Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Thomas L. Aldcroft"'
Autor:
John S. Mulchaey, Wayne A. Barkhouse, Adam D. Myers, Vardha N. Bennert, Thomas J. Cox, Paul J. Green, J. M. Wrobel, Thomas L. Aldcroft
Publikováno v:
The Astrophysical Journal. 710:1578-1588
We present the first luminous, spatially resolved binary quasar that clearly inhabits an ongoing galaxy merger. SDSS J125455.09+084653.9 and SDSS J125454.87+084652.1 (SDSS J1254+0846 hereafter) are two luminous z=0.44 radio quiet quasars, with a radi
Autor:
Angela Bongiorno, Stefanie Komossa, P. Esquej, Mara Salvato, Hernan Quintana, Marco Ajello, Paola Rebusco, C. Clemens, Jochen Greiner, Thomas L. Aldcroft, Nico Cappelluti
Publikováno v:
Astronomy & Astrophysics
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Tidal disruption events are possible sources of temporary nuclear activity in galactic nuclei and can be considered as good indicators of the existence of super massive black holes in the centers of galaxies. A new X-ray source has been serendipitous
Publikováno v:
The Astrophysical Journal. 684:811-821
We present {\it Chandra} X-ray Observatory observations of Giga-Hertz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources. The {\it Chandra} sample contains 13 quasars and 3 galaxies with measured 2-10 keV X-ray luminosity within $10
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 349:1261-1266
We report on new multiwavelength observations of HS 1216+5032, a pair of quasi-stellar objects (QSOs) at z = 1.45 separated by 9.1 arcsec, which has been a perennial candidate for a massive dark lens. We explore high signal-to-noise ratio optical spe
Autor:
Aneta Siemiginowska, Carlo Stanghellini, Thomas L. Aldcroft, Martin Elvis, Jill Bechtold, Gianfranco Brunetti
Publikováno v:
Publications of the Astronomical Society of Australia. 20:113-117
The high spatial resolution of the Chandra X-ray Observatory allows us to study the environment of GPS/CSS sources to within an arcsec of the strong compact core. We present the discovery of X-ray jets in two GPS quasars, PKS1127–145 and B2 0738+31
Autor:
Ian Evans, Paul J. Green, Thomas L. Aldcroft, Karl Forster, Joanna Kuraszkiewicz, Anuradha Koratkar
Publikováno v:
The Astrophysical Journal Supplement Series. 143:257-276
UV/optical emission lines offer some of the most detailed information obtainable about the intrinsic properties of quasars. Studies of the density, ionization and metal abundance of gas near the accreting black hole are probed through an intriguing b
Autor:
Adam Dobrzycki, Kim-Vy Tran, Jill Bechtold, Brenda Wilden, D. Dobrzycka, Miwa Morita, Thomas L. Aldcroft, Jennifer Scott
Publikováno v:
The Astrophysical Journal Supplement Series. 140:143-238
We analyzed the absorption line spectra of all quasars observed with the high resolution gratings of the Faint Object Spectrograph on board the Hubble Space Telescope. We examined 788 spectra for 334 quasars, and present line lists and identification
Autor:
Aneta Siemiginowska, Martin Elvis, Thomas L. Aldcroft, Adam Dobrzycki, D. E. Harris, Jill Bechtold
Publikováno v:
The Astrophysical Journal. 570:543-556
We have discovered an X-ray jet with Chandra imaging of the z=1.187 radio-loud quasar PKS1127-145. In this paper we present the Chandra X-ray data, follow-up VLA observations, and optical imaging using the HST WFPC2. The X-ray jet contains 273+/-5 ne
Autor:
Raegan L. Johnson-Wilke, Rui Zhao, Ryan Allured, Stephen L. O'Dell, Vincenzo Cotroneo, Rudeger H. T. Wilke, Vanessa Marquez, Paul B. Reid, Thomas L. Aldcroft, Alexey Vikhlinin, Susan Trolier-McKinstry, Daniel A. Schwartz, Stuart McMuldroch, Brian D. Ramsey
Publikováno v:
SPIE Proceedings.
We describe progress in the development of adjustable grazing incidence X-ray optics for 0.5 arcsec resolution cosmic X-ray imaging. To date, no optics technology is available to blend high resolution imaging like the Chandra X-ray Observatory, with
Autor:
Carolyn Atkins, Martin C. Weisskopf, William W. Zhang, Ralf K. Heilmann, Mark L. Schattenburg, Charles F. Lillie, Stuart McMuldroch, Michael E. Graham, Rudeger H. T. Wilke, Raul E. Riveros, Brian D. Ramsey, Jacqueline M. Roche, Ronald F. Elsner, Kiranmayee Kilaru, Kai Wing Chan, Jeffery J. Kolodziejczak, Paul B. Reid, David N. Burrows, Alexey Vikhlinin, Stephen L. O'Dell, Semyon Vaynman, Xiaoli Wang, Jian Cao, Ryan Allured, Timo T. Saha, Thomas L. Aldcroft, Mikhail V. Gubarev, Brandon D. Chalifoux, Daniel A. Schwartz, Susan Trolier-McKinstry, Melville P. Ulmer, Raegan L. Johnson-Wilke, Vincenzo Cotroneo
Publikováno v:
SPIE Proceedings.
The future of x-ray astronomy depends upon development of x-ray telescopes with larger aperture areas (approx. = 3 square meters) and fine angular resolution (approx. = 1 inch). Combined with the special requirements of nested grazing-incidence optic