Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Roy Kilgard"'
Autor:
Girish M. Duvvuri, P. Wilson Cauley, Fernando Cruz Aguirre, Roy Kilgard, Kevin France, Zachory K. Berta-Thompson, J. Sebastian Pineda
Publikováno v:
The Astronomical Journal, Vol 166, Iss 5, p 196 (2023)
V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work pieces together observations from the NICER X-ray telescope, the Space Teles
Externí odkaz:
https://doaj.org/article/93aa134c36db4c4ab53ca52ae6fd4754
Mrk 1018 is a "changing-look" AGN whose optical spectrum transitioned from a Type 1.9 to Type 1 between 1979 and 1984 and back to a Type 1.9 in 2015. This latest transition was accompanied by a decrease in X-ray flux. We analyze the Chandra spectra f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bad56b0e2dad15ed6c2a9cdd47d072a2
http://arxiv.org/abs/1703.07410
http://arxiv.org/abs/1703.07410
Publikováno v:
The Astrophysical Journal. 705:1632-1636
X-ray sources in spiral galaxies can be approximately classified into bulge and disk populations. The bulge (or hard) sources have X-ray colors which are consistent with Low Mass X-ray Binaries (LMXB) but the the disk sources have softer colors sugge
Autor:
Andrea Prestwich, Christina K. Lacey, Chris Stockdale, John J. Cowan, L. A. Maddox, E. Wolfing, Roy Kilgard
Publikováno v:
The Astronomical Journal. 132:310-320
We present analyses of deep radio observations of M83 taken with the Very Large Array spanning fifteen years, including never before published observations from 1990 and 1998. We report on the evolution of 55 individual point sources, which include f
Autor:
Eduardo Gonzalez-Solares, S. Berta, Andreas Efstathiou, Thomas H. Jarrett, Maria del Carmen Polletta, Tom Babbedge, Carol J. Lonsdale, Fan Fang, G. E. Morrison, Gordon J. Stacey, Dong-Woo Kim, Frazer N. Owen, Harding E. Smith, Jason Surace, David L. Shupe, Roy Kilgard, Belinda Jane Wilkes, Alberto Franceschini, Michael Rowan-Robinson, Brian Siana, Duncan Farrah
Publikováno v:
The Astrophysical Journal. 642:673-693
Using the large multi-wavelength data set in the chandra/SWIRE Survey (0.6 square degrees in the Lockman Hole), we show evidence for the existence of highly obscured (Compton-thick) AGN, estimate a lower limit to their surface density and characteriz
Publikováno v:
Proceedings of the International Astronomical Union. 1:189-192
The X-ray populations of spiral galaxies consist almost entirely of accreting X-ray binaries and supernova remnants. For the most luminous sources, it is possible to use X-ray spectroscopy and variability studies to gain insights into the nature of t
Autor:
Jonathan C. McDowell, Roy Kilgard, Philip Kaaret, G. Trinchieri, Michael R. Garcia, Andreas Zezas, Martin Ward, M. I. Krauss, F. A. Primini, Andrea Prestwich, Chris Stockdale, John J. Cowan
Publikováno v:
The Astrophysical Journal Supplement Series. 159:214-241
Emission from discrete point sources dominates the X-ray luminosity in spiral galaxies. We present results from a survey of 11 nearby, nearly face-on spiral galaxies with the Chandra X-ray Observatory. These galaxies span the Hubble sequence for spir
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 357:401-419
We present the global X-ray properties of the point source population in the grand-design spiral galaxy M101, as seen with XMM-Newton. 108 X-ray sources are detected within the D25 ellipse of M101, of which ~24 are estimated to be background sources.
Chandra High-Resolution Camera observations of the luminous X-ray source in the starburst galaxy M82
Autor:
Dong-Woo Kim, Andreas Zezas, Andrea Prestwich, Philip Kaaret, Roy Kilgard, Eric M. Schlegel, Stephen S. Murray, Martin Ward
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 321:L29-L32
We have analyzed Chandra High Resolution Camera observations of the starburst galaxy M82, concentrating on the most luminous x-ray source. We find a position for the source of $\rm R.A. = 09^h 55^m 50^s.2, decl. = +69^{\circ} 40\arcmin 46\arcsec.7$ (
Autor:
Andrea Prestwich, S. S. Murray, Eric M. Schlegel, Andreas Zezas, Paulina Lira, Roy Kilgard, Philip Kaaret, Martin Ward, Dong-Woo Kim
Publikováno v:
Symposium - International Astronomical Union. 205:208-211
We present high resolution Chandra X-ray imaging of two starburst galaxies, M82 and NGC 3256. The central x-ray source observed by ROSAT and ASCA in M82 is resolved into 3 or 4 sources. Most of these sources are variable, suggesting that the point so