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Hubble Visits Glittering Cluster, Capturing Its Ultraviolet Light https://science.nasa.gov/missions/hubble/hubble-visits-glittering-cluster-capturing-its-ultraviolet-light/ #NASA #Astrophysics #AstrophysicsDivision #GlobularClusters #GoddardSpaceFlightCenter #HubbleSpaceTelescope #StarClusters #Stars #TheUniverse

It’s Saturday morning again and time to post an update of activity at the Open Journal of Astrophysics. As last week there are six papers to announce, bringing the count in Volume 7 (2024) up to 93 and the total altogether up to 208.

In chronological order, the six papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.

First one up, published on Monday 14th October 2024, is in the folder marked Cosmology and NonGalactic Astrophysics and is called “Backreaction in Numerical Relativity: Averaging on Newtonian gauge-like hypersurfaces in Einstein Toolkit cosmological simulations“. This paper presents a numerical study of the effect of local inhomogeneities on the dynamical evolution of the Universe, i.e. the so-called “backreaction” problem; the authors are Alexander Oestreicher and Sofie Marie Koksbang of the University of Southern Denmark, Odense, Denmark.

Here is a screen grab of the overlay, which includes the abstract:

You can find the officially accepted version of the paper on the arXiv here.

The second paper to announce, published on 15th October 2024, is “Weak-Lensing Shear-Selected Galaxy Clusters from the Hyper Suprime-Cam Subaru Strategic Program: II. Cosmological Constraints from the Cluster Abundance” by I-Non Chiu (National Cheng Kung University, Taiwan) and 11 others based in Taiwan, Japan, India and the USA. This paper, which is also in the folder Cosmology and NonGalactic Astrophysics presents constraints on cosmological parameters obtained from a sample of galaxy clusters

You can see the overlay here:

The accepted version of this paper can be found on the arXiv here.

The third paper is “Image formation near hyperbolic umbilic in strong gravitational lensing” by Ashish Kumar Meena (Ben Gurion University, Israel) and Jasjeet Singh Bagla (IISER Mohali, India). It presents a detailed theoretical discussion of a particular form of strong gravitational lensing and its observational consequences; it is in the folder Astrophysics of Galaxies and was published on October 15th 2024.

The overlay is here:

The officially accepted version can be found on arXiv here.

The fourth paper, published on 16th October 2024 and in the folder Astrophysics of Galaxies, is “Weak Gravitational Lensing around Low Surface Brightness Galaxies in the DES Year 3 Data” by N. Chicoine (University of Chicago, USA) et al. (105 authors; DES Collaboration). It presents a demonstration of the viability of using weak gravitational lensing to constrain the halo masses of low surface brightness galaxies.

The overlay is here

You can find the officially accepted version of this paper here.

The fifth paper in this batch is “Imprints of interaction processes in the globular cluster system of NGC 3640” by Ana I Ennis (Waterloo, Canada) and Juan Pablo Caso & Lilia Patricia Bassino (Instituto de Astrofísica de La Plata, Argentina). This one was also published on 16th October 2024 and is in the folder Astrophysics of Galaxies, Here is the overlay

You can find the official accepted version on the arXiv here.

Finally for this week we have “On the nature of the C IV-bearing circumgalactic medium at 𝒛∼𝟏” by Suyash Kumar, Hsiao-Wen Chen, Zhijie Qu & Mandy C. Chen (U. Chicago), Fakhri S. Zahedy (U. North Texas), Sean D. Johnson (Carnegie Observatories), Sowgat Muzahid (IUCAA, India) and Sebastiano Cantalupo (U. Milan Bicocca)

The overlay is here

You can find the officially-accepted version on arXiv here.

That’s it for now. More next week!

https://telescoper.blog/2024/10/19/six-new-publications-at-the-open-journal-of-astrophysics-2/

#240719081v2 #arXiv240300065v2 #arXiv240516826v2 #arXiv240611970v2 #arXiv240803049v1 #arXiv240815824v2 #AstrophysicsOfGalaxies #Backreaction #CarbonIVAbsorbers #CosmologyAndNonGalacticAstrophysics #DarkEnergySurvey #DES #EinsteinToolkit #galaxyClusters #globularClusters #NGC3640 #NumericalRelativity #strongGravitationalLensing #weakGravitationalLensing

Mystery in the Stars: Hubble Unveils Omega Centauri’s Hidden Monster
https://scitechdaily.com/mystery-in-the-stars-hubble-unveils-omega-centauris-hidden-monster/ #astronomy #OmegaCentauri #BlackHole #IMBHs #GlobularClusters

*** SCIENCE GOODIE*** 📡

A few weeks back wrote an article about the news of the Intermediate-Mass Black Hole inferred at the centre of Omega Cent. and wrote how we can use millisecond pulsars to really zone in on it.

https://www.spaceaustralia.com/news/omega-centurais-monster-black-hole

Well, a team did this & say it might NOT be an IMBH!

https://arxiv.org/abs/2408.00939

This is very cool and I hope it evolves into a fun, science battle!

