Matt Hayes

@antihayestamine
33 Followers
73 Following
43 Posts

I like:
- big things in space (that'd be galaxies, but really I prefer the smaller ones)
- small things in space (that'd be black holes, but really I prefer the bigger ones)
- mixing (drinking) the finest cocktails (prefer smaller)
- running (walking) a very long way (prefer bigger)
- any product made out of wheat

I dislike:
- when my bike lights run out of battery
- all the other stuff that (i hope) you don't like either
- bananas (but I love B.A.N.A.N.A.S.)
but the Hayes abides

Matt HayesNov 3, 2022
markpanningNov 3, 2022
Today I was reminded that #JPL has a Raiders of the Lost Ark-like storage facility, but for #spacecraft stuff. I have no idea how one goes about getting access to it, but wouldn't it be fun to wander through?
Matt HayesNov 3, 2022
Sheril KirshenbaumOct 30, 2022

Mastodon isn’t new, but the #Twittermigration is huge. So it’s a good moment for us to discuss how we want to use this platform as new communities emerge on #mastodon.

I’m hoping to meet people interested or working on issues related to #science, #climate, the #food system, #media, policy, & #scicomm.

Also here to support students, postdocs & others finding their voices, meet collaborators & dream up big ideas 💡

Matt HayesNov 3, 2022
Dr. Juande Santander-VelaNov 3, 2022
We’re on day 5 of recovery after the cyberattack that made us close observing operations at #ALMA… many thanks to all people at the observatory that left all their plans on a long weekend to help assess, contain, and now recover operations… https://www.bleepingcomputer.com/news/security/alma-observatory-shuts-down-operations-due-to-a-cyberattack/
ALMA Observatory shuts down operations due to a cyberattack

The Atacama Large Millimeter Array (ALMA) Observatory in Chile has suspended all astronomical observation operations and taken its public website offline following a cyberattack on Saturday, October 29, 2022.

BleepingComputer
Matt HayesNov 3, 2022

POSITIVE: The proposal addresses important topics in contemporary astrophysics, making it a timely and appropriate use of telescope time. The observations are well-suited to the stated objectives.

NEGATIVE: The sample size is not well motivated, and it is unclear how the results will generalize more broadly. The proposal would have been stronger had it made explicit comparison to theoretical predictions.

Grade: 3/5.

Any other generic, boilerplate, zero-information TAC comments, #astrodon?

Matt HayesNov 3, 2022
Chris UsherNov 3, 2022
New paper out on stellar rotation in star clusters I was involved in https://arxiv.org/abs/2211.00693 Led by Sebastian Kamann, the paper finds the split main sequence in the 100 Myr 10^5 M_Sun star cluster NGC 1850 is due to a rotation bimodal distribution. We also find a bunch of Be and shell stars
The effects of stellar rotation along the main sequence of the 100 Myr old massive cluster NGC 1850

Young star clusters enable us to study the effects of stellar rotation on an ensemble of stars of the same age and across a wide range in stellar mass and are therefore ideal targets for understanding the consequences of rotation on stellar evolution. We combine MUSE spectroscopy with HST photometry to measure the projected rotational velocities (Vsini) of 2,184 stars along the split main sequence and on the main sequence turn-off (MSTO) of the 100 Myr-old massive (10^5 M_sun) star cluster NGC 1850 in the Large Magellanic Cloud. At fixed magnitude, we observe a clear correlation between Vsini and colour, in the sense that fast rotators appear redder. The average Vsini values for stars on the blue and red branches of the split main sequence are ~100 km/s and ~200 km/s, respectively. The values correspond to about 25-30% and 50-60% of the critical rotation velocity and imply that rotation rates comparable to those observed in field stars of similar masses can explain the split main sequence. Our spectroscopic sample contains a rich population of ~200 fast rotating Be stars. The presence of shell features suggests that 23% of them are observed through their decretion disks, corresponding to a disk opening angle of 15 degrees. These shell stars can significantly alter the shape of the MSTO, hence care should be taken when interpreting this photometric feature. Overall, our findings impact our understanding of the evolution of young massive clusters and provide new observational constraints for testing stellar evolutionary models.

arXiv.org
Matt HayesNov 3, 2022
Eugen RochkoNov 3, 2022
199,430 is the number of new users across different Mastodon servers since October 27, along with 437 new servers. This bring last day's total to 608,837 active users, which is without precedent the highest it's ever been for Mastodon and the fediverse.
Matt HayesNov 3, 2022

I find your lack of fuzz disturbing.

Here is the latest instalment of starburst-galaxy-of-the-day series (give it 3 more days, max...) An unusually compact #starburst observed by #Hubble YESTERDAY!

Usually we see a faint, diffuse glow around these things, indicating the starburst has ignited in an already-exising #galaxy. But not here, it seems. It looks as though that burst is everything (but indeed the host may just be very very faint..). #astrodon #astronomy

Matt HayesNov 3, 2022
Jane RigbyNov 2, 2022
Hello #astrodon. Just little old me, JWST Ops Project Scientist, AAS Trustee, dissector of gravitationally lensed galaxies, employee of one of the better space agencies. I have no idea how mastodon works.
Matt HayesNov 3, 2022
Aylan CouchieOct 30, 2022
Academic carvings
Matt HayesNov 3, 2022
Dan ScolnicNov 3, 2022
New paper out led by Duke undergrad Ava Bailey and postdoc mentor Maria Vincenzi: https://arxiv.org/abs/2211.01206 . Paper poses a question - how useful can Euclid be for SN Ia cosmology considering it's just designed for LSS probes. Turns out with deep fields, they have repeat observations, then long gaps, but those repeats can be quite useful. We show this would really boost LSST constraints, and independently help solve one of biggest mysteries of SNe Ia. And would be great Roman prep. #Astrodon
Type Ia Supernova cosmology combining data from the $Euclid$ mission and the Vera C. Rubin Observatory

The $Euclid$ mission will provide first-of-its-kind coverage in the near-infrared over deep (three fields, $\sim$10-20 square degrees each) and wide ($\sim$10000 square degrees) fields. While the survey is not designed to discover transients, the deep fields will have repeated observations over a two-week span, followed by a gap of roughly six months. In this analysis, we explore how useful the deep field observations will be for measuring properties of Type Ia supernovae (SNe Ia). Using simulations that include $Euclid$'s planned depth, area and cadence in the deep fields, we calculate that more than 3700 SNe between $0.0<z<1.5$ will have at least five $Euclid$ detections around peak with signal-to-noise ratio larger than 3. While on their own, $Euclid$ light curves are not good enough to directly constrain distances, when combined with LSST deep field observations, we find that uncertainties on SN distances are reduced by 20-30% for $z<0.8$ and by 40-50% for $z>0.8$. Furthermore, we predict how well additional $Euclid$ mock data can be used to constrain a key systematic in SN Ia studies - the size of the luminosity 'step' found between SNe hosted in high mass ($>10^{10} M_{\odot}$) and low mass ($>10^{10} M_{\odot}$) galaxies. This measurement has unique information in the rest-frame NIR. We predict that if the step is caused by dust, we will be able to measure its reduction in the NIR compared to optical at the 4$σ$ level. We highlight that the LSST and $Euclid$ observing strategies used in this work are still provisional and some level of joint processing is required. Still, these first results are promising, and assuming $Euclid$ begins observations well before the Nancy Roman Space Telescope (Roman), we expect this dataset to be extremely helpful for preparation for Roman itself.

arXiv.org