Sky & Telescope - April 2022 - 58

APRIL 2022 OBSERVING
Going Deep
NGC 3346
Quasar 1
Quasar 8
Quasar 5
52
Quasar 6
NGC 3377
NGC 3367
NGC 3338
tify a massive entity that they named
the Sloan Great Wall. At 1.4 billion
light-years in length, it was two times
larger than the Great Wall, which
pushed the limits of ΛCDM theory.
Since then other Great Walls of galaxies,
LQGs, as well as gamma-ray bursts
are outlining what are, if the data confirm
them, structures up to 10 billion
Faraway Quasars
Object
SDSS J104520.62+141724.2
SDSS J104604.05+140241.2
SDSS J104624.25+143009.1
SDSS J104139.15+143530.2
light-years in diameter. The trouble is
that none of these should exist.
In 2010, another team of astronomers
published limits for entities compatible
with the then-current understanding
of ΛCDM: Their length should
be less than 1.2 billion light-years. The
Sloan Great Wall mildly exceeds this
(though not in volume), and theorists
scrambled to fit it into their constructs.
If it had been the single largest structure
in the universe - and just happened
to be in our cosmic backyard -
the theory may have been safe.
But in 2013 Clowes and his colleagues
Number Mag(v)
18.5
5
6
8
1
18.9
19.0
18.2
Light travel
time (Gyr)
8.9
8.9
9.2
8.7
RA
Dec.
10h 45.3m +14° 17′
10h 46.1m +14° 03′
10h 46.4m +14° 30′
10h 41.7m +14° 36′
The quasar numbers refer to the position in the table in the Clowes et al. paper (published in Monthly
Notices of the Royal Astronomical Society in 2013). Right ascension and declination are for equinox 2000.0.
announced the discovery of what they
dubbed the Huge-LQG, a collection of
73 quasars clustered at a mean redshift
of 1.27 that stretches 20° by 10°
across Leo. At four billion light-years in
its longest dimension, this group was
three times too large to fit into standard
cosmology models, and some scientists
wondered if it disproved the cosmological
principle. For context, the 3.4 × 1018
solar masses contained in the Huge-LQG
are equivalent in mass to 1,300 Coma
Clusters or 20 Sloan Great Walls. Sifted
from the Sloan database of 105,000 quasars,
it may be the largest LQG (the SDSS
sampled only one quarter of the sky).
58 APRIL 2022 * SKY & TELESCOPE
POSS-II / STSCI / CALTECH / PALOMAR OBSERVATORY

Sky & Telescope - April 2022

Table of Contents for the Digital Edition of Sky & Telescope - April 2022

Contents
Sky & Telescope - April 2022 - Cover1
Sky & Telescope - April 2022 - Cover2
Sky & Telescope - April 2022 - 1
Sky & Telescope - April 2022 - Contents
Sky & Telescope - April 2022 - 3
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