J/MNRAS/467/1965 KMOS Redshift One Spectroscopic Survey (Harrison+, 2017)
The KMOS Redshift One Spectroscopic Survey (KROSS):
rotational velocities and angular momentum of z ~= 0.9 galaxies.
Harrison C.M., Johnson H.L., Swinbank A.M., Stott J.P., Bower R.G.,
Smail I., Tiley A.L., Bunker A.J., Cirasuolo M., Sobral D., Sharples R.M.,
Best P., Bureau M., Jarvis M.J., Magdis G.
<Mon. Not. R. Astron. Soc., 467, 1965-1983 (2017)>
=2017MNRAS.467.1965H 2017MNRAS.467.1965H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Redshifts
Keywords: galaxies: evolution - galaxies: kinematics and dynamics
Abstract:
We present dynamical measurements for 586 Hα-detected
star-forming galaxies from the KMOS (K-band Multi-Object Spectrograph)
Redshift One Spectroscopic Survey (KROSS). The sample represents
typical star-forming galaxies at this redshift (z=0.6-1.0), with a
median star formation rate of ~=7M☉/yr and a stellar mass range
of log(M*[M☉_])∼9-11. We find that the rotation
velocity-stellar mass relationship (the inverse of the Tully-Fisher
relationship) for our rotationally dominated sources
(vC/σ0>1) has a consistent slope and normalization as that
observed for z=0 discs. In contrast, the specific angular momentum
(j*; angular momentum divided by stellar mass) is ~=0.2-0.3dex lower
on average compared to z=0 discs. The specific angular momentum scales
as js∝M*0.6±0.2, consistent with that expected for dark
matter (i.e. jDM∝ MDM2/3). We find that z~=0.9
star-forming galaxies have decreasing specific angular momentum with
increasing Sersic index. Visually, the sources with the highest
specific angular momentum, for a given mass, have the most
disc-dominated morphologies. This implies that an angular
momentum-mass-morphology relationship, similar to that observed in
local massive galaxies, is already in place by z~=1.
Description:
KROSS is an IFS survey of 795 z=0.6-1.0 typical star-forming galaxies
designed to spatially resolve the Hα emission-line kinematics.
The targets were selected from four extragalactic deep fields that are
covered by a wide range of archival multi-wavelength photometric and
spectroscopic data.
We present new measurements and results based on IFU data of ∼600
Hα-detected z=0.6-1.0 star-forming galaxies that were observed
as part of KROSS (Stott et al. 2016MNRAS.457.1888S 2016MNRAS.457.1888S). These sources are
representative of log(M*[M☉])~=9-11 star-forming galaxies at
this redshift. Using a combination of broad-band imaging and our IFU
data we have made measurements of inclination angles, half-light
radii, morphological and kinematic position angles, rotational
velocities, intrinsic velocity dispersions and specific angular
momentum.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
krossv2.dat 468 586 KROSS V2 catalog
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See also:
J/ApJS/203/24 : Structural parameters of CANDELS galaxies (van der Wel+, 2012)
http://astro.dur.ac.uk/KROSS : KROSS Home Page
Byte-by-byte Description of file: krossv2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- KID KROSS ID (KID)
5- 26 A22 --- Name Object name (NAME)
28- 37 F10.6 deg RAdeg Right ascension (J2000) (RA)
39- 48 F10.6 deg DEdeg Declination (J2000) (DEC)
50- 57 F8.4 mag Kmag K-band magnitude (K_AB)
59- 66 F8.4 mag rmag r-band magnitude (R_AB)
68- 75 F8.4 mag zmag z-band magnitude (Z_AB)
77- 82 F6.2 mag HMAG Absolute H-band magnitude (MH)
84-105 E22.15 Msun Mass Stellar mass, scaled from HMAG with a fixed
mass-to-light ratio (MASS)
107-114 F8.6 --- VDW12n Sersic index n from van der Wel et al.
