Surface Brightness Profile of Lyman-α Halos out to 320 kpc in HETDEX

Niemeyer, Maja Lujan; Komatsu, Eiichiro; Byrohl, Chris; Davis, Dustin; Fabricius, Maximilian; Gebhardt, Karl; Hill, Gary J.; Wisotzki, L.; Bowman, W. Paul; Ciardullo, Robin; Farrow, Daniel J.; Finkelstein, Steven L.; Gawiser, Eric; Grönwall, C.; Jeong, Donghui; Landriau, Martin; Liu, Chenxu; Cooper, Erin Mentuch; Ouchi, Masami; Schneider, Donald P.; Zeimann, Greg

doi:10.3847/1538-4357/ac5cb8

Cited by 21 publications

(10 citation statements)

References 110 publications

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“…This could be a hint of the dominance of other processes. A similar conclusion of the dominance of scattered Lyα from central galaxies and possible contribution from the other processes is reached by recent observational studies (Lujan Niemeyer et al 2022a, 2022b. In this way, much information is buried beyond the flattening radius around 20 pkpc, outside of which contributions from central and satellites appear insufficient to explain the observations.…”

Section: Nonnegligible Contribution From In Situ Lyα Productionsupporting

confidence: 75%

“…The circumgalactic medium (CGM) contains vital information on these flow components and thus holds an important key to revealing galaxy evolution (see Tumlinson et al 2017, for a recent review). The CGM of z  2 star-forming galaxies is now routinely detected as diffuse Lyα nebulae, or Lyα halos (LAHs), around star-forming galaxies such as Lyα emitters (LAEs) and Lyman break galaxies (LBGs) at high redshift both individually (Rauch et al 2008;Wisotzki et al 2016;Leclercq et al 2017;Erb et al 2018;Bacon et al 2021;Kusakabe et al 2022) and through a stacking technique (Hayashino et al 2004;Steidel et al 2011;Matsuda et al 2012;Feldmeier et al 2013;Momose et al 2014Momose et al , 2016Xue et al 2017;Lujan Niemeyer et al 2022a, 2022b. Together with a technique based on absorption lines in the spectra of neighboring background sources (Adelberger et al 2005;Steidel et al 2010;Rudie et al 2012;Chen et al 2020;Muzahid et al 2021), LAHs have provided a crucial empirical window into the CGM of distant galaxies.…”

Section: Introductionmentioning

confidence: 99%

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UV and Lyα Halos of Lyα Emitters across Environments at z = 2.84*

Kikuta

Matsuda

Inoue

et al. 2023

ApJ

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We present UV and Lyα radial surface brightness (SB) profiles of Lyα emitters (LAEs) at z = 2.84 detected with the Hyper Suprime-Cam on the Subaru Telescope. The depth of our data, together with the wide-field coverage including a protocluster, enable us to study the dependence of Lyα halos (LAHs) on various galaxy properties, including Mpc scale environments. UV and Lyα images of 3490 LAEs are extracted, and stacking the images yields SB sensitivity of ∼ 1 × 10 − 20 erg s − 1 cm − 2 arcsec − 2 in Lyα, reaching the expected level of optically thick gas illuminated by the UV background at z ∼ 3. Fitting of the two-component exponential function gives the scale-lengths of 1.56 ± 0.01 and 10.4 ± 0.3 pkpc. Dividing the sample according to their photometric properties, we find that, while the dependence of halo scale-length on environment outside of the protocluster core is not clear, LAEs in the central regions of protoclusters appear to have very large LAHs, which could be caused by combined effects of source overlapping and diffuse Lyα emission from cool intergalactic gas permeating the forming protocluster core irradiated by active members. For the first time, we identify UV halos around bright LAEs that are probably due to a few lower-mass satellite galaxies. Through comparison with recent numerical simulations, we conclude that, while scattered Lyα photons from the host galaxies are dominant, star formation in satellites evidently contributes to LAHs, and that fluorescent Lyα emission may be boosted within protocluster cores at cosmic noon and/or near bright QSOs.

