Christopher Harvey-Hawes
@chrisharhaw.bsky.social
PhD Student at the University of Canterbury, NZ
Cosmology, Astrophysics and Gravitational Lensing
Cosmology, Astrophysics and Gravitational Lensing
Reposted by Christopher Harvey-Hawes
#APOD Astronomy Picture of the Day
SN Encore: A Second Supernova Seen Several Times
Credits: NASA, ESA, CSA, STScI, J. Pierel (STScI) & A. Newman (Carnegie Inst. for Science) 🧪🔭
www.star.ucl.ac.uk/~apod/apod/a...
SN Encore: A Second Supernova Seen Several Times
Credits: NASA, ESA, CSA, STScI, J. Pierel (STScI) & A. Newman (Carnegie Inst. for Science) 🧪🔭
www.star.ucl.ac.uk/~apod/apod/a...
October 7, 2025 at 1:34 PM
#APOD Astronomy Picture of the Day
SN Encore: A Second Supernova Seen Several Times
Credits: NASA, ESA, CSA, STScI, J. Pierel (STScI) & A. Newman (Carnegie Inst. for Science) 🧪🔭
www.star.ucl.ac.uk/~apod/apod/a...
SN Encore: A Second Supernova Seen Several Times
Credits: NASA, ESA, CSA, STScI, J. Pierel (STScI) & A. Newman (Carnegie Inst. for Science) 🧪🔭
www.star.ucl.ac.uk/~apod/apod/a...
Reposted by Christopher Harvey-Hawes
New Publication at the Open Journal of Astrophysics: "The matter with(in) CPL" by Leonardo Giani (U. Queensland, Australia), Rodrigo Von Marttens (Universidade Federal da Bahia, Brazil) and Oliver Fabio Piattella (Universita degli Studi dell’Insubria, Italy)
doi.org/10.33232/001...
doi.org/10.33232/001...
The matter with(in) CPL | Published in The Open Journal of Astrophysics
By Leonardo Giani, Rodrigo Von Marttens & 1 more. A new parameterization of the standard model and its implications for the interpretation of cosmological observations.
doi.org
July 29, 2025 at 8:13 AM
New Publication at the Open Journal of Astrophysics: "The matter with(in) CPL" by Leonardo Giani (U. Queensland, Australia), Rodrigo Von Marttens (Universidade Federal da Bahia, Brazil) and Oliver Fabio Piattella (Universita degli Studi dell’Insubria, Italy)
doi.org/10.33232/001...
doi.org/10.33232/001...
Reposted by Christopher Harvey-Hawes
How about some lunchtime lensing? 🥪🔎
A team based at @ox.ac.uk , Portsmouth and @newcastleuni.bsky.social universities combined the power of citizen scientists and AI to sift through the more than one million galaxies seen in Euclid’s latest data, searching for strong gravitational lenses... (1/4)
A team based at @ox.ac.uk , Portsmouth and @newcastleuni.bsky.social universities combined the power of citizen scientists and AI to sift through the more than one million galaxies seen in Euclid’s latest data, searching for strong gravitational lenses... (1/4)
March 21, 2025 at 11:36 AM
How about some lunchtime lensing? 🥪🔎
A team based at @ox.ac.uk , Portsmouth and @newcastleuni.bsky.social universities combined the power of citizen scientists and AI to sift through the more than one million galaxies seen in Euclid’s latest data, searching for strong gravitational lenses... (1/4)
A team based at @ox.ac.uk , Portsmouth and @newcastleuni.bsky.social universities combined the power of citizen scientists and AI to sift through the more than one million galaxies seen in Euclid’s latest data, searching for strong gravitational lenses... (1/4)
Just my luck that as soon as I finish my thesis intro, then DES, DESI, Euclid + more release a seemingly endless list of papers 😅 #cosmolgy
March 20, 2025 at 8:26 PM
Just my luck that as soon as I finish my thesis intro, then DES, DESI, Euclid + more release a seemingly endless list of papers 😅 #cosmolgy
Reposted by Christopher Harvey-Hawes
🔊 New BAO analysis from the 3-year observations (DR2). Long story short, as follows.
1. DESI alone is consistent with LCDM. 👉 Boring
2. DESI and Planck have a 2.3 discrepancy in Ωm-H0rd plane. 👉Interesting.
1. DESI alone is consistent with LCDM. 👉 Boring
2. DESI and Planck have a 2.3 discrepancy in Ωm-H0rd plane. 👉Interesting.
March 20, 2025 at 1:12 AM
🔊 New BAO analysis from the 3-year observations (DR2). Long story short, as follows.
