Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system: II. The non-dip spectrum in the low/hard state – modulations with orbital phase

Abstract

Accretion onto the black hole in the system HDE 226868/Cygnus X-1 is powered by the strong line-driven stellar wind of the O-type donor star. We study the X-ray properties of the stellar wind in the hard state of Cyg X-1, as determined using data from the Chandra High Energy Transmission Gratings. Large density and temperature inhomogeneities are present in the wind, with a fraction of the wind consisting of clumps of matter with higher density and lower temperature embedded in a photoionized gas. Absorption dips observed in the light curve are believed to be caused by these clumps. This work concentrates on the non-dip spectra as a function of orbital phase. The spectra show lines of H-like and He-like ions of S, Si, Na, Mg, Al, and highly ionized Fe (Fe xvii–Fe xxiv). We measure velocity shifts, column densities, and thermal broadening of the line series. The excellent quality of these five observations allows us to investigate the orbital phase-dependence of these parameters. We show that the absorber is located close to the black hole. Doppler shifted lines point at a complex wind structure in this region, while emission lines seen in some observations are from a denser medium thanmore » the absorber. Here, the observed line profiles are phase-dependent. Their shapes vary from pure, symmetric absorption at the superior conjunction to P Cygni profiles at the inferior conjunction of the black hole.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [3];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [1]
+ Show Author Affiliations
  1. Univ. Erlangen-Nurnberg, Bamberg (Germany)
  2. Univ. Erlangen-Nurnberg, Bamberg (Germany); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. Univ. Erlangen-Nurnberg, Bamberg (Germany); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Univ. Erlangen-Nurnberg, Bamberg (Germany); AIT Austrian Institute of Technology GmbH, Vienna (Austria)
  7. Radboud Univ. Nijmegen, Nigmegen (The Netherlands); SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
  8. Univ. of Cambridge, Cambridge (United Kingdom)
  9. CEA/DSM-CNRS-Univ. Paris Diderot, Gif-sur-Yvette (France)
  10. Max-Planck Computing and Data Facility, Garching (Germany)
  11. Georgia College & State Univ., Milledgeville, GA (United States)
  12. Univ. of California, Berkeley, CA (United States)
  13. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  14. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438726
Report Number(s):
LLNL-JRNL-737481
Journal ID: ISSN 0004-6361; TRN: US1900504
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 590; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; accretion; accretion disks; stars: individual: Cyg X-1; stars: individual: HDE 226868; X-rays: binaries; stars: winds; outflows

Citation Formats

Miskovicova, Ivica, Hell, Natalie, Hanke, Manfred, Nowak, Michael A., Pottschmidt, Katja, Schulz, Norbert S., Grinberg, Victoria, Duro, Refiz, Madej, Oliwia K., Lohfink, Anne M., Rodriguez, Jerome, Bel, Marion Cadolle, Bodaghee, Arash, Tomsick, John A., Lee, Julia C., Brown, Gregory V., and Wilms, Jorn. Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system: II. The non-dip spectrum in the low/hard state – modulations with orbital phase. United States: N. p., 2016. Web. doi:10.1051/0004-6361/201322490.
Copy to clipboard
Miskovicova, Ivica, Hell, Natalie, Hanke, Manfred, Nowak, Michael A., Pottschmidt, Katja, Schulz, Norbert S., Grinberg, Victoria, Duro, Refiz, Madej, Oliwia K., Lohfink, Anne M., Rodriguez, Jerome, Bel, Marion Cadolle, Bodaghee, Arash, Tomsick, John A., Lee, Julia C., Brown, Gregory V., & Wilms, Jorn. Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system: II. The non-dip spectrum in the low/hard state – modulations with orbital phase. United States. https://doi.org/10.1051/0004-6361/201322490
Copy to clipboard
Miskovicova, Ivica, Hell, Natalie, Hanke, Manfred, Nowak, Michael A., Pottschmidt, Katja, Schulz, Norbert S., Grinberg, Victoria, Duro, Refiz, Madej, Oliwia K., Lohfink, Anne M., Rodriguez, Jerome, Bel, Marion Cadolle, Bodaghee, Arash, Tomsick, John A., Lee, Julia C., Brown, Gregory V., and Wilms, Jorn. Wed . "Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system: II. The non-dip spectrum in the low/hard state – modulations with orbital phase". United States. https://doi.org/10.1051/0004-6361/201322490. https://www.osti.gov/servlets/purl/1438726.
Copy to clipboard
@article{osti_1438726,
title = {Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system: II. The non-dip spectrum in the low/hard state – modulations with orbital phase},
author = {Miskovicova, Ivica and Hell, Natalie and Hanke, Manfred and Nowak, Michael A. and Pottschmidt, Katja and Schulz, Norbert S. and Grinberg, Victoria and Duro, Refiz and Madej, Oliwia K. and Lohfink, Anne M. and Rodriguez, Jerome and Bel, Marion Cadolle and Bodaghee, Arash and Tomsick, John A. and Lee, Julia C. and Brown, Gregory V. and Wilms, Jorn},
abstractNote = {Accretion onto the black hole in the system HDE 226868/Cygnus X-1 is powered by the strong line-driven stellar wind of the O-type donor star. We study the X-ray properties of the stellar wind in the hard state of Cyg X-1, as determined using data from the Chandra High Energy Transmission Gratings. Large density and temperature inhomogeneities are present in the wind, with a fraction of the wind consisting of clumps of matter with higher density and lower temperature embedded in a photoionized gas. Absorption dips observed in the light curve are believed to be caused by these clumps. This work concentrates on the non-dip spectra as a function of orbital phase. The spectra show lines of H-like and He-like ions of S, Si, Na, Mg, Al, and highly ionized Fe (Fe xvii–Fe xxiv). We measure velocity shifts, column densities, and thermal broadening of the line series. The excellent quality of these five observations allows us to investigate the orbital phase-dependence of these parameters. We show that the absorber is located close to the black hole. Doppler shifted lines point at a complex wind structure in this region, while emission lines seen in some observations are from a denser medium than the absorber. Here, the observed line profiles are phase-dependent. Their shapes vary from pure, symmetric absorption at the superior conjunction to P Cygni profiles at the inferior conjunction of the black hole.},
doi = {10.1051/0004-6361/201322490},
journal = {Astronomy and Astrophysics},
number = ,
volume = 590,
place = {United States},
year = {Wed May 25 00:00:00 EDT 2016},
month = {Wed May 25 00:00:00 EDT 2016}
}
Copy to clipboard
Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1051/0004-6361/201322490
Copyright Statement
Other availability
Search WorldCat Search WorldCat to find libraries that may hold this journal
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

