J/ApJ/881/42 HST phot. & GMOS spectra of Lynx E & W clusters (Jorgensen+, 2019)
The Gemini/HST galaxy cluster project: environment effects on the stellar
populations in the Lynx clusters at z = 1.27.
Jorgensen I., Hunter L.C., O'Neill C.R., Chiboucas K., Cole R.K., Toft S.,
Schiavon R.P.
<Astrophys. J., 881, 42 (2019)>
=2019ApJ...881...42J 2019ApJ...881...42J
ADC_Keywords: Photometry, HST; Spectra, optical; Clusters, galaxy; Redshifts;
Galaxies, spectra; Equivalent widths; Velocity dispersion;
X-ray sources
Keywords: galaxies: clusters: individual (Lynx E) ;
galaxies: clusters: individual (Lynx W) ; galaxies: evolution ;
galaxies: stellar content
Abstract:
Few detailed investigations of stellar populations in passive galaxies
beyond z∼1 are based on deep spectroscopic observations, due to the
difficulty in obtaining such data. We present a study of stellar
populations, structure, and mass-to-light ratios (M/L) of a large
sample of bulge-dominated galaxies in the two z=1.27 clusters Lynx E
and Lynx W, based on deep ground-based optical spectroscopy combined
with imaging from the Hubble Space Telescope. We find that Lynx E has
a well-defined core of red passive galaxies, while Lynx W lacks such a
core. If all the sample galaxies evolve similarly in size from z=1.27
to the present, the data would allow only 0.1dex size growth at a
fixed dynamical mass. However, to link the Lynx central galaxies to
brightest cluster galaxies similar to those of low-redshift clusters,
the Lynx galaxies would have to grow by at least a factor 5, possibly
through major merging. The M/L ratios and the Balmer absorption lines
of the Lynx galaxies are consistent with passive evolution of the
stellar populations from z=1.27 to the present and support ages of
1-3Gyr. The galaxies in the outskirts of the clusters contain younger
stellar populations than found in the cluster cores. However, when
evolved passively to z∼0 both populations are consistent with the
observed populations in the Coma cluster galaxies. The bulge-dominated
emission line galaxies in the clusters are dominated by stellar
populations with subsolar metallicities. Thus, additional enrichment
of these is required to produce Coma-like stellar populations by z∼0.
Description:
In our analysis we use available HST/ACS imaging in the filters F775W
and F850LP, obtained in 2004 through the HST program ID 9919. The
three pointings obtained for Lynx E and W cover all galaxies in our
spectroscopic sample. We have reprocessed the HST/ACS imaging since
our analysis of Lynx W in Jorgensen+ (2014, J/AJ/148/117).
Spectroscopy of Lynx E and W galaxies was obtained with the Gemini
Multi-Object Spectrograph (GMOS-N) on Gemini North. The observations
centered on Lynx W are described in Jorgensen+ (2014). Similar
observations were obtained for a sample centered on Lynx E in the
period UT 2014 November 27 to 2015 January 12 under the Gemini
programs GN-2014B-Q-22 and GN-2014B-DD-4.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 62 2 Cluster properties
table7.dat 82 82 Lynx photometric parameters from HST/ACS data
table10.dat 112 29 Spectroscopic parameters
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJS/71/549 : Case low-dispersion Survey X. (Pesch+ 1989)
