J/ApJ/779/137 HST NIR spectroscopy of ISCS z>1 galaxy clusters (Zeimann+, 2013)
Hα star formation rates of z > 1 galaxy clusters in the IRAC Shallow
Cluster Survey.
Zeimann G.R., Stanford S.A., Brodwin M., Gonzalez A.H., Mancone C.,
Snyder G.F., Stern D., Eisenhardt P., Dey A., Moustakas J.
<Astrophys. J., 779, 137 (2013)>
=2013ApJ...779..137Z 2013ApJ...779..137Z (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Spectra, infrared ; Redshifts ;
Equivalent widths ; Active gal. nuclei
Keywords: galaxies: clusters: general; galaxies: evolution
galaxies: high-redshift
Abstract:
We present Hubble Space Telescope near-IR spectroscopy for 18 galaxy
clusters at 1.0<z<1.5 in the IRAC Shallow Cluster Survey (ISCS). We
use Wide Field Camera 3 grism data to spectroscopically identify
Hα emitters in both the cores of galaxy clusters as well as in
field galaxies. We find a large cluster-to-cluster scatter in the star
formation rates within a projected radius of 500kpc, and many of our
clusters (∼60%) have significant levels of star formation within a
projected radius of 200kpc. A stacking analysis reveals that dust
reddening in these star-forming galaxies is positively correlated with
stellar mass and may be higher in the field than the cluster at a
fixed stellar mass. This may indicate a lower amount of gas in
star-forming cluster galaxies than in the field population. Also,
Hα equivalent widths of star-forming galaxies in the cluster
environment are still suppressed below the level of the field. This
suppression is most significant for lower mass galaxies
(logM*<10.0M☉). We therefore conclude that environmental
effects are still important at 1.0<z<1.5 for star-forming galaxies in
galaxy clusters with logM*≲10.0M☉.
Description:
The stellar-mass-selected IRAC Shallow Cluster Survey (ISCS;
Eisenhardt et al. 2008, J/ApJ/684/905) includes more than 20
spectroscopically confirmed clusters at z>1.
Both high-resolution NIR imaging and NIR slitless spectroscopy (GO
proposal ID 11597) were obtained for 18 z>1 clusters in the ISCS
sample by using the HST WFC3; in the range of 1.08-1.69um and a
resolution of 93Å.
A variety of other programs (GO proposal IDs 10496, 11002, 11663)
provided optical data for a subset of the clusters with the Advanced
Camera for Surveys (ACS) and Wide Field Planetary Camera 2 (WFPC2) in
filters F775W, F850LP, and F814W.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 18 IRAC Shallow Cluster Survey (ISCS) WFC3 grism
high-redshift cluster sample
table2.dat 97 462 WFC3 grism spectroscopic redshifts of galaxies
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See also:
J/MNRAS/411/2009 : H narrow-band imaging of XMMU J2235.3-2557 (Bauer+, 2011)
J/A+A/507/671 : Spectroscopy in cluster RDCS J1252.9-2927 (Tanaka+, 2009)
J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)
J/ApJ/684/905 : z>1 galaxy clusters from ISCS (Eisenhardt+, 2008)
J/ApJ/639/816 : The FLAMINGOS Extragalactic Survey (Elston+, 2006)
J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [ISCS]
6- 17 A12 --- ISCS Cluster identifier (JHHMM.m+DDMM)
19- 20 I2 h RAh [14] Hour of right ascension (J2000) (1)
22- 23 I2 min RAm [25/38] Minute of right ascension (J2000)
25- 29 F5.2 s RAs Second of right ascension (J2000)
31 A1 --- DE- [+] Sign of declination (J2000) (1)
32- 33 I2 deg DEd [32/35] Degree of declination (J2000) (1)
35- 36 I2 arcmin DEm Arcminute of declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of declination (J2000)
43- 47 F5.3 --- [1/1.5] Mean spectroscopic redshift
49- 53 F5.3 --- 2 [1.203]? Second value of
55 I1 --- NHa [0/9] Number of Hα emitting members
used in this analysis (2)
57- 58 I2 --- Nsp [4/26] Number of spectroscopic redshift
60 I1 --- Nsp2 [6]? Second value of Nsp
62- 70 A9 --- Ref Reference(s) (3)
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Note (1): For ISCS J1426.1+3403, the coordinates 14:26:29.51+34:03:41.1 (J2000)
are very likely a misprint for 14:26:09.51+34:03:41.1 (J2000) as given
in Eisenhardt et al. (2008, J/ApJ/684/905). Misprint corrected at CDS.
Note (2): Number of Hα emitting members used in this analysis, which
requires "good" stellar masses (see Section 4.3).
Note (3): Reference as follows:
E08 = Eisenhardt et al. (2008, J/ApJ/684/905)
E06 = Elston et al. (2006, J/ApJ/639/816)
B06 = Brodwin et al. (2006ApJ...651..791B 2006ApJ...651..791B)
S05 = Stanford et al. (2005ApJ...634L.129S 2005ApJ...634L.129S)
B11 = Brodwin et al. (2011ApJ...732...33B 2011ApJ...732...33B)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [ISCS]
6- 17 A12 --- ISCS Cluster identifier ("JHHMM.m+DDMM", or "Field")
19- 34 A16 --- Name Source identifier (JHHMMSS.s+DDMMSS)
36- 37 I2 h RAh [14] Hour of Right Ascension (J2000)
39- 40 I2 min RAm [25/38] Minute of Right Ascension (J2000)
42- 46 F5.2 s RAs Second of Right Ascension (J2000)
48 A1 --- DE- [+] Sign of Declination (J2000)
49- 50 I2 deg DEd [32/35] Degree of Declination (J2000)
52- 53 I2 arcmin DEm Arcminute of Declination (J2000)
55- 58 F4.1 arcsec DEs Arcsecond of Declination (J2000)
60- 64 F5.3 --- z [0.7/2.3] Spectroscopic redshift
66 A1 --- q_z [A-C] Quality flag on z, A=best (1)
68- 72 F5.1 10-20W/m2 Flux [1/292]? Integrated Hα+[N II] flux;
in 10-17erg/s/cm2
74- 77 F4.1 10-20W/m2 e_Flux [0.9/12]? Uncertainty in Flux
79- 82 I4 0.1nm EW [17/3020]? Hα+[N II] equivalent width;
in Angstroms
84- 88 I5 0.1nm e_EW [6/13381]? Uncertainty in EW
90- 93 F4.1 [Msun] logM* [8.8/11.5]? Log of stellar mass
95- 97 A3 --- AGN [AGN/ ] AGN flag
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Note (1): Quality as follows:
C = single feature;
B = two features consistent with the same redshift;
A = three or more features indicating a single redshift.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-May-2015