Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Aldcroft, Tom"'
Autor:
Kashyap, Vinay L., Guarcello, Mario G., Wright, Nicholas J., Drake, Jeremy J., Flaccomio, Ettore, Aldcroft, Tom L., Colombo, Juan F. Albacete, Briggs, Kevin, Damiani, Francesco, Drew, Janet E., Martin, Eduardo L., Micela, Giusi, Naylor, Tim, Sciortino, Salvatore
We have devised a predominantly Naive Bayes method to classify the optical/IR matches to X-ray sources detected by Chandra in the Cygnus OB2 association into foreground, member, and background objects. We employ a variety of X-ray, optical, and infra
Externí odkaz:
http://arxiv.org/abs/2306.06832
Autor:
Wright, Nicholas J., Drake, Jeremy J., Guarcello, Mario G., Aldcroft, Tom L., Kashyap, Vinay L., Damiani, Francesco, DePasquale, Joe, Fruscione, Antonella
The Cygnus OB2 association is the largest concentration of young and massive stars within 2 kpc of the Sun, including an estimated 65 O-type stars and hundreds of OB stars. The Chandra Cygnus OB2 Legacy Survey is a large imaging program undertaken wi
Externí odkaz:
http://arxiv.org/abs/1408.6579
Akademický článek
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Autor:
The Astropy Collaboration, Robitaille, Thomas P., Tollerud, Erik J., Greenfield, Perry, Droettboom, Michael, Bray, Erik, Aldcroft, Tom, Davis, Matt, Ginsburg, Adam, Price-Whelan, Adrian M., Kerzendorf, Wolfgang E., Conley, Alexander, Crighton, Neil, Barbary, Kyle, Muna, Demitri, Ferguson, Henry, Grollier, Frédéric, Parikh, Madhura M., Nair, Prasanth H., Günther, Hans M., Deil, Christoph, Woillez, Julien, Conseil, Simon, Kramer, Roban, Turner, James E. H., Singer, Leo, Fox, Ryan, Weaver, Benjamin A., Zabalza, Victor, Edwards, Zachary I., Bostroem, K. Azalee, Burke, D. J., Casey, Andrew R., Crawford, Steven M., Dencheva, Nadia, Ely, Justin, Jenness, Tim, Labrie, Kathleen, Lim, Pey Lian, Pierfederici, Francesco, Pontzen, Andrew, Ptak, Andy, Refsdal, Brian, Servillat, Mathieu, Streicher, Ole
We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the community, including support for domain-specific file formats such as Fle
Externí odkaz:
http://arxiv.org/abs/1307.6212
Autor:
Trichas, Markos, Green, Paul, Constantin, Anca, Aldcroft, Tom, Sobolewska, Malgosia, Hyde, Ashley K., Zhou, Hongyan, Kim, Dong-Woo, Haggard, Daryl, Kelly, Brandon, Kalfountzou, Eleni
Striking similarities have been seen between accretion signatures of Galactic X-ray binary (XRB) systems and active galactic nuclei (AGN). XRB spectral states show a V-shaped correlation between X-ray spectral hardness and Eddington ratio as they var
Externí odkaz:
http://arxiv.org/abs/1306.0594
Autor:
Trichas, Markos, Green, Paul J., Silverman, John D., Aldcroft, Tom, Barkhouse, Wayne, Cameron, Robert A., Constantin, Anca, Ellison, Sara L., Foltz, Craig, Haggard, Daryl, Jannuzi, Buell T., Kim, Dong-Woo, Marshall, Herman L., Mossman, Amy, Perez, Laura M., Romero-Colmenero, Encarni, Ruiz, Angel, Smith, Malcolm G., Smith, Paul S., Torres, Guillermo, Wik, Daniel R., Wilkes, Belinda J., Wolfgang, Angie
From optical spectroscopy of X-ray sources observed as part of ChaMP, we present redshifts and classifications for a total of 1569 Chandra sources from our targeted spectroscopic follow up using the FLWO, SAAO, WIYN, CTIO, KPNO, Magellan, MMT and Gem
Externí odkaz:
http://arxiv.org/abs/1204.5148
Broad absorption line (BAL) quasars probe the high velocity gas ejected by luminous accreting black holes. BAL variability timescales place constraints on the size, location, and dynamics of the emitting and absorbing gas near the supermassive black
Externí odkaz:
http://arxiv.org/abs/1201.2895
Autor:
Haggard, Daryl, Green, Paul J., Anderson, Scott F., Constantin, Anca, Aldcroft, Tom L., Kim, Dong-Woo, Barkhouse, Wayne A.
We employ the Chandra Multiwavelength Project (ChaMP) and the Sloan Digital Sky Survey (SDSS) to study the fraction of X-ray-active galaxies in the field out to z = 0.7. We utilize spectroscopic redshifts from SDSS and ChaMP, as well as photometric r
Externí odkaz:
http://arxiv.org/abs/1004.1638
Autor:
Constantin, Anca, Green, Paul, Aldcroft, Tom, Kim, Dong-Woo, Haggard, Daryl, Barkhouse, Wayne, Anderson, Scott F.
Publikováno v:
Astrophys.J.705:1336-1355,2009
The combination of the SDSS and the Chandra Multiwavelength Project (ChaMP) currently offers the largest and most homogeneously selected sample of nearby galaxies for investigating the relation between X-ray nuclear emission, nebular line-emission, b
Externí odkaz:
http://arxiv.org/abs/0909.4086
Autor:
Kelly, Brandon C., Bechtold, Jill, Siemiginowska, Aneta, Aldcroft, Tom, Sobolewska, Malgorzata
Publikováno v:
Astrophys.J.657:116-134,2007
We report new Chandra observations of seven optically faint, z \sim 4 radio-quiet quasars. We have combined these new observations with previous Chandra observations of radio-quiet quasars to create a sample of 174 sources. These sources have 0.1 < z
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611120