J/MNRAS/276/1341 : Spectroscopy of E and S0 galaxies (Jorgensen+, 1995)
J/A+AS/139/29 : Empirical calibration of the 4000 A break (Gorgas+, 1999)
J/ApJ/554/L129 : X-ray luminosity-velocity dispersion (Mahdavi+, 2001)
J/AJ/130/445 : X-ray-luminous galaxy cluster RX J0142.0+2131 (Barr+, 2005)
J/A+A/432/381 : VLT spectroscopic survey of RX J0152.7-1357 (Demarco+, 2005)
J/MNRAS/357/1357 : Large-scale clumpy structure in Lynx region (Nakata+, 2005)
J/AJ/131/1184 : A recalibration of opt. photometry (Maiz-Apellaniz+, 2006)
J/MNRAS/380/1449 : 1.4GHz radio sources in Lynx & Hercules (Rigby+, 2007)
J/ApJS/184/271 : Photometry of galaxies in 3 clusters (Chiboucas+, 2009)
J/A+A/499/47 : Lick indices of EDCSN galaxies (Sanchez-Blazquez+, 2009)
J/ApJ/724/714 : Veloc. dispersions of MS1054-03 & Coma gal. (Holden+, 2010)
J/A+A/524/A6 : Evolution of spectral early-type galaxies (Saglia+, 2010)
J/MNRAS/404/1639 : MILES base models & new line index system (Vazdekis+, 2010)
J/A+A/534/A109 : MCXC Meta-Catalog X-ray galaxy Clusters (Piffaretti+, 2011)
J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)
J/MNRAS/423/3652 : H imaging of XMMU J2235.3-2557 (Grutzbauch+, 2012)
J/ApJ/750/93 : NIR observations of XMM-LSS J02182-05102 (Papovich+, 2012)
J/ApJ/775/106 : CANDELS passive & massive early-type gal. (Cassata+, 2013)
J/AJ/145/77 : Imaging & spectroscopy in 3 gal. clusters (Jorgensen+, 2013)
J/MNRAS/441/203 : Massive quiescent ETG in clusters (Delaye+ 2014)
J/ApJ/788/72 : Observed sample of z∼0.7 massive galaxies (Gallazzi+, 2014)
J/AJ/148/117 : Imaging and spectroscopy in Lynx W (Jorgensen+, 2014)
J/MNRAS/448/3484 : ATLAS3D Project. XXX (McDermid+, 2015)
J/AJ/154/251 : Spectrosc. of gal. in z=0.2-0.9 clusters (Jorgensen+, 2017)
J/AJ/156/224 : Gemini/HST obs. in 4 massive clusters (Jorgensen+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Cluster Cluster name
8- 13 F6.4 --- z [1.26/1.271] Cluster redshift,
adopting BCGs as cluster centers (1)
15- 17 I3 km/s sigma [568/693] Cluster velocity dispersion,
adopting BCGs as cluster centers
19- 20 I2 km/s e_sigma [87/90] Negative uncertainty on sigma
22- 23 I2 km/s E_sigma [67/68] Positive uncertainty on sigma
25- 26 I2 --- Nmm [15/24] Number of member galaxies for
which spectroscopy is available,
adopting BCGs as cluster centers
28- 33 F6.4 --- zX [1.26/1.271] Cluster redshift,
adopting X-ray centers (2)
35- 37 I3 km/s sigmaX [580/706] velocity dispersion,
adopting X-ray centers (2)
39- 40 I2 km/s e_sigmaX [77/79] Negative uncertainty on sigmaX
42- 43 I2 km/s E_sigmaX [65/83] Positive uncertainty on sigmaX
45- 46 I2 --- NmmX [16/23] Number of member galaxies,
when adopting X-ray centers (2)
48- 51 F4.2 10+37W L500 [0.63/3.73] X-ray luminosity in the
0.1-2.4keV band within the radius R500,
in 1044erg/s (2)
53- 56 F4.2 10+14Msun M500 [0.55/1.65] Cluster mass derived from
X-ray data within the radius R500 (2)
58- 62 F5.3 Mpc R500 [0.35/0.52] Radius within which the mean
overdensity of the cluster is 500 times
the critical density at the cluster
redshift
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Note (1): The uncertainties on the redshifts are 0.001.
