Publications by Patrick Roche


ALMA spectral survey of Supernova 1987A-molecular inventory, chemistry, dynamics and explosive nucleosynthesis

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469 (2017) 3347-3362

M Matsuura, R Indebetouw, S Woosley, V Bujarrabal, FJ Abellan, R McCray, J Kamenetzky, C Fransson, MJ Barlow, HL Gomez, P Cigan, I De Looze, J Spyromilio, L Staveley-Smith, G Zanardo, P Roche, J Larsson, S Viti, JT van Loon, JC Wheeler, M Baes, R Chevalier, P Lundqvist, JM Marcaide, E Dwek, M Meixner, C-Y Ng, G Sonneborn, J Yates


A mid-infrared statistical investigation of clumpy torus model predictions

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470 (2017) 2578-2598

J Garcia-Gonzalez, A Alonso-Herrero, SF Honig, A Hernan-Caballero, C Ramos Almeida, NA Levenson, PF Roche, O Gonzalez-Martin, C Packham, M Kishimoto


Infrared polarimetry of Mrk 231: scattering off hot dust grains in the central core

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464 (2017) 1762-1770

E Lopez-Rodriguez, C Packham, TJ Jones, R Siebenmorgen, PF Roche, NA Levenson, A Alonso-Herrero, E Perlman, K Ichikawa, C Ramos Almeida, O Gonzalez-Martin, R Nikutta, M Martinez-Paredez, D Shenoy, MS Gordon, CM Telesco


Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D

Astrophysical Journal Letters 842 (2017)

FJ Abellán, R Indebetouw, JM Marcaide, M Gabler, C Fransson, J Spyromilio, DN Burrows, R Chevalier, P Cigan, BM Gaensler, HL Gomez, HT Janka, R Kirshner, J Larsson, P Lundqvist, M Matsuura, R McCray, CY Ng, S Park, P Roche, L Staveley-Smith, JTV Loon, JC Wheeler, SE Woosley

© 2017. The American Astronomical Society. All rights reserved. Most massive stars end their lives in core-collapse supernova explosions and enrich the interstellar medium with explosively nucleosynthesized elements. Following core collapse, the explosion is subject to instabilities as the shock propagates outward through the progenitor star. Observations of the composition and structure of the innermost regions of a core-collapse supernova provide a direct probe of the instabilities and nucleosynthetic products. SN 1987A in the Large Magellanic Cloud is one of very few supernovae for which the inner ejecta can be spatially resolved but are not yet strongly affected by interaction with the surroundings. Our observations of SN 1987A with the Atacama Large Millimeter/submillimeter Array are of the highest resolution to date and reveal the detailed morphology of cold molecular gas in the innermost regions of the remnant. The 3D distributions of carbon and silicon monoxide (CO and SiO) emission differ, but both have a central deficit, or torus-like distribution, possibly a result of radioactive heating during the first weeks ("nickel heating"). The size scales of the clumpy distribution are compared quantitatively to models, demonstrating how progenitor and explosion physics can be constrained.


The complex evolutionary paths of local infrared bright galaxies: a high-angular resolution mid-infrared view

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463 (2016) 2405-2424

A Alonso-Herrero, R Poulton, PF Roche, A Hernan-Caballero, I Aretxaga, M Martinez-Paredes, C Ramos Almeida, M Pereira-Santaella, T Diaz-Santos, NA Levenson, C Packham, L Colina, P Esquej, O Gonzalez-Martin, K Ichikawa, M Imanishi, JM Rodriguez Espinosa, C Telesco


A mid-infrared spectroscopic atlas of local active galactic nuclei on sub-arcsecond resolution using GTC/CanariCam

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 455 (2016) 563-583

A Alonso-Herrero, P Esquej, PF Roche, C Ramos Almeida, O Gonzalez-Martin, C Packham, NA Levenson, RE Mason, A Hernan-Caballero, M Pereira-Santaella, C Alvarez, I Aretxaga, E Lopez-Rodriguez, L Colina, T Diaz-Santos, M Imanishi, JM Rodriguez Espinosa, E Perlman


The nuclear and integrated far-infrared emission of nearby Seyfert galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458 (2016) 4512-4529

J Garcia-Gonzalez, A Alonso-Herrero, A Hernan-Caballero, M Pereira-Santaella, C Ramos-Almeida, JA Acosta-Pulido, T Diaz-Santos, P Esquej, O Gonzalez-Martin, K Ichikawa, E Lopez-Rodriguez, M Povic, PF Roche, M Sanchez-Portal


Mid-infrared imaging- and spectro-polarimetric subarcsecond observations of NGC 1068

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458 (2016) 3851-3866

E Lopez-Rodriguez, C Packham, PF Roche, A Alonso-Herrero, T Diaz-Santos, R Nikutta, O Gonzalez-Martin, CA Alvarez, P Esquej, JM Rodriguez Espinosa, E Perlman, C Ramos Almeida, CM Telesco


