J/ApJ/680/70 Distant spheroids in the GOODS fields (Macarthur+, 2008)
The evolutionary history of galactic bulges: photometric and spectroscopic
studies of distant spheroids in the GOODS fields.
MacArthur L.A., Ellis R.S., Treu T., U V., Bundy K., Moran S.
<Astrophys. J., 680, 70-91 (2008)>
=2008ApJ...680...70M 2008ApJ...680...70M
ADC_Keywords: Galaxies, spectra ; Redshifts ; Photometry, HST ; Morphology ;
Velocity dispersion
Keywords: cosmology: observations - galaxies: bulges - galaxies: evolution -
galaxies: formation - galaxies: high-redshift
Abstract:
We report on the first results of a new study aimed at understanding
the diversity and evolutionary history of distant galactic bulges in
the context of now well-established trends for pure spheroidal
galaxies. To this end, bulges have been isolated for a sample of 137
spiral galaxies within the redshift range 0.1<z<1.2 in the GOODS
fields. Using proven photometric techniques, we determine the
characteristic parameters (size, surface brightness, profile shape) of
both the disk and bulge components in our sample. In agreement with
earlier work that utilized aperture colors, distant bulges show a
broader range of optical colors than would be the case for passively
evolving populations. To quantify the amount of recent star formation
necessary to explain this result, we used DEIMOS to secure stellar
velocity dispersions for a sizeable fraction of our sample. This has
enabled us to compare the fundamental plane of our distant bulges with
that for spheroidal galaxies in a similar redshift range.
Description:
The primary data set for this study is the GOODS public v1.0 data
release (Giavalisco et al., 2004, Cat. II/261), which provides deep
imaging in four ACS passbands: F435W (B), F606W (V), F775W (i), and
F850LP (z). The spectroscopic observations used here were taken with
DEIMOS on the Keck II Telescope. The data set comprises a total
exposure time of 5-7hr spanning three observing campaigns in 2004
March, 2004 December, and 2005 March. Most of the data were obtained
in seeing conditions in the range of 0.8"-1.0" (FWHM).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 193 Galaxy sample parameters
table3.dat 70 193 Spheroid photometric parameters
table4.dat 73 147 Fundamental plane parameters
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See also:
II/261 : GOODS initial results (Giavalisco+, 2004)
VII/246 : GOODS Morphological Catalog (Bundy+, 2005)
J/ApJ/551/111 : HDF early-type and spiral galaxies (Ellis+, 2001)
J/ApJS/157/175 : DEEP Groth Strip Survey. VIII. (Koo+, 2005)
J/ApJ/633/174 : Spheroidals and bulge dominated galaxies (Treu+, 2005)
J/ApJ/635/243 : Sample of GOODS/CDFS early-type galaxies (Ferreras+, 2005)
J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [TEL2005] Internal galaxy identification (1)
6- 15 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
17- 26 F10.6 deg DEdeg Declination in decimal degrees (J2000)
28- 33 F6.4 --- z Spectroscopic redshift
35- 36 I2 --- T Treu et al. (2005ApJ...622L...5T 2005ApJ...622L...5T; 2005, Cat.
J/ApJ/633/174) morphology type
38 I1 --- Nc [1,2] Number of components in decomposition (2)
40- 44 F5.3 --- B/T Bulge-to-total luminosity ratio
46- 50 F5.2 mag Bmag ? HST/ACS F435W filter AB magnitude
52- 56 F5.2 mag Vmag HST/ACS F606W filter AB magnitude
58- 62 F5.2 mag imag HST/ACS F775W filter AB magnitude
64- 68 F5.2 mag zmag HST/ACS F850LP filter AB magnitude
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Note (1): The first object named [TEL2005] 793 in the table, at
53.131104-27.829250 is in fact GOODS J033231.47-274945.3. The second
object [TEL2005] 793 is indeed at 189.235962+62.205502.
Note (2): Number of Sersic profiles:
1 = single Sersic profile in fit;
2 = simultaneous Sersic bulge plus exponential disk decomposition.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [TEL2005] Internal galaxy identification
6- 8 F3.1 --- nB ? F435W band Sersic n shape parameter
10- 13 F4.2 arcsec reB ? F435W band effective radius
15- 19 F5.2 mag/arcsec2 mueB ? F435W band uncorrected effective surface
brightness
21- 23 F3.1 --- nV ? F606W band Sersic n shape parameter
25- 28 F4.2 arcsec reV ? F606W band effective radius
30- 34 F5.2 mag/arcsec2 mueV ? F606W band uncorrected effective surface
brightness
36- 38 F3.1 --- ni ? F775W band Sersic n shape parameter
40- 43 F4.2 arcsec rei ? F775W band effective radius
45- 49 F5.2 mag/arcsec2 muei ? F775W band uncorrected effective surface
brightness
51- 53 F3.1 --- nz ? F850LP band Sersic n shape parameter
55- 58 F4.2 arcsec rez ? F850LP band effective radius
60- 64 F5.2 mag/arcsec2 muez ? F850LP band uncorrected effective surface
brightness
66- 70 F5.2 mag V-i ? Observed (F606W-F775W) color index
measured to one effective radius
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [TEL2005] Internal galaxy identification
6- 8 F3.1 --- n Sersic n shape parameter
10- 12 F3.1 --- e_n Error in n
14- 17 F4.2 kpc Re Effective radius
19- 22 F4.2 kpc e_Re Error in Re
24- 28 F5.2 mag/arcsec2 SBe Average restframe B-band surface
brightness within Re
30- 33 F4.2 mag/arcsec2 e_SBe Error in SBe
35- 39 F5.1 km/s sigma Velocity dispersion in 1x0.1185"
aperture
41- 44 F4.1 km/s e_sigma Error in sigma
46- 51 F6.2 mag BMAG Total restframe spheroid B-band AB
absolute magnitude
53- 57 F5.2 [Msun/solLum] logM/L Log of total spheroid B band
mass-to-light ratio
59- 62 F4.2 [Msun/solLum] e_logM/L Error in logM/L
64- 68 F5.2 [Msun] logM Log of spheroid dynamical stellar mass
70- 73 F4.2 [Msun] e_logM Error in logM
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Oct-2010