Two Lensed Lyman-alpha Emitting Galaxies at z~5

Abstract

We present observations of two strongly lensed $z\sim 5$ Lyman-$\alpha$ Emitting (LAE) galaxies that were discovered in the Sloan Giant Arcs Survey (SGAS). We identify the two sources as SGAS J091541+382655, at $z=5.200$, and SGAS J134331+415455 at $z=4.994$. We measure their AB magnitudes at $(i,z)=(23.34\pm 0.09,23.29\pm 0.13$) mags and $(i,z)=(23.78\pm 0.18,24.24_{-0.16}^{+0.18}$) mags, and the rest-frame equivalent widths of the Lyman-$\alpha$ emission at $25.3\pm 4.1$Å~and $135.6\pm 20.3$Å~for SGAS J091541+382655 and SGAS J134331+415455, respectively. Each source is strongly lensed by a massive galaxy cluster in the foreground, and the magnifications due to gravitational lensing are recovered from strong lens modeling of the foreground lensing potentials. We use the magnification to calculate the intrinsic, unlensed Lyman-$\alpha$ and UV continuum luminosities for both sources, as well as the implied star formation rates (SFR). We find SGAS J091541+382655 and SGAS J134341+415455 to be galaxies with (L${}_{Ly-\alpha }$, L${}_{UV})\le (0.6$L${}_{Ly-\alpha }^{\ast },2$L${}_{UV}^{\ast }$) and (L${}_{Ly-\alpha }$, L${}_{UV})=(0.5$L${}_{Ly-\alpha }^{\ast },0.9$L${}_{UV}^{\ast }$), respectively. Comparison of the spectral energy distributions (SEDs) of both sources against stellar population models produces estimates of the mass in young stars in each galaxy: we report an upper limit of M${}_{stars}\le 7.9_{-2.5}^{+3.7}\times 10^7$ M$_{\sun} h_{0.7}^{-1}$ for SGAS J091531+382655, and a range of viable masses for SGAS J134331+415455 of $2\times 10^8$ M$_{\sun} h_{0.7}^{-1} <$ M${}_{stars}<6\times 10^9$ M$_{\sun} h_{0.7}^{-1}$.

10 pages, 8 figures, emulate apj format, Accepted to ApJ

References in corpus (52)

• Stellar population synthesis at the resolution of 2003
• The Sloan Digital Sky Survey: Technical Summary
• Galactic Stellar and Substellar Initial Mass Function
• Star Formation in Galaxies Along the Hubble Sequence
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Detailed Structural Decomposition of Galaxy Images
• Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies
• A New Method For Galaxy Cluster Detection I: The Algorithm
• A Bayesian approach to strong lensing modelling of galaxy clusters
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• The Lyman Alpha Forest in the Spectra of QSOs
• Spectroscopy of Lyman Break Galaxies in the Hubble Deep Field
• The Ultraviolet Spectrum of MS 1512-cB58: An Insight into Lyman Break Galaxies
• Keck Spectroscopy of Redshift z~3 Galaxies in the Hubble Deep Field
• Ly-alpha Emission-Line Galaxies at z = 3.1 in the Extended Chandra Deep Field South
• Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
• High-z Lyman-alpha Emitters. I. A Blank-Field Search for Objects Near Redshift z=3.4 in and around the Hubble Deep Field and the Hawaii Deep Field SSA22
• Ly Alpha Emitters at z=5.7 in the Subaru Deep Field
• First Results from the Large Area Lyman Alpha Survey
• The Luminosity Function of Lyman Alpha Emitters at Redshift z~5.7
• On the Stellar Populations and Evolution of Star-Forming Galaxies at 6.3 < z < 8.6
• Spectroscopic Confirmation of Three Redshift 5.7 Lyman-alpha Emitters from the Large Area Lyman Alpha Survey
• The Physical Nature of Lyman Alpha Emitting Galaxies at z=3.1
• Properties of Ly-alpha emitters around the radio galaxy MRC 0316-257
• The luminosity function, halo masses and stellar masses of luminous Lyman-break galaxies at redshifts 5<z<6
• Lyman Alpha Galaxies: Primitive, Dusty or Evolved Galaxies?
• Evolution in the properties of Lyman-alpha emitters from redshifts z ~ 3 to z ~ 2
• Optical to mid-IR observations of Lyman-alpha galaxies at redshift 5 in the HUDF: a young and low mass population
• Microslit Nod-shuffle Spectroscopy - a technique for achieving very high densities of spectra
• A Luminosity Function of Lyman Alpha Emitting Galaxies at Redshift 4.5
• A New Survey for Giant Arcs
• Effects of Dust Geometry in Lyman Alpha Galaxies at z = 4.4
• Lyman Alpha Emitters at Redshift 5.7 in the COSMOS Field
• Detection of PAH and Far-Infrared Emission from the Cosmic Eye: Probing the Dust and Star Formation of Lyman Break Galaxies
• A very bright, highly magnified Lyman-break galaxy at z=3.07
• Lyman alpha emission in high-redshift galaxies
• The 8 o'clock Arc: A Serendipitous Discovery of a Strongly Lensed Lyman Break Galaxy in the SDSS DR4 Imaging Data
• The Stellar Population of Lyman-alpha Emitting Galaxies at z ~ 5.7
• Spitzer Constraints on the z=6.56 Galaxy Lensed by Abell 370
• The Stellar Populations of Lyman Break Galaxies at z~5
• A Study of Interstellar Gas and Stars in the Gravitationally Lensed Galaxy `The Cosmic Eye' from Rest-Frame Ultraviolet Spectroscopy
• The Sloan Bright Arcs Survey: Four Strongly Lensed Galaxies with Redshift >2
• Sizes of Lyman-Alpha-Emitting Galaxies and Their Rest-Frame Ultraviolet Components at z=3.1
• Turning Back the Clock: Inferring the History of the Eight O'clock Arc
• A Lyman alpha emitter at z = 6.5 found with slitless spectroscopy
• A z=0.9 supercluster of X-ray luminous, optically-selected, massive galaxy clusters
• Evidence for Spatially Compact Lyman Alpha Emission in z=3.1 Lyman-Alpha-Emitting Galaxies
• A Subaru Search for Lyman-Alpha Emitters at z=5.8 with an Intermediate-Band Filter
• The DEEP2 Redshift Survey: Lyman Alpha Emitters in the Spectroscopic Database
• An Intermediate-band imaging survey for high-redshift Lyman Alpha Emitters: The Mahoroba-11
• Discovery of four gravitational lensing systems by clusters in the SDSS DR6

