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Título:
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Testing diagnostics of nuclear activity and star formation in galaxies at z > 1
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Autores:
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Trump, Jonathan R. ;
Konidaris, Nicholas P. ;
Barro, Guillermo ;
Koo, David C. ;
Kocevski, Dale D. ;
Juneau, Stephanie ;
Weiner, Benjamin J. ;
Faber, S. M. ;
McLean, Ian S. ;
Yan, Renbin ;
Pérez González, Pablo Guillermo ;
Villar, Víctor
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing, 2013-01-20
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Tipo = Artículo
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Resumen:
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We present some of the first science data with the new Keck/MOSFIRE instrument to test the effectiveness of different AGN/SF diagnostics at z ~ 1.5. MOSFIRE spectra were obtained in three H-band multi-slit masks in the GOODS-S field, resulting in 2 hr exposures of 36 emission-line galaxies. We compare X-ray data with the traditional emission-line ratio diagnostics and the alternative mass-excitation and color-excitation diagrams, combining new MOSFIRE infrared data with previous HST/WFC3 infrared spectra (from the 3D-HST survey) and multiwavelength photometry. We demonstrate that a high [O III]/H? ratio is insufficient as an active galactic nucleus (AGN) indicator at z > 1. For the four X-ray-detected galaxies, the classic diagnostics ([O III]/H? versus [N II]/H? and [S II]/H?) remain consistent with X-ray AGN/SF classification. The X-ray data also suggest that "composite" galaxies (with intermediate AGN/SF classification) host bona fide AGNs. Nearly ~2/3 of the z ~ 1.5 emission-line galaxies have nuclear activity detected by either X-rays or the classic diagnostics. Compared to the X-ray and line ratio classifications, the mass-excitation method remains effective at z > 1, but we show that the color-excitation method requires a new calibration to successfully identify AGNs at these redshifts.
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En línea:
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https://eprints.ucm.es/38433/1/perezgonzalez19libre.pdf
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