Follow us on Bluesky
  1. Bluesky Feeds /
  2. Emily Hunt /
  3. Extragalactic Astronomy
Extragalactic Astronomy

Extragalactic Astronomy

by Emily Hunt Emily Hunt

A science-oriented feed about extragalactic astronomy! Part of the Astronomy feeds network. Astronomers can sign up to post here via @bot.astronomy.blue Contains posts from signed up users with #extragalactic. Posts here are also included in the main Astronomy feed.

Feed on Bluesky

Feeds Stats

  • 💙 Liked by 251 users
  • 📅 Updated about 2 months ago
  • ⚙️ Provider feed-all.astronomy.blue

Extragalactic Astronomy Likes over time

Like count prediction
The feed Extragalactic Astronomy gains approximately 11 likes per month.

Feed Preview for Extragalactic Astronomy

Astronomy Feeds News
@astronomy.blue
9 months ago
📌 Welcome to the Astronomy feeds 📌 The feeds are a network of astronomy & astrophysics posts by a curated list of professional, amateur, and student astronomers. Want to post here? Tag our friendly bot in a post with the command "signup", like this: @bot.astronomy.blue signup
213
169
3175
Nereide
@drnereide.bsky.social
7 days ago
🧵 This intriguing image shows two distant interacting galaxies, collectively called Arp 142, resembling a penguin guarding an egg. The image combines data from NASA's Spitzer (infrared light) and Hubble (visible light) telescopes. ➡️ www.spitzer.caltech.edu/image/ssc201... 🔭 🧪 #extragalactic
The image shows two distant interacting galaxies, collectively called Arp 142, resembling a penguin guarding an egg. The "penguin" galaxy, NGC 2936, has a distorted spiral shape with bluish filaments of newly-formed hot stars and red filaments of gas and dust. The "egg" galaxy, NGC 2937, appears nearly featureless with a greenish glow from older stars and no red dust features. A blue streak of an unrelated background galaxy is visible at the top. The galaxies are set against a dark cosmic background.
32
231
1614
Nereide
@drnereide.bsky.social
9 days ago
🧵 This ethereal beauty image, taken by JWST's Mid-Infrared Instrument (MIRI), showcases NGC 346, a young open star cluster with the associated nebula located some 200,000 ly away in the nearby Small Magellanic Cloud (SMC). ➡️ esa.int/ESA_Multimed... 🔭 🧪 #extragalactic #stellarastro #Webb #JWST
The image shows an ethereal celestial landscape with arcs of bluish material forming a boat-like structure at the bottom. One arc extends upwards to the right, the other downwards to the left. From the center, a plume of blue filaments stretches upward to the left, evoking the mast of a sailboat. Translucent pink curtains envelop much of the image, overlapping the shape of the boat. Stars are sparse: a few bright pink spots with six short diffraction beams punctuate the blue filaments, while faint blue dots, distant stars, are scattered across a black or dark gray background. #JWST #Webb
4
29
203
Nereide
@drnereide.bsky.social
13 days ago
2/ The research, done with the MATISSE instrument, combined infrared light from 4 European Very Large Telescopes in Chile. The torus of cosmic dust is hiding the SMBH at the centre of galaxy Messier 77, also known as NGC 1068. Press Release: www.eso.org/public/unite... 🔭 🧪 #extragalactic
Supermassive black hole caught hiding in a ring of cosmic dust

