Zobrazeno 1 - 10
of 1 204
pro vyhledávání: '"Houck, J."'
Autor:
Corrales, L., Baganoff, F. K., Wang, Q. D., Nowak, M., Neilsen, J., Markoff, S., Haggard, D., Davis, J., Houck, J., Principe, D.
In quiescence, Sgr A* is surprisingly dim, shining 100,000 times less than expected for its environment. This problem has motivated a host of theoretical models to explain radiatively inefficient accretion flows (RIAFs). The Chandra Galactic Center (
Externí odkaz:
http://arxiv.org/abs/2002.07198
CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution observations
Autor:
Lebouteiller, V., Barry, D. J., Goes, C., Sloan, G. C., Spoon, H. W. W., Weedman, D. W., Bernard-Salas, J., Houck, J. R.
Publikováno v:
Lebouteiller et al., 2015, ApJS 218, 21
The Infrared Spectrograph (IRS) on board the Spitzer Space Telescope observed about 15,000 objects during the cryogenic mission lifetime. Observations provided low-resolution (R~60-127) spectra over ~5-38um and high-resolution (R~600) spectra over ~1
Externí odkaz:
http://arxiv.org/abs/1506.07610
Autor:
Allen, G. E., Chow, K., DeLaney, T., Filipovic, M. D., Houck, J. C., Pannuti, T. G., Stage, M. D.
An analysis of Chandra ACIS data for two relatively bright and narrow portions of the northwestern rim of G266.2-1.2 (a.k.a. RX J0852.0-4622 or Vela Jr.) reveal evidence of a radial displacement of 2.40 +/- 0.56 arcsec between 2003 and 2008. The corr
Externí odkaz:
http://arxiv.org/abs/1410.7435
We present spectra obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope of 33 K giants and 20 A dwarfs to assess their suitability as spectrophotometric standard stars. The K giants confirm previous findings that the strength
Externí odkaz:
http://arxiv.org/abs/1408.5922
Autor:
Neilsen, J., Nowak, M. A., Gammie, C., Dexter, J., Markoff, S., Haggard, D., Nayakshin, S., Wang, Q. D., Grosso, N., Porquet, D., Tomsick, J. A., Degenaar, N., Fragile, P. C., Houck, J. C., Wijnands, R., Miller, J. M., Baganoff, F. K.
Over the last decade, X-ray observations of Sgr A* have revealed a black hole in a deep sleep, punctuated roughly once per day by brief flares. The extreme X-ray faintness of this supermassive black hole has been a long-standing puzzle in black hole
Externí odkaz:
http://arxiv.org/abs/1311.6818
Autor:
Wang, Q. D., Nowak, M. A., Markoff, S. B., Baganoff, F. K., Nayakshin, S., Yuan, F., Cuadra, J., Davis, J., Dexter, J., Fabian, A. C., Grosso, N., Haggard, D., Houck, J., Ji, L., Li, Z., Neilsen, J., Porquet, D., Ripple, F., Shcherbakov, R. V.
Publikováno v:
Science 30 August 2013: Vol. 341 no. 6149 pp. 981-983
Most supermassive black holes (SMBHs) are accreting at very low levels and are difficult to distinguish from the galaxy centers where they reside. Our own Galaxy's SMBH provides a uniquely instructive exception, and we present a close-up view of its
Externí odkaz:
http://arxiv.org/abs/1307.5845
Autor:
Nowak, M. A., Neilsen, J., Markoff, S. B., Baganoff, F. K., Porquet, D., Grosso, N., Levin, Y., Houck, J., Eckart, A., Falcke, H., Ji, L., Miller, J. M., Wang, Q. D.
Starting in 2012, we began an unprecedented observational program focused on the supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy Transmission Gratings Spectrometer (HETGS) instrument on the Chandra X-ray Observa
Externí odkaz:
http://arxiv.org/abs/1209.6354
We present Spitzer IRS spectra of four carbon stars located in the Galactic Halo and the thick disc. The spectra display typical features of carbon stars with SiC dust emission and C$_2$H$_2$ molecular absorption. Dust radiative transfer models and i
Externí odkaz:
http://arxiv.org/abs/1208.1306
Autor:
Sargsyan, L., Lebouteiller, V., Weedman, D., Spoon, H., Bernard-Salas, J., Engels, D., Stacey, G., Houck, J., Barry, D., Miles, J., Samsonyan, A.
Results are presented for [CII] 158 micron line fluxes observed with the Herschel PACS instrument in 112 sources with both starburst and AGN classifications, of which 102 sources have confident detections. Results are compared with mid-infrared spect
Externí odkaz:
http://arxiv.org/abs/1206.5435
Autor:
Lebouteiller, V., Barry, D. J., Spoon, H. W. W., Bernard-Salas, J., Sloan, G. C., Houck, J. R., Weedman, D. W.
We present the spectral atlas of sources observed in low resolution with the Infrared Spectrograph on board the Spitzer Space Telescope. More than 11,000 distinct sources were extracted using a dedicated algorithm based on the SMART software with an
Externí odkaz:
http://arxiv.org/abs/1108.3507