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@arXiv_astrophHE_bot@mastoxiv.page
2025-10-01 07:57:27

The Accretion Disk Size Problem in AGN Disk Reverberation Mapping is an Obscuration Effect: A Uniform AGN Sample Study with Swift
Collin Lewin, Erin Kara, Christos Panagiotou, Edward M. Cackett, Jonathan Gelbord, Juan V. Hern\'andez Santisteban, Keith Horne, Gerard A. Kriss
arxiv.org/abs/2509.25315

The Accretion Disk Size Problem in AGN Disk Reverberation Mapping is an Obscuration Effect: A Uniform AGN Sample Study with Swift
In the past decade, Swift has performed several AGN high-cadence reverberation mapping campaigns, and generally found that the UV/optical interband lags are $\sim$3 times longer than predicted for a standard thin disk, thus coined "the accretion disk size problem". Here we present a systematic sample of Swift-monitored AGN. In this analysis, we confirm the accretion disk size problem, but find that the lag excess occurs only in the subset of obscured AGN, which show a significantly elevated mea…

@mlawton@mstdn.social
2025-11-28 20:31:55

Partly bright and sunny, but fully cold and with generous amounts of wind. “Brisk” doesn’t even begin to do it justice. Still, I am a freak and love this weather. It felt good to be out moving. #TeamShorts of course.
Walked briefly twice to bring my HR down a bit and then stopped to mug at this beautiful Great Blue Heron looking for their lunch. 🐟

My running stats: 7.02 km in 51:41 for an average pace of 7:21/km
A Great Blue Heron standing in shallow water, surrounded by autumn foliage and rocky shoreline.
A picturesque river scene with gently flowing water reflecting sunlight. Dense trees line the riverbanks under a backdrop of clouds and a partially visible sun. The atmosphere is serene and natural, showcasing the beauty of the landscape.
A metal bridge with a wooden deck and horizontal railings, surrounded by trees and blue skies with clouds. The perspective is from the center of the bridge, looking down the pathway.
@hikingdude@mastodon.social
2025-12-24 16:04:30

Some more #fog ? It was a bit chill but veeerry silent.
I liked the mood there and how the bushes & trees vanished in the fog. Especially the dead tree at the end that looks like reaching out into the water.
Enjoy the silence 🙂
#photography

This black-and-white image captures a tranquil and mysterious scene of a foggy riverside. The river, calm and smooth, reflects the muted light of the overcast sky. Dense fog envelops the area, obscuring the background and creating an ethereal atmosphere. On the left side of the image, a row of leafless trees stands along the riverbank, their bare branches reaching into the fog. The trees are partially shrouded in mist, adding to the sense of depth and mystery. The fog softens the outlines of t…
@hikingdude@mastodon.social
2025-11-23 14:45:32

I'm just walking a bit after I was hiking a local mountain. And this is really a #silentsunday photo for me.
Winter has arrived 😊
#badtölz #tölzerland

A serene winter landscape unfolds as the sun begins to set, casting a warm, golden glow across a tranquil river. The river, partially covered in a thin layer of ice, reflects the soft light of the setting sun and the bare branches of the surrounding trees. The trees, stripped of their leaves, stand tall and stark against the pale blue sky, their silhouettes adding a sense of calm and stillness to the scene. The riverbank is dusted with a light layer of snow, creating a delicate contrast with t…