The Hetdex Pilot Survey. I. Survey Design, Performance, and Catalog of Emission-Line Galaxies

Adams, Joshua J.; Blanc, Guillermo A.; Hill, Gary J.; Gebhardt, Karl; Drory, Niv; Hao, Lei; Bender, Ralf; Byun, Joyce; Ciardullo, Robin; Cornell, Mark E.; Finkelstein, Steven L.; Fry, Alex; Gawiser, Eric; Grönwall, C.; Hopp, U.; Jeong, Donghui; Kelz, Andreas; Kelzenberg, Ralf; Komatsu, Eiichiro; MacQueen, Phillip J.; Murphy, J.H.; Odoms, P. Samuel; Roth, Martin; Schneider, Donald P.; Tufts, Joseph R.; Wilkinson, Christopher

doi:10.1088/0067-0049/192/1/5

Cited by 153 publications

(149 citation statements)

References 121 publications

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“…A complete description of this pathfinding survey and its data products is given in Adams et al (2011). Briefly, a square 246-fiber array was mounted on the Harlan J. Smith 2.7 m telescope at McDonald Observatory and coupled to the George and Cynthia Mitchell Spectrograph, a proto-type of the Visible Integral-field Replicable Unit Spectrograph (VIRUS) designed for HETDEX (Hill et al 2008b).…”

Section: The Hetdex Pilot Survey Datamentioning

confidence: 99%

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THE HETDEX PILOT SURVEY. IV. THE EVOLUTION OF [O II] EMITTING GALAXIES FROMz∼ 0.5 TOz∼ 0

Ciardullo

Grönwall

Adams

et al. 2013

ApJ

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We present an analysis of the luminosities and equivalent widths of the 284 z < 0.56 [O ii]-emitting galaxies found in the 169 arcmin 2 pilot survey for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). By combining emission-line fluxes obtained from the Mitchell spectrograph on the McDonald 2.7 m telescope with deep broadband photometry from archival data, we derive each galaxy's dereddened [O ii] λ3727 luminosity and calculate its total star formation rate. We show that over the last ∼5 Gyr of cosmic time, there has been substantial evolution in the [O ii] emission-line luminosity function, with L * decreasing by ∼0.6 ± 0.2 dex in the observed function, and by ∼0.9 ± 0.2 dex in the dereddened relation. Accompanying this decline is a significant shift in the distribution of [O ii] equivalent widths, with the fraction of high equivalent-width emitters declining dramatically with time. Overall, the data imply that the relative intensity of star formation within galaxies has decreased over the past ∼5 Gyr, and that the star formation rate density of the universe has declined by a factor of ∼2.5 between z ∼ 0.5 and z ∼ 0. These observations represent the first [O ii]-based star formation rate density measurements in this redshift range, and foreshadow the advancements which will be generated by the main HETDEX survey.

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Section: The Hetdex Pilot Survey Datamentioning

confidence: 99%

“…In Adams et al (2011), X-ray counterparts were identified for 30 of the HETDEX pilot survey's [O ii] emitters. However, many of these objects are in the GOODS-N region, where the Chandra images are deep enough to detect the X-rays associated with normal star formation (e.g., Persic et al 2004;Lehmer et al 2010).…”

Section: The Hetdex Pilot Survey Datamentioning

confidence: 99%

THE HETDEX PILOT SURVEY. IV. THE EVOLUTION OF [O II] EMITTING GALAXIES FROMz∼ 0.5 TOz∼ 0

Ciardullo

Grönwall

Adams

et al. 2013

ApJ

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“…Rhoads et al 2000;Ouchi et al 2008;Ciardullo et al 2012), long-slit spectroscopy (Rauch et al 2008;Cassata et al 2011) or integral field spectroscopy (e.g. Petitjean et al 1996;Adams et al 2011). Because their selection is independent of the stellar continuum, these galaxies are often faint in broad-band imaging and likely represent lowmass systems with little dust attenuation (Gawiser et al 2007).…”

Section: Introductionmentioning

confidence: 99%

A connection between extremely strong damped Lyman-αsystems and Lyman-αemitting galaxies at small impact parameters

