J/ApJ/507/585 Hubble Deep Field galaxy morphology (Marleau+, 1998)
Quantitative morphology of galaxies in the Hubble Deep Field.
Marleau F.R., Simard L.
<Astrophys. J. 507, 585 (1998)>
=1998ApJ...507..585M 1998ApJ...507..585M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Morphology
Mission_Name: HST
Keywords: galaxies: evolution - galaxies: formation -
galaxies: fundamental parameters
Abstract:
We measure quantitative structural parameters of galaxies in the
Hubble deep field (HDF) on the drizzled F814W images. Our structural
parameters are based on a two-component surface brightness made up of
a Sirsic profile and an exponential profile. We compare our results to
the visual classification of van den Bergh et al. (1996,
Cat. J/AJ/112/359) and the C-A classification of Abraham et al.
(1996MNRAS.279L..47A 1996MNRAS.279L..47A). Our morphological analysis of the galaxies in
the HDF indicates that the spheroidal galaxies, defined here as
galaxies with a dominant bulge profile, make up for only a small
fraction, namely, 8%, of the galaxy population down to
mF814W(AB)=26.0. We show that the larger fraction of early-type
systems in the van den Bergh sample is primarily due to the difference
in classification of 40% of small round galaxies with half-light radii
less than 031. Although these objects are visually classified as
elliptical galaxies, we find that they are disk dominated with bulge
fractions less than 0.5. Given the existing large data set of HDF
galaxies with measured spectroscopic redshifts, we are able to
determine that the majority of distant galaxies (z>2) from this sample
are disk dominated. Our analysis reveals a subset of HDF galaxies that
have profiles flatter than a pure exponential profile.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 166 522 Best morphological parameter values and their
confidence limits for galaxies with
mF814W≤26.0 in the HDF
table2.dat 38 82 Sersic parameters and color gradients for
82 galaxies in the HDF
--------------------------------------------------------------------------------
See also:
J/AJ/112/359 : Galaxies in the Hubble Deep Field (van den Bergh+ 1996)
J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996)
J/A+AS/129/583 : Hubble Deep Field surface photometry (Fasano+ 1998)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 14 A13 --- [MS98b] Identification (hdchpxy)
16- 20 F5.2 mag mF814W F814W magnitude
22- 25 F4.2 mag E_mF814W Error on mF814W (Upper limit)
27- 30 F4.2 mag e_mF814W Error on mF814W (Lower limit)
32- 35 F4.2 --- B/T Bulge fraction (0 = pure disk system)
37- 40 F4.2 --- E_B/T Error on B/T (Upper limit)
42- 45 F4.2 --- e_B/T Error on B/T (Lower limit)
47- 50 F4.2 arcsec re Bulge effective radius
52- 55 F4.2 arcsec E_re Error on re (Upper limit)
57- 60 F4.2 arcsec e_re Error on re (Lower limit)
62- 65 F4.2 --- e Bulge ellipticity (1-b/a)
67- 70 F4.2 --- E_e Error on e (Upper limit)
72- 75 F4.2 --- e_e Error on e (Lower limit)
77- 83 F7.2 deg Phib Bulge position angle of the major axis
(clockwise, 0 = y-axis)
85- 90 F6.2 deg E_Phib Error on Phib (Upper limit)
92- 98 F7.2 deg e_Phib Error on Phib (Lower limit)
100-103 F4.2 arcsec rd Exponential disk scale length
105-108 F4.2 arcsec E_rd Error on rd (Upper limit)
110-113 F4.2 arcsec e_rd Error on rd (Lower limit)
115-119 F5.2 deg i Disk inclination (0 = face-on)
121-125 F5.2 deg E_i Error on i (Upper limit)
127-131 F5.2 deg e_i Error on i (Lower limit)
133-139 F7.2 deg Phid Disk position angle
141-145 F5.2 deg E_Phid Error on Phid (Upper limit)
147-152 F6.2 deg e_Phid Error on Phid (Lower limit)
154-157 F4.2 arcsec rh Half-light radius
159-163 F5.2 --- xi2R Reduced chi-square χ2R
165-166 I2 --- vdB ? van den Bergh (1996, Cat. J/AJ/112/359)
classification
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- [MS98b] Identification (hdchpxy)
15- 18 F4.2 --- n Sersic number
20- 23 F4.2 --- E_n Error on n (Upper limit)
25- 28 F4.2 --- e_n Error on n (Lower limit)
30- 34 F5.2 --- chi2R Sersic χ2R value
36 A1 --- (V-I)G [YN] (V-I) gradient
38 I1 --- vdB ? van den Berg (1996, Cat. J/AJ/112/359)
classification
--------------------------------------------------------------------------------
History: From electronic version
(End) James Marcout, Patricia Bauer [CDS] 09-Mar-1999