Now showing items 1-20 of 23

    • BAT Slew Survey (BATSS): Slew Data Analysis for the Swift-BAT Coded Aperture Imaging Telescope 

      Copete, Antonio Julio (2013-03-18)
      The BAT Slew Survey (BATSS) is the first wide-field survey of the hard X-ray sky (15–150 keV) with a slewing coded aperture imaging telescope. Its fine time resolution, high sensitivity and large sky coverage make it ...
    • Cataclysmic Variables Discovered in the Chandra Multi-Wavelength Plane Survey 

      Zhao, Ping; Grindlay, Jonathan E.; Hong, Jaesub; Servillat, M.; van den Berg, M. (Fabrizio Serra editore, 2013)
      We present 25 cataclysmic variables discovered in the Chandra Multi-wavelength Plane Survey (ChaMPlane: Grindlay et al. (2005); Hong et al. (2005); Zhao et al. (2005)), which is designed to investigate the nature of the ...
    • Chasing the Identification of ASCA Galactic Objects (ChIcAGO) - An X-ray Survey of Unidentified Sources in the Galactic Plane I: Source Sample and Initial Results 

      Anderson, Gemma E.; Gaensler, B. M.; Kaplan, David L.; Slane, Patrick O.; Muno, Michael P.; Posselt, Bettina; Hong, Jaesub; Murray, Stephen S.; Steeghs, Danny T. H.; Brogan, Crystal L.; Drake, Jeremy J.; Farrell, Sean A.; Benjamin, Robert A.; Chakrabarty, Deepto; Drew, Janet E.; Finley, John P.; Grindlay, Jonathan E.; Lazio, T. Joseph W.; Lee, Julia C.; Mauerhan, Jon C.; van Kerkwijk, Marten H. (IOP Publishing, 2014)
      We present the Chasing the Identification of ASCA Galactic Objects (ChIcAGO) survey, which is designed to identify the unknown X-ray sources discovered during the ASCA Galactic Plane Survey (AGPS). Little is known about ...
    • Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae 

      Rivera-Sandoval, L. E.; van den Berg, Maureen C.; Heinke, C. O.; Cohn, H. N.; Lugger, P. M.; Freire, P.; Anderson, J.; Serenelli, A. M.; Althaus, L. G.; Cool, A. M.; Grindlay, Jonathan E.; Edmonds, P. D.; Wijnands, R.; Ivanova, N. (Oxford University Press (OUP), 2015)
      We report the discovery of the likely white dwarf companions to radio millisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae. These blue stars were found in near-ultraviolet images from the Hubble ...
    • Evidence for intermediate polars as the origin of the Galactic Center hard X-ray emission 

      Hailey, Charles J.; Mori, Kaya; Perez, Kerstin; Canipe, Alicia M.; Hong, Jaesub; Tomsick, John A.; Boggs, Steven E.; Christensen, Finn E.; Craig, William W.; Fornasini, Francesca; Grindlay, Jonathan E.; Harrison, Fiona A.; Nynka, Melania; Rahoui, Farid; Stern, Daniel; Zhang, Shuo; Zhang, William W. (American Astronomical Society, 2016)
      Recently, unresolved hard (20–40 keV) X-ray emission has been discovered within the central 10 pc of the Galaxy, possibly indicating a large population of intermediate polars (IPs). Chandra and XMM-Newton measurements in ...
    • Exploring the Long-Term and Extreme Variability of Stars 

      Tang, Sumin (2012-08-23)
      This thesis presents observational studies of long-term and extreme variability of stars with the Digital Access to a Sky Century@Harvard (DASCH) project. Stellar variations over decades are poorly explored. With the unique ...
    • The high resolution X-ray imaging detector planes for the MIRAX mission 

      Rodrigues, Bárbara H. G.; Grindlay, Jonathan E.; Allen, Branden T; Hong, Jaesub; Barthelmy, Scott; Braga, João; D’Amico, Flavio; Rothschild, Richard E. (IOP Publishing, 2013)
      The MIRAX X-ray observatory, the first Brazilian-led astrophysics space mission, is designed to perform an unprecedented wide-field, wide-band hard X-ray (5–200 keV) survey of Galactic X-ray transient sources. In the ...
    • The High-Metallicity Explosion Environment of the Relativistic Supernova 2009bb 

