RT Journal Article
T1 Unveiling gas kinematics and stellar populations in H II regions inside the low-metallicity dwarf nearby galaxy SDSSJ0859+3923 with MEGARA at the GTC
A1 Garcia-Vargas, M. L.
A1 Carrasco, E.
A1 Molla, M.
A1 Gil De Paz, Armando
A1 Gallego Maestro, Jesús
A1 Iglesias-Paramo, J.
A1 Cardiel López, Nicolás
A1 Castillo Morales, María África
A1 Pascual Ramírez, Sergio
A1 Gómez-Álvarez, P.
A1 Perez-Calpena, A.
AB In this study, we present Integral Field Unit observations of the galaxy SDSSJ0859 + 3923, utilizing the MEGARA (Multi Espectrógrafo en GTC de Alta Resolución para Astronomía Instrument on the GTC (Gran Telescopio Canarias) 10.4m telescope. These observations were conducted in two distinct spectral ranges: 4332–5222 Å and 6097–7345 Å, with a high resolving power (RFWHM ∼ 6 000), and spatial resolution of 25 pc, considering the galaxy’s distance of 8.5 Mpc. Our observations have identified five H II regions, whose precise positions were determined using data from the Wide Field Camera 3 (ultraviolet and visible) of the Hubble Space Telescope, WFC3-UVIS/HST, archive images, where we also detected the associated blue underlying continuum linked to the ionized knots. A detailed kinematic analysis of these regions revealed low-velocity dispersion values (around 10 km s−1 ) in four H II regions, indicating a lack of significant turbulent events. In the fifth region, we observed a peak in velocity dispersion reaching 40 km s−1 , which we interpret as the result of hot star winds and/or a recent type-II supernova explosion. We have conducted a comprehensive spectral analysis of the H II regions, obtaining emission-line fluxes that enabled us to confirm the oxygen abundance (12 + log(O/H) = 7.41 ± 0.15) and, using POPSTAR models, to constrain the age and mass of the ionizing young clusters.
PB Oxford University Press (OUP)
SN 0035-8711
YR 2024
FD 2024-11-28
LK https://hdl.handle.net/20.500.14352/117994
UL https://hdl.handle.net/20.500.14352/117994
LA eng
NO M L García-Vargas, E Carrasco, M Mollá, A Gil de Paz, J Gallego, J Iglesias-Páramo, N Cardiel, A Castillo-Morales, S Pascual, P Gómez-Alvarez, A Pérez-Calpena, Unveiling gas kinematics and stellar populations in H ii regions inside the low-metallicity dwarf nearby galaxy SDSSJ0859 + 3923 with MEGARA at the GTC, Monthly Notices of the Royal Astronomical Society, Volume 535, Issue 4, December 2024, Pages 3088–3107, https://doi.org/10.1093/mnras/stae2483
NO "MCIN/AEI/10.13039/501100011033""R + D projects of FRACTAL S.L.N.E. and INAOE""Programa Operativo Canarias FEDER 2014–2020"
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Agencia Estatal de Investigación (España)
NO European Commission
NO Instituto de Astrofísica de Canarias
DS Docta Complutense
RD 11 abr 2025