galaxies). The RC3 morphological type is from the Third
Reference Catalogue (Cat. VII/155).
Note (3): Calculated using the Hubble (1926ApJ....64..321H 1926ApJ....64..321H) conversion.
Note (4): A mean Virgo distance of 16.6Mpc is assigned to all cluster members;
for field objects, the distance is calculated from the Virgo infall
model of Tonry et al. (2000ApJ...530..625T 2000ApJ...530..625T).
Note (5): The parameter adopts the commonly used definition of relative
HI content that compares the observed HI mass for a given galaxy with
that expected for the average, isolated galaxy of similar optical
linear size and morphological type. It corresponds to the "HI
deficiency" parameter of Haynes & Giovanelli (1984AJ.....89..758H 1984AJ.....89..758H).
Positive values indicates relative gas poorness.
Note (6): Flag on ra(1-3rR), ra(1-2rR) and ra(rR-rs), defined as follows:
d = Scale lengths with measurement errors larger than 20%;
* = Scale length fit produced a negative or zero value (clearly unphysical).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 14-Nov-2006