Cited by in corpus (23)

• Combined strong and weak lensing analysis of 28 clusters from the Sloan Giant Arcs Survey
• Gravitationally Lensed Galaxies at 2<z<3.5: Direct Abundance Measurements of Lya Emitters
• Probability Distribution Functions of Cosmological Lensing: Convergence, Shear, and Magnification
• The Lyman-alpha luminosity function at z=5.7-6.6 and the steep drop of the faint end: implications for reionization
• The Physical Conditions, Metallicity and Metal Abundance Ratios In a Highly Magnified Galaxy at z = 3.6252
• Gemini/GMOS Spectroscopy of 26 Strong Lensing Selected Galaxy Cluster Cores
• The BOSS Emission-Line Lens Survey. III. : Strong Lensing of Ly$\alpha$ Emitters by Individual Galaxies
• Constraints on the low-mass end of the mass-metallicity relation at z=1-2 from lensed galaxies
• Strong Lens Models for 37 Clusters of Galaxies from the SDSS Giant Arcs Survey
• SPT-GMOS: A Gemini/GMOS-South Spectroscopic Survey of Galaxy Clusters in the SPT-SZ Survey
• Two Lensed z~3 Lyman Break Galaxies Discovered in the SDSS Giant Arcs Survey
• Line-of-Sight Structure Toward Strong Lensing Galaxy Clusters
• Sunyaev Zel'dovich Effect Observations of Strong Lensing Galaxy Clusters: Probing the Over-Concentration Problem
• The Effect of Large-Scale Structure on the Magnification of High-Redshift Sources by Cluster-Lenses
• The Mass Distribution of the Strong Lensing Cluster SDSS J1531+3414
• VLT/Magellan spectroscopy of 29 strong lensing selected galaxy clusters
• SGAS 143845.1+145407: A Big, Cool Starburst at Redshift 0.816
• Spatially Resolved Patchy Lyman-$\alpha$ Emission Within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8
• Constraining the Minimum Luminosity of High Redshift Galaxies through Gravitational Lensing
• Searching for Cooling Signatures in Strong Lensing Galaxy Clusters: Evidence Against Baryons Shaping the Matter Distribution in Cluster Cores
• Galaxy scale lenses in the RCS2: I. First Catalog of Candidate Strong Lenses
• Probing Individual Star Forming Regions Within Strongly Lensed Galaxies at z > 1
• Core Mass Estimates in Strong Lensing Galaxy Clusters: a Comparison Between Masses Obtained from Detailed Lens Models, Single-Halo Lens Models, and Einstein Radii