      Levesque, E. M.; Soderberg, Alicia M.; Foley, R. J.; Berger, Edo; Kewley, L. J.; Chakraborti, S.; Ray, A.; Torres, M. A. P.; Challis, P.; Kirshner, R. P.; Barthelmy, S. D.; Bietenholz, M. F.; Chandra, P.; Chaplin, V.; Chevalier, R. A.; Chugai, N.; Connaughton, V.; Copete, Antonio Julio; Fox, O.; Fransson, C.; Grindlay, Jonathan E.; Hamuy, M. A.; Milne, P. A.; Pignata, G.; Stritzinger, M. D.; Wieringa, M. H. (IOP Publishing, 2009)
      We investigate the environment of the nearby (d ≈ 40 Mpc) broad-lined Type Ic supernova SN 2009bb. This event was observed to produce a relativistic outflow likely powered by a central accreting compact object. While such ...
    • How I Learned to Stop Worrying and Love Eclipsing Binaries 

      Moe, Maxwell (2015-09-01)
      Relatively massive B-type stars with closely orbiting stellar companions can evolve to produce Type Ia supernovae, X-ray binaries, millisecond pulsars, mergers of neutron stars, gamma ray bursts, and sources of gravitational ...
    • Identification of a Population of X-Ray-Emitting Massive Stars in the Galactic Plane 

      Anderson, Gemma E.; Gaensler, Bryan M.; Kaplan, David L.; Posselt, Bettina; Slane, Patrick O.; Murray, Stephen S.; Mauerhan, Jon C.; Benjamin, Robert A.; Brogan, Crystal L.; Chakrabarty, Deepto; Drake, Jeremy J.; Drew, Janet E.; Grindlay, Jonathan E.; Hong, Jaesub; Lazio, T. Joseph W.; Lee, Julia C.; Steeghs, Danny T. H.; van Kerkwijk, Marten H. (IOP Publishing, 2011)
      We present X-ray, infrared, optical, and radio observations of four previously unidentified Galactic plane X-ray sources: AX J163252-4746, AX J184738-0156, AX J144701-5919, and AX J144547-5931. Detection of each source ...
    • Imaging Analysis of the Hard X-ray Telescope ProtoEXIST2 and New Techniques for High Resolution Coded Aperture Telescopes 

      Hong, Jaesub; Allen, Branden T; Grindlay, Jonathan E.; Barthelmy, Scott (American Astronomical Society, 2016)
      Wide-field (& 100 deg2) hard X-ray coded-aperture telescopes with high angular resolution (. 20) will enable a wide range of time domain astrophysics. For instance, transient sources such as gammaray bursts can be precisely ...
    • Improved Mass and Radius Constraints for Quiescent Neutron Stars in Omega Cen and NGC 6397 

      Heinke, C. O.; Cohn, H. N.; Lugger, P. M.; Webb, N. A.; Ho, W. C. G.; Anderson, J.; Campana, S.; Bogdanov, S.; Haggard, D.; Cool, A. M.; Grindlay, Jonathan E. (Oxford University Press (OUP), 2014)
      We use Chandra and XMM–Newton observations of the globular clusters ω Cen and NGC 6397 to measure the spectrum of their quiescent neutron stars (NSs), and thus to constrain the allowed ranges of mass and radius for each. ...
    • Improved Photometry for the DASCH Pipeline 

      Tang, Sumin; Grindlay, Jonathan E.; Los, Edward J; Servillat, Mathieu (University of Chicago Press, 2013)
      The Digital Access to a Sky Century@Harvard (DASCH) project is digitizing the ∼500,000 glass plate images obtained (full sky) by the Harvard College Observatory from 1885 to 1992. Astrometry and photometry for each resolved ...
    • Metamorphosis of Sn 2014c: Delayed Interaction Between a Hydrogen Poor Core-Collapse Supernova and a Nearby Circumstellar Shell 

