J/MNRAS/496/649 K-CLASH: star-forming galaxies at z∼0.2-0.6 (Tiley+, 2020)
K-CLASH: spatially resolving star-forming galaxies in field and cluster
environments at z∼0.2-0.6.
Tiley A.L., Vaughan S.P., Stott J.P., Davies R.L., Prichard L.J.,
Bunker A., Bureau M., Cappellari M., Jarvis M., Robotham A., Cortese L.,
Bellstedt S., Ansarinejad B.
<Mon. Not. R. Astron. Soc., 496, 649-675 (2020)>
=2020MNRAS.496..649T 2020MNRAS.496..649T (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Positional data ; Redshifts ; Star Forming Region ;
Optical
Keywords: galaxies: evolution - galaxies: general -
galaxies: kinematics and dynamics - galaxies: star formation
Abstract:
We present the KMOS-CLASH (K-CLASH) survey, a K-band Multi-Object
Spectrograph (KMOS) survey, of the spatially resolved gas properties
and kinematics of 191 (pre-dominantly blue) Hα-detected galaxies
at 0.2~<z~<0.6 in field and cluster environments. K-CLASH targets
galaxies in four Cluster Lensing And Supernova survey with Hubble
(CLASH) fields in the KMOS IZ-band, over 7arcmin radius (∼2-3Mpc)
fields of view. K-CLASH aims to study the transition of star-forming
galaxies from turbulent, highly star-forming disc-like and peculiar
systems at z∼1-3, to the comparatively quiescent, ordered late-type
galaxies at z∼0, and to examine the role of clusters in the build-up
of the red sequence since z∼1. In this paper, we describe the K-CLASH
survey, present the sample, and provide an overview of the K-CLASH
galaxy properties. We demonstrate that our sample comprises
star-forming galaxies typical of their stellar masses and epochs,
residing both in field and cluster environments. We conclude K-CLASH
provides an ideal sample to bridge the gap between existing large
integral-field spectroscopy surveys at higher and lower redshifts. We
find that star-forming K-CLASH cluster galaxies at intermediate
redshifts have systematically lower stellar masses than their
star-forming counterparts in the field, hinting at possible
'downsizing' scenarios of galaxy growth in clusters at these epochs.
We measure no difference between the star formation rates of
Hα-detected, star-forming galaxies in either environment after
accounting for stellar mass, suggesting that cluster quenching occurs
very rapidly during the epochs probed by K-CLASH, or that star-forming
K-CLASH galaxies in clusters have only recently arrived there, with
insufficient time elapsed for quenching to have occurred.
Description:
The K-CLASH survey is a University of Oxford guaranteed time survey
with the European Southern Observatory (ESO) KMOS on the VLT, Chile.
Using 8.5 nights of KMOS time, we targeted the Hα and [NII] line
emission from 282 galaxies in four CLASH cluster fields. We carried
out KMOS observations in the IZ band to detect Hα emission from
star-forming field galaxies along cluster sightlines in the redshift
range of 0.2~<z~<0.6. Similarly, we selected cluster fields to observe
with KMOS such that the cluster redshift was in the range of
0.3~<z~<0.6. In this way, in the same observations, we were able to
simultaneously construct both field and cluster samples of
star-forming galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 223 282 Key properties of the K-CLASH sample galaxies
discussed in this work
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID K-CLASH galaxy identifier (NNNN_NNNNN)
12- 23 F12.8 deg RAdeg Right ascension (J2000)
25- 35 F11.7 deg DEdeg Declination (J2000)
37- 55 F19.17 --- z Redshift (1)
57 I1 --- Halpha [0/1] Indicates if the galaxy is detected
in Hα
59 I1 --- Cluster [0/1] Cluster sub-sample membership flag
(2)
61 I1 --- Field [0/1] Field sub-sample membership flag (2)
63 I1 --- AGN [0/1] Candidate AGN host flag
65- 84 F20.17 kpc R50 Stellar half-light radius
86- 105 F20.17 [Msun] logM* Logarithm of the ProSpect-derived stellar
mass
107- 128 F22.17 [Msun/yr] logSFRp Logarithm of the ProSpect-derived total
star formation rate
130- 151 F22.17 [Msun/yr] logSFRHa ?=-999 Logarithm of the Hα-derived
total star formation rate
153- 223 A71 --- OName Alternative name (3)
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Note (1): The redshift is spectroscopic if detected in Hα and photometric
otherwise (calculated using the Bayesian photometric analysis and
spectral energy distribution (SED) fitting package, BPZ (Benitez
2000ApJ...536..571B 2000ApJ...536..571B))
Note (2): We note that candidate AGN hosts and Hα non-detections are
excluded from the cluster and field sub-samples
Note (3): Object name(s) of any corresponding entry (within a 1arcsec radius of
the K-CLASH galaxy position) in the NASA/IPAC Extragalactic Database
(NED) and/or the Set of Identifications, Measurements, and
Bibliography for Astronomical Data (SIMBAD) data base
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 27-Jun-2023