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Section: Nonnegligible Contribution From In Situ Lyα Productionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

UV and Lyα Halos of Lyα Emitters across Environments at z = 2.84*

Kikuta

Matsuda

Inoue

et al. 2023

ApJ

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“…The HETDEX survey is unique as it contains untargeted, deep, wide-field spectroscopic data. While HETDEX is at heart a highredshift galaxy survey (Davis et al 2021;Lujan Niemeyer et al 2022), it also obtains spectra of all other objects in its field of view, including stars of all types (Hawkins et al 2021), early-and late-type galaxies (Indahl et al 2021), high-redshift quasars (Zhang et al 2021;Liu et al 2022), and, in principle, SNe. The unbiased nature of the HETDEX spectroscopic selection function implies that there must exist spectra of anomalous, perhaps unprecedented, objects within the HETDEX continuum-source catalog.…”

Section: Introductionmentioning

confidence: 99%

Searching for Supernovae in HETDEX Data Release 3*

Vinkó

Thomas

Wheeler

et al. 2023

ApJ

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We have extracted 636 spectra taken at the positions of 583 transient sources from the third data release of the Hobby–Eberly Telescope Dark Energy eXperiment (HETDEX). The transients were discovered by the Zwicky Transient Facility (ZTF) during 2018–2022. The HETDEX spectra provide a potential means to obtain classifications for a large number of objects found by photometric surveys for free. We attempt to explore and classify the spectra by utilizing several template-matching techniques. We have identified two transient sources, ZTF20aatpoos = AT 2020fiz and ZTF19abdkelq, as supernova (SN) candidates. We classify AT 2020fiz as a Type IIP SN observed ∼10 days after explosion, and we propose ZTF19abdkelq as a likely Type Ia SN caught ∼40 days after maximum light. ZTF photometry of these two sources are consistent with their classifications as SNe. Beside these two objects, we have confirmed several ZTF transients as variable active galactic nuclei based on their spectral appearance, and determined the host galaxy types of several other ZTF transients.

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“…The filamentary structure of the cosmic web, which links galaxies to the intergalactic medium (IGM), is predicted to be a rich reservoir of nearly pristine gas (e.g., Fumagalli et al 2011;Giavalisco et al 2011). Reprocessed radiation from quasars or the ultraviolet (UV) background will ionize hydrogen atoms in the circumgalactic medium (CGM) and IGM (e.g., Gallego et al 2021;Borisova et al 2016;Lujan Niemeyer et al 2022), and the recombination of the ionized hydrogen will produce fluorescent Lyα emission, especially in the highredshift Universe (Cantalupo et al 2008;Li et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Probing the Diffuse Lyman-alpha Emission on Cosmological Scales: Lyα Emission Intensity Mapping Using the Complete SDSS-IV eBOSS Survey

Lin¹,

Zhang²,

Cai³

2022

Preprint

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Based on the Sloan Digital Sky Survey Data Release 16, we have detected the large-scale structure of Lyα emission in the Universe at redshifts z = 2-3.5 by cross-correlating quasar positions and Lyα emission imprinted in the residual spectra of luminous red galaxies. We apply an analytical model to fit the corresponding Lyα surface brightness profile and multipoles of the redshift-space quasar-Lyα emission cross-correlation function. The model suggests an average cosmic Lyα luminosity density of 6.6 +3.3 −3.1 × 10 40 erg s −1 cMpc −3 , a ∼ 2σ detection with a median value about 8-9 times those estimated from deep narrowband surveys of Lyα emitters at similar redshifts. Although the low signal-to-noise ratio prevents us from a significant detection of the Lyα forest-Lyα emission cross-correlation, the measurement is consistent with the prediction of our best-fit model from quasar-Lyα emission crosscorrelation within current uncertainties. We rule out the scenario that these Lyα photons mainly originate from quasars. We find that Lyα emission from star-forming galaxies, including contributions from that concentrated around the galaxy centers and that in the diffuse Lyα emitting halos, is able to explain the bulk of the the Lyα luminosity density inferred from our measurements. Ongoing and future surveys can further improve the measurements and advance our understanding of the cosmic Lyα emission field.

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Surface Brightness Profile of Lyman-α Halos out to 320 kpc in HETDEX

Cited by 21 publications

References 110 publications

UV and Lyα Halos of Lyα Emitters across Environments at z = 2.84*

UV and Lyα Halos of Lyα Emitters across Environments at z = 2.84*

Searching for Supernovae in HETDEX Data Release 3*

Probing the Diffuse Lyman-alpha Emission on Cosmological Scales: Lyα Emission Intensity Mapping Using the Complete SDSS-IV eBOSS Survey

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