      Milisavljevic, Danny; Margutti, R; Kamble, Atish; Patnaude, Daniel James; Raymond, John Charles; Eldridge, J. J.; Fong, W.; Bietenholz, M.; Challis, Peter M.; Chornock, R; Drout, Maria Rebecca; Fransson, C.; Fesen, R. A.; Grindlay, Jonathan E.; Kirshner, Robert P.; Lunnan, R; Mackey, J.; Miller, George Franklin; Parrent, Jerod T.; Sanders, Nathan Edward; Soderberg, Alicia M.; Zauderer, B (IOP Publishing, 2015)
      We present optical observations of supernova SN 2014C, which underwent an unprecedented slow metamorphosis from H-poor type Ib to H-rich type IIn over the course of one year. The observed spectroscopic evolution is consistent ...
    • Multi-Wavelength Observations of the Radio Magnetar PSR J1622–4950 and Discovery of its Possibly Associated Supernova Remnant 

      Anderson, Gemma E.; Gaensler, B. M.; Slane, Patrick Olson; Rea, Nanda; Kaplan, David L.; Posselt, Bettina; Levin, Lina; Johnston, Simon; Murray, Stephen S.; Brogan, Crystal L.; Bailes, Matthew; Bates, Samuel; Benjamin, Robert A.; Ramesh Bhat, N. D.; Burgay, Marta; Burke-Spolaor, Sarah; Chakrabarty, Deepto; D'Amico, Nichi; Drake, Jeremy J.; Esposito, Paolo; Grindlay, Jonathan E.; Hong, Jaesub; Israel, G. L.; Keith, Michael J.; Kramer, Michael; Lazio, T. Joseph W.; Lee, Julia C; Mauerhan, Jon C.; Milia, Sabrina; Possenti, Andrea; Stappers, Ben; Steeghs, Danny T. H. (IOP Publishing, 2012)
      We present multi-wavelength observations of the radio magnetar PSR J1622-4950 and its environment. Observations of PSR J1622-4950 with Chandra (in 2007 and 2009) and XMM (in 2011) show that the X-ray flux of PSR J1622-4950 ...
    • The Nuclear Spectroscopic Telescope Array (NuSTAR) High-Energy X-Ray Mission 

      Harrison, Fiona A.; Craig, William W.; Christensen, Finn E.; Hailey, Charles J.; Zhang, William W.; Boggs, Steven E.; Stern, Daniel; Cook, W. Rick; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Kim, Yunjin; Kitaguchi, Takao; Koglin, Jason E.; Madsen, Kristin K.; Mao, Peter H.; Miyasaka, Hiromasa; Mori, Kaya; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram R.; Westergaard, Niels J.; Willis, Jason; Zoglauer, Andreas; An, Hongjun; Bachetti, Matteo; Barrière, Nicolas M.; Bellm, Eric C.; Bhalerao, Varun; Brejnholt, Nicolai F.; Fuerst, Felix; Liebe, Carl C.; Markwardt, Craig B.; Nynka, Melania; Vogel, Julia K.; Walton, Dominic J.; Wik, Daniel R.; Alexander, David M.; Cominsky, Lynn R.; Hornschemeier, Ann E.; Hornstrup, Allan; Kaspi, Victoria M.; Madejski, Greg M.; Matt, Giorgio; Molendi, Silvano; Smith, David M.; Tomsick, John A.; Ajello, Marco; Ballantyne, David R.; Baloković, Mislav; Barret, Didier; Bauer, Franz E.; Blandford, Roger D.; Brandt, W. Niel; Brenneman, Laura W.; Chiang, James; Chakrabarty, Deepto; Chenevez, Jerome; Comastri, Andrea; Dufour, Francois; Elvis, Martin S.; Fabian, Andrew C.; Farrah, Duncan; Fryer, Chris L.; Gotthelf, Eric V.; Grindlay, Jonathan E.; Helfand, David J.; Krivonos, Roman; Meier, David L.; Miller, Jon M.; Natalucci, Lorenzo; Ogle, Patrick; Ofek, Eran O.; Ptak, Andrew; Reynolds, Stephen P.; Rigby, Jane R.; Tagliaferri, Gianpiero; Thorsett, Stephen E.; Treister, Ezequiel; Urry, C. Megan (IOP Publishing, 2013)
      The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in the band from 3 to 79 keV, extending the sensitivity of ...
    • NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray Morphology and Spectroscopy of the Diffuse Emission 

