J/ApJ/743/146 HST/WFC3 observations in HUDF and GOODS-S (Cameron+, 2011)
Active and passive galaxies at z ∼ 2: rest-frame optical morphologies with WFC3.
Cameron E., Carollo C.M., Oesch P.A., Bouwens R.J., Illingworth G.D.,
Trenti M., Labbe I., Magee D.
<Astrophys. J., 743, 146 (2011)>
=2011ApJ...743..146C 2011ApJ...743..146C
ADC_Keywords: Photometry, HST ; Photometry, infrared ; Redshifts ;
Galaxies, photometry ; Cross identifications
Keywords: galaxies: evolution - galaxies: formation - galaxies: high-redshift
Abstract:
We use the high angular resolution in the near-infrared of the Wide
Field Camera 3 (WFC3) on the Hubble Space Telescope to determine YHVz
color-color-selection criteria to identify and characterize 1.5<z<3.5
galaxies in the Hubble Ultra Deep Field 2009 (HUDF09) and Early
Release Science (GOODS-South) fields. The WFC3 NIR images reveal
galaxies at these redshifts that were undetected in the rest-frame UV
HUDF/GOODS images, as well as true centers and regular disks in
galaxies classified as highly irregular in rest-frame UV light. Across
the 1.5<z<2.15 redshift range, regular disks are unveiled in the WFC3
images of ∼25% of both intermediate and high mass galaxies, i.e.,
above 1010M☉. Meanwhile, galaxies maintaining diffuse and/or
irregular morphologies in the rest-frame optical light - i.e., not yet
dynamically settled - at these epochs are almost entirely restricted
to masses below 1011M☉. In contrast at 2.25<z<3.5 these
diffuse and/or irregular structures overwhelmingly dominate the
morphological mix in both the intermediate and high mass regimes,
while no regular disks, and only a small fraction (∼25%) of smooth
spheroids, are evident above 1011M☉. Strikingly, by 1.5<z<2.25
roughly two out of every three galaxies at the highest masses are
spheroids. In our small sample, the fraction of star-forming galaxies
at these mass scales decreases concurrently from ∼60% to ∼5%. If
confirmed, this indicates that z∼2 is the epoch of both the
morphological transformation and quenching of star formation which
assemble the first substantial population of massive ellipticals.
Description:
The HUDF09 program (Bouwens et al. 2010ApJ...709L.133B 2010ApJ...709L.133B) now in
progress will observe a ∼4.7arcmin2 central region of the HUDF
(Beckwith et al. 2006, Cat. J/AJ/132/1729) with the new WFC3 on the
HST for a total of 96 orbits. The exposure time is divided between
three NIR filters: Y105 (F105W), J125 (F125W), and H160 (F160W).
Rebinning of the HUDF ACS B435 (F435W), V606 (F606W), i775
(F775W), and z850 (F850LP) images to the scale of our WFC3 frames
was also performed to facilitate aperture-matched photometry.
The ERS program has observed a northern section of the GOODS-South
field (Giavalisco et al. 2004, Cat. II/261) in the WFC3/IR channel in
10 pointings for a total of 60 orbits (see Windhorst et al.