📷 ESO

#Astrodon #GlobularClusters #SpaceAustralia #BlackHoles

A dense star field of mostly smaller orange and white stars with blue stars and red stars peppered across the image

MOAR YOU SAY?! 📡

10 new millisecond pulsars found in Terzan 5 Globular Cluster using MeerKAT + Greenbank archival data.

Highlights include an eccentric, wide-orbit, extremely fast-spinning pulsar in a binary neutron star system.

Terzan 5, like its bigger cousin Omega Cent, has two main populations of stars. Both clusters might potentially be the former cores of dwarf galaxies that have been chewed up by the Milky Way.

Terzan 5 now has the largest number of millisecond pulsars of any globular cluster with a whopping 49!

Curiously, Omega Cen - which is many times more massive than Terzan 5 only has 18 discovered MSPs so far. We think it's because the core of Omega Cen is less densely populated so less chance of dynamic binary interactions to kick start pulsar --> MSP evolution.

I wonder if Terzan 5 has an IMBH?!?!

https://www.aanda.org/articles/aa/full_html/2024/06/aa49303-24/aa49303-24.html

📷 ESA/Hubble/ESO VLT/KECK/F. Ferraro

#GlobularClusters #Astrodon #RadioAstronomy #Pulsars

A giant, bedazzling jewel-like structure. The globular cluster is a collection of stars that are orbiting a common centre of gravity. This gives the cluster a spherical appearance. The many stars are densly packed in the core region and drop in density radially. The collection of stars is mostly white and yellow, but a few bright blue and red stars are also peppered around the cluster.

Astronomers: Omega Centauri - a massive globular cluster orbiting our Galaxy - likely has a 20,000 solar mass black hole in its core.

The globular cluster, which contains approx. 10 million stars is thought to be the remnant core of a former dwarf galaxy, now cannibalised by the Milky Way.

These new findings might provide the 'missing link' between stellar-mass black holes and supermassive black holes.

I had a chat with The University of Queensland Dr Holger Baumgardt who played a direct role in providing the theoretical modelling and investigations into the stellar velocities around the monster black hole. My latest for #SpaceAustralia

https://www.spaceaustralia.com/news/omega-centurais-monster-black-hole

📷 ESO / ESA/Hubble & NASA, M. Häberle (MPIA)

#GlobularClusters #BlackHoles #Astronomy #Astrodon #Astrophysics

a bright, ball of stars, collected together centrally. The cluster of stars features mostly white stars but there are numerous blue and red stars also. The density of stars is highest at the centre, and drops radially, giving the perspective of a hive-like structure swarming with points of light.

IMBH Candidate in Omega Centauri ✨

#BlackHoles #GlobularClusters

⏩ 3 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=3&user=OptimusPrimeBot&ilshowall=1&offset=20240711091050

IMBH_Candidate_in_Omega_Centauri_(2024-015).png

#Simulations demonstrate potential mechanisms of #intermediatemassblackhole formation in #globularclusters

https://phys.org/news/2024-05-simulations-potential-mechanisms-intermediate-mass.html?utm_source=nwletter&utm_medium=email&utm_campaign=daily-nwletter

The Milky Way’s Smallest, Faintest Satellite Galaxy Found https://www.universetoday.com/166388/the-milky-ways-smallest-faintest-satellite-galaxy-found/ #satellitegalaxies #globularclusters #darkmatterhalo #dwarfgalaxies #darkmatter #astronomy #lambdacdm #galaxies #milkyway

It's been a few months since I've done some proper science writing for #SpaceAustralia (Phd Lyfe) but thought this new paper drop was interesting to write about!

Australian astronomers have used radio waves to look deep into the heart of the Globular Cluster 47 Tucanae & found an undiscovered radio source.

The newly found radio source could potentially be the first evidence of an intermediate-mass black hole in the core of a Globular Cluster, or a pulsar that is real close to the centre.

