Mastodawn

Little red dot reveals naked black hole #science
https://atlas.whatip.xyz/post.php?slug=little-red-dot-reveals-naked-black-hole-science
<p>JWST finds a black hole in a lensed ‘little red dot’ Astronomers used observations from the James
#reveals #little #lensed #black

Little red dot reveals naked black hole #science

JWST finds a black hole in a lensed ‘little red dot’ Astronomers used observations from the James Webb Space Telescope of a distant, gravitationally lensed “little red dot” to obtain what is described...

Daniel Fischer Apr 16

A Natural ≳ 100x Telescope: Discovery of the Strongly #Lensed Type II SN 2025mkn at z=1.37: https://arxiv.org/abs/2604.07983 -> The Universe’s Most Powerful Telescope: https://www.universetoday.com/articles/the-universes-most-powerful-telescope

A Natural $\gtrsim 100\times$ Telescope: Discovery of the Strongly Lensed Type II SN 2025mkn at $z=1.37$

We present the discovery of SN 2025mkn, a gravitationally lensed Type II supernova. First detected as a blue transient in ZTF, 0.83$^{\prime\prime}$ from a $z=0.42$ elliptical galaxy, follow-up SNIFS/UH2.2m and LRIS/Keck spectra revealed absorption lines at $z=1.371$. Later JWST NIRCam imaging shows that the bright transient is a close pair of point sources separated by $\sim 0.07^{\prime\prime}$, and a 30 times fainter counterimage opposite the lens, for which NIRSpec reveals strong H$α$ emission also at $z=1.371$. The light curves and spectra are consistent with the Type II supernova source being magnified $\gtrsim 100$ times, with $\sim 250$ required to reconcile its luminosity with that of nearby events such as SN 2023ixf. Lens models are consistent with such high magnifications, and always show that the faint image arrived first (undetected in earlier ZTF imaging), consistent with the later spectral phase of this fainter image. A fourth image is also predicted and possibly detected in the NIRSpec data. Light-curve-based time-delay measurements are not possible due to the first image being the faintest; however, the resolved NIRSpec spectra offer a future opportunity for time-delay cosmography through supernova phase measurements.

arXiv.org

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Knowledge Zone Mar 20

#Lensed #Quasars are extremely distant and luminous active galactic nuclei (AGNs) whose light is bent, distorted, and magnified by the gravity of a foreground massive galaxy or galaxy cluster—a phenomenon known as gravitational lensing.

https://knowledgezone.co.in/kbits/69bbe9e3ad32c9d63dfe282f

Daniel Fischer Feb 12

JWST’s PEARLS - a Candidate Massive Binary Star System in a #Lensed Galaxy at Redshift 0.94: https://iopscience.iop.org/article/10.3847/1538-4357/ae2003 -> JWST Spies a Potential Microlensed Massive Binary Star System: https://aasnova.org/2026/02/11/jwst-spies-a-potential-microlensed-massive-binary-star-system/

JWST’s PEARLS: A Candidate Massive Binary Star System in a Lensed Galaxy at Redshift 0.94

JWST’s PEARLS: A Candidate Massive Binary Star System in a Lensed Galaxy at Redshift 0.94, Williams, Hayley, Kelly, Patrick L., Zapartas, Emmanouil, Windhorst, Rogier A., Conselice, Christopher J., Cohen, Seth H., Dhanasingham, Birendra, Diego, José M., Filippenko, Alexei V., Frye, Brenda L., Holwerda, Benne W., Jones, Terry J., Koekemoer, Anton M., Meena, Ashish Kumar, Ricotti, Massimo, Robertson, Clayton D., Saikia, Payaswini, Sun, Bangzheng, Willner, S. P., Yan, Haojing, Zitrin, Adi

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