Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Perez, I."'
This is the first paper of a series aimed to understand the formation and evolution of bars in early-type spirals and their influence in the evolution of the galaxy. Optical long-slit spectra along the major axis of the bar of a sample of 20 galaxies
Externí odkaz:
http://arxiv.org/abs/0812.2586
Autor:
Zurita, A., Perez, I.
Aims: NGC 1530 has one of the strongest bars ever observed and recent star formation sites are distributed across its bar. Our aim is to study the photometric properties of the bar and its HII regions, to elucidate the conditions under which HII regi
Externí odkaz:
http://arxiv.org/abs/0804.1951
Autor:
Wood, M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Byrum, K. L., Chow, Y. C. K., Cui, W., Perez, I. de la Calle, Falcone, A. D., Fegan, S. J., Finley, J. P., Grube, J., Hall, J., Hanna, D., Holder, J., Horan, D., Humensky, T. B., Kieda, D. B., Kildea, J., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., LeBohec, S., Nagai, T., Ong, R. A., Perkins, J. S., Pohl, M., Quinn, J., Rose, H. J., Sembroski, G. H., Vassiliev, V. V., Wagner, R. G., Wakely, S. P., Weekes, T. C., Weinstein, A.
We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray telescope to search for the gamma-ray signature of self-annihilating weakl
Externí odkaz:
http://arxiv.org/abs/0801.1708
Autor:
Bejar, V. J. S., Osorio, M. R. Zapatero, Perez-Garrido, A., Alvarez, C., Martin, E. L., Rebolo, R., Villo-Perez, I., Diaz-Sanchez, A.
We present the discovery of a companion near the deuterium burning mass limit located at a very wide distance, at an angular separation of 4.6+/-0.1 arcsec (projected distance of ~ 670 AU) from UScoCTIO108, a brown dwarf of the very young Upper Scorp
Externí odkaz:
http://arxiv.org/abs/0712.3482
Autor:
Perez, I.
Context: One of the ways to determine the contribution of the dark halo to the gravitational potential of a galaxy is the study of non-circular (streaming) motions and the associated gas shocks in the bar region. These motions, determined by the pote
Externí odkaz:
http://arxiv.org/abs/0710.2855
Autor:
Osorio, M. R. Zapatero, Bejar, V. J. S., Bihain, G., Martin, E. L., Rebolo, R., Villo-Perez, I., Diaz-Sanchez, A., Perez-Garrido, A., Caballero, J. A., Henning, T., Mundt, R., Navascues, D. Barrado y, Bailer-Jones, C. A. L.
(Abridged) The nature of S Ori 70, a faint mid-T type object found towards the direction of the young sigma Orionis cluster, is still under debate. We intend to disentangle whether it is a field brown dwarf or a 3-Myr old planetary-mass member of the
Externí odkaz:
http://arxiv.org/abs/0710.2776
Autor:
Horan, D., Atkins, R. W., Badran, H. M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Byrum, K. L., Celik, O., Chow, Y. C. K., Cogan, P., Cui, W., Daniel, M. K., Perez, I. de la Calle, Dowdall, C., Falcone, A. D., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortin, P., Fortson, L. F., Gillanders, G. H., Grube, J., Gutierrez, K. J., Hall, J., Hanna, D., Holder, J., Hughes, S. B., Humensky, T. B., Kenny, G. E., Kertzman, M., Kieda, D. B., Kildea, J., Krawczynski, H., Krennrich, F., Lang, M. J., LeBohec, S., Maier, G., Moriarty, P., Nagai, T., Ong, R. A., Perkins, J. S., Petry, D., Quinn, J., Quinn, M., Ragan, K., Reynolds, P. T., Rose, H. J., Schroedter, M., Sembroski, G. H., Steele, D., Swordy, S. P., Toner, J. A., Valcarcel, L., Vassiliev, V. V., Wagner, R. G., Wakely, S. P., Weekes, T. C., White, R. J., Williams, D. A.
Publikováno v:
Astrophys.J.655:396-405,2007
Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE component similar to that seen in blazars and plerions, in which the GRB spe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0701281
Aim: The aim is to study the stellar content of the bar region to constrain its formation and evolution. Methods: Line-strength indices in the bar region of a sample of 6 barred galaxies were employed to derive age and metallicity gradients along the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0612159
* Aims. Identify optical counterparts, address uncertain identifications and measure previously unknown redshifts of the host galaxies of candidate GPS radio sources, and study their stellar populations. * Methods. Long slit spectroscopy and deep opt
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611600
Autor:
Perez, I., Freeman, K.
In this paper we test the idea that the low-metallicity hot gas in the centre of NGC 1291 is heated via a dynamical process. In this scenario, the gas from the outer gas-rich ring loses energy through bar-driven shocks and falls to the centre. Heatin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0604377