SPECTRAL ENERGY DISTRIBUTION FITTING OF HETDEX PILOT SURVEY Lyα EMITTERS IN COSMOS AND GOODS-N

Hagen, Alex; Ciardullo, Robin; Grönwall, C.; Acquaviva, Viviana; Bridge, Joanna S.; Zeimann, Gregory R.; Blanc, Guillermo A.; Bond, Nicholas A.; Finkelstein, Steven L.; Song, Mimi; Gawiser, Eric; Fox, D. B.; Gebhardt, Henry S. Grasshorn; Malz, Alex I.; Schneider, Donald P.; Drory, Niv; Gebhardt, Karl; Hill, Gary J.

doi:10.1088/0004-637x/786/1/59

Cited by 57 publications

(109 citation statements)

References 91 publications

(136 reference statements)

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“…This outcome is true whether or not we focus on all galaxies with Lyα in emission or only strong Lyα emitters (LAEs). This is in contrast with results from NB or emission-line selected LAE studies (e.g., Gawiser et al 2006Gawiser et al , 2007Lai et al 2008;Guaita et al 2011;Hagen et al 2014). These studies find lower dust, lower stellar mass and higher SSFR for galaxies with strong Lyα in emission.…”

Section: Lyα Ew and Stellar Population Propertiescontrasting

confidence: 93%

“…The median L(Lyα) of the SFG L sample is ∼10 40 erg/s, while the median L(Lyα) of the LAE sample is ∼10 41 erg/s. The LAEs discovered in the VUDS survey are significantly less luminous than the Lyα emitters found by most NB/emission-line surveys (∼10 42 erg/s) at similar redshifts (e.g., Guaita et al 2010;Hagen et al 2014). The fraction of LAEs as a function of redshift is shown in the right panel of Fig.…”

Section: Sfgs With and Without Lyα Emissionmentioning

confidence: 83%

See 1 more Smart Citation

The VIMOS Ultra Deep Survey: Lyαemission and stellar populations of star-forming galaxies at 2 < z < 2.5

Fèvre

Ilbert

Cassata

et al. 2016

A&A

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The aim of this paper is to investigate spectral and photometric properties of 854 faint (i AB < ∼ 25 mag) star-forming galaxies (SFGs) at 2 < z < 2.5 using the VIMOS Ultra-Deep Survey (VUDS) spectroscopic data and deep multi-wavelength photometric data in three extensively studied extragalactic fields (ECDFS, VVDS, COSMOS). These SFGs were targeted for spectroscopy as a result of their photometric redshifts. The VUDS spectra are used to measure the UV spectral slopes (β) as well as Lyα equivalent widths (EW). On average, the spectroscopically measured β (-1.36 ± 0.02), is comparable to the photometrically measured β (-1.32 ± 0.02), and has smaller measurement uncertainties. The positive correlation of β with the spectral energy distribution (SED)-based measurement of dust extinction E s (B − V) emphasizes the importance of β as an alternative dust indicator at high redshifts. To make a proper comparison, we divide these SFGs into three subgroups based on their rest-frame Lyα EW: SFGs with no Lyα emission (SFG N ; EW ≤ 0 Å), SFGs with Lyα emission (SFG L ; EW > 0 Å), and Lyα emitters (LAEs; EW ≥ 20 Å). The fraction of LAEs at these redshifts is ∼10%, which is consistent with previous observations. We compared best-fit SED-estimated stellar parameters of the SFG N , SFG L and LAE samples. For the luminosities probed here (∼L * ), we find that galaxies with and without Lyα in emission have small but significant differences in their SED-based properties. We find that LAEs have less dust, and lower star-formation rates (SFR) compared to non-LAEs. We also find that LAEs are less massive compared to non-LAEs, though the difference is smaller and less significant compared to the SFR and E s (B − V). When we divide the LAEs according to their Spitzer/IRAC 3.6 μm fluxes, we find that the fraction of IRAC-detected (m 3.6 < ∼ 25 mag) LAEs is much higher than the fraction of IRAC-detected narrow band (NB)-selected LAEs at z 2-3. This could imply that UV-selected LAEs host a more evolved stellar population, which represents a later stage of galaxy evolution, compared to NB-selected LAEs.

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Section: Lyα Ew and Stellar Population Propertiescontrasting

confidence: 93%

Section: Sfgs With and Without Lyα Emissionmentioning

confidence: 83%

The VIMOS Ultra Deep Survey: Lyαemission and stellar populations of star-forming galaxies at 2 < z < 2.5

Fèvre

Ilbert

Cassata

et al. 2016

A&A

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“…10a we show data for high-z star-forming galaxies by Cullen et al (2014) and Steidel et al (2014) (inside the box), Lyα-emitting galaxies by Hagen et al (2014) (stars), star-forming galaxies by Troncoso et al (2014) (asterisks), star-forming galaxies with z ∼ 4 by Bouwens et al (2012) (thick red solid line), star-forming galaxies with z ∼ 5 -6 by Salmon et al (2015) (thick yellow solid line), and galaxy candidates with z ∼ 9 -11 by Coe et al (2013) and Oesch et al (2014) (large open darkgrey triangles). High-z galaxies, including the highest redshift galaxy candidates, nicely follow the trend for low-z galaxies with EW(Hβ) 100Å (magenta symbols), but are offset to higher L(Hβ) as compared to the rest of galaxies from our sample with presumably older starbursts (cyan symbols).…”