MID-IR SPECTRA OF TYPE Ia SN 2014J IN M82 SPANNING THE FIRST 4 MONTHS

ASTROPHYSICAL JOURNAL 798 (2015) ARTN 93

CM Telesco, P Hoeflich, D Li, C Alvarez, CM Wright, PJ Barnes, S Fernandez, JH Hough, NA Levenson, N Marinas, C Packham, E Pantin, R Rebolo, P Roche, H Zhang


The nuclear and extended infrared emission of the Seyfert galaxy NGC 2992 and the interacting system Arp 245

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449 (2015) 1309-1326

I Garcia-Bernete, C Ramos Almeida, JA Acosta-Pulido, A Alonso-Herrero, M Sanchez-Portal, M Castillo, M Pereira-Santaella, P Esquej, O Gonzalez-Martin, T Diaz-Santos, P Roche, S Fisher, M Povic, AM Perez Garcia, I Valtchanov, C Packham, NA Levenson


The silicate absorption profile in the interstellar medium towards the heavily obscured nucleus of NGC 4418

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449 (2015) 2598-2603

PF Roche, A Alonso-Herrero, O Gonzalez-Martin


Magnetic field structures in star-forming regions: mid-infrared imaging polarimetry of K3-50

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 453 (2015) 2622-2636

P Barnes, D Li, C Telesco, N Tanakul, N Marinas, C Wright, C Packham, E Pantin, P Roche, J Hough


A mid-infrared view of the inner parsecs of the Seyfert galaxy Mrk 1066 using CanariCam/GTC

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 445 (2014) 1130-1143

C Ramos Almeida, A Alonso-Herrero, P Esquej, O Gonzalez-Martin, RA Riffel, I Garcia-Bernete, JM Rodriguez Espinosa, C Packham, NA Levenson, P Roche, T Diaz-Santos, I Aretxaga, C Alvarez


Nuclear star formation activity and black hole accretion in nearby seyfert galaxies

Astrophysical Journal 780 (2014)

P Esquej, A Alonso-Herrero, O González-Martín, SF Hönig, A Hernán-Caballero, P Roche, C Ramos Almeida, RE Mason, T Díaz-Santos, NA Levenson, I Aretxaga, JM Rodríguez Espinosa, C Packham

Recent theoretical and observational works indicate the presence of a correlation between the star-formation rate (SFR) and active galactic nucleus (AGN) luminosity (and, therefore, the black hole accretion rate, ṀBH) of Seyfert galaxies. This suggests a physical connection between the gas-forming stars on kpc scales and the gas on sub-pc scales that is feeding the black hole. We compiled the largest sample of Seyfert galaxies to date with high angular resolution (∼0.′4-0. ′8) mid-infrared (8-13μm) spectroscopy. The sample includes 29 Seyfert galaxies drawn from the AGN Revised Shapley-Ames catalog. At a median distance of 33 Mpc, our data allow us to probe nuclear regions on scales of∼65 pc (median value).We found no general evidence of suppression of the 11.3μmpolycyclic aromatic hydrocarbon (PAH) emission in the vicinity of these AGN, and we used this feature as a proxy for the SFR.We detected the 11.3μm PAH feature in the nuclear spectra of 45% of our sample. The derived nuclear SFRs are, on average, five times lower than those measured in circumnuclear regions of 600 pc in size (median value). However, the projected nuclear SFR densities (median value of 22M ⊙ yr-1 kpc-2) are a factor of 20 higher than those measured on circumnuclear scales. This indicates that the SF activity per unit area in the central ∼65 pc region of Seyfert galaxies is much higher than at larger distances from their nuclei. We studied the connection between the nuclear SFR and?ṀBH and showed that numerical simulations reproduce our observed relation fairly well. © 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.


Nuclear 11.3 mu m PAH emission in local active galactic nuclei

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 443 (2014) 2766-2782

A Alonso-Herrero, C Ramos Almeida, P Esquej, PF Roche, A Hernan-Caballero, SF Honig, O Gonzalez-Martin, I Aretxaga, RE Mason, C Packham, NA Levenson, JM Rodriguez Espinosa, R Siebenmorgen, M Pereira-Santaella, T Diaz-Santos, L Colina, C Alvarez, CM Telesco


Towards precise ages and masses of Free Floating Planetary Mass Brown Dwarfs

Monthly Notices of the Royal Astronomical Society 435 (2013) 2650-2664

JI Canty, PW Lucas, PF Roche, DJ Pinfield


Uncovering the deeply embedded active galactic nucleus activity in the nuclear regions of the interacting galaxy Arp 299

Astrophysical Journal Letters 779 (2013)