Note (2): The Lynx X-ray data are from Ettori+ (2004A&A...417...13E 2004A&A...417...13E and
2009A&A...501...61E 2009A&A...501...61E), Stott+ (2010ApJ...718...23S 2010ApJ...718...23S ; Lynx E only), and
Pascut & Ponman (2015MNRAS.447.3723P 2015MNRAS.447.3723P). See Section 3.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [104/5037] Galaxy ID number
6- 9 I4 --- [JCT2014] [240/9001]? Galaxy ID number
from Jorgensen+ (2014, J/AJ/148/117J)
11- 19 F9.5 deg RAdeg [132.08/132.31] Right Ascension (J2000)
21- 28 F8.5 deg DEdeg [44.84/44.94] Declimation (J2000)
30- 34 F5.2 mag z'mag [21.17/25.92] SExtractor magnitude
mag_auto in HST/ACS F850LP (1)
36- 41 F6.3 mag i'-z' [-0.06/1.2]? Aperture color index
F775W-F850LP (1)
43- 47 F5.2 mag z'dev [20.72/25.47]? Total magnitude
from r1/4 fit in F850LP (1)
49- 54 F6.3 [arcsec] logRe-dev [-1.13/0.54]? Log of the effective radius
from r1/4 fit in F850LP
56- 60 F5.2 mag z'ser [21/26]? Total magnitude
from Sersic fit in F850LP (1)
62- 67 F6.3 [arcsec] logRe-ser [-1.12/0.021]? Log of the effective
radius from Sersic fit in F850LP
69- 71 F3.1 --- nser [0.3/7]? Sersic index
from Sersic fit in F850LP
73- 77 F5.1 deg PA [-88.4/89.2]? Position angle of major
axis from Sersic fit in F850LP,
North-through-East
79- 82 F4.2 --- ell [0.05/0.84]? Ellipticity
from Sersic fit in F850LP
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Note (1): Magnitudes and colors have been corrected for galactic extinction.
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [2076/5037] Galaxy ID number
6- 11 F6.4 --- z [0.6777/1.587]? Redshift
13- 13 I1 --- Mm [0/3]? Membership flag (1)
15- 19 F5.3 [km/s] lsigma [1.9/2.6]? Log velocity dispersion
(logσ)
21- 25 F5.3 [km/s] lsigmac [1.9/2.6]? Aperture corrected log velocity
dispersion (logσcor) (2)
27- 31 F5.3 [km/s] e_lsigma [0.028/0.23]? Uncertainty in lsigma
33- 36 F4.2 --- fB8V [0/1]? Template fraction for B8V star
38- 41 F4.2 --- fG1V [0/0.84]? Template fraction for G1V star
43- 46 F4.2 --- fK0III [0/0.5]? Template fraction for K0III star
48- 51 F4.1 --- chi2 [1.4/10.7]? Chi-square for kinematics fit
53- 56 F4.1 --- S/N [1.6/78] Signal-to-noise per Angstrom in
the rest frame of the galaxy (3)
58- 62 F5.3 mag CN3883 [0.06/0.4]? The CN3883 line index (4)
64- 68 F5.3 mag e_CN3883 [0.003/0.03]? Uncertainty in CN3883 (5)
70- 74 F5.2 0.1nm CaHK [5.2/24.6]? The CaHK line index (4)
76- 79 F4.2 0.1nm e_CaHK [0.2/1.4]? Uncertainty in CaHK (5)
81- 85 F5.3 --- D4000 [1.2/2.2]? The D4000 line index (4)
87- 91 F5.3 --- e_D4000 [0.002/0.014]? Uncertainty in D4000 (5)
93- 96 F4.2 0.1nm HzetaA [1.5/6.5]? The HζA line index (4)
98-101 F4.2 0.1nm e_HzetaA [0.08/0.5]? Uncertainty in HzetaA (5)
103-107 F5.1 0.1nm EWOII [2.9/163]? Equivalent width of the [OII]
emission if present
109-112 F4.1 0.1nm e_EWOII [0.2/78]? Uncertainty on EWOII
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Note (1): Membership flag as follows:
0 = not member of Lynx E+W,
1 = member of Lynx E+W,
3 = redshift cannot be measured
Note (2): Corrected to a standard size aperture equivalent to a circular
aperture with a diameter of 3.4" at the distance of the Coma cluster.
Note (3): The wavelength interval for the S/N determination was chosen based on
the redshift of the galaxy as:
redshift 1.00-1.35: 3750-4100Å and
redshift <1: 4100-4600Å.
For ID 4722 and 4906 a redshift of 1.27 was assumed.
Note (4): The indices have been corrected for galaxy velocity dispersion and
aperture corrected.
Note (5): Determined from the local S/N.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jan-2021