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Your search keyword '"González-Martín, O."' showing total 26 results
Start Over Author "González-Martín, O." Publication Year Range Last 50 years Publisher edp sciences
26 results on '"González-Martín, O."'

1. The Galaxy Activity, Torus, and Outflow Survey (GATOS)

Author

García-Bernete, I., primary, Alonso-Herrero, A., additional, Rigopoulou, D., additional, Pereira-Santaella, M., additional, Shimizu, T., additional, Davies, R., additional, Donnan, F. R., additional, Roche, P. F., additional, González-Martín, O., additional, Ramos Almeida, C., additional, Bellocchi, E., additional, Boorman, P., additional, Combes, F., additional, Efstathiou, A., additional, Esparza-Arredondo, D., additional, García-Burillo, S., additional, González-Alfonso, E., additional, Hicks, E. K. S., additional, Hönig, S., additional, Labiano, A., additional, Levenson, N. A., additional, López-Rodríguez, E., additional, Ricci, C., additional, Packham, C., additional, Rouan, D., additional, Stalevski, M., additional, and Ward, M. J., additional

Published
2023
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2. Multiphase characterization of AGN winds in five local type-2 quasars

Author

Speranza, G., primary, Ramos Almeida, C., additional, Acosta-Pulido, J.A., additional, Audibert, A., additional, Holden, L.R., additional, Tadhunter, C.N., additional, Lapi, A., additional, González-Martín, O., additional, Brusa, M., additional, López, I.E., additional, Musiimenta, B., additional, and Shankar, F., additional

Published
2023
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3. Absence of nuclear polycyclic aromatic hydrocarbon emission from a compact starburst: The case of the type-2 quasar Mrk 477

Author

Ramos Almeida, C., primary, Esparza-Arredondo, D., additional, González-Martín, O., additional, García-Bernete, I., additional, Pereira-Santaella, M., additional, Alonso-Herrero, A., additional, Acosta-Pulido, J. A., additional, Bessiere, P. S., additional, Levenson, N. A., additional, Tadhunter, C. N., additional, Rigopoulou, D., additional, Martínez-Paredes, M., additional, Cazzoli, S., additional, and García-Lorenzo, B., additional

Published
2023
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4. Torus and polar dust dependence on active galactic nucleus properties

Author

García-Bernete, I., primary, González-Martín, O., additional, Ramos Almeida, C., additional, Alonso-Herrero, A., additional, Martínez-Paredes, M., additional, Ward, M. J., additional, Roche, P. F., additional, Acosta-Pulido, J. A., additional, López-Rodríguez, E., additional, Rigopoulou, D., additional, and Esparza-Arredondo, D., additional

Published
2022
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5. The Galaxy Activity, Torus, and Outflow Survey (GATOS)

Author

Alonso-Herrero, A., primary, García-Burillo, S., additional, Hönig, S. F., additional, García-Bernete, I., additional, Ramos Almeida, C., additional, González-Martín, O., additional, López-Rodríguez, E., additional, Boorman, P. G., additional, Bunker, A. J., additional, Burtscher, L., additional, Combes, F., additional, Davies, R., additional, Díaz-Santos, T., additional, Gandhi, P., additional, García-Lorenzo, B., additional, Hicks, E. K. S., additional, Hunt, L. K., additional, Ichikawa, K., additional, Imanishi, M., additional, Izumi, T., additional, Labiano, A., additional, Levenson, N. A., additional, Packham, C., additional, Pereira-Santaella, M., additional, Ricci, C., additional, Rigopoulou, D., additional, Roche, P., additional, Rosario, D. J., additional, Rouan, D., additional, Shimizu, T., additional, Stalevski, M., additional, Wada, K., additional, and Williamson, D., additional

Published
2021
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6. The Galaxy Activity, Torus, and Outflow Survey (GATOS)

Author

García-Burillo, S., primary, Alonso-Herrero, A., additional, Ramos Almeida, C., additional, González-Martín, O., additional, Combes, F., additional, Usero, A., additional, Hönig, S., additional, Querejeta, M., additional, Hicks, E. K. S., additional, Hunt, L. K., additional, Rosario, D., additional, Davies, R., additional, Boorman, P. G., additional, Bunker, A. J., additional, Burtscher, L., additional, Colina, L., additional, Díaz-Santos, T., additional, Gandhi, P., additional, García-Bernete, I., additional, García-Lorenzo, B., additional, Ichikawa, K., additional, Imanishi, M., additional, Izumi, T., additional, Labiano, A., additional, Levenson, N. A., additional, López-Rodríguez, E., additional, Packham, C., additional, Pereira-Santaella, M., additional, Ricci, C., additional, Rigopoulou, D., additional, Rouan, D., additional, Shimizu, T., additional, Stalevski, M., additional, Wada, K., additional, and Williamson, D., additional

Published
2021
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7. Multiphase feedback processes in the Sy2 galaxy NGC 5643

