Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Ivanna Escala"'
Autor:
L. R. Cullinane, Karoline M. Gilbert, Ivanna Escala, J. Leigh Wojno, Evan N. Kirby, Kateryna A. Kvasova, Erik Tollerud, Michelle L. M. Collins, R. Michael Rich
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 133 (2024)
With a luminosity similar to that of Milky Way dwarf spheroidal systems like Sextans, but a spatial extent similar to that of ultra-diffuse galaxies, Andromeda (And) XIX is an unusual satellite of M31. To investigate the origin of this galaxy, we mea
Externí odkaz:
https://doaj.org/article/84ca5411acc642eda254f5e41c81cb66
Autor:
Emily C. Cunningham, Jason A. S. Hunt, Adrian M. Price-Whelan, Kathryn V. Johnston, Melissa K. Ness, Yuxi (Lucy) Lu, Ivanna Escala, Ioana A. Stelea
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 95 (2024)
The stellar stream connected to the Sagittarius (Sgr) dwarf galaxy is the most massive tidal stream that has been mapped in the Galaxy, and is the dominant contributor to the outer stellar halo of the Milky Way (MW). We present metallicity maps of th
Externí odkaz:
https://doaj.org/article/88cd17b25ac3497ea0c88ac466f617a3
Autor:
L. R. Cullinane, Karoline M. Gilbert, Puragra Guhathakurta, A. C. N. Quirk, Ivanna Escala, Adam Smercina, Benjamin F. Williams, Erik Tollerud, Jessamine Qu, Kaela McConnell
Publikováno v:
The Astrophysical Journal, Vol 958, Iss 2, p 157 (2023)
The dwarf galaxy Triangulum (M33) presents an interesting testbed for studying stellar halo formation: it is sufficiently massive so as to have likely accreted smaller satellites, but also lies within the regime where feedback and other “in situ”
Externí odkaz:
https://doaj.org/article/b0bf4192709f4604a3a67629ec85ed61
Autor:
Kevin A. McKinnon, Emily C. Cunningham, Constance M. Rockosi, Puragra Guhathakurta, Ivanna Escala, Evan N. Kirby, Alis J. Deason
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 43 (2023)
The Halo Assembly in Lambda Cold Dark Matter: Observations in 7 Dimensions (HALO7D) survey measures the kinematics and chemical properties of stars in the Milky Way (MW) stellar halo to learn about the formation of our Galaxy. HALO7D consists of Keck
Externí odkaz:
https://doaj.org/article/df5ddbc584e1430a9ba80af99ba0e9ae
Autor:
J. Leigh Wojno, Karoline M. Gilbert, Evan N. Kirby, Ivanna Escala, Puragra Guhathakurta, Rachael L. Beaton, Jason Kalirai, Masashi Chiba, Steven R. Majewski
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 12 (2023)
We present spectroscopic chemical abundances of red giant branch stars in Andromeda (M31), using medium-resolution ( R ∼ 6000) spectra obtained via the Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo survey. In addition to ind
Externí odkaz:
https://doaj.org/article/4df998deb2bc41ad91538f78358fe893
Autor:
Ivanna Escala, Amanda C. N. Quirk, Puragra Guhathakurta, Karoline M. Gilbert, J. Leigh Wojno, Lara Cullinane, Benjamin F. Williams, Julianne Dalcanton
Publikováno v:
The Astronomical Journal, Vol 165, Iss 2, p 75 (2023)
Stellar kinematics and metallicity are key to exploring formation scenarios for galactic disks and halos. In this work, we characterized the relationship between kinematics and photometric metallicity along the line of sight to M31's disk. We combine
Externí odkaz:
https://doaj.org/article/8796b2e8619f43fb9b526996c105b0cf
Autor:
Ivanna Escala, Amanda C. N. Quirk, Puragra Guhathakurta, Karoline M. Gilbert, J. Leigh Wojno, Lara Cullinane, Benjamin F. Williams, Julianne Dalcanton
Stellar kinematics and metallicity are key to exploring formation scenarios for galactic disks and halos. In this work, we characterized the relationship between kinematics and photometric metallicity along the line-of-sight to M31's disk. We combine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d993482eda73bd2d165f188a89985e2
http://arxiv.org/abs/2209.07962
http://arxiv.org/abs/2209.07962
Autor:
Eliot Quataert, Cameron Hummels, Philip F. Hopkins, Dušan Kereš, Cameron Trapp, T. K. Chan, Andrew Wetzel, Claude André Faucher-Giguère, Norman Murray, Ivanna Escala
Publikováno v:
Monthly notices of the Royal Astronomical Society, 2022, Vol.509(3), pp.4149-4170 [Peer Reviewed Journal]
Observations indicate that a continuous supply of gas is needed to maintain observed star formation rates in large, disky galaxies. To fuel star formation, gas must reach the inner regions of such galaxies. Despite its crucial importance for galaxy e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a0018d5684eef0d48217a4af856c2b6
http://arxiv.org/abs/2105.11472
http://arxiv.org/abs/2105.11472
We analyze existing measurements of [Fe/H] and [$\alpha$/Fe] for individual red giant branch (RGB) stars in the Giant Stellar Stream (GSS) of M31 to determine whether spatial abundance gradients are present. These measurements were obtained from low-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8e6ea12b1ff6b43850c61e0dbaa58c1
http://arxiv.org/abs/2105.02339
http://arxiv.org/abs/2105.02339
Autor:
Emily C. Cunningham, Robyn E. Sanderson, Kathryn V. Johnston, Nondh Panithanpaisal, Melissa K. Ness, Andrew Wetzel, Sarah R. Loebman, Ivanna Escala, Danny Horta, Claude-André Faucher-Giguère
In the era of large-scale spectroscopic surveys in the Local Group (LG), we can explore using chemical abundances of halo stars to study the star formation and chemical enrichment histories of the dwarf galaxy progenitors of the Milky Way (MW) and M3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da3db66b93245e98b95f67385cc61ff3