Zobrazeno 1 - 10
of 570
pro vyhledávání: '"chemical enrichment"'
Autor:
Massimo Pascale, Liang Dai
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 166 (2024)
We suggest that “Godzilla” of the lensed Sunburst galaxy ( z = 2.37) is a young super star cluster powering a nebula of gravitationally trapped stellar ejecta. Employing Hubble Space Telescope photometry and spectroscopy from the Very Large Teles
Externí odkaz:
https://doaj.org/article/8019f7953b7a4b8381ad5cd0345e6256
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 232 (2024)
Neutron star mergers (NSMs) produce r -process elements after a time-delayed inspiral process. Once a significant number of NSMs are present in a galaxy, r -process elements, such as Eu, are expected to significantly increase with time. Yet, there ha
Externí odkaz:
https://doaj.org/article/d3fa11737ab640deaec25bfacc8aa21e
Autor:
Hiroto Yanagisawa, Masami Ouchi, Kuria Watanabe, Akinori Matsumoto, Kimihiko Nakajima, Hidenobu Yajima, Kentaro Nagamine, Koh Takahashi, Minami Nakane, Nozomu Tominaga, Hiroya Umeda, Hajime Fukushima, Yuichi Harikane, Yuki Isobe, Yoshiaki Ono, Yi Xu, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 266 (2024)
We present He i /H β flux and He/H abundance ratios in three James Webb Space Telescope galaxies with significant constraints on N/O abundance ratios, GS-NDG-9422, RXCJ2248-ID, and GLASS150008 at z ∼ 6 mostly with the spectroscopic coverage from H
Externí odkaz:
https://doaj.org/article/eb09a0df57fb453e846492ddc1992042
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 186 (2024)
The first generations of stars left their chemical fingerprints on metal-poor stars in the Milky Way and its surrounding dwarf galaxies. While instantaneous and homogeneous enrichment implies that groups of conatal stars should have the same element
Externí odkaz:
https://doaj.org/article/80275cf6422c477f80fdb8cf046a1206
Autor:
Valentina Abril-Melgarejo, Bethan L. James, Alessandra Aloisi, Matilde Mingozzi, Vianney Lebouteiller, Svea Hernandez, Nimisha Kumari, AAS Journals Data Editors
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 173 (2024)
We present a pioneering, spatially resolved, multiphase gas abundance study on the blue compact dwarf galaxy NGC 5253, targeting 10 star-forming (SF) clusters inside six far-UV (FUV) Hubble Space Telescope/Cosmic Origins Spectrograph (COS) pointings
Externí odkaz:
https://doaj.org/article/8d46d50421374413a698bfe6044653ce
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 1, p 55 (2024)
Type Ia supernovae (SNe Ia) produce most of the Fe-peak elements in the Universe and therefore are a crucial ingredient in galactic chemical evolution models. SNe Ia do not explode immediately after star formation, and the delay-time distribution (DT
Externí odkaz:
https://doaj.org/article/fed4d6bb9eb842daa921755aac2769cf
Autor:
Everett Schlawin, Sagnick Mukherjee, Kazumasa Ohno, Taylor J. Bell, Thomas G. Beatty, Thomas P. Greene, Michael Line, Ryan C. Challener, Vivien Parmentier, Jonathan J. Fortney, Emily Rauscher, Lindsey Wiser, Luis Welbanks, Matthew Murphy, Isaac Edelman, Natasha Batalha, Sarah E. Moran, Nishil Mehta, Marcia Rieke
Publikováno v:
The Astronomical Journal, Vol 168, Iss 3, p 104 (2024)
WASP-69 b is a hot, inflated, Saturn-mass planet (0.26 M _Jup ) with a zero-albedo equilibrium temperature of 963 K. Here, we report the JWST 2–12 μ m emission spectrum of the planet consisting of two eclipses observed with NIRCam grism time serie
Externí odkaz:
https://doaj.org/article/e69769acde3d47b0a037dfde7ec88e60
Autor:
Tawny Sit, David H. Weinberg, Adam Wheeler, Christian R. Hayes, Sten Hasselquist, Thomas Masseron, Jennifer Sobeck
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 180 (2024)
Stellar abundance measurements are subject to systematic errors that induce extra scatter and artificial correlations in elemental abundance patterns. We derive empirical calibration offsets to remove systematic trends with surface gravity $\mathrm{l
Externí odkaz:
https://doaj.org/article/8d891a02ded042beb589f27e1876a76f
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 127 (2024)
Our understanding of early-type galaxies (ETGs) has grown in the past decade with the advance of full-spectrum fitting techniques used to infer the properties of the stellar populations that make up the galaxy. We present ages, central velocity dispe
Externí odkaz:
https://doaj.org/article/776fe4d46acb4846bf64323ee6a96672
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 1, p 31 (2024)
A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright ( ${V}_{\max }=7.3$ mag), Fermi-LAT detected γ -ray source, was modeled using the photoionization code CLOUDY. Abundances were estimated for He, C, N, O, Si, Al,
Externí odkaz:
https://doaj.org/article/4afb68aab8584d3687f4ba9b404f6646