Modeling 237 Lyman-<i>α</i>spectra of the MUSE-Wide survey

Grönke, Max

doi:10.1051/0004-6361/201731791

Cited by 69 publications

(82 citation statements)

References 78 publications

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“…Initial results from our first installment of 24 fields include a measurement of the clustering properties of LAEs (Diener et al 2017), an estimate of the Lyα emitting fraction among high-redshift galaxies (Caruana et al 2018) and a determination of the Lyα luminosity function (Herenz et al 2019). Already our first sample of 237 LAEs constituted one of the largest existing sets of high-z Lyα spectra, especially when demanding a spectral resolution good enough to study the line profiles in some detail (Gronke 2017).…”

Section: A Spectroscopic Sample Of 1000 Lyman-α Emitting Galaxiesmentioning

confidence: 99%

The MUSE-Wide Survey: survey description and first data release

Urrutia

Wisotzki

Kerutt

et al. 2019

A&A

109

105

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We present the MUSE-Wide survey, a blind, 3D spectroscopic survey in the CANDELS/GOODS-S and CANDELS/COSMOS regions. The final survey will cover 100 × 1 arcmin 2 MUSE fields. Each MUSE-Wide pointing has a depth of 1 hour and hence targets more extreme and more luminous objects over 10 times the area of the MUSE-Deep fields . The legacy value of MUSE-Wide lies in providing "spectroscopy of everything" without photometric pre-selection. We describe the data reduction, post-processing and PSF characterization of the first 44 CANDELS/GOODS-S MUSE-Wide pointings released with this publication. Using a 3D matched filtering approach we detect 1,602 emission line sources, including 479 Lyman-α (Lyα) emitting galaxies with redshifts 2.9 z 6.3. We cross-match the emission line sources to existing photometric catalogs, finding almost complete agreement in redshifts (photometric and spectroscopic) and stellar masses for our low redshift (z < 1.5) emitters. At high redshift, we only find ∼55% matches to photometric catalogs. We encounter a higher outlier rate and a systematic offset of ∆z 0.2 when comparing our MUSE redshifts with photometric redshifts from the literature. Cross-matching the emission line sources with X-ray catalogs from the Chandra Deep Field South, we find 127 matches, mostly in agreement with the literature redshifts, including 10 objects with no prior spectroscopic identification. Stacking X-ray images centered on our Lyα emitters yields no signal; the Lyα population is not dominated by even low luminosity AGN. Other cross-matches of our emission-line catalog to radio and submm data, yielded far lower numbers of matches, most of which already were covered by the X-ray catalog. A total of 9,205 photometrically selected objects from the CANDELS survey lie in the MUSE-Wide footprint, which we provide optimally extracted 1D spectra of. We are able to determine the spectroscopic redshift of 98% of 772 photometrically selected galaxies brighter than 24th F775W magnitude. All the data in the first data release -datacubes, catalogs, extracted spectra, maps -are available on the website https://musewide.aip.de.

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Section: A Spectroscopic Sample Of 1000 Lyman-α Emitting Galaxiesmentioning

confidence: 99%

The MUSE-Wide Survey: survey description and first data release

Urrutia

Wisotzki

Kerutt

et al. 2019

A&A

109

105

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“…Finally, the red tail can give us information on the offset velocity of the medium, its optical depth and the hydrogen column density. Radiative transfer models like the ones by Verhamme et al (2008) or the more recent ones by Gronke (2017), can help disentangle the state of the gas and dust around Fig. 3: Zoom-in of the spectra of our MUSE/SMUVS Lyα emitters.…”

