Results 31 to 40 of about 176,382 (265)
Chemical abundances in the dwarf galaxy NGC 4163 based on the nebular and auroral emission lines
Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022 Abstract We constructed an oxygen abundance map and N/O ratio map of the unusually low excitation dwarf irregular galaxy NGC 4163 based on publicly available spectroscopy obtained by the MaNGA survey. We detected auroral emission line [O II]λλ$$ \lambda \lambda $$7320,7330 which allows us to measure chemical abundance by direct Te$$ {\mathrm{T}}_e ...
I. A. Zinchenko, L. S. Pilyugin
wiley +1 more source
Journal of Geophysical Research: Biogeosciences, Volume 127, Issue 2, February 2022., 2022 Abstract Observing the environment in the vast regions of Earth through remote sensing platforms provides the tools to measure ecological dynamics. The Arctic tundra biome, one of the largest inaccessible terrestrial biomes on Earth, requires remote sensing across multiple spatial and temporal scales, from towers to satellites, particularly those ...
Peter R. Nelson +19 more
wiley +1 more source
Kinematics of the dwarf irregular galaxy GR8 [PDF]
Astronomy & Astrophysics, 2003 We present deep, high velocity resolution (~1.6 km/s) Giant Meterwave Radio Telescope HI 21cm synthesis images for the faint (M_B ~ -12.1) dwarf irregular galaxy GR8. We find that the velocity field of the galaxy shows a clear systematic large scale pattern, with a maximum amplitude ~10 km/s.
Jayaram N. Chengalur, Ayesha Begum
openaire +4 more sources
Spectral Feature Extraction Using Partial and General Method
Advances in Astronomy, Volume 2021, Issue 1, 2021., 2021 With the rapid growth in astronomical spectra produced by large sky survey telescopes, traditional manual classification processes can no longer fulfill the requirements of precision and efficiency of spectral classification. There is an urgent need to employ machine learning approaches to conduct automated spectral classification tasks.
Bin Jiang +5 more
wiley +1 more source
The Astrophysical Journal Letters, 2023 Through adaptive optics (AO) imaging with the SOUL+LUCI instrument at the Large Binocular Telescope we were able to resolve, for the first time, individual stars in the gas-rich galaxy DDO68 C. This system was already suggested to be interacting with the
Francesca Annibali +9 more
doaj +1 more source
H i Clouds in LITTLE THINGS Dwarf Irregular Galaxies [PDF]
Astronomical Journal, 2019 We identify 814 discrete H i clouds in 40 dwarf irregular galaxies from the LITTLE THINGS survey using an automated cloud-finding algorithm. The cloud masses range from ∼103 to 107 M⊙, have a surface density averaged over all of the clouds of ∼9.65 M⊙ pc−
D. Hunter, B. Elmegreen, Clara L. Berger
semanticscholar +1 more source
The extended structure of the dwarf irregular galaxy Sagittarius [PDF]
Astronomy & Astrophysics, 2014 We present a detailed study of the stellar and HI structure of the dwarf irregular galaxy Sagittarius. We use new deep and wide field photometry to trace the surface brightness profile of the galaxy out to ~5.0' (corresponding to ~1600 pc) and down to $ _V\simeq 30.0$ mag/arcsec$^2$, thus showing that the stellar body of the galaxy is much more ...
Vincenzo Testa +9 more
openaire +9 more sources
Gas Engaged in Noncircular Motions in LITTLE THINGS Dwarf Irregular Galaxies [PDF]
Astronomical Journal, 2019 We have examined gas engaged in noncircular motions in 22 of the nearby LITTLE THINGS dwarf irregular galaxies. The H i data cubes have been deconvolved into kinematic components—bulk rotation and noncircular motions—to produce maps of integrated gas ...
D. Hunter +4 more
semanticscholar +1 more source
The spatially resolved Kennicutt–Schmidt relation in the H i-dominated regions of spiral and dwarf irregular galaxies [PDF]
, 2015 We study the Kennicutt-Schmidt relation between average star formation rate and average cold gas surface density in the Hi dominated ISM of nearby spiral and dwarf irregular galaxies. We divide the galaxies into grid cells varying from sub-kpc to tens of
Sambit Roychowdhury +4 more
openalex +3 more sources
Searching for TeV DM evidence from Dwarf Irregular Galaxies with the HAWC Observatory [PDF]
, 2017 The dynamics of dwarf irregular (dIrr) galaxies are observed to be dominated by dark matter (DM). Recently, the DM density distribution has been studied for 31 dIrrs. Their extended DM halo (Burket type profile) makes these objects good candidates for DM
S. Hernández +7 more
openalex +3 more sources