Tootfinder

JWST ALMA reveal the build up of stellar mass in the cores of dusty star-forming galaxies at Cosmic Noon
Sarah Bodansky, Katherine E. Whitaker, Ayesha Abdullah, Jamie Lin, Pascal A. Oesch, Alexandra Pope, Mengyuan Xiao, Alba Covelo-Paz, Sam Cutler, Carlos Garcia Diaz, Minju M. Lee, Sinclaire M. Manning, Romain A. Meyer, Desika Narayanan, Erica Nelson, Irene Shivaei, Pieter van Dokkum
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The Missing Hard Photons of Little Red Dots: Their Incident Ionizing Spectra Resemble Massive Stars
Bingjie Wang, Joel Leja, Harley Katz, Kohei Inayoshi, Nikko J. Cleri, Anna de Graaff, Raphael E. Hviding, Pieter van Dokkum, Jenny E. Greene, Ivo Labb\'e, Jorryt Matthee, Ian McConachie, Rohan P. Naidu, Erica J. Nelson
https://arxiv.org/…

The Missing Hard Photons of Little Red Dots: Their Incident Ionizing Spectra Resemble Massive Stars
The nature of Little Red Dots (LRDs) has largely been investigated through their continuum emission, with lines assumed to arise from a broad-line region. In this paper, we instead use recombination lines to infer the intrinsic properties of the central engine of LRDs. Our analysis first reveals a tension between the ionizing properties implied from H$α$ and HeII$\,λ$4686. The high H$α$ EWs require copious H-ionizing photons, more than the bluest AGN ionizing spectra can provide. In contrast…

Kinematic Confirmation of a Remarkable Linear Trail of Galaxies in the NGC 1052 Field, Consistent with Formation in a High-Speed Bullet Dwarf Collision
Michael A. Keim, Pieter van Dokkum, Zili Shen, Harrison Souchereau, Imad Pasha, Shany Danieli, Roberto Abraham, Aaron J. Romanowsky, Yimeng Tang
https://arxiv.org/abs/2506.10220

Kinematic Confirmation of a Remarkable Linear Trail of Galaxies in the NGC 1052 Field, Consistent with Formation in a High-Speed Bullet Dwarf Collision
A unique linear trail of diffuse galaxies was recently identified in the NGC 1052 field. This trail includes the remarkable, ultra-diffuse galaxies DF2 and DF4 which lack dark matter and host unusually luminous globular clusters. It has been proposed that the trail formed via a high-speed collision between two gas-rich dwarf galaxies. This scenario predicts that the trail galaxies are kinematically connected and follow a specific trend in radial velocity as a function of position, based on the …

Quantitative Morphology of Galactic Cirrus in Deep Optical Imaging
Qing Liu, Peter Martin, Roberto Abraham, Pieter van Dokkum, Henk Hoekstra, Juan Mir\'o-Carretero, William Bowman, Steven Janssens, Seery Chen, Deborah Lokhorst, Imad Pasha, Zili Shen
https://arxiv.org/abs/2507.05217

Quantitative Morphology of Galactic Cirrus in Deep Optical Imaging
Imaging of optical Galactic cirrus, the spatially resolved form of diffuse Galactic light, provides important insights into the properties of the diffuse interstellar medium (ISM) in the Milky Way. While previous investigations have focused mainly on the intensity characteristics of optical cirrus, their morphological properties remain largely unexplored. In this study, we employ several complementary statistical approaches -- local intensity statistics, angular power spectrum / $Δ$-variance a…