Uncovering the geometry of the hot X-ray corona in the seyfert galaxy NGC 4151 with IXPE
V. E. Gianolli
(1)
,
D. E. Kim
,
S. Bianchi
,
B. Agís-González
,
G. Madejski
,
F. Marin
(2)
,
A. Marinucci
,
G. Matt
,
R. Middei
,
P. -O. Petrucci
(1)
,
P. Soffitta
,
D. Tagliacozzo
,
F. Tombesi
,
F. Ursini
,
T. Barnouin
(2)
,
A. De Rosa
,
L. Di Gesu
,
A. Ingram
,
V. Loktev
,
C. Panagiotou
,
J. Podgorny
(2)
,
J. Poutanen
,
S. Puccetti
,
A. Ratheesh
,
A. Veledina
,
W. Zhang
,
I. Agudo
,
L. A. Antonelli
,
M. Bachetti
,
L. Baldini
,
W. H. Baumgartner
,
R. Bellazzini
,
S. D. Bongiorno
,
R. Bonino
,
A. Brez
,
N. Bucciantini
,
F. Capitanio
,
S. Castellano
,
E. Cavazzuti
,
C. -T. Chen
,
S. Ciprini
,
E. Costa
,
E. del Monte
,
N. Di Lalla
,
A. Di Marco
,
I. Donnarumma
,
V. Doroshenko
,
M. Dovčiak
,
S. R. Ehlert
,
T. Enoto
,
Y. Evangelista
,
S. Fabiani
,
R. Ferrazzoli
,
J. A. García
,
S. Gunji
,
J. Heyl
,
W. Iwakiri
,
S. G. Jorstad
,
P. Kaaret
,
V. Karas
,
F. Kislat
,
T. Kitaguchi
,
J. J. Kolodziejczak
,
H. Krawczynski
,
F. La Monaca
,
L. Latronico
,
I. Liodakis
,
S. Maldera
,
A. Manfreda
,
A. P. Marscher
,
H. L. Marshall
,
F. Massaro
,
I. Mitsuishi
,
T. Mizuno
,
F. Muleri
,
M. Negro
,
C. -Y. Ng
,
S. L. O'Dell
,
N. Omodei
,
C. Oppedisano
,
A. Papitto
,
G. G. Pavlov
,
A. L. Peirson
,
M. Perri
,
M. Pesce-Rollins
,
M. Pilia
,
A. Possenti
,
B. D. Ramsey
,
J. Rankin
,
O. J. Roberts
,
R. W. Romani
,
C. Sgrò
,
P. Slane
,
G. Spandre
,
D. A. Swartz
,
T. Tamagawa
,
F. Tavecchio
,
R. Taverna
,
Y. Tawara
,
A. F. Tennant
,
N. E. Thomas
,
A. Trois
,
S. S. Tsygankov
,
R. Turolla
,
J. Vink
,
M. C. Weisskopf
,
K. Wu
,
F. Xie
,
S. Zane
D. E. Kim
- Function : Author
S. Bianchi
- Function : Author
B. Agís-González
- Function : Author
G. Madejski
- Function : Author
A. Marinucci
- Function : Author
G. Matt
- Function : Author
R. Middei
- Function : Author
P. Soffitta
- Function : Author
D. Tagliacozzo
- Function : Author
F. Tombesi
- Function : Author
F. Ursini
- Function : Author
- PersonId : 1176271
- ORCID : 0000-0001-9442-7897
- IdRef : 204069068
A. De Rosa
- Function : Author
L. Di Gesu
- Function : Author
A. Ingram
- Function : Author
V. Loktev
- Function : Author
C. Panagiotou
- Function : Author
J. Poutanen
- Function : Author
S. Puccetti
- Function : Author
A. Ratheesh
- Function : Author
A. Veledina
- Function : Author
W. Zhang
- Function : Author
I. Agudo
- Function : Author
L. A. Antonelli
- Function : Author
M. Bachetti
- Function : Author
L. Baldini
- Function : Author
W. H. Baumgartner
- Function : Author
R. Bellazzini
- Function : Author
S. D. Bongiorno
- Function : Author
R. Bonino
- Function : Author
A. Brez
- Function : Author
N. Bucciantini
- Function : Author
F. Capitanio
- Function : Author
S. Castellano
- Function : Author
E. Cavazzuti
- Function : Author
C. -T. Chen
- Function : Author
S. Ciprini
- Function : Author
E. Costa
- Function : Author
E. del Monte
- Function : Author
N. Di Lalla
- Function : Author
A. Di Marco
- Function : Author
I. Donnarumma
- Function : Author
V. Doroshenko
- Function : Author
M. Dovčiak
- Function : Author
S. R. Ehlert
- Function : Author
T. Enoto
- Function : Author
Y. Evangelista
- Function : Author
