Idioma:

The 450 Day X-Ray Monitoring of the Changing-look AGN 1ES 1927+654

Ricci, C. ; Loewenstein, M. ; Kara, E. ; Remillard, R. ; Trakhtenbrot, B. ; Arcavi, I. ; Gendreau, K. C. ; Arzoumanian, Z. ; Fabian, A. C. ; Li, R. ; Ho, L. C. ; MacLeod, C. L. ; Cackett, E. ; Altamirano, D. ; Gandhi, P. ; Kosec, P. ; Pasham, D. ; Steiner, J. ; Chan, C.-H.

The Astrophysical journal, 2021-07, Vol.255 (1), p.7 [Periódico revisado por pares]

Goddard Space Flight Center: The American Astronomical Society

Texto completo disponível

Citações Citado por

Enviar para

Título:
The 450 Day X-Ray Monitoring of the Changing-look AGN 1ES 1927+654
Autor: Ricci, C. ; Loewenstein, M. ; Kara, E. ; Remillard, R. ; Trakhtenbrot, B. ; Arcavi, I. ; Gendreau, K. C. ; Arzoumanian, Z. ; Fabian, A. C. ; Li, R. ; Ho, L. C. ; MacLeod, C. L. ; Cackett, E. ; Altamirano, D. ; Gandhi, P. ; Kosec, P. ; Pasham, D. ; Steiner, J. ; Chan, C.-H.
Assuntos: Active galactic nuclei ; Astronomy ; Astrophysical black holes ; Balmer lines ; Blackbody ; Emission lines ; Luminosity ; Object recognition ; Supermassive black holes ; X-ray quasars ; X-rays ; XMM (spacecraft)
É parte de: The Astrophysical journal, 2021-07, Vol.255 (1), p.7
Notas: AAS24923
High-Energy Phenomena and Fundamental Physics
GSFC
Goddard Space Flight Center
Descrição: 1ES 1927+654 is a nearby active galactic nucleus (AGN) that underwent a changing-look event in early 2018, developing prominent broad Balmer lines that were absent in previous observations. We have followed up this object in the X-rays with an ongoing campaign that started in 2018 May and that includes 265 NICER (for a total of 678 ks) and 14 Swift/XRT (26 ks) observations, as well as three simultaneous XMM-Newton/NuSTAR (158/169 ks) exposures. In the X-rays, 1ES 1927+654 shows a behavior unlike any previously known AGN. The source is extremely variable both in spectral shape and flux and does not show any correlation between X-ray and UV flux on timescales of hours or weeks/months. After the outburst, the power-law component almost completely disappeared, and the source showed an extremely soft continuum dominated by a blackbody component. The temperature of the blackbody increases with the luminosity, going from kT∼80 eV (for a 0.3–2 keV luminosity ofL0.3−2∼1041.5erg s−1) to∼200 eV (forL0.3−2∼1044erg s−1). The spectra show evidence of ionized outflows and of a prominent feature at ∼1 keV, which can be reproduced by a broad emission line. The unique characteristics of1ES 1927+654 in the X-ray band suggest that it belongs to a new type of changing-look AGN. Future X-ray surveys might detect several more objects with similar properties.
Editor: Goddard Space Flight Center: The American Astronomical Society
Idioma: Inglês

Voltar para lista de resultados

Realização: Logos de Redes Sociais:

The 450 Day X-Ray Monitoring of the Changing-look AGN 1ES 1927+654

Ricci, C. ; Loewenstein, M. ; Kara, E. ; Remillard, R. ; Trakhtenbrot, B. ; Arcavi, I. ; Gendreau, K. C. ; Arzoumanian, Z. ; Fabian, A. C. ; Li, R. ; Ho, L. C. ; MacLeod, C. L. ; Cackett, E. ; Altamirano, D. ; Gandhi, P. ; Kosec, P. ; Pasham, D. ; Steiner, J. ; Chan, C.-H.

Goddard Space Flight Center: The American Astronomical Society

Buscando em bases de dados remotas. Favor aguardar.