Stunning "First Look" image by @vrubinobs.bsky.social of the galaxy NGC 4261 + neighbours. The image sharpness and depth is amazing plus the ability to see the diffuse light, e.g. stellar umbrellas caused by galaxy interactions. #astronomy #extragalactic #AstroSci * noirlab.edu/public/image...

Optical images from the Dark Energy Survey (DES) are amazing, ... so much happening in the galaxy group. Exploring the sky never gets boring 🤩 #extragalactic #AstroSci #astronomy #galaxies

Two-time Olympic silver medallist Nicola Olyslagers reveals how she has avoided a dip in motivation, as she targets winning the high jump at this year's World Athletics Championships in Tokyo.

Nicola Olyslagers defends her indoor high jump world championship, with fellow Australian Eleanor Patterson second in Nanjing, China.

GOLD and SILVER!! Australia’s Nicola Olyslagers has won a second straight high jump Indoor World Championships Title, while Eleanor Patterson made it an Aussie 1,2 to win silver. Both cleared 1.97m, but Olyslagers’ flawless jumps at earlier heights saw her prevail.

Amazing world indoor high jump competition - some massive jumps by Nicola 🤩 Congratulations Nic No 1 🥇, Eleanor No 2 🥈and Yaroslava No 3 🥉 Bring on more High Jump 🔥🔥🔥 #athletics #highjump

Wow 😮 ... lots going on here. Stellar shells and tails around IC 3091, clearly a galaxy merger in progress. #astronomy #AstroSci #extragalactic

‘Ghosts of the radio universe’: astronomers have discovered a slew of faint circular objects #astronomy #radioastronomy #AstroSci theconversation.com/ghosts-of-th...

Cool science: A giant X-shaped galaxy with a monster black hole as its engine * theconversation.com/experts-solv... (from May 2020) #extragalactic #astronomy #radioastronomy

Who likes Giant Radio Galaxies (GRGs) ? Here my latest ASKAP collection (incl. two candidates), all larger than 1 Mpc with angular sizes >5 arcmin. It's a zoo !! Paper ready for submission, comments welcome. #radioastronomy #extragalactic #astronomy #galaxies

Cool science: "Discovery of a rare ‘polar ring galaxy’ wrapped in a huge ribbon of hydrogen" (from Sep 2023) #astronomy #extragalactic #radioastronomy #galaxies theconversation.com/astronomers-...

Nearby galaxy pair NGC 7682 (left) and NGC 7679 (right) in a cosmic dance. Optical colour-composite image from the Dark Energy Survey DES-DR10. #astronomy #extragalactic #galaxies

Another stunning image from the Dark Energy Survey (DES) DR10 release. This is NGC 4495 which is surrounded by numerous spokes and shells appearing like a faint but sharply defined halo. Looks like multiple "umbrellas" from galaxy merger events. #astronomy #extragalactic

Faint stellar tails / bridges / filaments in the NGC 128 galaxy group as revealed in the Dark Energy Survey (DES) DR10, overexposed here to highlight stars outside the galaxy disks. These galaxies are interacting, and NGC 128 is counter-rotating (Chung+ 2012). #astronomy #extragalactic

Three of the spiral galaxies shown are part of the famous Grus Quartet which is rich in neutral hydrogen gas (black and blue contours from ATCA and Parkes, respectively). Hydrogen bridges between galaxies as well as tidal tails highlight their interaction history.

Merry Christmas everyone :)

Santa on his way ... originally posted 10 yrs ago (wow !!), when we started the ATNF Daily Astronomy Picture (ADAP) * www.atnf.csiro.au/daily-pictur... #astronomy #radioastronomy #adap #xmas

Congrats Manisha Caleb, @elenchically.bsky.social @astromelow.bsky.social and many others 🤩 Great to see this ASKAP discovery being highlighted here ! #radioastronomy #astronomy

4/5 GALEX ultra-violet (UV) data show star formation (SF) in the disk of M83 as well as its outskirts. These types of large UV-disks are referred as XUV disks, where dense clumps of neutral hydrogen pinpoint SF in the disk outskirts. #astronomy #extragalactic #radioastronomy

René Magritte's "The Kiss" at the NSW Art Gallery - amazing exhibition, loved strolling the rooms and reading about the artist and his works * www.artgallery.nsw.gov.au/whats-on/exh... #bluesky

3/5 The hydrogen envelope of spiral galaxies typically extends well beyond their stellar disks. M83 is a great example of this as shown below. There is a lot happening in the outer HI disk, likely evidence of interactions with neighbours. #radioastronomy #extragalactic #astronomy #spiral #galaxies

