J/MNRAS/486/175 HiZELS star-forming galaxies at z=0.8-3.3 (Gillman+, 2019)
The dynamics and distribution of angular momentum in HiZELS star-forming
galaxies at z=0.8-3.3.
Gillman S., Swinbank A.M., Tiley A.L., Harrison C.M., Smail I.,
Dudzeviciute U., Sharples R.M., Best P.N., Bower R.G., Cochrane R.,
Fisher D., Geach J.E., Glazebrook K., Ibar E., Molina J., Obreschkow D.,
Schaller M., Sobral D., Sweet S., Trayford J.W., Theuns T.
<Mon. Not. R. Astron. Soc., 486, 175-194 (2019)>
=2019MNRAS.486..175G 2019MNRAS.486..175G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Redshifts ; Rotational velocities ;
Morphology ; Photometry, infrared
Keywords: galaxies: evolution - galaxies: high redshift -
galaxies: kinematics and dynamics
Abstract:
We present adaptive optics assisted integral field spectroscopy of 34
star-forming galaxies at z=0.8-3.3 selected from the HiZELS
narrow-band survey. We measure the kinematics of the ionized
interstellar medium on ∼1kpc scales, and show that the galaxies are
turbulent, with a median ratio of rotational to dispersion support of
V/σ=0.82±0.13. We combine the dynamics with high-resolution
rest-frame optical imaging and extract emission-line rotation curves.
We show that high-redshift star-forming galaxies follow a similar
power-law trend in specific angular momentum with stellar mass to that
of local late-type galaxies. We exploit the high resolution of our
data and examine the radial distribution of angular momentum within
each galaxy by constructing total angular momentum profiles. Although
the stellar mass of a typical star-forming galaxy is expected to grow
by a factor ∼8 in the ∼5Gyr between z∼3.3 and z∼0.8, we show that the
internal distribution of angular momentum becomes less centrally
concentrated in this period; that is, the angular momentum grows
outwards. To interpret our observations, we exploit the EAGLE
simulation and trace the angular momentum evolution of star-forming
galaxies from z∼3 to z∼0, identifying a similar trend of decreasing
angular momentum concentration. This change is attributed to a
combination of gas accretion in the outer disc, and feedback that
preferentially arises from the central regions of the galaxy. We
discuss how the combination of the growing bulge and angular momentum
stabilizes the disc and gives rise to the Hubble sequence.
Description:
The majority of the observations (31 targets; 90 per cent of the
sample) were obtained from follow-up spectroscopic observations of the
High Redshift Emission Line Survey (HiZELS; Geach et al.
2008MNRAS.388.1473G 2008MNRAS.388.1473G; Best et al. 2013ASSP...37..235B 2013ASSP...37..235B), which targets
Hα-emitting galaxies in five narrow (Δz=0.03) redshift
slices: z=0.40, 0.84, 1.47, 2.23, and 3.33 (Sobral et al.
2013MNRAS.428.1128S 2013MNRAS.428.1128S, Cat. J/MNRAS/428/1128). This panoramic survey
provides a luminosity-limited sample of Hα and [OIII] emitters
spanning z=0.4-3.3. The other 3 galaxies were taken from the KMOS
Galaxy Evolution Survey (KGES; Tiley et al. 2021MNRAS.506..323T 2021MNRAS.506..323T), a
sample of ∼300 star-forming galaxies at z∼1.5.
