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Active galactic nuclei in four metal-poo...

Izotov, Y. I....

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Active galactic nuclei in four metal-poor dwarf emission-line galaxies by Izotov, Y. I. ( Author )

Content Provider	Lemonjar Open Access
Publisher	Australian National University
Publication Date	01-08-2023
Summary	We present 3.5m Apache Point Observatory second-epoch spectra of four low-metallicity emission-line dwarf galaxies discovered serendipitously in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) to have extraordinary large broad Halpha luminosities, ranging from 3x10^41 to 2x10^42 erg/s. The oxygen abundance in these galaxies is very low, varying in the range 12+logO/H = 7.36- 7.99. Such extraordinarily high broad Halpha luminosities cannot be accounted for by massive stars at different stages of their evolution. By comparing with the first-epoch SDSS spectra, we find that the broad Halpha luminosities have remained constant over a period of 3-7 years, which probably excludes type IIn supernovae as a possible mechanism of broad emission. The emission most likely comes from accretion disks around intermediate-mass black holes with lower mass limits in the range ~5x10^5 Msun-3x10^6 Msun. If so, these four objects form a new class of very low-metallicity AGN that have been elusive until now. The absence of the strong high-ionization lines [NeV] 3426 and He II 4686 can be understood if the nonthermal radiation contributes less than ~10% of the total ionizing radiation.
ISBN	-
Item Type	Article
File Type	pdf
File Size	29.34 KB
Language	English
Subjects	-
Unlimited	MYR 0.01
Total read	-
URL	doi:10.1086/591660

Citation

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AMA 11th EditionReferences

Izotov, Y. I.. Active galactic nuclei in four metal-poor dwarf emission-line galaxies. Australian National University. August 01, 2023. Accessed November 10, 2024. https://online.provdatabase.com/cite/8670

APA 7th EditionReferences

Izotov, Y. I.. (2023). Active galactic nuclei in four metal-poor dwarf emission-line galaxies. Australian National University. https://online.provdatabase.com/cite/8670

Chicago 17th EditionReferences

Izotov, Y. I.. Active galactic nuclei in four metal-poor dwarf emission-line galaxies. Australian National University. 2023. https://online.provdatabase.com/cite/8670

HarvardReferences

Izotov, Y. I.. (2023). Active galactic nuclei in four metal-poor dwarf emission-line galaxies. [Online]. Australian National University. Available from: https://online.provdatabase.com/cite/8670. (Accessed 10 November 2024).

Harvard AustraliaReferences

Izotov, Y. I., 2023, Active galactic nuclei in four metal-poor dwarf emission-line galaxies, Australian National University, viewed 10 November 2024, <https://online.provdatabase.com/cite/8670>

MLA 9th EditionWorks Cited

Izotov, Y. I.. Active galactic nuclei in four metal-poor dwarf emission-line galaxies. Australian National University, 2023. PROV Database, https://online.provdatabase.com/cite/8670.

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