Section: Lyman α Emittersmentioning

confidence: 99%

Bright Lyman-α emitters among Spitzer SMUVS galaxies in the MUSE/COSMOS field

Rosani

Caminha

Caputi

et al. 2020

A&A

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We search for the presence of bright Lyα emitters among Spitzer SMUVS galaxies at z > 2.9 making use of homogeneous MUSE spectroscopic data. Although these data only cover a small region of COSMOS, MUSE has the unique advantage of providing spectral information over the entire field, without the need of target pre-selection. This results in an unbiased detection of all the brightest Lyα emitters among the SMUVS sources, which by design are stellar-mass selected galaxies. Within the studied area, ∼ 14% of the SMUVS galaxies at z > 2.9 have Lyα fluxes F λ 7 × 10 −18 erg s −1 cm −2 . These Lyα emitters are characterized by three types of emission, 47% show a single line profile, 19% present a double peak or a blue bump and 31% show a red tail. One object (3%) shows both a blue bump and a red tail. We also investigate the spectral energy distribution (SED) properties of the SMUVS galaxies which are MUSE detected and which are not. After stellar-mass matching both populations, we find that the MUSE detected galaxies have generally lower extinction than SMUVS-only objects, while there is no clear intrinsic difference in the mass and age distributions of the two samples. For the MUSE-detected SMUVS galaxies, we compare the instantaneous SFR lower limit obtained from the Lyα line with its past average derived from SED fitting, and find evidence for rejuvenation in some of our oldest objects. In addition, we study the spectra of those Lyα emitters which are not detected in SMUVS in the same field. We find that the emission line profile shown are 67% a single line, 3% a blue bump and 20% a red tail profile. The difference in profile distribution could be ascribed to the fainter Lyα luminosities of the MUSE sources not detected in SMUVS and an intrinsically different mass distribution. Finally, we search for the presence of galaxy associations using the spectral redshifts. MUSE's integral coverage reveals that these associations are 20 times more likely than what is derived from all the other existing spectral data in COSMOS, which is biased by target pre-selection.

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“…Dijkstra et al (2016) also argued that CR7's Lyα line is well explained by outflowing shell models, similarly to lower redshift Lyα emitters (e.g. Karman et al 2017;Gronke 2017).…”

Section: Introductionmentioning

confidence: 98%

On the nature and physical conditions of the luminous Ly α emitter CR7 and its rest-frame UV components

Sobral

Matthee

Brammer

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present new HST/WFC3 observations and re-analyse VLT data to unveil the continuum, variability and rest-frame UV lines of the multiple UV clumps of the most luminous Lyα emitter at z = 6.6, CR7. Our re-reduced, flux calibrated X-SHOOTER spectra of CR7 reveal a Heii emission line in observations obtained along the major axis of Lyα emission with the best seeing conditions. Heii is spatially offset by ≈ +0.8 from the peak of Lyα emission, and it is found towards clump B. Our WFC3 grism spectra detects the UV continuum of CR7's clump A, yielding a power law with β = −2.5 +0.6 −0.7 and M U V = −21.87 +0.25 −0.20 . No significant variability is found for any of the UV clumps on their own, but there is tentative (≈ 2.2 σ) brightening of CR7 in F110W as a whole from 2012 to 2017. HST grism data fail to robustly detect rest-frame UV lines in any of the clumps, implying fluxes < ∼ 2 × 10 −17 erg s −1 cm −2 (3 σ). We perform cloudy modelling to constrain the metallicity and the ionising nature of CR7. CR7 seems to be actively forming stars without any clear AGN activity in clump A, consistent with a metallicity of ∼ 0.05 − 0.2 Z . Component C or an inter-clump component between B and C may host a high ionisation source. Our results highlight the need for spatially resolved information to study the formation and assembly of early galaxies.

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Modeling 237 Lyman-αspectra of the MUSE-Wide survey

Cited by 69 publications

References 78 publications

The MUSE-Wide Survey: survey description and first data release

The MUSE-Wide Survey: survey description and first data release

Bright Lyman-α emitters among Spitzer SMUVS galaxies in the MUSE/COSMOS field

On the nature and physical conditions of the luminous Ly α emitter CR7 and its rest-frame UV components

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