www.eso.org

Supermassive black hole caught hiding in a ring of cosmic dust

The European Southern Observatory’s Very Large Telescope Interferometer (ESO’s VLTI) has observed a cloud of cosmic dust at the centre of the galaxy Messier 77 that is hiding a supermassive black hole...
3
5
22
Nereide
@drnereide.bsky.social
13 days ago
🧵 A research team led by Violeta G. Rosas (@unileiden.bsky.social) captured, with high-resolution infrared imaging, the torus of dust surrounding a quasar — a very luminous SMBH that accretes matter from its surroundings. Research Paper➡️ arxiv.org/abs/2112.13694 🔭 🧪 #extragalactic #cosmology
ESO's VLT image features a magnificent face-on view of the barred spiral galaxy Messier 77. The image highlights the galaxy's beauty, showcasing its glittering arms criss-crossed with dust lanes, without masking Messier 77's turbulent nature." Credit: ESO https://www.eso.org/public/unitedkingdom/images/eso1720a/
4
19
99
Nereide
@drnereide.bsky.social
15 days ago
This splendid, new image of the young star cluster NGC 346 is part of the celebrations for the 35th anniversary of Hubble. Credits: ESA/Hubble & NASA, A. Nota, P. Massey, E. Sabbi, C. Murray, M. Zamani (ESA/Hubble) science.nasa.gov/missions/hub... 🔭 🧪 #stellarastro #cosmology #HST #extragalactic
This Hubble image shows a young star cluster, NGC 346, in the Small Magellanic Cloud. It is dominated by a bright pink nebula, illuminated by massive stars that emit a deep blue light. Snakelike dark clouds weave through the nebula, creating a sculpted bubble effect. The scene is vibrant, with contrasts between pink, blue, and black.
2
27
126
John Stott
@jpsastro.bsky.social
20 days ago
However if you only have the low res version of the Bruzual and Charlot 2003 models 🧪🔭 #extragalactic
FTSE 100 index flipped to look like a galaxy spectrum (quoting a post below I forgot to use alt text for that was the S&P500 in the same manner)

Check out 4000A break on this elliptical galaxy 🧪🔭 #extragalactic

0
2
17
Nereide
@drnereide.bsky.social
20 days ago
2/2 Initially identified as a single quasar in the Sloan Digital Sky Survey (SDSS), J0749+2255 was later flagged as a candidate dual quasar with the VODKA technique based on Gaia data. More at my post➡️ www.tutto-scienze.org/2025/04/cosm... 🔭 🧪 #cosmology #extragalactic #JWST #quasars
Cosmic Dance: A Dual Quasar Or A Single Lensed Quasar At Cosmic Noon?

www.tutto-scienze.org

Cosmic Dance: A Dual Quasar Or A Single Lensed Quasar At Cosmic Noon?

A recent study has presented JWST observations of an object called J0749+2255, a candidate dual quasar very far from us at a redshift of 2.1...
1
5
28
Nereide
@drnereide.bsky.social
20 days ago
🧵 1/2 A recent study has presented JWST observations of an object called J0749+2255, a candidate dual quasar very far from us at a redshift of 2.17 (which means it is distant 10.661 billion light-years ). Image Source➡️ science.nasa.gov/asset/hubble... 🔭 🧪 #cosmology #extragalactic #JWST #quasars
The image of the dual quasar J0749+2255, captured by the HST, shows two bright quasars, dating back to when the universe was only 3 billion years old. The quasars appear as two white spots of light, very close together. Around them, the background is dark, with some reddish hues and faint distorted arcs. The quasars dominate visually, emitting intense light from the supermassive black holes that power them. There is no stellar detail or bright coloration beyond the faded whites and reds.
2
12
88
John Stott
@jpsastro.bsky.social
21 days ago
Check out 4000A break on this elliptical galaxy 🧪🔭 #extragalactic
3
8
72
John Stott
@jpsastro.bsky.social
21 days ago
Incidentally, here’s an old galaxy #cosmology #extragalactic 🔭🧪
Image of giant elliptical galaxy m87
1
2
14
John Stott
@jpsastro.bsky.social
21 days ago
We’re doing ‘oldest’ again. #extragalactic #cosmology 🧪🔭

#PPOD: GLASS-z12 (formerly GLASS-z13) is one of the oldest galaxies ever seen, dating back to 350 million years after the Big Bang. It was discovered in data collected by NIRCam on NASA's JWST in 2022. Credit: NASA/STScI/GLASS-JWST program: R. Naidu, G. Brammer, T. Treu 🧪 🔭