Exploiting the wide survey area, the targets from the HiZELS survey
were selected to lie within 25.0arcsec of a natural guide star to
allow for adaptive optics capabilities. The sample spans the full
range of the rest-frame (U-V) and rest-frame (V-J) colour space as
well as the stellar mass and star formation rate plane of the HiZELS
parent sample (Table A1). The data were collected from 2012 August to
2017 December from a series of observing runs on the SINFONI (VLT),
NIFS (Gemini North Observatory), and OSIRIS (Keck) integral field
spectrographs (see Table B1 for details). Finally, a summary of the
morphological properties for our sample is shown in Table C1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 73 34 Integrated galaxy properties
tableb1.dat 76 34 Integrated field observations
tablec1.dat 78 34 Morpho-kinematic properties
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Galaxy name (SHIZELS-NN)
12 I1 --- r_OName ? References for OName (1)
14- 23 A10 --- OName Previously published name
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 36 F6.3 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 48 F4.1 arcsec DEs Declination (J2000)
50- 54 F5.3 --- z Spectroscopic redshift (2)
56- 61 F6.2 mag Hmag ? H-band AB magnitude (3)
63- 66 F4.1 [Msun] logMass Logarithm of galaxy stellar mass (3)
68- 70 I3 [Msun/yr] SFR Star formation rate (3)
72- 73 I2 [Msun/yr] e_SFR Error on SFR
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Note (1): References as follows:
1 = Molina et al. 2017MNRAS.466..892M 2017MNRAS.466..892M
2 = Swinbank et al. 2012MNRAS.426..935S 2012MNRAS.426..935S
Note (2): Spectroscopic redshift derived from the near infra-red integral field
spectrum. Galaxies at z=<2.5 are detected in Hα, whilst those
at z≥3 have their kinematics traced by the [OIII] emission line
Sobral et al. (2013MNRAS.428.1128S 2013MNRAS.428.1128S, Cat. J/MNRAS/428/1128,
2015MNRAS.451.2303S 2015MNRAS.451.2303S, Cat. J/MNRAS/451/2303);
Khostovan et al. (2015MNRAS.452.3948K 2015MNRAS.452.3948K)
Note (3): Stellar properties derived using MagPhys da Cunha et al.
(2008MNRAS.388.1595D 2008MNRAS.388.1595D) using a Chabrier (2003PASP..115..763C 2003PASP..115..763C) IMF, the
Calzetti et al. (2000ApJ...533..682C 2000ApJ...533..682C) reddening law and either
constant or exponentially declining SFRs.
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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 --- Name Galaxy name (SHIZELS-NN)
12- 16 F5.3 --- z Spectroscopic Hα or [OIII] redshift
derived from spectrum
18- 23 A6 --- EGF Extra-galactic Field
25 A1 --- Band [JHK] Wavelength band used for spectroscopic
observation
27- 42 A16 --- IFU Integral Field Spectrograph used for
spectroscopic observation
44 A1 --- f_IFU [*] Flag on IFU (1)
46- 49 F4.1 ks texp Total on source integration time of integral
field observations
51- 54 F4.2 kpc PSF Integral field PSF size as measured from
standard star observations
56- 76 A21 --- Broadband Ancillary photometric data available for each
target
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Note (1): Flag as follows:
* = Laser Guide Star (LGS), otherwise Natural Guide Star (NGS)
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Galaxy name (SHIZELS-NN)
12- 14 F3.1 kpc Rh Half-light radius
16- 18 F3.1 kpc e_Rh Error on Rh
20- 22 F3.1 --- n Sersic index
24- 26 F3.1 --- e_n Error on n
28- 30 F3.1 --- b/a Semiminor to semimajor axis ratio
32- 34 F3.1 --- e_b/a Error on b/a
36- 37 I2 deg thetai Inclination (1)
39- 40 I2 deg e_thetai Error on thetai
42- 44 I3 deg PAvel Kinematic position angle
46- 47 I2 deg e_PAvel Error on PAvel
49- 51 I3 km/s Vrot Beam-smearing-corrected rotation velocity
at r=2Rh
53- 55 I3 km/s e_Vrot Error on Vrot
57- 61 F5.2 --- Vcirc/Vrot Circular velocity to rotational velocity
ratio at r=2Rh
63- 65 I3 km/s sig Velocity dispersion
67- 68 I2 km/s e_sig Error on sig
70- 72 F3.1 --- Vrot/sig Rotational velocity to velocity dispersion
ratio
74- 76 F3.1 --- e_Vrot/sig Error on Vrot/sig
78 I1 --- Quality Qualify flag based on kinematic criteria (2)
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Note (1): thetai=0 represents a face-on galaxy
Note (2): Quality flag as follows:
1 = Vrot/sig>1 and Ψ<30° (6/34)
2 = Vrot/sig>1 or Ψ<30° (17/34)
3 = Vrot/sig<1 and Ψ>30° (11/34)
Where sinΨ=|sin(PAim-PAvel)|, PAim is the morphological position
angle and PAvel is the kinematic position angle
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 13-Oct-2022