S. Fabiani
- Function : Author
R. Ferrazzoli
- Function : Author
J. A. García
- Function : Author
S. Gunji
- Function : Author
J. Heyl
- Function : Author
W. Iwakiri
- Function : Author
S. G. Jorstad
- Function : Author
P. Kaaret
- Function : Author
V. Karas
- Function : Author
F. Kislat
- Function : Author
T. Kitaguchi
- Function : Author
J. J. Kolodziejczak
- Function : Author
H. Krawczynski
- Function : Author
F. La Monaca
- Function : Author
L. Latronico
- Function : Author
I. Liodakis
- Function : Author
S. Maldera
- Function : Author
A. Manfreda
- Function : Author
A. P. Marscher
- Function : Author
H. L. Marshall
- Function : Author
F. Massaro
- Function : Author
I. Mitsuishi
- Function : Author
T. Mizuno
- Function : Author
F. Muleri
- Function : Author
M. Negro
- Function : Author
C. -Y. Ng
- Function : Author
S. L. O'Dell
- Function : Author
N. Omodei
- Function : Author
C. Oppedisano
- Function : Author
A. Papitto
- Function : Author
G. G. Pavlov
- Function : Author
A. L. Peirson
- Function : Author
M. Perri
- Function : Author
M. Pesce-Rollins
- Function : Author
M. Pilia
- Function : Author
A. Possenti
- Function : Author
B. D. Ramsey
- Function : Author
J. Rankin
- Function : Author
O. J. Roberts
- Function : Author
R. W. Romani
- Function : Author
C. Sgrò
- Function : Author
P. Slane
- Function : Author
G. Spandre
- Function : Author
D. A. Swartz
- Function : Author
T. Tamagawa
- Function : Author
F. Tavecchio
- Function : Author
R. Taverna
- Function : Author
Y. Tawara
- Function : Author
A. F. Tennant
- Function : Author
N. E. Thomas
- Function : Author
A. Trois
- Function : Author
S. S. Tsygankov
- Function : Author
R. Turolla
- Function : Author
J. Vink
- Function : Author
M. C. Weisskopf
- Function : Author
K. Wu
- Function : Author
F. Xie
- Function : Author
S. Zane
- Function : Author
Abstract
We present an X-ray spectro-polarimetric analysis of the bright Seyfert galaxy NGC 4151. The source has been observed with the Imaging X-ray Polarimetry Explorer (IXPE) for 700 ks, complemented with simultaneous XMM-Newton (50 ks) and NuSTAR (100 ks) pointings. A polarization degree Π = 4.9 ± 1.1% and angle Ψ = 86○ ± 7○ east of north (68% confidence level) are measured in the 2-8 keV energy range. The spectro-polarimetric analysis shows that the polarization could be entirely due to reflection. Given the low reflection flux in the IXPE band, this requires however a reflection with a very large (>38%) polarization degree. Assuming more reasonable values, a polarization degree of the hot corona ranging from ~4 to ~8% is found. The observed polarization degree excludes a 'spherical' lamppost geometry for the corona, suggesting instead a slab-like geometry, possibly a wedge, as determined via Monte Carlo simulations. This is further confirmed by the X-ray polarization angle, which coincides with the direction of the extended radio emission in this source, supposed to match the disc axis. NGC 4151 is the first AGN with an X-ray polarization measure for the corona, illustrating the capabilities of X-ray polarimetry and IXPE in unveiling its geometry.
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