Works referenced in this record:

Orbital Modulation of X‐Rays from Cygnus X‐1 in its Hard and Soft States
journal, November 1999

  • Wen, Linqing; Cui, Wei; Levine, Alan M.
  • The Astrophysical Journal, Vol. 525, Issue 2
  • DOI: 10.1086/307917

X-ray nebular models
journal, December 1982

  • Kallman, T. R.; McCray, R.
  • The Astrophysical Journal Supplement Series, Vol. 50
  • DOI: 10.1086/190828

X-Ray Absorption Events in Cygnus X-1 Observed with Copernicus
journal, September 1974

  • Mason, Keith O.; Hawkins, Frederick J.; Sanford, Peter W.
  • The Astrophysical Journal, Vol. 192
  • DOI: 10.1086/181592

Long term variability of Cygnus X–1: I. X-ray spectral-temporal correlations in the hard state
journal, September 2003

Updated Atomic data and Calculations for X-Ray Spectroscopy
journal, August 2012

Wind dynamics in SMC X-1. 1: Hydrodynamic simulation
journal, May 1995

  • Blondin, John M.; Woo, Jonathan W.
  • The Astrophysical Journal, Vol. 445
  • DOI: 10.1086/175748

Interpretation of Solar Helium-Like Ion Line Intensities
journal, July 1969

  • Gabriel, A. H.; Jordan, C.
  • Monthly Notices of the Royal Astronomical Society, Vol. 145, Issue 2
  • DOI: 10.1093/mnras/145.2.241

Radiation-driven winds in X-ray binaries
journal, October 1982

  • Friend, D. B.; Castor, J. I.
  • The Astrophysical Journal, Vol. 261
  • DOI: 10.1086/160340

Predictions for mass-loss rates and terminal wind velocities of massive O-type stars
journal, January 2012

The distribution of X-ray dips with orbital phase in Cygnus X-1
journal, February 2000

  • Balucinska-Church, M.; Church, M. J.; Charles, P. A.
  • Monthly Notices of the Royal Astronomical Society, Vol. 311, Issue 4
  • DOI: 10.1046/j.1365-8711.2000.03149.x

Periodic long-term X-ray and radio variability of Cygnus X-1
journal, April 2006

  • Lachowicz, Paweł; Zdziarski, Andrzej A.; Schwarzenberg-Czerny, Alex
  • Monthly Notices of the Royal Astronomical Society, Vol. 368, Issue 3
  • DOI: 10.1111/j.1365-2966.2006.10219.x

The Variable Warm Absorber in Circinus X‐1
journal, January 2008

  • Schulz, N. S.; Kallman, T. E.; Galloway, D. K.
  • The Astrophysical Journal, Vol. 672, Issue 2
  • DOI: 10.1086/523809

