PROFILES OF Lyα EMISSION LINES OF THE EMITTERS AT<i>z</i>= 3.1

Yamada, Tōru; Matsuda, Yoshihisa; Kousai, K.; Hayashino, T.; Morimoto, Naotake; Umemura, Masayuki

doi:10.1088/0004-637x/751/1/29

Cited by 76 publications

(106 citation statements)

References 43 publications

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“…We found this to be the best single value for achieving the highest S/N for the majority of LAEs in MUSE datacubes (HW17). Moreover, taking the instrumental resolution of MUSE into account, this value is also consistent with the expectations from the distributions of LAE FWHMs in the literature (e.g., Dawson et al 2007;Mallery et al 2012;Yamada et al 2012). Although the width of the spectral filter is optimised for LAEs, we emphasise that the resulting S/N of an Gaussian emission line decreases only as Fig.…”

Section: Cross-correlation With Matched Filtersupporting

confidence: 90%

The MUSE-Wide survey: A first catalogue of 831 emission line galaxies

Herenz

Urrutia

Wisotzki

et al. 2017

A&A

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We present a first instalment of the MUSE-Wide survey, covering an area of 22.2 arcmin 2 (corresponding to ∼20% of the final survey) in the CANDELS/Deep area of the Chandra Deep Field South. We use the MUSE integral field spectrograph at the ESO VLT to conduct a full-area spectroscopic mapping at a depth of 1 h exposure time per 1 arcmin 2 pointing. We searched for compact emission line objects using our newly developed LSDCat software based on a 3D matched filtering approach, followed by interactive classification and redshift measurement of the sources. Our catalogue contains 831 distinct emission line galaxies with redshifts ranging from 0.04 to 6. Roughly one third (237) of the emission line sources are Lyman α emitting galaxies with 3 < z < 6, only spectroscopic redshifts to photometric redshift estimates from the literature, we find excellent agreement for z < 1.5 with a median ∆z of only ∼4 × 10 −4 and an outlier rate of 6%, however a significant systematic offset of ∆z = 0.26 and an outlier rate of 23% for Lyα emitters at z > 3. Together with the catalogue we also release 1D PSF-weighted extracted spectra and small 3D datacubes centred on each of the 831 sources.

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Section: Cross-correlation With Matched Filtersupporting

confidence: 90%

The MUSE-Wide survey: A first catalogue of 831 emission line galaxies

Herenz

Urrutia

Wisotzki

et al. 2017

A&A

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“…In this case, even in the most extreme case of a purely external photoionizing source, a double peak similar to the observed peak would be produced (Cantalupo et al 2005;Verhamme et al 2015), so the answer is positive. Yamada et al (2012) observed 91 LAEs with a spectral resolution R 1700, very similar to that of MUSE. They show in their Fig.…”

Section: Two Other Probable Lyman Alpha Emitters At the Same Redshiftmentioning

confidence: 60%

“…5 the empirical relation between the velocity separation between the red and blue peaks and the FWHM of the stronger peak. Our LAE1 object has a rather small velocity separation (392±36 km s −1 ) for the width of the stronger (red) peak, sending its representative point onto the lower envelope defined by the objects of Yamada et al (2012). It is also reminiscent of the Lyman continuum emitters (LCEs) examined by Verhamme et al (2017).…”

Section: Two Other Probable Lyman Alpha Emitters At the Same Redshiftmentioning

confidence: 88%

MUSE-inspired view of the quasar Q2059-360, its Lyman α blob, and its neighborhood

North

Marino

Gorgoni

et al. 2017

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The radio-quiet quasar Q2059-360 at redshift z = 3.08 is known to be close to a small Lyman α blob (LAB) and to be absorbed by a proximate damped Lyα (PDLA) system. Here, we present the Multi Unit Spectroscopic Explorer (MUSE) integral field spectroscopy follow-up of this quasi-stellar object (QSO). Our primary goal is to characterize this LAB in detail by mapping it both spatially and spectrally using the Lyα line, and by looking for high-ionization lines to constrain the emission mechanism. Combining the high sensitivity of the MUSE integral field spectrograph mounted on the Yepun telescope at ESO-VLT with the natural coronograph provided by the PDLA, we map the LAB down to the QSO position, after robust subtraction of QSO light in the spectral domain. In addition to confirming earlier results for the small bright component of the LAB, we unveil a faint filamentary emission protruding to the south over about 80 pkpc (physical kpc); this results in a total size of about 120 pkpc. We derive the velocity field of the LAB (assuming no transfer effects) and map the Lyα line width. Upper limits are set to the flux of the N v λ1238 − 1242, C iv λ1548 − 1551, He ii λ1640, and C iii] λ1548 − 1551 lines. We have discovered two probable Lyα emitters at the same redshift as the LAB and at projected distances of 265 kpc and 207 kpc from the QSO; their Lyα luminosities might well be enhanced by the QSO radiation. We also find an emission line galaxy at z = 0.33 near the line of sight to the QSO. This LAB shares the same general characteristics as the 17 others surrounding radio-quiet QSOs presented previously. However, there are indications that it may be centered on the PDLA galaxy rather than on the QSO.

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“…A significant fraction of spectra also shows characteristic double peaks, with the red peak often being stronger than the blue (e.g. Tapken et al 2004Tapken et al , 2007Yamada et al 2012;Hong et al 2014;Henry et al 2015;Yang et al 2015). Interestingly, a high percentage of double peaked and asymmetric Lyα profiles appear well explained by the spherical symmetric scenarios mentioned above.…”

Section: Introductionmentioning

confidence: 94%

The Lyman alpha reference sample

Herenz

Gruyters

Orlitová

et al. 2016

A&A

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We present integral field spectroscopic observations with the Potsdam Multi-Aperture Spectrophotometer of all 14 galaxies in the z ∼ 0.1 Lyman Alpha Reference Sample (LARS). We produce 2D line-of-sight velocity maps and velocity dispersion maps from the Balmer α (Hα) emission in our data cubes. These maps trace the spectral and spatial properties of the LARS galaxies' intrinsic Lyα radiation field. We show our kinematic maps that are spatially registered onto the Hubble Space Telescope Hα and Lyman α (Lyα) images. We can conjecture a causal connection between spatially resolved Hα kinematics and Lyα photometry for individual galaxies, however, no general trend can be established for the whole sample. Furthermore, we compute the intrinsic velocity dispersion σ 0 , the shearing velocity v shear , and the v shear /σ 0 ratio from our kinematic maps. In general LARS galaxies are characterised by high intrinsic velocity dispersions (54 km s −1 median) and low shearing velocities (65 km s −1 median). The v shear /σ 0 values range from 0.5 to 3.2 with an average of 1.5. It is noteworthy that five galaxies of the sample are dispersion-dominated systems with v shear /σ 0 < 1, and are thus kinematically similar to turbulent star-forming galaxies seen at high redshift. When linking our kinematical statistics to the global LARS Lyα properties, we find that dispersion-dominated systems show higher Lyα equivalent widths and higher Lyα escape fractions than systems with v shear /σ 0 > 1. Our result indicates that turbulence in actively star-forming systems is causally connected to interstellar medium conditions that favour an escape of Lyα radiation.

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PROFILES OF Lyα EMISSION LINES OF THE EMITTERS ATz= 3.1

Cited by 76 publications

References 43 publications

The MUSE-Wide survey: A first catalogue of 831 emission line galaxies

The MUSE-Wide survey: A first catalogue of 831 emission line galaxies

MUSE-inspired view of the quasar Q2059-360, its Lyman α blob, and its neighborhood

The Lyman alpha reference sample

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