A red blob of light, glowing lighter near the center, is shown against the black of deep, deep space.
1
3
21
Nereide
@drnereide.bsky.social
21 days ago
🧵 1/6 This fantastic composite, depicting the double star cluster NGC 1850, is one of the images released to commemorate the 25th anniversary of Chandra X-Ray Observatory. ➡️ chandra.cfa.harvard.edu/photo/2024/2... NGC 1850 is rather unusual as no other objects 🔭 🧪 #extragalactic #stellarastro
"This composite image features a double star cluster, a blue-tinted cloud, and several neon purple dots. The bright, golden stars in the larger cluster fill the upper center of the image. The other cluster is much smaller and coincides with one of the neon purple circles located slightly above and to the right of the image’s center. This and the other purple circles are X-ray sources detected with Chandra. To our left of the combined cluster is a vertical streak of blue-tinted cloud. Extending beyond the upper and lower edges of the image, this section of cloud resembles wafting smoke from a cigarette."
4
36
209
Romain Meyer
@astrorameyer.bsky.social
26 days ago
🧵 Today is paper day for me! Usually I don’t post about papers but I have a special soft spot for this one: the detection of the Gunn-Peterson trough in high-redshift *galaxies* !! arxiv.org/abs/2504.02683 #astrosci #extragalactic #cosmology
1
4
24
Nereide
@drnereide.bsky.social
27 days ago
🧵 For people who missed it, there is a #JWST recent image depicting a rare and fascinating astronomical phenomenon: an Einstein ring. ➡️ esawebb.org/images/potm2... The spectacular image shows two distant galaxies, which at first glance look like a single galaxy 🔭 🧪 #extragalactic #cosmology
The image is visually striking. At the centre is the elliptical galaxy, visible as an oval glow with a small, bright nucleus, surrounded by a smooth halo. A ring of light, appearing as a broad, distorted band, surrounds this galaxy: this is the background spiral galaxy, distorted by gravitational lensing. The ring shows bright blue hues, where the spiral arms have been stretched into circles, with details of star clusters and gaseous structures still discernible despite the distortion. The background is black, dotted with a few distant objects, which accentuate the contrast with the ring and the central galaxy. The overall effect is that of a “cosmic eye”, an image that captures the imagination and bears witness to the complexity of the universe.
9
54
289
Nereide
@drnereide.bsky.social
29 days ago
1/2 An international team using ALMA detected high-resolution radio signals from warm gas surrounding a supermassive #blackhole (SMBH), dating back about 13 billion years, when the Universe was very young. Image Credit: ALMA (ESO/NAOJ/NRAO), K. Tadaki et al. 🔭 🧪 #extragalactic #cosmology
This illustration shows how intense X-ray radiation from the vicinity of a supermassive black hole heats the surrounding gas. When viewed from the side, visible light and X-rays are blocked by the disk, effectively hiding the SMBH.
1
4
38
Nereide
@drnereide.bsky.social
30 days ago
The active galactic nucleus (AGN) of the galaxy NGC 4941 is powered by a supermassive black hole that significantly affects its surroundings. This splendid #Hubble image highlights both the beauty of the spiral structure and the dynamic activity of the nucleus. 🔭 🧪 #extragalactic #cosmology

This image features a spiral galaxy with great feedback – feedback from its young stars and active galactic nucleus, that is! Read more about these observations from the NASA/ESA Hubble Space Telescope 👉 esahubble.org/images/potw2... 🔭 🧪

A spiral galaxy seen at a diagonal angle. Its very centre is a bright white glowing orb, surrounded by an inner disc of golden light. This is wrapped in a broad outer disc that glows more dimly, with patchy, broken spiral arms swirling around it, filled with small blue and pink star clusters. Dark reddish threads of dust also spiral through the disc, with some strands reaching into the core.
0
7
35
John Stott
@jpsastro.bsky.social
about 1 month ago
🔭 #extragalactic #cosmology

