Suchergebnisse - Alexandra Masegian

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  1. 1
    A 70 pc Diameter Nova Superremnant Surrounding the Recurrent Nova RS Ophiuchi

    A 70 pc Diameter Nova Superremnant Surrounding the Recurrent Nova RS Ophiuchi von Michael M. Shara, Kenneth M. Lanzetta, Alexandra Masegian, James T. Garland, Stefan Gromoll, Alexei Kniazev, Lee Townsend, David Zurek, Joanna Mikolajewska, David Valls-Gabaud, Frederick M. Walter, John K. Webb

    Veröffentlicht 2025-01-01

    Recurrent novae undergo thermonuclear-powered eruptions separated by less than 100 yr, enabled by subgiant or red giant donors transferring hydrogen-rich matter at very high rates onto their massive white dwarf companions. The most rapidly moving parts of envelopes ejected in successive recurrent no...

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  2. 2
    Discovery of a Weak CN Spectral Absorption Feature in Red Supergiant Stars in the Andromeda (M31) and Triangulum (M33) Galaxies

    Discovery of a Weak CN Spectral Absorption Feature in Red Supergiant Stars in the Andromeda (M31) and Triangulum (M33) Galaxies von Puragra Guhathakurta, Douglas Grion Filho, Antara R. Bhattacharya, Lara R. Cullinane, Julianne J. Dalcanton, Karoline M. Gilbert, Leo Girardi, Anika Kamath, Evan N. Kirby, Arya Maheshwari, Paola Marigo, Alexandra Masegian, Amanda C. N. Quirk, Rachel Raikar, Stanley M. Rinehart V, Caelum J. Rodriguez, Benjamin F. Williams

    Veröffentlicht 2025-01-01

    Using Keck DEIMOS spectra of stars in the Andromeda (M31) and Triangulum (M33) galaxies, selected from the large multiband (near-ultraviolet, visible light, and near-infrared) Hubble Space Telescope surveys PHAT and PHATTER, respectively, we have identified a subset of stars that contain a previousl...

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  3. 3
    COOL-LAMPS. VIII. Known Wide-separation Lensed Quasars and Their Host Galaxies Reveal a Lack of Evolution in MBH/M⋆ Since z ∼ 3

    COOL-LAMPS. VIII. Known Wide-separation Lensed Quasars and Their Host Galaxies Reveal a Lack of Evolution in MBH/M⋆ Since z ∼ 3 von Aidan P. Cloonan, Gourav Khullar, Kate A. Napier, Michael D. Gladders, Håkon Dahle, Riley Rosener, Jamar Sullivan Jr., Matthew B. Bayliss, Nathalie Chicoine, Isaiah Escapa, Diego Garza, Josh Garza, Rowen Glusman, Katya Gozman, Gabriela Horwath, Andi Kisare, Benjamin C. Levine, Olina Liang, Natalie Malagon, Michael N. Martinez, Alexandra Masegian, Owen S. Matthews Acuña, Simon D. Mork, Kunwanhui Niu, M. Riley Owens, Yue Pan, Jane R. Rigby, Keren Sharon, Isaac Sierra, Antony A. Stark, Ezra Sukay, Marie Tagliavia, Marcos Tamargo-Arizmendi, Kiyan Tavangar, Raul Teixeira, Kabelo Tsiane, Ruoyang Tu, Grace Wagner, Erik A. Zaborowski, Yunchong Zhang, Yifan “Megan” Zhao

    Veröffentlicht 2025-01-01

    Wide-separation lensed quasars (WSLQs) are a rare class of strongly lensed quasars, magnified by foreground massive galaxy clusters, with typically large magnifications of the multiple quasar images. They are a relatively unexplored opportunity for detailed study of quasar host galaxies. The current...

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