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

Abstract

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.

Physical properties of the CDFS X-ray sources through fitting spectral energy distributions

“…We collect spectroscopic redshifts for 537 X-ray sources. The spectroscopic redshifts of 468 X-ray sources are from the 7 Ms catalog, and 69 X-ray sources are from 3D-HST survey (Momcheva et al 2016), Inami et al (2017), Herenz et al (2017), and VANDELS 1 (Pentericci et al 2018), respectively. There are still 254 X-ray sources without spectroscopic redshifts.…”

“…Table 1 present the redshift, the class and the origin of the redshift, respectively. "M16", "S16", "H17", "I17", and "P18" represent 3D-HST catalog, ZFOURGE catalog, Inami et al (2017), Herenz et al (2017), and VANDELS catalog, respectively. Columns 2 and 3 of Table 3 are redshift and redshift type of each X-ray source.…”

A simultaneous search for high-z LAEs and LBGs in the SHARDS survey

“…Traditionally, LAEs have been detected using narrow band filters while broad band filters are used to detect LBGs. In addition, multi-object or integral field spectroscopy have been used recently to successfully detect high-z sources (e.g., Herenz et al 2017). Many previous studies have dealt with both types of objects at different redshifts (e.g., Hu et al 1998;Shapley et al 2003;Steidel et al 2003;Malhotra & Rhoads 2004;Steidel et al 2005;Gronwall et al 2007;Iwata et al 2007;Ouchi et al 2008;McLure et al 2009;Oesch et al 2010;Ouchi et al 2010;van der Burg et al 2010;Bouwens et al 2014Bouwens et al , 2015Cassata et al 2015;Sobral et al 2017,b, among others).…”

LSDCat: Detection and cataloguing of emission-line sources in integral-field spectroscopy datacubes

“…Herenz & L. Wisotzki) is given. A link to download the software is provided on the MUSE Science Web Service 9 , and it is also available via the Astrophysics Source Code Library 10 (Herenz & Wistozki 2016). LSDCat is documented in two ways.…”

“…These are based on our experience with applying the code on MUSE datacubes, searching for faint emission lines from high-redshift galaxies (first results presented in Bacon et al 2015;and Bina et al 2016; more will be reported in Herenz et al 2017). We intend these guidelines to be instructive for the potential LSDCat user, but they should not be understood as recipes.…”