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The MeerKAT Absorption Line Survey (MALS) | | N. Gupta
; R. Srianand
; W. Baan
; A. Baker
; R. Beswick
; S. Bhatnagar
; D. Bhattacharya
; A. Bosma
; C. Carilli
; M. Cluver
; F. Combes
; C. Cress
; R. Dutta
; J. Fynbo
; G. Heald
; M. Hilton
; T. Hussain
; M. Jarvis
; G. Jozsa
; P. Kamphuis
; A. Kembhavi
; J. Kerp
; H.-R. Klöckner
; J. Krogager
; V. Kulkarni
; C. Ledoux
; A. Mahabal
; T. Mauch
; K. Moodley
; E. Momjian
; R. Morganti
; P. Noterdaeme
; T. Oosterloo
; P. Petitjean
; A. Schröder
; P. Serra
; J. Sievers
; K. Spekkens
; P. Väisänen
; T. van der Hulst
; M. Vivek
; J. Wang
; O.I. Wong
; A.R. Zungu
; | | Date: |
24 Aug 2017 | | Abstract: | Deep galaxy surveys have revealed that the global star formation rate (SFR)
density in the Universe peaks at 1 < z < 2 and sharply declines towards z = 0.
But a clear picture of the underlying processes, in particular the evolution of
cold atomic (~100 K) and molecular gas phases, that drive such a strong
evolution is yet to emerge. MALS is designed to use MeerKAT’s L- and UHF-band
receivers to carry out the most sensitive (N(HI)>10$^{19}$ cm$^{-2}$)
dust-unbiased search of intervening HI 21-cm and OH 18-cm absorption lines at 0
< z < 2. This will provide reliable measurements of the evolution of cold
atomic and molecular gas cross-sections of galaxies, and unravel the processes
driving the steep evolution in the SFR density. The large sample of HI and OH
absorbers obtained from the survey will (i) lead to tightest constraints on the
fundamental constants of physics, and (ii) be ideally suited to probe the
evolution of magnetic fields in disks of galaxies via Zeeman Splitting or
Rotation Measure synthesis. The survey will also provide an unbiased census of
HI and OH absorbers, i.e. cold gas associated with powerful AGNs (>10$^{24}$ W
Hz$^{-1}$) at 0 < z < 2, and will simultaneously deliver a blind HI and OH
emission line survey, and radio continuum survey. Here, we describe the MALS
survey design, observing plan and the science issues to be addressed under
various science themes. | | Source: | arXiv, 1708.7371 | | Services: | Forum | Review | PDF | Favorites | |
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