Author

García-Bernete, I., primary, Alonso-Herrero, A., additional, García-Burillo, S., additional, Pereira-Santaella, M., additional, García-Lorenzo, B., additional, Carrera, F. J., additional, Rigopoulou, D., additional, Ramos Almeida, C., additional, Villar Martín, M., additional, González-Martín, O., additional, Hicks, E. K. S., additional, Labiano, A., additional, Ricci, C., additional, and Mateos, S., additional

Published
2020
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8. Cold molecular gas and PAH emission in the nuclear and circumnuclear regions of Seyfert galaxies

Author

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

Published
2020
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12. Nuclear obscuration in LINERs

Author

González-Martín, O., primary, Masegosa, J., additional, Márquez, I., additional, Rodríguez-Espinosa, J. M., additional, Acosta-Pulido, J. A., additional, Ramos Almeida, C., additional, Dultzin, D., additional, Hernández-García, L., additional, Ruschel-Dutra, D., additional, and Alonso-Herrero, A., additional

Published
2015
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14. Synapses of active galactic nuclei

Author

González-Martín, O., primary, Díaz-González, D., additional, Acosta-Pulido, J. A., additional, Masegosa, J., additional, Papadakis, I. E., additional, Rodríguez-Espinosa, J. M., additional, Márquez, I., additional, and Hernández-García, L., additional

Published
2014
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15. TheXMM-NewtonWide Angle Survey (XWAS)

Author

Esquej, P., primary, Page, M., additional, Carrera, F. J., additional, Mateos, S., additional, Tedds, J., additional, Watson, M. G., additional, Corral, A., additional, Ebrero, J., additional, Krumpe, M., additional, Rosen, S. R., additional, Ceballos, M. T., additional, Schwope, A., additional, Page, C. G., additional, Alonso-Herrero, A., additional, Caccianiga, A., additional, Della Ceca, R., additional, González-Martín, O., additional, Lamer, G., additional, and Severgnini, P., additional

Published
2013
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17. Dust in active galactic nuclei

Author

González-Martín, O., primary, Rodríguez-Espinosa, J. M., additional, Díaz-Santos, T., additional, Packham, C., additional, Alonso-Herrero, A., additional, Esquej, P., additional, Ramos Almeida, C., additional, Mason, R., additional, and Telesco, C., additional

Published
2013
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18. X-ray long-term variations in the low-luminosity AGN NGC835 and its circumnuclear emission.

Author

González-Martín, O., Hernández-García, L., Masegosa, J., Márquez, I., Rodríguez-Espinosa, J. M., Acosta-Pulido, J. A., Alonso-Herrero, A., Dultzin, D., and Arredondo, D. Esparza

Subjects
*LUMINOSITY, *ACTIVE galactic nuclei, *EMISSIONS (Air pollution), *INFRARED spectra, *SUPERMASSIVE black holes
Abstract

Context. Obscured active galactic nuclei (AGNs) are thought to be very common in the Universe. Observations and surveys have shown that the number of sources increases for near galaxies and at the low-luminosity regime (the so-called LLAGNs). Furthermore, many AGNs show changes in their obscuration properties at X-rays that may suggest a configuration of clouds very close to the accretion disk. However, these variations could also be due to changes in the intrinsic continuum of the source. It is therefore important to study nearby AGN to better understand the locus and distribution of clouds in the neighbourhood of the nucleus. Aims. We aim to study the nuclear obscuration of LLAGN NGC835 and its extended emission using mid-infrared observations. Methods. We present sub-arcsecond-resolution mid-infrared 11.5 µm imaging of the LLAGN galaxy NGC835 obtained with the instrument CanariCam in the Gran Telescopio CANARIAS (GTC), archival Spitzer/IRS spectroscopy, and archival Chandra data observed in 2000, 2008, and 2013. Results. The GTC/CanariCam 11.5 µm image reveals faint extended emission out to ~6 arcsec. We obtained a nuclear flux of F(11:5 µm) ~ 18 mJy; whereas the extended emission accounts for 90% of the total flux within the 6 arcsec. This means that the low angular resolution (~4 arcsec) IRS spectrum is dominated by this extended emission and not by the AGN. This is clearly seen in the Spitzer/IRS spectrum, which resembles that of star-forming galaxies. Although the extended soft X-ray emission shows some resemblance with that of the mid-infrared, the knots seen at X-rays are mostly located in the inner side of this mid-infrared emission. The nuclear X-ray spectrum of the source has undergone a spectral change between 2000/2008 and 2013. We argue that this variation is most probably due to changes in the hydrogen column density from ~8 × 1023 cm–2 to ~3 × 1023 cm–2. NGC835 therefore is one of the few LLAGN, together with NGC1052, in which changes in the absorber can be claimed. [ABSTRACT FROM AUTHOR]

Published
2016
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20. Suzakuobservation of the LINER NGC 4102

Author

González-Martín, O., primary, Papadakis, I., additional, Braito, V., additional, Masegosa, J., additional, Márquez, I., additional, Mateos, S., additional, Acosta-Pulido, J. A., additional, Martínez, M. A., additional, Ebrero, J., additional, Esquej, P., additional, O’Brien, P., additional, Tueller, J., additional, Warwick, R. S., additional, and Watson, M. G., additional

Published
2011
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25. The XMM-Newton Wide Angle Survey (XWAS).

