J/ApJ/923/222 GCLASS HST grism data of z∼1 clusters (Matharu+, 2021)
HST/WFC3 grism observations of z∼1 clusters: evidence for rapid outside-in
environmental quenching from spatially resolved Hα maps.
Matharu J., Muzzin A., Brammer G.B., Nelson E.J., Auger M.W., Hewett P.C.,
van der Burg R., Balogh M., Demarco R., Marchesini D., Noble A.G.,
Rudnick G., van der Wel A., Wilson G., Yee H.K.C.
<Astrophys. J., 923, 222 (2021)>
=2021ApJ...923..222M 2021ApJ...923..222M
ADC_Keywords: Clusters, galaxy; Spectra, infrared; Optical; Surveys; Redshifts
Keywords: High-redshift galaxy clusters ; Galaxy evolution ;
Galaxy environments ; Star formation ; Galaxy stellar content ;
Galaxy clusters ; Galaxy quenching ; Galaxy stellar disks ;
Post-starburst galaxies ; E+A galaxies
Abstract:
We present and publicly release (www.gclasshst.com) the first
spatially resolved Hα maps of star-forming cluster galaxies at
z∼1, made possible with the Wide Field Camera 3 (WFC3) G141 grism on
the Hubble Space Telescope (HST). Using a similar but updated method
to 3D-HST in the field environment, we stack the Hα maps in bins
of stellar mass, measure the half-light radius of the Hα
distribution, and compare it to the stellar continuum. The ratio of
the Hα to stellar continuum half-light radius,
R[Hα/C]=Reff,Hα/Reff,Cont, is smaller in the clusters
by (6±9)%, but statistically consistent within 1σ
uncertainties. A negligible difference in R[Hα/C] with
environment is surprising, given the higher quenched fractions in the
clusters relative to the field. We postulate that the combination of
high quenched fractions and no change in R[Hα/C] with
environment can be reconciled if environmental quenching proceeds
rapidly. We investigate this hypothesis by performing similar analysis
on the spectroscopically confirmed, recently quenched cluster
galaxies. 87% have Hα detections, with star formation rates
8±1 times lower than star-forming cluster galaxies of similar
stellar mass. Importantly, these galaxies have an R[Hα/C] that
is (81±8)% smaller than coeval star- forming field galaxies at fixed
stellar mass. This suggests the environmental quenching process
occurred outside-in. We conclude that disk truncation due to ram
pressure stripping is occurring in cluster galaxies at z∼1, but more
rapidly and/or efficiently than in z≲0.5 clusters, such that the
effects on R[Hα/C] become observable just after the cluster
galaxy has recently quenched.
Description:
The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS, see
Muzzin+ 2012ApJ...746..188M 2012ApJ...746..188M & van der Burg+ 2013A&A...557A..15V 2013A&A...557A..15V) was
the spectroscopic follow-up of 10 massive clusters in the redshift
range 0.86<z<1.34, drawn from the 42deg2 Spitzer Adaptation of the
Red-sequence Cluster Survey (SpARCS). Extensive optical spectroscopy
was obtained with the Gemini Multi-Object Spectrographs (GMOS) on both
Gemini-South and -North. A spectroscopic redshift was obtained for
1282 galaxies in total, with 457 of these being confirmed as cluster
members. There is also 12-band photometry available for these clusters.
Newly acquired photometry in the F140W band (wide JH gap) has been
obtained as part of the GCLASS HST follow-up (Cycle 22; GO-13845,
PI: Muzzin; see Section 2.3). The public release of all GCLASS data
products is now available, and detailed in
Balogh+ (2021, J/MNRAS/500/358).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 102 10 The 10 GCLASS clusters used in this study
galaxies.dat 79 10449 List of galaxies; table added by CDS
sp/* . 10449 Individual 1D grism spectra in FITS format
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See also:
J/AJ/131/716 : Ha scale length in Virgo and field spirals (Koopmann+, 2006)
J/ApJ/655/51 : HDFS IRAC observations of 2<z<3.5 galaxies (Wuyts+, 2007)
J/ApJ/706/1364 : SINS survey of high-z galaxies (Forster Schreiber+, 2009)
J/ApJ/701/1965 : Radial dust properties of SINGS gal. (Munoz-Mateos+, 2009)
J/MNRAS/417/1996 : Gas properties in emission-line galaxies (Jaffe+, 2011)
J/A+A/544/A101 : GALEX obs. of Herschel Reference Survey (Cortese+, 2012)
J/ApJS/203/24 : Structural param. of galaxies in CANDELS (van der Wel+, 2012)
J/MNRAS/451/2303 : CF-HiZELS survey (Sobral+, 2015)
J/ApJS/225/27 : 3D-HST Survey: grism spectra master catalog (Momcheva+, 2016)
J/ApJ/833/178 : GLASS. VII. Hα maps (Vulcani+, 2016)
J/ApJ/886/124 : Completed KMOS3D survey NIR obs. (Wisnioski+, 2019)
J/ApJ/892/1 : Sizes of galaxies from the KMOS3D survey (Wilman+, 2020)
J/A+A/646/A139 : IC 3476 Halpha image (Boselli+, 2021)
J/MNRAS/500/358 : GOGREEN and GCLASS surveys: DR1 (Balogh+, 2021)
http://www.gclasshst.com/ : GCLASS HST grism data home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- Name Cluster name from Muzzin+ (2012ApJ...746..188M 2012ApJ...746..188M);
column added by CDS
23- 33 A11 --- AName Abbreviated name used in this work
35- 39 F5.3 --- zsp [0.86/1.34] Spectroscopic redshift from
Muzzin+ (2012ApJ...746..188M 2012ApJ...746..188M)
41- 44 F4.1 --- M200 [1.2/13] Mass enclosed within R200
46- 48 F3.1 --- e_M200 [0.5/3] M200 uncertainty
50- 53 I4 --- R200 [705/1663] Radius at which the mean interior
density is 200 times the critical density
of the universe
55- 57 I3 --- e_R200 [102/154] R200 uncertainty
59- 62 I4 --- SigV [530/1232] Line-of-sight velocity dispersion
64- 66 I3 --- e_SigV [65/137] Lower uncertainty on SigV
68- 70 I3 --- E_SigV [73/159] Upper uncertainty on SigV
72- 76 A5 --- zspMm Total spec-z members before/after quality
checks (1)
78- 82 A5 --- zMm Total grism-z members before/after quality
checks (1)
84- 89 A6 --- TotMm Total members before/after quality checks (1)
91-102 A12 --- Cl Abbreviated cluster name as used in GLASS-HST
file names; column added by CDS
--------------------------------------------------------------------------------
Note (1): The numbers listed in the last three columns indicate total numbers
before/after quality checks relevant to Matharu+ (2019MNRAS.484..595M 2019MNRAS.484..595M)
were applied. Mass completeness limits (see Section 4.1.3) are not
applied to these sample numbers.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: galaxies.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 F19.15 deg RAdeg [8.6/249.8] Right ascension (J2000)
21- 39 F19.15 deg DEdeg [-44.21/58.4] Declination (J2000)
41- 52 A12 --- Cl Abbreviated cluster name
54- 79 A26 --- FileName Name of the FITS file in subdirectory "sp"
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History:
From electronic version of the journal for Table 1.
Spectra downloaded at: http://www.gclasshst.com/1d-grism-spectra
(End) Emmanuelle Perret [CDS] 31-May-2023