2011ApJS..193...27W 2011ApJS..193...27W). The exposure time was divided evenly between
three NIR filters: Y098 (F098M), J125 (F125W), and H160 (F160W),
reaching a depth of ∼27.5mag (in a 0.2" radius aperture) over an area
of ∼40arcmin2. The GOODS ACS B435 (F435W), V606 (F606W), i775
(F775W), and z850 (F850LP) images were again rebinned to the same
scale as the reduced WFC3 frames.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
erscat.dat 189 3078 ERS (Early Release Science) source catalog
udfcat.dat 189 1052 HUDF09 (Hubble Ultra Deep Field 2009)source catalog
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJ/738/69 : SEDs of galaxies at 3.8<z<5 in GOODS (Shim+, 2011)
J/A+A/511/A50 : JHks of GOODS-South field (Retzlaff+, 2010)
J/ApJ/706/1364 : SINS survey of z∼2 galaxies (Forster Schreiber+, 2009)
J/A+A/504/751 : GOODS-MUSIC catalog updated version (Santini+, 2009)
J/ApJ/695/1591 : Spectrophotometry in PEARS fields (Pirzkal+, 2009)
J/ApJ/682/985 : FIREWORKS photometry of GOODS CDF-S (Wuyts+, 2008)
J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)
J/A+A/449/951 : GOODS-MUSIC sample: multicolour catalog (Grazian+, 2006)
J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)
J/A+A/454/423 : GOODS-South Field VLT/FORS2 redshifts. II. (Vanzella+, 2006)
J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005)
J/AJ/130/1 : Catalog of source parameters in NICMOS UDF (Thompson+, 2005)
J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005)
J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)
J/AJ/122/2205 : HDF-South K photometric redshift catalog (Rudnick+, 2001)
Byte-by-byte Description of file: erscat.dat udfcat.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Cat [ERS UDF] Catalog name: ERS or UDF (1)
4- 7 I04 --- IDc Running number within catalog ID (1)
10- 18 F9.6 deg RAdeg Right ascension in decimal degrees (J2000)
20- 29 F10.6 deg DEdeg Declination in decimal degrees (J2000)
31- 36 F6.3 mag H160 HST/WFC3 F160W Kron magnitude (AB) (2)
39- 43 F5.3 mag e_H160 Hmag uncertainty (2)
46- 51 F6.3 arcsec Rad H160 Kron radius (2)
53- 57 F5.3 --- Ell H160 ellipticity (1-b/a) (2)
59- 64 F6.2 deg PA [-90/90] H160 position angle (for images
aligned as west=0deg and north=90deg) (2)
66- 70 F5.3 --- Star [0/1] H160 stellarity parameter (1=star) (2)
72- 77 F6.3 mag B435 ?=99 HST/ACS F435W Kron magnitude (AB) (2)
79- 84 F6.3 mag e_B435 ?=99 B435 uncertainty (2)
86- 91 F6.3 mag V606 ?=99 HST/WFC3 F606W Kron magnitude (AB) (2)
93- 98 F6.3 mag e_V606 ?=99 V606 uncertainty (2)
100-105 F6.3 mag i775 ?=99 HST/WFC3 F775W Kron magnitude (AB) (2)
107-112 F6.3 mag e_i775 ?=99 i775 rms error in Kron magnitude (2)
114-119 F6.3 mag z850 ?=99 HST/WFC3 F850LP Kron magnitude (AB) (2)
121-126 F6.3 mag e_z850 ?=99 z850 rms error in Kron magnitude (2)
128-133 F6.3 mag Ymag ?=99 Y105/098 Kron magnitude (AB)
(HST/WFC3 F105W in HUDF09, F098M in ERS) (2)
135-140 F6.3 mag e_Ymag ?=99 Ymag uncertainty (2)
142-147 F6.3 mag J125 ?=99 HST/WFC3 F125W Kron magnitude (AB) (2)
149-154 F6.3 mag e_J125 ?=99 J125 RMS error in Kron magnitude (2)
157 I1 --- GM [0/1] GOODS-MUSIC match flag (1=matched)
159-163 I5 --- GOODS ?=0 GOODS-MUSIC (Cat. J/A+A/449/951) ID
(<GOODS-MUSIC NNNNN> in Simbad)
165 I1 --- GMA [0/1] GOODS-MUSIC area flag (0=not in area,
1=in area)
167 I1 --- SN [0/1] Object appears in a high signal-to-noise
region in all seven band flags (1=in high S/N
region, 0=not in high S/N region) (3)
169 I1 --- C [0/1] Flag if GOODS-MUSIC catalog spectroscopic
redshift is strongly in conflict with the
observed color (0=okay, 1=in conflict)
171 I1 --- cl Star-galaxy flag (0=galaxy, 1=spectroscopically
confirmed star, 2=candidate star)
173-177 F5.3 --- zph [0.003/7] ZEBRA photometric redshift
179-184 F6.1 --- chi2 χ2 of photometric redshift template fit
186-187 I2 --- NF [3/15] Number of filters used in photometric
redshift template fit
189 I1 --- Sel [0/1] Passive YHVz selection flag
(0=not in selection, 1=in selection)
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Note (1): identified as <[CCO2011] AAANNNN> in Simbad, where "AAA" is
"ERS" or "UDF".
Note (2): Parameters in Columns 4-21 derived from SExtractor output; see
Bertin & Arnouts (1996A&AS..117..393B 1996A&AS..117..393B) for detailed definitions.
Note (3): Regions of "high signal-to-noise" imaging defined as the area on
each frame with local median RMS less than twice the global median RMS.
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History:
14-May-2013: copied at http://www.astro.phys.ethz.ch/cameronetal2011/
(End) Emmanuelle Perret [CDS] 14-May-2013