      Mori, Kaya; Hailey, Charles J.; Krivonos, Roman; Hong, Jaesub; Ponti, Gabriele; Bauer, Franz; Perez, Kerstin; Nynka, Melania; Zhang, Shuo; Tomsick, John A.; Alexander, David M.; Baganoff, Frederick K.; Barret, Didier; Barrière, Nicolas; Boggs, Steven E.; Canipe, Alicia M.; Christensen, Finn E.; Craig, William W.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Grindlay, Jonathan E.; Harrison, Fiona A.; Hornstrup, Allan; Kitaguchi, Takao; Koglin, Jason E.; Luu, Vy; Madsen, Kristen K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Stern, Daniel; Westergaard, Niels J.; Zhang, William W.; Zoglauer, Andreas (IOP Publishing, 2015)
      We present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456–2901 into non-thermal X-ray filaments, molecular clouds, point sources, ...
    • NuSTAR Hard X-ray Survey of the Galactic Center Region II: X-ray Point Sources 

      Hong, Jaesub; Mori, Kaya; Hailey, Charles J.; Nynka, Melania; Zhang, Shuo; Gotthelf, Eric; Fornasini, Francesca M.; Krivonos, Roman; Bauer, Franz; Perez, Kerstin; Tomsick, John A.; Bodaghee, Arash; Chiu, Jeng-Lun; Clavel, Maïca; Stern, Daniel; Grindlay, Jonathan E.; Alexander, David M.; Aramaki, Tsuguo; Baganoff, Frederick K.; Barret, Didier; Barrière, Nicolas; Boggs, Steven E.; Canipe, Alicia M.; Christensen, Finn E.; Craig, William W.; Desai, Meera A.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Harrison, Fiona A.; Hong, Dooran; Hornstrup, Allan; Kitaguchi, Takao; Koglin, Jason E.; Madsen, Kristen K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Westergaard, Niels J.; Zhang, William W.; Zoglauer, Andreas (American Astronomical Society, 2016)
      We present the first survey results of hard X-ray point sources in the Galactic Center (GC) region by NuSTAR. We have discovered 70 hard (3–79 keV) X-ray point sources in a 0.6 deg${}^{2}$ region around Sgr A* with a total ...
    • NuSTAR J163433-4738.7: A Fast X-Ray Transient in the Galactic Plane 

      Tomsick, John A.; Gotthelf, Eric V.; Rahoui, Farid; Assef, Roberto J.; Bauer, Franz E.; Bodaghee, Arash; Boggs, Steven E.; Christensen, Finn E.; Craig, William W.; Fornasini, Francesca M.; Grindlay, Jonathan E.; Hailey, Charles J.; Harrison, Fiona A.; Krivonos, Roman; Natalucci, Lorenzo; Stern, Daniel; Zhang, William W. (IOP Publishing, 2014)
      During hard X-ray observations of the Norma spiral arm region by the Nuclear Spectroscopic Telescope Array (NuSTAR) in 2013 February, a new transient source, NuSTAR J163433-4738.7, was detected at a significance level of ...
    • Optical spectroscopic observations of gamma-ray blazars candidates I: preliminary results 

      Paggi, A.; Milisavljevic, Danny; Masetti, N.; Jiménez-Bailón, E.; Chavushyan, V.; Massaro, F.; Giroletti, M.; Smith, Howard A.; Margutti, R.; Tosti, G.; Martínez-Galarza, J. R.; Otí-Floranes, H.; Landoni, M.; Grindlay, Jonathan E.; Funk, S. (IOP Publishing, 2014)
      A significant fraction (~30%) of the γ-ray sources listed in the second Fermi/LAT (2FGL) catalog is still of unknown origin, being not yet associated with counterparts at lower energies. Using the available information at ...