Section: Hβ Luminosity -Stellar Mass Relationmentioning

confidence: 99%

“…The location of star-forming galaxies with redshifts 2.0 < z < 2.6 by Steidel et al (2014) and with z > 2 by Cullen et al (2014) is shown by a grey rectangle. Lyα emitting galaxies with redshifts 1.9 < z < 3.6 by Hagen et al (2014) and star-forming galaxies with redshifts z ∼ 3.4 by Troncoso et al (2014) are shown by dark-grey stars and asterisks, respectively. The relations for galaxies with z ∼ 4 by Bouwens et al (2012) and for galaxies with z ∼ 5 -6 by Salmon et al (2015) are indicated by thick solid red and yellow lines, respectively.…”

Section: Hβ Luminosity -Stellar Mass Relationmentioning

confidence: 99%

On the universality of luminosity–metallicity and mass–metallicity relations for compact star-forming galaxies at redshifts 0 < z < 3

Izotov

Гусева

Fricke

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We study relations between global characteristics of low-redshift (0 < z < 1) compact star-forming galaxies, including absolute optical magnitudes, Hβ emission-line luminosities (or equivalently star-formation rates), stellar masses, and oxygen abundances. The sample consists of 5182 galaxies with high-excitation H ii regions selected from the SDSS DR7 and SDSS/BOSS DR10 surveys adopting a criterion [O iii]λ4959/Hβ 1. These data were combined with the corresponding data for high-redshift (2 z 3) star-forming galaxies. We find that in all diagrams low-z and high-z star-forming galaxies are closely related indicating a very weak dependence of metallicity on stellar mass, redshift, and star-formation rate. This finding argues in favour of the universal character of the global relations for compact star-forming galaxies with high-excitation H ii regions over redshifts 0 < z < 3.

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“…Because Lyα photons are easily absorbed by dust grains and are scattered by neutral hydrogen (HI), LAEs were thought to be a special population of galaxies with special dust and HI amounts and distribution. Although extensive studies have been carried out to characterize LAE physical properties and their special conditions (Nilsson et al 2011;Acquaviva et al 2012;McLinden et al 2014;Vargas et al 2014;Hagen et al 2014, among the most recent ones), the results have been inconclusive. The mechanisms (e.g., interstellar medium geometry and kinematics) controlling the escape of Lyα photon are still debated.…”

Section: Introductionmentioning

confidence: 99%

The Lyman alpha reference sample

Guaita

Melinder

Hayes

et al. 2015

A&A

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Context. The transport of Lyα photons in galaxies is a complex process and the conditions under which Lyα photons manage to escape from certain galaxies is still under investigation. The Lyman alpha reference sample (LARS) is a sample of 14 local starforming galaxies, designed to study Lyα in detail and relate it to rest-frame UV and optical emission. Aims. With the aim of identifying rest-frame UV and optical properties, which are typical of Lyα emitters (LAEs, galaxies with EW(Lyα) > 20 Å) at both low and high redshift, we investigated the morphological properties of the LARS galaxies, in particular the ones that exhibit intense Lyα radiation. Methods. We measured sizes and morphological parameters in the continuum, Lyα, and Hα images. We studied morphology by using the Gini coefficient vs. M20 and asymmetry vs. concentration diagrams. We then simulated LARS galaxies at z ∼ 2 and 5.7, performing the same morphological measurements. We also investigated the detectability of LARS galaxies in current deep field observations. The subsample of LAEs within LARS (LARS-LAEs) was stacked to provide a comparison to stacking studies performed at high redshift. Results. LARS galaxies have continuum size, stellar mass, and rest-frame absolute magnitude typical of Lyman break analogues in the local Universe and also similar to 2 < z < 3 star-forming galaxies and massive LAEs. LARS optical morphology is consistent with the one of merging systems, and irregular or starburst galaxies. For the first time we quantify the morphology in Lyα images: even if a variety of intrinsic conditions of the interstellar medium can favour the escape of Lyα photons, LARS-LAEs appear small in the continuum, and their Lyα is compact. LARS galaxies tend to be more extended in Lyα than in the rest-frame UV. It means that Lyα photons escape by forming haloes around HII regions of LARS galaxies. Conclusions. The stack of LARS-LAE Lyα images is peaked in the centre, indicating that the conditions, which make a galaxy an LAE, tend to produce a concentrated surface brightness profile. On the other hand, the stack of all LARS galaxies is shallower and more extended. This can be caused by the variety of dust and HI amount and distribution, which produces a more complex, patchy, and extended profile, like the one observed for Lyman break galaxies that can contribute to the stack. We cannot identify a single morphological property that controls whether a galaxy emits a net positive Lyα flux. However, the LARS-LAEs have continuum properties consistent with merging systems.

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SPECTRAL ENERGY DISTRIBUTION FITTING OF HETDEX PILOT SURVEY Lyα EMITTERS IN COSMOS AND GOODS-N

Cited by 57 publications

References 91 publications

The VIMOS Ultra Deep Survey: Lyαemission and stellar populations of star-forming galaxies at 2 < z < 2.5

The VIMOS Ultra Deep Survey: Lyαemission and stellar populations of star-forming galaxies at 2 < z < 2.5

On the universality of luminosity–metallicity and mass–metallicity relations for compact star-forming galaxies at redshifts 0 < z < 3

The Lyman alpha reference sample

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