J/A+A/658/A77 MUltiwavelength study of ELAN environments (Nowotka+, 2022)
A MUltiwavelength Study of ELAN Environments (AMUSE2).
Ubiquitous dusty star-forming galaxies associated with enormous Lyα
nebulae on megaparsec scales.
Nowotka M., Chen C.-C., Battaia F.A., Fumagalli M., Cai Z., Lusso E.,
Prochaska J.X., Yang Y.
<Astron. Astrophys., 658, A77 (2022)>
=2022A&A...658A..77N 2022A&A...658A..77N (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Millimetric/submm sources
Keywords: galaxies: clusters: general - galaxies: halos -
galaxies: high-redshift - cosmic background radiation -
submillimeter: galaxies
Abstract:
We have been undertaking a systematic survey at 850µm based on a
sample of four prototypical z∼2-3 enormous Lyα nebulae (ELANe)
as well as their megaparsec-scale (Mpc-scale) environments to study
the physical connections between ELANe and their coeval dusty
submillimeter galaxies (SMGs). By analysing the SCUBA-2 data with
self-consistent Monte Carlo simulations to construct the number
counts, here, we report on the overabundance of 850µm-selected
submillimeter sources around all the four ELANe, by a factor of
3.6±0.6 (weighted average) compared to the blank fields. This
suggests that the excessive number of submillimeter sources are likely
to be part of the Mpc-scale environment around the ELANe,
corroborating the co-evolution scenario for SMGs and quasars; this is
a process which may be more commonly observed in the ELAN fields. If
the current form of the underlying count models continues toward the
fainter end, our results would suggest an excess of the 850µm
extragalactic background light by a factor of between 2-10, an
indication of significant background light fluctuations on the survey
scales. Finally, by assuming that all the excessive submillimeter
sources are associated with their corresponding ELAN environments, we
estimate the SFR densities of each ELAN field, as well as a weighted
average of ΣSFR=1200±300M☉/yr/Mpc3, consistent with
that found in the vicinity of other quasar systems or proto-clusters
at similar redshifts; in addition, it is a factor of about 300 greater
than the cosmic mean.
Description:
The dataset for the four ELAN fields studied in this work were
acquired with the Submillimetre Common-User Bolometer Array 2
(SCUBA-2) on the James Clerk Maxwell Telescope (JCMT) during flexible
observing in 2017 September 02,16,17,23,24, 2018 January 16-18,
February 12 and March 29 (programs ID: M17BP024, M18AP054) under good
weather conditions (τ225GHz≤0.06). For each target, the
observations covered a field-of-view of ~=13.7' in diameter using a
DAISY scanning pattern centered on each ELAN position. Each field was
scheduled with cycles (scans) of about 30 minutes, resulting in 3
hours (6 scans) for the MAMMOTH-1, the Slug and the Jackpot ELANe,
while in 2.7 hours (5 scans) for the Fabulous ELAN. Even though
SCUBA-2 acquires simultaneously data at 850 and 450um, here we focus
only on the dataset at longer wavelengths as the 450um dataset is not
deep enough to obtain proper number counts.
We provide the source catalogs for ≥4σ detection.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
taba1-4.dat 68 73 SCUBA-2 850um detected sources within the
assumed effective area around 4 ELAN fields
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Byte-by-byte Description of file: taba1-4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Field Table number (A1-A4) (1)
4- 19 A16 --- Name Source name
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 29 F4.1 s RAs Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs Declination (J2000)
43- 46 F4.1 --- S/N Signal-to-noise ration
48- 51 F4.1 mJy F850 Flux density at 850um
53- 55 F3.1 mJy e_F850 Error on flux density at 850um
57- 60 F4.1 mJy F850D Deboosted flux density at 850um
62- 64 F3.1 mJy e_F850D Error on Deboosted flux density at 850um
66- 68 F3.1 arcsec ePos Error on position
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Note (1): Fields as follows:
A1 = Slug
A2 = Jackpot
A3 = Fabulous
A4 = MAMMOTH-1
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Apr-2022