J/MNRAS/428/1460 Massive early-type galaxies (Buitrago+, 2013)
Early-type galaxies have been the predominant morphological class for massive
galaxies since only z ∼ 1.
Buitrago F., Trujillo I., Conselice C.J., Haussler B.
<Mon. Not. R. Astron. Soc., 428, 1460-1478 (2013)>
=2013MNRAS.428.1460B 2013MNRAS.428.1460B
ADC_Keywords: Galaxies, nearby ; Redshifts ; Morphology
Keywords: galaxies: evolution - galaxies: high-redshift - galaxies: structure
Abstract:
Present-day massive galaxies are composed mostly of early-type
objects. It is unknown whether this was also the case at higher
redshifts. In a hierarchical assembling scenario the morphological
content of the massive population is expected to change with time from
disc-like objects in the early Universe to spheroid-like galaxies at
present. In this paper we have probed this theoretical expectation by
compiling a large sample of massive
(Mstellar≥1011h-270M☉) galaxies in the redshift interval
0<z<3. Our sample of 1082 objects comprises 207 local galaxies
selected from Sloan Digital Sky Survey plus 875 objects observed with
the Hubble Space Telescope belonging to the Palomar Observatory
Wide-field InfraRed/DEEP2 and GOODS NICMOS Survey surveys. 639 of our
objects have spectroscopic redshifts. Our morphological classification
is performed as close as possible to the optical rest frame according
to the photometric bands available in our observations both
quantitatively (using the Sersic index as a morphological proxy) and
qualitatively (by visual inspection). Using both techniques we find an
enormous change on the dominant morphological class with cosmic time.
The fraction of early-type galaxies among the massive galaxy
population has changed from ∼20-30 per cent at z∼3 to∼70 per cent at
z=0. Early-type galaxies have been the predominant morphological class
for massive galaxies since only z∼1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 103 207 Structural parameters from our massive (M>1011)
SDSS (z<0.03) galaxy sample
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See also:
J/MNRAS/382/109 : Massive galaxies in Extended Groth Strip (Trujillo+, 2007)
J/MNRAS/427/1666 : Massive galaxies in CANDELS-UDS field (Bruce+, 2012)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- SDSS SDSS unique objID number
20- 29 F10.6 deg RAdeg Right ascension (J2000)
31- 40 F10.6 deg DEdeg Declination (J2000)
42- 49 A8 --- Type Visual morphology: early, late or peculiar
51- 54 F4.2 --- z [0.02/0.03] Redshift
56- 59 F4.2 10+11Msun Mass Stellar mass (in 1011h70-2M☉ units)
61- 65 F5.2 mag gmag SDSS g magnitude (AB)
67- 70 F4.2 mag e_gmag rms uncertainty on gmag (AB)
72- 76 F5.2 kpc re Circularized effective radius
78- 81 F4.2 kpc e_re rms uncertainty on n
83- 86 F4.2 --- n Sersic index
88- 91 F4.2 --- e_n rms uncertainty on n
93- 96 F4.2 --- b/a [0/1] Axis ratio
98-103 F6.2 deg PA [-180/180] Position angle of major axis
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Aug-2013