(2012, Cat. J/ApJS/203/24) (VDW12_N)
116-117 A2 --- im-Type [HIKz' ] Band of broad-band image used in
the analyses (IM_TYPE)
119 I1 --- Qual [1/4] Quality flag for the data
(QUALITY_FLAG) (1)
121-130 F10.6 deg PAim Positional angle of the broad-band image
(PA_IM)
132-140 F9.6 kpc Rim Deconvolved continuum half-light radii,
R1/2, from the image (R_IM)
142-149 F8.6 kpc e_Rim rms uncertainty on Rim (RIMERR)
151-153 F3.1 --- f_Rim [0/1] Note on Rim (R_FLAG) (2)
155-162 F8.6 --- b/a The observed axis ratio b/a from the
broad-band image (BOA)
164-171 F8.5 deg thetaim The inferred inclination angle, θim,
with error. If thetaim<25 then excluded
from the analyses(THETA_IM)
173-180 F8.5 deg e_thetaim rms uncertainty on thetaim (THETAIMERR)
182 I1 --- f_thetaim [0/1] If =1 then the inclination angle was
fixed to 53±18° (THETA_FLAG)
184-191 F8.6 --- z Redshift from Hα (Z)
193-214 E22.15 mW/m2 FHa Observed aperture Hα flux (F_HA)
216-237 E22.15 10-7W LHa Observed Hα luminosity with a factor
of x1.5 aperture correction applied(L_HA)
239-247 F9.6 Msun/yr SFR Inferred star formation rate from Hα
luminosity and applying an Av correction
(SFR)
249-256 F8.4 km/s sigmaTot Velocity dispersion from the
galaxy-integrated (aperture) spectrum
(SIGMA_TOT)
258 I1 --- fAGN [0/1] If =1 AGN emission affecting the
emission-line properties and are excluded
from the final analyses (AGN_FLAG)
260 I1 --- fIRR [0/1] if =1 unphysical measurements for the
rotational velocities and/or the
half-light radii (IRR_FLAG)
262-271 F10.6 deg PAvel Position angle of the major kinematic axis
(VEL_PA)
273-281 F9.5 km/s V2.2obs Observed velocity measured at 1.3 R1/2
(i.e. ~=2.2 RD), v2.2 (V22_OBS)
283-292 F10.5 km/s V2.2 Intrinsic v2.2 after inclination and
beam-smearing corrections (V22)
294-302 F9.5 km/s VCobs Observed velocity measured at 2 R1/2
(i.e. ~=3.4 RD)(VC_OBS)
304-313 F10.5 km/s VC Intrinsic vC after inclination and
beam-smearing corrections (VC)
315-324 F10.5 km/s e_VC Error on VC (lower value) (VCERRL)
326-335 F10.5 km/s E_VC Error on VC (upper value) (VCERRH)
337 I1 --- fEXTRAP [0/2] If =1, vC extrapolated >2 pixels
beyond the extent of the data,
if =2 then vC was estimated by scaling
sigmaTot (EXTRAP_FLAG)
339-341 A3 --- KinType Kinematic classification (KIN_TYPE) (3)
343 A1 --- l_JS [-] limit flag on JS
344-350 F7.2 km/s.kpc JS Specific angular momentum, js (JS)
352-358 F7.2 km/s.kpc e_JS Error on JS (lower value) (JSERRLOW)
360-367 F8.2 km/s.kpc E_JS Error on JS (lower value) (JSERRHIGH)
369-375 F7.2 km/s.kpc JN Specific angular momentum, jn,
using individual n values (JN)
377-384 F8.3 --- sigma0Obs Observed corrected velocity dispersion
(SIGMA0_OBS)
386-393 F8.3 --- e_sigma0Obs ?=-999 rms uncertainty on sigma0Obs
(SIGMA0OBSERR)
395-402 F8.3 --- sigma0 Beam smaearing corrected velocity
dispersion (SIGMA0)
404-411 F8.3 --- e_sigma0 ?=-999 rms uncertainty on sigma0
(SIGMA0_ERR)
413 A1 --- f_sigma0 [MOX] Flag on sigma0 (SIGMA0_FLAG) (4)
415-424 F10.5 --- RD/RPSF Ratio between the disk radius (in arcsec)
and half of the seeing FWHM (RD_RPSF)
426-435 F10.5 --- e_RD/RPSF ?=-999 rms uncertainty on RD/RPSF
(RDRPSFERR)
437-446 F10.5 --- Qg Global Toomre parameter (Q_g)
448-457 F10.5 --- E_Qg ?=-999 Error on Qg (upper value)
(QgERR_HIGH)
459-468 F10.5 --- e_Qg ?=-999 Error on Qg (lower value)
(QgERR_LOW)
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Note (1): Quality flag as follows:
1 = Hα-detected, spatially resolved and both thetaim and R1/2 were
measured from the broad-band
2 = Hα-detected and spatially resolved but thetaim was fixed
(see THETA_FLAG) and/or R1/2 was estimated from the kinematic
(see R_FLAG)
3 = Hα detected and resolved in the IFU data but only an upper limit
on R1/2
4 = Hα detected but unresolved in the IFU data
Note (2): If =1 then R1/2 is an upper limit, if =0.5 then R1/2 was estimated
using a fit to the kinematic data.
Note (3): Kinematic classification as follows:
RT+ = 'gold' rotationally dominated
RT = rotationally dominated
DN = dispersion dominated
X = IFU data are spatially unresolved
Note (4): Flag on sigma0 as follows:
M = dispersion measured from the median of all available pixels
O = dispersion measured in the outskirts of the disk
X = not explained in the paper
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History:
Copied at http://astro.dur.ac.uk/KROSS
(End) Patricia Vannier [CDS] 18-Nov-2019