2/5 Deep optical images of M83 (NGC 5236) by Robert Gendler (left) and David Malin (right, 1987) reveal the faint stellar light including a southern spur and northern stream. The latter is likely an accreted dwarf galaxy. * David Malin's image archive: images.datacentral.org.au/malin/DEEP/153

Keen to see the host galaxy of the MIGHTEE ORC ? Here it is, a massive elliptical that has grown so big by accretion and mergers. - Just published in @rasjournals.bsky.social ui.adsabs.harvard.edu/abs/2025MNRA... #radioastronomy #astronomy #extragalactic #orcs

Now published in MNRAS Letters @rasjournals.bsky.social - yeah :) ui.adsabs.harvard.edu/abs/2025MNRA... #radioastronomy #astronomy #extragalactic #orcs

M83 - stunning optical image of this nearby, spiral galaxy, also known as the Southern Pinwheel - apod.nasa.gov/apod/ap19062... * Processing & copyright: Robert Gendler www.robgendlerastropics.com #astronomy

M101 - such a beautiful spiral galaxy. Here a beautiful multi-wavelength collage created by my friend Angel Lopez-Sanchez. Note the huge extent of the HI 21-cm emission. #radioastronomy #galaxies #hydrogen

Sydney Opera House with the Moon emerging from behind (taken nearly three months ago) - special evening 🤩

@bot.astronomy.blue signup

The hydrogen disk of NGC 300 extends much beyond its bright stellar disk as is typical for spiral galaxies. The gas kinematics allow us to model the disk and determine its dark matter content. - For more info see the "Local Volume HI Survey" (LVHIS) pages: www.atnf.csiro.au/research/LVH...

One of my favourite galaxies: NGC 300, located in the nearby Sculptor Group. - Image Credit & Copyright: Daniel Stern apod.nasa.gov/apod/ap24120...

CSIRO's ASKAP radio telescope under the Milky Way (Image credit: CSIRO/A. Cherney) * www.csiro.au/en/research/... * my favourite telescope #radioastronomy #telescopes #MilkyWay

just for fun :)

And while not Joy Division, images of ORC 5 made it onto the CD cover of the California rock band ISOBAR * isobarmusic.com * yeah 😆 #radioastronomy #orcs #rockmuscic

ORC J0102-2450 (= ORC 5) in radio, optical and infrared * Figure 2 from my paper ui.adsabs.harvard.edu/abs/2021MNRA... * Merger driven shocks during the formation of the central host galaxy, a massive elliptical at z = 0.27 and brightest group member, are likely responsible for the radio shells.

Inspired by Craft's famous pulsar plot, I made my own (for an astronomy paper, published in 2020) using HI spectra of galaxies sorted by the velocity width :)

Radio images of the first three single ORCs (Norris et al. 2021, Koribalski et al. 2021) as shown by Dolag et al. (2023) * ui.adsabs.harvard.edu/abs/2023ApJ.... * who found ORC-like outwards moving merger shocks in his high-resolution MAGNETICUM simulations during the formation of massive galaxies.

The host elliptical galaxy of the MIGHTEE ORC (Norris et al. 2024, arxiv.org/pdf/2411.17311) shows clear signs of merger activity, which is a clue to its formation and likely cause of the radio shells. Regarding possible formation scenarios, ORCs being radio relics around groups is my favourite.

"MeerKAT discovery of a MIGHTEE Odd Radio Circle" by Ray Norris et al. (2024) * arxiv.org/pdf/2411.17311 * So good to add another ORC to this new class of peculiar objects. The central host is again a massive elliptical galaxy !!

... just for fun, ASKAP tessellation :)

The Corkscrew Galaxy - nearly 1 Mpc long, incl. those loopy filaments (likely from a head-on collision with a shock front in the A3627 cluster) * MNRAS paper with @sunmish.bsky.social @elenchically.bsky.social @tvern23.bsky.social et al. ui.adsabs.harvard.edu/abs/2024MNRA... #radioastronomy

Always on the look-out for more odd radio circles (ORCs). - Could they be outwards moving mergers shocks similar to cluster relics but around galaxy groups ? Such merger shocks occasionally happen during the formation of the massive elliptical galaxies in the ORC centres. Boom. #radioastronomy

An X-shaped radio galaxy !! Observed with ASKAP as part of the "Evolutionary Map of the Universe" (EMU) project. More info here: theconversation.com/experts-solv...

Four of the 36 ASKAP antennas in the outback. Lots has happened since this photo was taken over 10 years ago. All sky surveys are now producing massive amounts of data. Looking forward to many more discoveries 😁

One of my favourite training locations :)

I created the ATNF Daily Astronomy Picture in 2014, and it's still running with stories and pictures related to radio astronomy :) Check out the archive here: www.atnf.csiro.au/ATNF-DailyIm...

Saying "Hello" with flowers from my garden 😀