Both cases = good science labs for us!!!

https://www.spaceaustralia.com/news/radio-source-heart-47-tuc

📸 Paduano et al & NASA/ESA Hubble

#Astrophysics #Astrodon #Science #RadioAstronomy #GlobularClusters #Pulsars #BlackHoles

A patchy, abstract image of purple blobs on a black background. Some of the purple blobs are red and bright orange. This image resembles a heat map. The purple blobs are caused by radio signals and the brighter, red and orange sources are more brighter radio signals. There is a large red circle annotated showing the core region of the cluster and a small, central red blob is also annotated with a square to highlight the central radio source within the cluster.

Astrophotograph of a very dense star field with the central core region of the image showing a collection of white, bright stars in spherical configuration.

Very neat follow-up study of the radio detections of millisecond pulsars in the Omega Centauri core, with CHANDRA, finding correlation between spider pulsar companion mass and X-ray luminosity.

The redbacks give off more X-rays!

Omega Cent. is a super interesting Globular Cluster to study with pulsars, as it is so much more massive than other Milky Way GCs. Some folks think it is the remnant component of a former, now cannibalised galaxy - which makes probing the dynamics and binary configurations in the core interesting!

arxiv.org/abs/2309.13189

📸 NASA/CXC/SAO/ESA/STScI/AURA/N. Wolk

#Pulsars #GlobularClusters #Astrophysics #Astrodon

An extremely dense star field. Annotated on the field is a large circle, showing the core region of this globular cluster. Other annotations are smaller circles with letters near them, indicating the location of the spider pulsars.

✨ 3 new pictures from Hubble (NASA)
- Terzan 12
- Terzan 12 Compass Image
- Terzan 12 Context Image

#GlobularClusters #StarClusters #Stars

⏩ https://commons.wikimedia.org/wiki/Special:ListFiles?limit=5&user=OptimusPrimeBot&ilshowall=1&offset=20230908093150

What Created Globular Clusters Around the Universe? New JWST Findings - YouTube
https://www.youtube.com/watch?v=vOQ55Fw9s3U

#Astronomy #Cosmology #JamesWebbTelescope #GlobularClusters

Possible #firstevidence for #supermassivestars at the origin of #globularclusters

https://phys.org/news/2023-05-evidence-supermassive-stars-globular-clusters.html

Referenced link: https://phys.org/news/2023-05-evidence-supermassive-stars-globular-clusters.html
Discuss on https://discu.eu/q/https://phys.org/news/2023-05-evidence-supermassive-stars-globular-clusters.html

Originally posted by Phys.org / @physorg_com: http://nitter.platypush.tech/physorg_com/status/1656702932136370177#m

Possible first evidence for #supermassivestars at the origin of #globularclusters @UNIGEnews @AandA_journal https://www.aanda.org/articles/aa/full_html/2023/05/aa46410-23/aa46410-23.html https://phys.org/news/2023-05-evidence-supermassive-stars-globular-clusters.html

I forgot to post about it when it appeared on arXiv, but the newest MUSE-GC paper is now public at A&A: Martens et al. (2023A&A...671A.106M) https://doi.org/10.1051/0004-6361/202244787 #musevlt #GlobularClusters

Fig. 4. Distributions of samples of (v/sigma)_HL, which describe the rotation strength for each cluster in this analysis. These distributions are shown for the overall cluster (gray) and each of its populations (P1:green, P2:orange, P3:violet). The 16th, 50th, and 84th percentile for each distribution are
shown on top of the corresponding distribution. For distributions that peak at zero, only the 95th percentile is shown, to provide an upper limit on the rotation strength.

#Introduction 👋🏻 #Astrodon 🌟

I’m Laura. I’m an #ESA-#AURA astronomer at @spacetelescope.

I’m one of two deputy heads of the #ScienceMissionOffice, where I work on #SciencePolicies for our observatories and on science infrastructure for our staff.

For research, I study the #Kinematics and #Dynamics of small stellar systems using #ProperMotions from #HST, #Gaia, and soon #JWST. I have a particular fondness for #GlobularClusters but also study #DwarfGalaxies and #SatelliteSystems of larger hosts.

This is my digital painting "Cluster of clusters", a tentative but interesting attempt to bring my idea of a dark galaxy with stars only in its halo globular clusters to life.

#art #MastoArt #digitalart #krita #digitalpainting #painting #spaceart #stars #starclusters #globularclusters

#globularClusters

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