The Nuclear Source of the Galactic Wind in NGC 253
| Autor: | Horacio Alberto Dottori, Ruben Diaz, M. P. Agüero, G. Gunthardt, J. A. Camperi, G. Gimeno |
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| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
INDIVIDUAL (NGC 253) [GALAXIES] FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences purl.org/becyt/ford/1 [https] 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Emission spectrum Spectral resolution 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Line (formation) Luminous infrared galaxy Physics NUCLEI [GALAXIES] Star formation Velocity dispersion GALAXIES [INFRARED] Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Astrophysics - Astrophysics of Galaxies Galaxy Radial velocity Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) KINEMATICS AND DYNAMICS [GALAXIES] |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/ab2f7c |
| Popis: | We present Brγ emission line kinematics of the nuclear region of NGC 253, recently known to host a strong galactic wind that limits the global star formation of the galaxy. We obtained high-resolution long-slit spectroscopic data with PHOENIX at Gemini South, positioning the slit on the nucleus infrared core (IRC), close to the nuclear disk major axis. The spatial resolution was 0.″35 (∼6 pc) and the slit length was 14″ (∼240 pc). The spectral resolution was ∼74,000, unprecedentedly high for galactic nuclei observations at ∼2.1 μm. The line profiles appear highly complex, with blue asymmetry up to 3.″5 away of the IRC, and red asymmetries further away to northeast. Several Gaussian components are necessary to fit the profile, nevertheless a narrow and a wide one predominate. The IRC presents kinematic widths above 700 km s-1 (FWZI), and broad component FWHM ∼ 400 km s-1, the highest detected in a nearby galaxy. At the IRC, the blueshifted broad component displays a 90 km s-1 bump in radial velocity distribution, a feature we previously detected in molecular gas kinematics. The narrow component velocity dispersion (∼32 km s-1) is within the expected for normal galaxies and luminous infrared galaxies (LIRGs). Intermediate components (FWHM ∼ 150 km s-1, redshifted to the northeast, blueshifted to the southwest) appear at some positions, as well as weaker blue (-215 km s-1) and red line wings (+300 km s-1). The IRC depicts a large broad-versus-narrow line flux ratio (F(B)/F(N) ∼ 1.35), and the broad component seems only comparable with those observed at very high star-forming rate galaxies. The results indicate that the IRC would be the main source of the galactic winds originated in the central region of NGC 253. Fil: Gunthardt, Guillermo Ivan. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Grupo de Medio Interest., Instument. y Galaxias; Argentina Fil: Díaz, R. J.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Grupo de Medio Interest., Instument. y Galaxias; Argentina. Gemini Observatory; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Agüero, Maria Paz. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Grupo de Medio Interest., Instument. y Galaxias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Gimeno, G.. Gemini Observatory; Estados Unidos Fil: Dottori, H.. Universidade Federal do Rio Grande do Sul; Brasil Fil: Camperi, Javier Antonio. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Grupo de Medio Interest., Instument. y Galaxias; Argentina |
| Databáze: | OpenAIRE |
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