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dc.date.accessioned 2020-05-12T18:26:34Z
dc.date.available 2020-05-12T18:26:34Z
dc.date.issued 2016-04
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/95744
dc.description.abstract We report on the unveiling of the nature of the unidentified X-ray source 3XMM J005450.3–373849 as a Seyfert-2 galaxy located behind the spiral galaxy NGC 300 using Hubble Space Telescope data, new spectroscopic Gemini observations and available XMM–Newton and Chandra data. We show that the X-ray source is positionally coincident with an extended optical source, composed of a marginally resolved nucleus/bulge, surrounded by an elliptical disc-like feature and two symmetrical outer rings. The optical spectrum is typical of a Seyfert-2 galaxy redshifted to z = 0.222 ± 0.001, which confirms that the source is not physically related to NGC 300. At this redshift the source would be located at 909 ± 4 Mpc (comoving distance in the standard model). The X-ray spectra of the source are well fitted by an absorbed power-law model. By tying NH between the six available spectra, we found a variable index Γ running from ∼2 in 2000–2001 to 1.4–1.6 in the 2005–2014 period. Alternatively, by tying Γ, we found variable absorption columns of NH ∼ 0.34 × 10−22 cm−2 in 2000–2001, and 0.54−0.75 × 10−22 cm−2 in the 2005–2014 period. Although we cannot distinguish between a spectral or absorption origin, from the derived unabsorbed X-ray fluxes, we are able to assure the presence of long-term X-ray variability. Furthermore, the unabsorbed X-ray luminosities of 0.8–2 × 1043 erg s−1 derived in the X-ray band are in agreement with a weakly obscured Seyfert-2 AGN at z ≈ 0.22. en
dc.format.extent 1640-1644 es
dc.language en es
dc.subject galaxies: Seyfert es
dc.subject X-rays: galaxies es
dc.subject X-rays: individual: 3XMM J005450.3–373849 es
dc.subject X-rays: individual: XMMU J005450.0–373853 es
dc.title Discovery of a deep Seyfert-2 galaxy at z = 0.222 behind NGC 300 en
dc.type Articulo es
sedici.identifier.uri https://ri.conicet.gov.ar/11336/25953 es
sedici.identifier.uri https://academic.oup.com/mnras/article-abstract/460/2/1640/2608926/Discovery-of-a-deep-Seyfert-2-galaxy-at-z-0-222 es
sedici.identifier.other http://dx.doi.org/10.1093/mnras/stw1012 es
sedici.identifier.other hdl:11336/25953 es
sedici.identifier.issn 0035-8711 es
sedici.creator.person Combi, Jorge Ariel es
sedici.creator.person García, Federico es
sedici.creator.person Rodríguez, María Jimena es
sedici.creator.person Gamen, Roberto Claudio es
sedici.creator.person Cellone, Sergio Aldo es
sedici.subject.materias Astronomía es
sedici.description.fulltext true es
mods.originInfo.place Instituto Argentino de Radioastronomía es
mods.originInfo.place Facultad de Ciencias Astronómicas y Geofísicas es
mods.originInfo.place Instituto de Astrofísica de La Plata es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Monthly Notices of the Royal Astronomical Society es
sedici.relation.journalVolumeAndIssue vol. 460, no. 2 es

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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)