Sky & Telescope - February 2022 - 64

Imaging Strategy
star formation in the surrounding gas, visible as a sprinkling
of blue star clusters to the right of the filament.
A faint trace of nebulosity related to the otherwise invisible
southern jet is also noticeable as a small, red knot seen
at the 4 o'clock position about halfway between the galaxy's
core and the bottom right corner of the image. This is the
first visible-wavelength detection of the southern jet.
Also visible in the image are the complete inner and outer
shell structures of the galaxy's extended halo. These features
are stars left over from past mergers with other galaxies. In
addition, more than 700 cataloged globular clusters orbiting
Centaurus A also riddle the field.
In 2019 I acquired an additional 10 hours of exposures,
this time through a Hα filter. The updated image incorporates
the new data to highlight the emission structures triggered by
the relativistic jet from the central black hole. It also emphasizes
the many pinkish star-forming regions within the dark
dust lane crossing the center of the galaxy.
Besides the main subject, the image is littered with other
faint, remote galaxies, some at the limit of detectability.
Deep in the Antlia Galaxy Cluster
Following the success of my Centaurus A project, I turned my
attention to another fascinating subject well-placed in the
night sky from my location in New Zealand.
The Antlia Cluster (Abell S0636) is a galaxy group located
in the constellation Antlia. It forms part of the larger HydraCentaurus
Supercluster, some 133 million light-years distant.
This makes it the third-closest galaxy cluster to our Local
Group, after the Virgo and Fornax Clusters. Only a few images
exist of this cluster, and those taken with professional observatories
merely cover selected narrow portions of the field.
Over a span of 55 nights in 2015, I accumulated 152 hours
of data on this magnificent galaxy cluster. Imaging began on
January 1, 2015, when the cluster had reached an acceptable
altitude in the east, and then continued every clear night
through June until the cluster was too low in the west.
The finished result displays an ultra-faint veil of gas and
SO MANY GALAXIES Using the same meticulous approach as in his Centaurus A project, the author recorded this exceedingly deep photo of the
Antlia Galaxy Cluster. Total exposure time was 152 hours through LRGB and Hα filters.
64 FEBRUARY 2022 * SKY & TELESCOPE

Sky & Telescope - February 2022

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

Contents
Sky & Telescope - February 2022 - Cover1
Sky & Telescope - February 2022 - Cover2
Sky & Telescope - February 2022 - 1
Sky & Telescope - February 2022 - Contents
Sky & Telescope - February 2022 - 3
Sky & Telescope - February 2022 - 4
Sky & Telescope - February 2022 - 5
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Sky & Telescope - February 2022 - 7
Sky & Telescope - February 2022 - 8
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Sky & Telescope - February 2022 - Cover3
Sky & Telescope - February 2022 - Cover4
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