THE VLT LEGA-C SPECTROSCOPIC SURVEY: THE PHYSICS OF GALAXIES AT A LOOKBACK TIME OF 7 Gyr

Wel, Arjen van der; Noeske, K. G.; Bezanson, Rachel; Pacifici, Camilla; Gallazzi, Anna; Franx, Marijn; Muñoz-Mateos, J. C.; Bell, Eric F.; Brammer, Gabriel; Charlot, S.; Chauké, Priscilla; Labbé, Ivo; Maseda, Michael V.; Muzzin, Adam; Rix, Hans─Walter; Sobral, David; Sande, Jesse van de; Dokkum, Pieter van; Wild, Vivienne; Wolf, Christian

doi:10.3847/0067-0049/223/2/29

Cited by 162 publications

(114 citation statements)

References 110 publications

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“…Each galaxy is observed for ∼ 20 h, which results in spectra with S/N ∼ 20Å −1 (with resolution R ∼ 3000) in the wavelength range ∼ 0.6µm − 0.9µm. For details of the data reduction procedure, see van der Wel et al (2016) and Straatman et al (2018). This work is based on the second data release 1 , which contains 1550 primary sample galaxies.…”

Section: Datamentioning

confidence: 99%

Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

Chauké

Wel

Pacifici

et al. 2019

ApJ

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We use reconstructed star-formation histories (SFHs) of quiescent galaxies at z = 0.6 − 1 in the LEGA-C survey to identify secondary star-formation episodes that, after an initial period of quiescence, moved the galaxies back to the star-forming main sequence (blue cloud). 16 ± 3% of the z ∼ 0.8 quiescent population has experienced such rejuvenation events in the redshift range 0.7 < z < 1.5 after reaching quiescence at some earlier time. On average, these galaxies first became quiescent at z = 1.2, and those that rejuvenated, remained quiescent for ∼ 1Gyr before their secondary SF episode which lasted ∼ 0.7Gyr. The stellar mass attributed to rejuvenation is on average 10% of the galaxy stellar mass, with rare instances of an increase of more than a factor 2. Overall, rejuvenation events only contribute ∼ 2% of the total stellar mass in z ∼ 0.8 quiescent galaxies and we conclude that rejuvenation is not an important evolutionary channel when considering the growth of the red sequence. However, our results complicate the interpretation of galaxy demographics in color space: the galaxies with rejuvenation events tend to lie in the so-called 'green valley', yet their progenitors were quiescent at z ∼ 2.

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Section: Datamentioning

confidence: 99%

Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

Chauké

Wel

Pacifici

et al. 2019

ApJ

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“…The combination of photometric and spectroscopic data enables evolutionary studies of relations among the spectroscopic and structural properties of galaxies. The largest extragalactic field surveyed with the Hubble Space Telescope (HST), the ∼ 2deg 2 COSMOS field, has thus been the preferred target for a suite of intermediate-and high-redshift spectroscopic campaigns (e.g, zCOSMOS, Lilly et al 2007Lilly et al , 2009PRIMUS, Coil et al 2011;VUDS, Le Fèvre et al 2015;FMOS-COSMOS, Silverman et al 2015;LEGA-C;van der Wel et al 2016). At 0.1 < z < 0.6, broad spectroscopic wavelength coverage and a high level of completeness are critically important for accurately tracing the relations between photometric and spectroscopic properties of galaxies.…”

Section: Introductionmentioning

confidence: 99%

hCOSMOS: A Dense Spectroscopic Survey of r ≤ 21.3 Galaxies in the COSMOS field

Damjanov

Zahid

Geller

et al. 2018

ApJS

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We describe the hCOSMOS redshift survey of the COSMOS field conducted with the Hectospec spectrograph on the MMT. In the central 1 deg 2 , the hCOS20.6 subset of the survey is > 90% complete to a limiting r = 20.6. The hCOSMOS survey includes 1701 new redshifts in the COSMOS field. We also use the total of 4362 new and remeasured objects to derive the age sensitive D n 4000 index over the entire redshift interval 0.001 z 0.6. For 85% of the quiescent galaxies in hCOS20.6, we measure the central line-of-sight velocity dispersion. To explore potential uses of this survey, we combine previously measured galaxy sizes, profiles and stellar masses with the spectroscopy. The comparison reveals the known relations among structural, kinematic, and stellar population properties. We also compare redshift and D n 4000 distributions of hCOS20.6 galaxies with SHELS; a complete spectroscopic survey of 4 deg 2 observed to the same depth. The redshift distributions in the two fields are very different but the D n 4000 distribution is remarkably similar. The relation between velocity dispersion and stellar mass for massive hCOS20.6 galaxies is consistent with the local relation from SDSS. Using measured velocity dispersions, we test a photometric proxy calibrated to galaxies in the local universe. The systematic differences between the measured and photometric proxy velocity dispersions are correlated with galaxy dynamical and stellar population properties highlighting the importance of direct spectroscopic measurements.

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“…The LEGA-C survey (van der Wel et al 2016) is an ESO public spectroscopic survey with VLT/VIMOS (LeFevre et al 2003) with the aim of obtaining high signal-to-noise ratio (S/N ∼ 20 Å −1 ) continuum spectra of 0.6 < z < 1 galaxies. The full LEGA-C sample will consist of more than 3000 galaxies, K-band selected from the Muzzin et al (2013) UltraVISTA survey in the 1.62 square degree region within the COSMOS field (Scoville et al 2007).…”

Section: Lega-cmentioning

confidence: 99%

“…Stellar masses are derived by using an initial mass function (Chabrier 2003), dust extinction (Calzetti et al 2000), and stellar population libraries and exponentially declining SFR (Bruzual & Charlot 2003). For further details on the data reduction steps and the method used to derive the physical parameters, see van der Wel et al (2016).…”

Section: Lega-cmentioning

confidence: 99%

Stellar Dynamics and Star Formation Histories of z ∼ 1 Radio-loud Galaxies

Barišić

Wel

Bezanson

et al. 2017

ApJ

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We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities) at 0.6 < z < 1. This sample is constructed by cross-matching galaxies from the deep VLT/VIMOS LEGA-C spectroscopic survey with the VLA 3 GHz data set. The LEGA-C continuum spectra reveal for the first time stellar velocity dispersions and age indicators of z∼1 radio galaxies. We find that z∼1 radio-loud active galactic nucleus (AGN) occur exclusively in predominantly old galaxies with high velocity dispersions: σ * > 175 km s −1 , corresponding to black hole masses in excess of 10 8 M e . Furthermore, we confirm that at a fixed stellar mass the fraction of radio-loud AGN at z ∼ 1 is five to 10 times higher than in the local universe, suggesting that quiescent, massive galaxies at z ∼ 1 switch on as radio AGN on average once every Gyr. Our results strengthen the existing evidence for a link between high black hole masses, radio loudness, and quiescence at z ∼ 1.

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THE VLT LEGA-C SPECTROSCOPIC SURVEY: THE PHYSICS OF GALAXIES AT A LOOKBACK TIME OF 7 Gyr

Cited by 162 publications

References 110 publications

Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

Rejuvenation in z ∼ 0.8 Quiescent Galaxies in LEGA-C

hCOSMOS: A Dense Spectroscopic Survey of r ≤ 21.3 Galaxies in the COSMOS field

Stellar Dynamics and Star Formation Histories of z ∼ 1 Radio-loud Galaxies

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