2021A&A...649L..11T


Query : 2021A&A...649L..11T

2021A&A...649L..11T - Astronomy and Astrophysics, volume 649, L11-11 (2021/5-1)

The eROSITA Final Equatorial-Depth Survey (eFEDS). An X-ray-bright, extremely luminous infrared galaxy at z = 1.87.

TOBA Y., BRUSA M., LIU T., BUCHNER J., TERASHIMA Y., URRUTIA T., SALVATO M., AKIYAMA M., ARCODIA R., GOULDING A.D., HIGUCHI Y., INOUE K.T., KAWAGUCHI T., LAMER G., MERLONI A., NAGAO T., UEDA Y. and NANDRA K.

Abstract (from CDS):

In this study, we investigate the X-ray properties of WISE J090924.01+000211.1 (WISEJ0909+0002), an extremely luminous infrared (IR) galaxy (ELIRG) at zspec=1.871 in the eROSITA Final Equatorial-Depth Survey. WISEJ0909+0002 is a WISE 22µm source, located in the GAMA-09 field, which was detected by eROSITA during the performance and verification phase. The corresponding optical spectrum indicates that this object is a type-1 active galactic nucleus (AGN). Observations from eROSITA combined with Chandra and XMM-Newton archival data indicate a very luminous (L(2-10 keV)=(2.1±0.2)x1045erg/s) unobscured AGN with a power-law photon index of Γ=1.73–0.15+0.16 and an absorption hydrogen column density of log (NH/cm–2)<21.0. The IR luminosity was estimated to be LIR=(1.79±0.09)x1014L from spectral energy distribution modeling based on 22 photometric data points (X-ray to far-IR) with X-CIGALE, which confirmed that WISEJ0909+0002 is an ELIRG. A remarkably high LIR despite very low NH would indicate that we are witnessing a short-lived phase in which hydrogen gas along the line of sight is blown outward, whereas warm and hot dust heated by AGNs still exists. As a consequence of the eROSITA All-Sky Survey, 6.8–5.6+16x102 such X-ray-bright ELIRGs are expected to be discovered in the entire extragalactic sky (|b|>10°). This can potentially be the key population to constrain the bright end of IR luminosity functions.

Abstract Copyright: © ESO 2021

Journal keyword(s): galaxies: active - X-rays: galaxies - infrared: galaxies - quasars: individual: WISE J090924.01+000211.1

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 [VV2006] J090923.2+000204 QSO 09 09 23.1282798312 +00 02 04.095530088   20.44 20.31     ~ 26 0
2 [VV2006] J090924.1+000211 QSO 09 09 24.0099207720 +00 02 11.113917792   17.06 16.84     ~ 42 0
3 WISE J104222.11+164115.3 G 10 42 22.11 +16 41 15.3           ~ 5 0

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2022.08.11-20:25:18

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