Abstract submissions for NAM 2025 close tomorrow at 1pm! Make sure to submit your abstracts for a talk or poster as this is the final deadline! Submit your abstracts here: conference.astro.dur.ac.uk/event/7/abst... @royalastrosoc.bsky.social

0
4
7
Alessandro Peca
@xpecax.bsky.social
about 1 month ago
Just made our X-ray luminosity function from Peca+23 available as an interactive online tool via Binder — no installation or download needed! Full repo and Binder link: github.com/alessandrope... #extragalactic
GitHub - alessandropeca/S82X

github.com

GitHub - alessandropeca/S82X

Contribute to alessandropeca/S82X development by creating an account on GitHub.
0
2
9
Nereide
@drnereide.bsky.social
about 1 month ago
1/ A 2024 paper announced the discovery of the two most distant galaxies ever observed. The more distant of them, Jades-Gs-z14-0, has a redshift = 14.32 (+0.08/-0.20) which, translated into cosmic epochs, means just 290 Myr after the Big Bang. ➡️ www.nature.com/articles/s41... 🔭 🧪 #extragalactic
The image features the sky around JADES-GS-z14-0 and JADES-z14-1. False color red/green/blue image of the JADES imaging field 7 (background) and false color red/green/blue thumbnail images of the two z ∼ 14 galaxies. The green outline illustrates the four quadrants of the NIRSpec microshutter array of the Cycle 1 NIRSpc 1287 program.
3
17
63
John F Wu
@jwuphysics.bsky.social
about 1 month ago
Somebody liked one of these posts from 18 months ago, and I realized that there might be a resurgence in interest in our DESI LOWZ secondary targets survey, given the new DESI DR1 and results. #extragalactic ☄️🧪⚛️🔭

Our DESI LOW-Z Survey paper is now published! 🔭 In summary, we select very low-redshift galaxies (z<0.03 or D<130 Mpc) using simple photometric cuts and cutting-edge convolutional neural networks (CNNs). Through DESI spectroscopic followup, we find that the CNN can efficiently find low-z galaxies!

iopscience.iop.org
1
1
23
Nereide
@drnereide.bsky.social
about 1 month ago
This incredible composite image by multiple observatories (including Hubble, Chandra, Webb) shows NGC 346, a young open star cluster with the associated nebula. It is located some 200,000 ly away in the nearby Image source and credit➡️ chandra.si.edu/photo/2023/c... 🔭 🧪 #extragalactic 🧵 1/
"The image shows the NGC 346 star cluster. Here, thousands of specks of light blanket the blackness of space. A ribbon of thick orange cloud runs along the bottom edge of the image, rounds our lower right corner, and streaks up the right side. A similar patch of roiling orange cloud can be found near our upper left. Between these gas plumes, centered near the top of the image, the star cluster is densely packed with specks of white, blue, and purple light. At our left, a large, bright white, gleaming dot is surrounded by purple mist. This is a hot, young, massive star, sending powerful winds outward from its surface. A patch of smaller dots, other young stars, can be found inside a faint purple mist near the center of the image."
5
23
81
John F Wu
@jwuphysics.bsky.social
about 1 month ago
A funky source seen by Euclid in Vis + Y band. What is going on here? ☄️ #extragalactic (This is part of Mike Walmsley et al.'s GalaxyZoo dataset; all credit to them!)
Weird Euclid source shown in Vis + Y band false color imaging. There's two nuclear regions and a funny loop shape.
7
8
54
John F Wu
@jwuphysics.bsky.social
about 1 month ago
☄️ #extragalactic
0
0
8
Bärbel Koribalski
@bskoribalski.bsky.social
about 1 month ago
Wow 😮 ... lots going on here. Stellar shells and tails around IC 3091, clearly a galaxy merger in progress. #astronomy #AstroSci #extragalactic
1
3
19