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The MUSE Ultra Deep Field (MUDF)
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DOI：10.1051/0004-6361/202452462.png)
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Abstract
En 中文
We present new ALMA continuum and spectral observations of the MUSE Ultra Deep Field (MUDF), a 2x2 arcmin2 region with ultradeep multiwavelength imaging and spectroscopy hosting two bright z approximate to 3.22 quasars used to study intervening gas structures in absorption. Through a blind search for dusty galaxies, we identified a total of seven high-confidence sources, six of which have secure spectroscopic redshifts. We estimate galaxy dust and stellar masses (M-dust similar or equal to 10(7.8-8.6) M circle dot, M star similar or equal to 10(10.2-10.7) M-circle dot), as well as star formation rates (SFR similar or equal to 10(1.2-2.0) M-circle dot yr(-1)) which show that most of these galaxies are massive and dust-obscured resembling (sub)millimeter galaxies at similar epochs. All six spectroscopically confirmed galaxies are within 500 km s-1 of metal absorption lines observed in the quasar sightlines, corresponding to 100% association rate. We also find that four of these galaxies belong to groups in which they are among the most massive members. The galaxies identified with ALMA are rarely found close in projection to the background quasars, likely due to the modest surface density of this population. Consequently, most of the absorbers observed in the quasar spectra originate from gas distributed within large-scale structures or from the CGM of other group members surrounding these dusty star-forming systems. While ALMA-detected sources are not always the nearest in spatial projection, they frequently align closely in velocity space (<= 50 km s-1) with the absorption centroids. This suggests that these massive galaxies reside at the center of the gravitational potential wells of the gas structures traced in absorption.
Keywords:
galaxies: evolution
galaxies: halos
galaxies: high-redshift
quasars: absorption lines
submillimeter: general
quasars: individual: MUDF
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5.8
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5.0W
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18.3W
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