Noterdaeme

Petitjean

Pâris

et al. 2014

A&A

107

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We present a study of ∼100 high redshift (z ∼ 2−4) extremely strong damped Lyman-α systems (ESDLA, with N(H i) ≥ 0.5 × 10 22 cm −2 ) detected in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS-III) Data Release 11. We study the neutral hydrogen, metal, and dust content of this elusive population of absorbers and confirm our previous finding that the high column density end of the N(H i) frequency distribution has a relatively shallow slope with power-law index −3.6, similar to what is seen from 21-cm maps in nearby galaxies. The stacked absorption spectrum indicates a typical metallicity ∼1/20th solar, similar to the mean metallicity of the overall DLA population. The relatively small velocity extent of the low-ionisation lines suggests that ESDLAs do not arise from large-scale flows of neutral gas. The high column densities involved are in turn more similar to what is seen in DLAs associated with gamma-ray burst afterglows (GRB-DLAs), which are known to occur close to star-forming regions. This indicates that ESDLAs arise from a line of sight passing at very small impact parameters from the host galaxy, as observed in nearby galaxies. This is also supported by simple theoretical considerations and recent high-z hydrodynamical simulations. We strongly substantiate this picture by the first statistical detection of Ly α emission with L ESDLA (Ly α) (0.6 ± 0.2) × 10 42 erg s −1 in the core of ESDLAs (corresponding to about 0.1 L at z ∼ 2−3), obtained through stacking the fibre spectra (of radius 1 corresponding to ∼8 kpc at z ∼ 2.5). Statistical errors on the Ly α luminosity are of the order of 0.1 × 10 42 erg s −1 but we caution that the measured Ly α luminosity may be overestimated by ∼35% due to sky light residuals and/or FUV emission from the quasar host and that we have neglected flux-calibration uncertainties. We estimate a more conservative uncertainty of 0.2 × 10 42 erg s −1 . The properties of the Ly α line (luminosity distribution, velocity width and velocity offset compared to systemic redshift) are very similar to that of the population of Lyman-α emitting galaxies (LAEs) with L LAE (Ly α) ≥ 10 41 erg s −1 detected in long-slit spectroscopy or narrow-band imaging surveys. By matching the incidence of ESDLAs with that of the LAEs population, we estimate the high column density gas radius to be about r gas = 2.5 kpc, i.e., significantly smaller than the radius corresponding to the BOSS fibre aperture, making fibre losses likely negligible. Finally, the average measured Ly α luminosity indicates a star-formation rate consistent with the Schmidt-Kennicutt law, SFR (M yr −1 ) ≈ 0.6/ f esc , where f esc < 1 is the Ly α escape fraction. Assuming the typical escape fraction of LAEs, f esc ∼ 0.3, the Schmidt-Kennicutt law implies a galaxy radius of about r gal ≈ 2.5 kpc. Finally, we note that possible overestimation of the Ly α emission would result in both smaller r gas and r gal . Our results support a close association between LAEs and stro...

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“…Galaxies detected by their strong Lyman-α (Lyα) emission, called Lyα emitters (LAEs), have become an important tool in understanding cosmology at intermediate-to-high redshifts (z > 1.5), such as for the large-scale matter distribution (Hill et al 2008;Adams et al 2011) or the epoch of reionization via the connection of LAEs and Lyman-continuum leakers (Behrens et al 2014;Verhamme et al 2014;Dijkstra 2014). The physical type(s) of objects classified as LAEs and the connection of the observed line profiles to the physical properties of the emitters are still a matter of debate, though progress has been made in recent years (e.g., Ahn et al 2003;Verhamme et al 2006;Dijkstra & White 2010).…”

Section: Introductionmentioning

confidence: 99%

Inclination dependence of Lyman-αproperties in a turbulent disk galaxy

Behrens

Braun

2014

A&A

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We present simulations of Lyman-α radiation transfer in an isolated disk galaxy with a turbulence subgrid model, multiphase interstellar medium and detailed star formation modeling. We investigate the influence of inclination on the observed Lyα properties for different snapshots. The Lyα spectrum, equivalent width distribution, and escape fractions vary significantly with the detailed morphology of the disk, leading to variations from one snapshot to another. In particular, we find that supernova-driven cavities near star-forming regions in the simulation can dominate the transmitted Lyα fraction, suggesting a variability of Lyman-α emitters on the timescales of the star formation activity.

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The Hetdex Pilot Survey. I. Survey Design, Performance, and Catalog of Emission-Line Galaxies

Cited by 153 publications

References 121 publications

THE HETDEX PILOT SURVEY. IV. THE EVOLUTION OF [O II] EMITTING GALAXIES FROMz∼ 0.5 TOz∼ 0

THE HETDEX PILOT SURVEY. IV. THE EVOLUTION OF [O II] EMITTING GALAXIES FROMz∼ 0.5 TOz∼ 0

A connection between extremely strong damped Lyman-αsystems and Lyman-αemitting galaxies at small impact parameters

Inclination dependence of Lyman-αproperties in a turbulent disk galaxy

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