A Alonso-Herrero, PF Roche, P Esquej, O González-Martín, M Pereira-Santaella, C Ramos Almeida, NA Levenson, C Packham, A Asensio Ramos, RE Mason, JM Rodríguez Espinosa, C Alvarez, L Colina, I Aretxaga, T Díaz-Santos, E Perlman, CM Telesco

We present mid-infrared (MIR) 8-13 μm spectroscopy of the nuclear regions of the interacting galaxy Arp 299 (IC 694+NGC 3690) obtained with CanariCam (CC) on the 10.4 m Gran Telescopio Canarias (GTC). The high angular resolution (∼0.″3-0.″6) of the data allows us to probe nuclear physical scales between 60 and 120 pc, which is a factor of 10 improvement over previous MIR spectroscopic observations of this system. The GTC/CC spectroscopy displays evidence of deeply embedded active galactic nucleus (AGN) activity in both nuclei. The GTC/CC nuclear spectrum of NGC 3690/Arp 299-B1 can be explained as emission from AGN-heated dust in a clumpy torus with both a high covering factor and high extinction along the line of sight. The estimated bolometric luminosity of the AGN in NGC 3690 is 3.2 ± 0.6 × 10 44 erg s -1 . The nuclear GTC/CC spectrum of IC 694/Arp 299-A shows 11.3 μm polycyclic aromatic hydrocarbon emission stemming from a deeply embedded (A V ∼ 24 mag) region of less than 120 pc in size. There is also a continuum-emitting dust component. If associated with the putative AGN in IC 694, we estimate that it would be approximately five times less luminous than the AGN in NGC 3690. The presence of dual AGN activity makes Arp 299 a good example to study such phenomena in the early coalescence phase of interacting galaxies. © 2013. The American Astronomical Society. All rights reserved.


The outer wind of γVelorum

Monthly Notices of the Royal Astronomical Society 427 (2012) 581-588

PF Roche, MD Colling, MJ Barlow

Fine-structure mid-infrared emission lines with critical densities in the regime 10 4 ≤ n crit ≤ 10 6 cm -3 can be employed to probe the outflow from Wolf-Rayet (WR) stars at radii of ~10 15 cm. Narrow-band mid-infrared imaging and spectroscopy of the nearest WR star to the Sun, γVelorum is analysed for spatially resolved forbidden line emission in the WR outer wind. The [Siv] 10.52-μm and [Neii] 12.81-μm emission regions are found to be spatially extended, compared to unresolved continuum and He and C recombination line emission. The [Siv] and [Neii] emission line distributions have a high degree of azimuthal symmetry, indicating a spherically symmetric outflow. A model wind with a modest degree of clumping (clumping factor f ~ 10) provides a better match to the observations than an unclumped model. The overall line intensity distributions are consistent with a freely expanding, spherically symmetric 1/r 2 outflow with constant ionization fraction and modestly clumped density structure. © 2012 The Authors Monthly Notices of the Royal Astronomical Society. © 2012 RAS.


THE NUCLEAR INFRARED EMISSION OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI

ASTRONOMICAL JOURNAL 144 (2012) ARTN 11

RE Mason, E Lopez-Rodriguez, C Packham, A Alonso-Herrero, NA Levenson, J Radomski, C Ramos Almeida, L Colina, M Elitzur, I Aretxaga, PF Roche, N Oi


The nuclear infrared emission of low-luminosity AGN

Journal of Physics: Conference Series 372 (2012)

RE Mason, E Lopez-Rodriguez, C Packham, A Alonso-Herrero, NA Levenson, J Radomski, CR Almeida, L Colina, M Elitzur, I Arextaga, PF Roche, N Oi

We have obtained high-resolution mid-infrared (MIR) imaging, nuclear spectral energy distributions (SEDs) and archival Spitzer spectra for 22 low-luminosity active galactic nuclei (LLAGN; L bol < 5 × 10 42 erg s -1 ). Infrared (IR) observations may advance our understanding of the accretion ows in LLAGN, the fate of the obscuring torus at low accretion rates, and, perhaps, the star formation histories of these objects. However, while comprehensively studied in higher-luminosity Seyferts and quasars, the nuclear IR properties of LLAGN have not yet been well-determined. In these proceedings we summarise the results for the LLAGN at the relatively high-luminosity, high-Eddington ratio end of the sample. Strong, compact nuclear sources are visible in the MIR images of these objects, with luminosities consistent with or slightly in execss of that predicted by the standard MIR/X-ray relation. Their broadband nuclear SEDs are diverse; some resemble typical Seyfert nuclei, while others possess less of a well-defined MIR "dust bump". Strong silicate emission is present in many of these objects. We speculate that this, together with high ratios of silicate strength to hydrogen column density, could suggest optically thin dust and low dust-to-gas ratios, in accordance with model predictions that LLAGN do not host a Seyfert-like obscuring torus.

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