Author

Esquej, P., Page, M., Carrera, F. J., Mateos, S., Tedds, J., Watson, M. G., Corral, A., Ebrero, J., Krumpe, M., Rosen, S. R., Ceballos, M. T., Schwope, A., Page, C. G., Alonso-Herrero, A., Caccianiga, A., Ceca, R. Della, González-Martín, O., Lamer, G., and Severgnini, P.

Subjects
GALACTIC nuclei, GALACTIC X-ray sources, SPECTRUM analysis, REDSHIFT, PHOTOMETRY
Abstract

Aims. This programme is aimed at obtaining one of the largest X-ray selected samples of identified active galactic nuclei to date in order to characterise such a population at intermediate fluxes, where most of the Universe's accretion power originates.We present the XMM-NewtonWide Angle Survey (XWAS), a new catalogue of almost a thousand X-ray sources spectroscopically identified through optical observations. Methods. A sample of X-ray sources detected in 68 XMM-Newton pointed observations was selected for optical multi-fibre spectroscopy. Optical counterparts and corresponding photometry of the X-ray sources were obtained from the SuperCOSMOS Sky Survey. Candidates for spectroscopy were initially selected with magnitudes down to R ~ 21, with preference for X-ray sources having a flux F0.5-4.5keV ⩾ 10-14 erg s-1 cm-2. Optical spectroscopic observations were made using the Two Degree Field of the Anglo Australian Telescope, and the resulting spectra were classified based on optical emission lines. Results. We have identified through optical spectroscopy 940 X-ray sources over Ω ~ 11.8 deg2 of the sky. Source populations in our sample can be summarised as 65% broad line active galactic nuclei (BLAGN), 16% narrow emission line galaxies (NELGs), 6% absorption line galaxies (ALGs) and 13% stars. An active nucleus is also likely to be present in the large majority of the X-ray sources spectroscopically classified as NELGs or ALGs. Sources lie in high-galactic latitude (∣b∣ > 20 deg) XMM-Newton fields mainly in the southern hemisphere. Owing to the large parameter space in redshift (0 ⩽ z ⩽ 4.25) and flux (10-15 ⩽ F0.5-4.5keV ⩽ 10-12 erg s-1 cm-2) covered by the XWAS this work provides an excellent resource for the further study of subsamples and particular cases. The overall properties of the extragalactic objects are presented in this paper. These include the redshift and luminosity distributions, optical and X-ray colours and X-ray-to-optical flux ratios. [ABSTRACT FROM AUTHOR]

Published
2013
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26. X-ray spectral variability of seven LINER nuclei with XMM-Newton and Chandra data.

Author

Hernández-García, L., González-Martín, O., Márquez, I., and Masegosa, J.

Subjects
*ACTIVE galactic nuclei, *X-ray spectra, *RADIO frequency, *ADVECTION
Abstract

Context. One of the most distinctive features in active galactic nuclei (AGN) is the variability of their emission. Variability has been discovered at X-ray, UV, and radio frequencies on timescales from hours to years. Among the AGN family and according to theoretical studies, low-ionization nuclear emission line region (LINER) nuclei would be objects variable on long timescales. Aims. Our purpose is to investigate spectral X-ray variability in LINERs and to understand the nature of these types of objects, as well as their accretion mechanism. Methods. Chandra and XMM-Newton public archives were used to compile X-ray spectra of seven LINER nuclei at different epochs with timescales of years. To search for variability we fit all spectra from the same object with a set of models to identify the parameters responsible for the variability pattern. We also analyzed the light curves to search for short timescale (from hours to days) variability. Whenever possible, UV variability was also studied. Results. We found spectral variability in four objects (NGC1052, NGC3226, NGC4278, and NGC4552), with variations mostly related to hard energies (2-10 keV). These variations are generated by several possible changes that act either alone or in combination: changes in the soft excess or in the absorber. Added to this can be intrinsic variations of the source, which may also be responsible by themselves for the spectral variability. These variations occurred within years, the shortest timescale being found for NGC4278 (two months). Another two galaxies (NGC4261 and NGC 5846) apparently do not vary. No short timescale variations during individual observations were found. Our analysis confirms the previously reported anticorrelation between the X-ray spectral index, Γ, and the Eddington ratio, Lbol/LEdd, and also the correlation between the X-ray to UV flux ratio, αox, and the Eddington ratio, Lbol/LEdd. These results support an advection dominated accretion flow as the accretion mechanism in LINERs. [ABSTRACT FROM AUTHOR]

Published
2013
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