2022A&A...657A..57L


Query : 2022A&A...657A..57L

2022A&A...657A..57L - Astronomy and Astrophysics, volume 657A, 57-57 (2022/1-1)

X-ray spectroscopic survey of highly accreting AGN.

LAURENTI M., PICONCELLI E., ZAPPACOSTA L., TOMBESI F., VIGNALI C., BIANCHI S., MARZIANI P., VAGNETTI F., BONGIORNO A., BISCHETTI M., DEL OLMO A., LANZUISI G., LUMINARI A., MIDDEI R., PERRI M., RICCI C. and VIETRI G.

Abstract (from CDS):

Improving our understanding of the nuclear properties of high-Eddington-ratio (λEdd) active galactic nuclei (AGN) is necessary since at this regime the radiation pressure is expected to affect the structure and efficiency of the accretion disc-corona system. This may cause departures from the typical nuclear properties of low-λEdd AGN, which have been largely studied so far. We present here the X-ray spectral analysis of 14 radio-quiet, λEdd ≥ 1 AGN at 0.4 ≥ z ≥ 0.75, observed with XMM-Newton. Optical/UV data from simultaneous Optical Monitor observations have also been considered. These quasars were selected to have relatively high values of black hole mass (MBH ∼ 108–8.5 M) and bolometric luminosity (Lbol ∼ 1046 erg/s) in order to complement previous studies of high-λEdd AGN at lower MBH and Lbol. We studied the relation between λEdd and other key X-ray spectral parameters, such as the photon index (Γ) of the power-law continuum, the X-ray bolometric correction (k_bol, X_), and the optical/UV-to-X-ray spectral index (αox). Our analysis reveals that, despite the homogeneous optical and supermassive black hole accretion properties, the X-ray properties of these high-λEdd AGN are quite heterogeneous. We indeed measured values of Γ between 1.3 and 2.5, at odds with the expectations based on previously reported Γ - λEdd relations, for which Γ ≥ 2 would be a ubiquitous hallmark of AGN with λEdd ∼ 1. Interestingly, we found that ∼30% of the sources are X-ray weak, with an X-ray emission about a factor of ∼10 - 80 fainter than that of typical AGN at similar UV luminosities. The X-ray weakness seems to be intrinsic and not due to the presence of absorption along the line of sight to the nucleus. This result may indicate that high-λEdd AGN commonly undergo periods of intrinsic X-ray weakness. Furthermore, results from follow-up monitoring with Swift of one of these X-ray weak sources suggest that these periods can last for several years.

Abstract Copyright: © ESO 2022

Journal keyword(s): galaxies: active - quasars: general - quasars: supermassive black holes

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10530 1
2 2MASS J01395577+0619225 Sy1 01 39 55.7697705024 +06 19 22.520805888   16.80 17.00     ~ 171 0
3 [VV2006] J030000.0-080357 QSO 03 00 00.0066457824 -08 03 56.995335000   17.11 16.94     ~ 26 0
4 QSO J0809+4619 QSO 08 09 08.1365285760 +46 19 25.574163852   16.83 16.72     ~ 49 0
5 QSO J0820+2334 QSO 08 20 24.2210785368 +23 34 50.452002372   17.87 17.74     ~ 33 0
6 SDSS J094012.29+461850.3 QSO 09 40 12.2957131752 +46 18 50.308929324           ~ 9 0
7 [VV96] J094033.7+462315 QSO 09 40 33.7561219800 +46 23 15.057456072   17.85 17.59     ~ 42 0
8 2MASSI J1048179+312905 Sy1 10 48 17.9830525056 +31 29 05.780748624   18.31 17.92     ~ 21 0
9 2MASS J11031293+4141549 Sy1 11 03 12.9342552360 +41 41 54.957214860   17.04 16.76     ~ 41 1
10 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 667 2
11 [VV2006] J112756.7+115427 QSO 11 27 56.7661245072 +11 54 27.129296628   17.51 17.35     ~ 28 0
12 2MASS J11275739+6441183 Sy1 11 27 57.4164317808 +64 41 18.398869764   17.83 17.66     ~ 28 0
13 SDSS J120558.16+412825.3 Sy1 12 05 58.1643914160 +41 28 25.363560000   21.16 20.02     ~ 6 0
14 2MASS J12063307+4125361 Sy1 12 06 33.0773977320 +41 25 36.035651964   18.03 17.74     ~ 26 0
15 2MASS J12071557+1512157 Sy1 12 07 15.5814759672 +15 12 15.846623244           ~ 10 0
16 2MASS J12073462+1506438 QSO 12 07 34.6307734152 +15 06 43.697908548   18.31 17.98     ~ 24 0
17 2MASS J12075312+1502213 Sy1 12 07 53.1248487336 +15 02 21.273563544   19.47 18.88     ~ 10 0
18 RMB 221 Sy1 12 18 50.5204079496 +10 15 54.283624488   17.76 17.63     ~ 46 0
19 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5637 1
20 QSO J1245+3356 QSO 12 45 11.2585883616 +33 56 10.098792816   17.06 16.88     ~ 55 0
21 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 270 0
22 PB 4007 Sy1 13 36 02.0092074528 +17 25 13.092799188   16.50 16.33     ~ 87 0
23 2MASX J14510879+2709272 Sy1 14 51 08.7647938560 +27 09 26.962707132   15.01 15.01     ~ 193 0
24 [VV2006] J153913.4+395423 QSO 15 39 13.4726525280 +39 54 23.522785632   18.20 17.90     ~ 29 0

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2023.01.30-22:26:50

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