1. DESI alone is consistent with LCDM. 👉 Boring
2. DESI and Planck have a 2.3 discrepancy in Ωm-H0rd plane. 👉Interesting.
1. DESI alone is consistent with LCDM. 👉 Boring
2. DESI and Planck have a 2.3 discrepancy in Ωm-H0rd plane. 👉Interesting.
Reposted by Christopher Harvey-Hawes
Using #AI models & #CitizenScience contributions, another first catalogue of 500 galaxy-galaxy strong lens candidates is also released today, almost all of which were previously unknown. 8/
🔭🧪 #astrosci
🔭🧪 #astrosci
March 19, 2025 at 11:02 AM
Using #AI models & #CitizenScience contributions, another first catalogue of 500 galaxy-galaxy strong lens candidates is also released today, almost all of which were previously unknown. 8/
🔭🧪 #astrosci
🔭🧪 #astrosci
Reposted by Christopher Harvey-Hawes
Excellent paper by Tania Barone has this lovely image by PhD student Huimin Qu arxiv.org/abs/2503.08041
March 12, 2025 at 2:35 AM
Excellent paper by Tania Barone has this lovely image by PhD student Huimin Qu arxiv.org/abs/2503.08041
5 million 😲 I'd imagine this will be massive for the Ellis-Baldwin test.
arxiv.org/abs/2502.13054
#cosmology
arxiv.org/abs/2502.13054
#cosmology
QZO: A Catalog of 5 Million Quasars from the Zwicky Transient Facility
Machine learning methods are well established in the classification of quasars (QSOs). However, the advent of light curve observations adds a great amount of complexity to the problem. Our goal is to ...
arxiv.org
February 19, 2025 at 9:49 AM
5 million 😲 I'd imagine this will be massive for the Ellis-Baldwin test.
arxiv.org/abs/2502.13054
#cosmology
arxiv.org/abs/2502.13054
#cosmology
Reposted by Christopher Harvey-Hawes
How’s this for a Monday morning? 🤩 A team of #HumansOfEuclid discovered an Einstein ring 💍 in nearby galaxy, NGC 6505. Only possible with the unique capabilities of this wonderful telescope!
February 10, 2025 at 10:01 AM
How’s this for a Monday morning? 🤩 A team of #HumansOfEuclid discovered an Einstein ring 💍 in nearby galaxy, NGC 6505. Only possible with the unique capabilities of this wonderful telescope!
It's stunningly close to a perfect ring as well. A nice little teaser before the Q1 data release next month. Gutted to be writing the thesis while all this data comes in 😅
Scientists with #ESAEuclid have discovered an Einstein Ring gravitational lens in a nearby NGC galaxies - something very rare, unexpected, and beautiful. NGC 6505 bends space, turning the image of a background galaxy into a ring.
Read more: www.euclid-ec.org/einstein-rin...
🔭 #space #science
Read more: www.euclid-ec.org/einstein-rin...
🔭 #space #science
Euclid finds complete Einstein Ring in NGC galaxy
A space mission to map the Dark Universe
www.euclid-ec.org
February 10, 2025 at 9:46 AM
It's stunningly close to a perfect ring as well. A nice little teaser before the Q1 data release next month. Gutted to be writing the thesis while all this data comes in 😅
3,500 lenses is crazy. Will be very interested to know what proportion of these end up as spiral galaxy lenses?
arxiv.org/abs/2502.03455
#DESI #cosmology #strong-lensing
arxiv.org/abs/2502.03455
#DESI #cosmology #strong-lensing
DESI Strong Lens Foundry I: HST Observations and Modeling with GIGA-Lens
We present the Dark Energy Spectroscopic Instrument (DESI) Strong Lens Foundry. We discovered $\sim 3500$ new strong gravitational lens candidates in the DESI Legacy Imaging Surveys using residual neu...
arxiv.org
February 6, 2025 at 2:17 PM
3,500 lenses is crazy. Will be very interested to know what proportion of these end up as spiral galaxy lenses?
arxiv.org/abs/2502.03455
#DESI #cosmology #strong-lensing
arxiv.org/abs/2502.03455
#DESI #cosmology #strong-lensing