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NGC 5643

NGC 5643

Credit: ESA/Hubble & NASA, A. Riess et al.

Dr Ismael Garcia Bernete

Visitor

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Galaxy formation and evolution
ismael.garciabernete@physics.ox.ac.uk
Denys Wilkinson Building, room 765
  • About
  • Publications

Cold molecular gas and PAH emission in the nuclear and circumnuclear regions of Seyfert galaxies

Astronomy & Astrophysics, Volume 639, id.A43, (2020) 17 pp.

Authors:

Alonso-Herrero, A.; Pereira-Santaella, M.; Rigopoulou, D.; García-Bernete, I.; García-Burillo, S.; Domínguez-Fernández, A. J.; Combes, F.; Davies, R. I.; Díaz-Santos, T.; Esparza-Arredondo, D.; González-Martín, O.; Hernán-Caballero, A.; Hicks, E. K. S.; Hönig, S. F.; Levenson, N. A.; Ramos Almeida, C.; Roche, P. F.; Rosario, D.

Abstract:

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Exploring the Mid-infrared SEDs of Six AGN Dusty Torus Models. II. The Data

The Astrophysical Journal American Astronomical Society 884:1 (2019) 11

Authors:

Omaira González-Martín, Josefa Masegosa, Ismael García-Bernete, Cristina Ramos Almeida, José Miguel Rodríguez-Espinosa, Isabel Márquez, Donaji Esparza-Arredondo, Natalia Osorio-Clavijo, Mariela Martínez-Paredes, César Victoria-Ceballos, Alice Pasetto, Deborah Dultzin
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Exploring the Mid-infrared SEDs of Six AGN Dusty Torus Models. I. Synthetic Spectra

The Astrophysical Journal American Astronomical Society 884:1 (2019) 10

Authors:

Omaira González-Martín, Josefa Masegosa, Ismael García-Bernete, Cristina Ramos Almeida, José Miguel Rodríguez-Espinosa, Isabel Márquez, Donaji Esparza-Arredondo, Natalia Osorio-Clavijo, Mariela Martínez-Paredes, César Victoria-Ceballos, Alice Pasetto, Deborah Dultzin
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Nuclear molecular outflow in the Seyfert galaxy NGC 3227

Astronomy and Astrophysics EDP Sciences 628 (2019) A65

Authors:

A Alonso Herrero, S García-Burillo, Miguel Pereira-Santaella, RI Davies, F Combes, M Vestergaard, SI Raimundo, Andrew Bunker, T Díaz-Santos, P Gandhi, I García-Bernete, EKS Hicks, SF Hönig, LK Hunt, M Imanishi, T Izumi, NA Levenson, W Maciejewski1, C Packham, C Ramos Almeida, C Ricci, Dimitra Rigopoulou, Patrick Roche, D Rosario, M Schartmann, A Usero, MJ Ward

Abstract:

ALMA observations have revealed nuclear dusty molecular disks or tori with characteristic sizes 15−40 pc in the few Seyferts and low -luminosity AGN that have been studied so far. These structures are generally decoupled both morphologically and kinematically from the host galaxy disk. We present ALMA observations of the CO(2–1) and CO(3–2) molecular gas transitions and associated (sub-) millimeter continua of the nearby Seyfert 1.5 galaxy NGC 3227 with angular resolutions 0.085 − 0.21″ (7–15 pc). On large scales, the cold molecular gas shows circular motions as well as streaming motions on scales of a few hundred parsecs that are associated with a large-scale bar. We fit the nuclear ALMA 1.3 mm emission with an unresolved component and an extended component. The 850 μm emission shows at least two extended components, one along the major axis of the nuclear disk, and the other along the axis of the ionization cone. The molecular gas in the central region (1″ ∼ 73 pc) shows several CO clumps with complex kinematics that appears to be dominated by noncircular motions. While we cannot conclusively demonstrate the presence of a warped nuclear disk, we also detected noncircular motions along the kinematic minor axis. They reach line-of-sight velocities of v − vsys = 150 − 200 km s−1. Assuming that the radial motions are in the plane of the galaxy, we interpret them as a nuclear molecular outflow due to molecular gas in the host galaxy that is entrained by the AGN wind. We derive molecular outflow rates of 5 M⊙ yr−1 and 0.6 M⊙ yr−1 at projected distances of up to 30 pc to the northeast and southwest of the AGN, respectively. At the AGN location we estimate a mass in molecular gas of 5 × 105 M⊙ and an equivalent average column density N(H2) = 2 − 3 × 1023 cm−2 in the inner 15 pc. The nuclear CO(2–1) and CO(3–2) molecular gas and submillimeter continuum emission of NGC 3227 do not resemble the classical compact torus. Rather, these emissions extend for several tens of parsecs and appear connected with the circumnuclear ring in the host galaxy disk, as found in other local AGN.
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Circumnuclear Star Formation and AGN Activity: Clues from Surface Brightness Radial Profile of PAHs and [ S IV ]

The Astrophysical Journal American Astronomical Society 859:2 (2018) 124

Authors:

Donaji Esparza-Arredondo, Omaira González-Martín, Deborah Dultzin, Almudena Alonso-Herrero, Cristina Ramos Almeida, Tanio Díaz-Santos, Ismael García-Bernete, Mariela Martinez-Paredes, Jose Miguel Rodríguez-Espinosa
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