A Multiwavelength Study of Cygnus x-1: the First Mid-Infrared Spectroscopic Detection of Compact jets
journal, July 2011

Radiation-driven winds in Of stars
journal, January 1975

  • Castor, J. I.; Abbott, D. C.; Klein, R. I.
  • The Astrophysical Journal, Vol. 195
  • DOI: 10.1086/153315

Model independent means of categorizing X-ray binaries – I. Colour–colour–intensity diagrams
journal, December 2012

  • Vrtilek, Saeqa Dil; Boroson, Bram Seth
  • Monthly Notices of the Royal Astronomical Society, Vol. 428, Issue 4
  • DOI: 10.1093/mnras/sts312

Long term variability of Cygnus X-1: V. State definitions with all sky monitors
journal, June 2013

Extended-bandwidth X-ray observations of Cygnus X-1
journal, October 1979

  • Priedhorsky, W.; Garmire, G. P.; Rothschild, R.
  • The Astrophysical Journal, Vol. 233
  • DOI: 10.1086/157396

The X‐Ray Spectrum and Global Structure of the Stellar Wind in Vela X‐1
journal, November 1999

  • Sako, Masao; Liedahl, Duane A.; Kahn, Steven M.
  • The Astrophysical Journal, Vol. 525, Issue 2
  • DOI: 10.1086/307924

The broad iron K α line of Cygnus X-1 as seen by XMM-Newton in the EPIC-pn modified timing mode
journal, August 2011

Orbital, precessional and flaring variability of Cygnus X-1
journal, November 1999

The MAXI Mission on the ISS: Science and Instruments for Monitoring All-Sky X-Ray Images
journal, October 2009

  • Matsuoka, Masaru; Kawasaki, Kazuyoshi; Ueno, Shiro
  • Publications of the Astronomical Society of Japan, Vol. 61, Issue 5
  • DOI: 10.1093/pasj/61.5.999

Discovery of Two Types of X‐Ray Dips in Cygnus X‐1
journal, January 2002

  • Feng, Y. X.; Cui, Wei
  • The Astrophysical Journal, Vol. 564, Issue 2
  • DOI: 10.1086/324284

The First High‐Resolution X‐Ray Spectrum of Cygnus X‐1: Soft X‐Ray Ionization and Absorption
journal, February 2002

  • Schulz, N. S.; Cui, W.; Canizares, C. R.
  • The Astrophysical Journal, Vol. 565, Issue 2
  • DOI: 10.1086/324482

On the Mechanism of Accretion by Stars
journal, October 1944

  • Bondi, H.; Hoyle, F.
  • Monthly Notices of the Royal Astronomical Society, Vol. 104, Issue 5
  • DOI: 10.1093/mnras/104.5.273

Long term variability of Cygnus X-1: VII. Orbital variability of the focussed wind in Cyg X-1/HDE 226868 system⋆
journal, April 2015

X-ray and ultraviolet spectroscopy of Cygnus X-1 = HDE 226868
journal, April 1980

  • Pravdo, S. H.; White, N. E.; Becker, R. H.
  • The Astrophysical Journal, Vol. 237
  • DOI: 10.1086/183237

CORONA, JET, AND RELATIVISTIC LINE MODELS FOR SUZAKU / RXTE / CHANDRA -HETG OBSERVATIONS OF THE CYGNUS X-1 HARD STATE
journal, January 2011

  • Nowak, Michael A.; Hanke, Manfred; Trowbridge, Sarah N.
  • The Astrophysical Journal, Vol. 728, Issue 1
  • DOI: 10.1088/0004-637X/728/1/13

Parameter estimation in X-ray astronomy
journal, August 1976

  • Lampton, M.; Margon, B.; Bowyer, S.
  • The Astrophysical Journal, Vol. 208
  • DOI: 10.1086/154592

ADVANCES IN THE RXTE PROPORTIONAL COUNTER ARRAY CALIBRATION: NEARING THE STATISTICAL LIMIT
journal, September 2012

The Spectrum of HDE 226868 (=CYGNUS X-1)
journal, January 1973

  • Walborn, Nolan R.
  • The Astrophysical Journal, Vol. 179
  • DOI: 10.1086/181131

On the determination of the spin of the black hole in Cyg X-1 from X-ray reflection spectra: Reflection and spin in Cyg X-1
journal, June 2012

Stellar Wind Variations during the X‐Ray High and Low States of Cygnus X‐11,2
journal, May 2008

  • Gies, D. R.; Bolton, C. T.; Blake, R. M.
  • The Astrophysical Journal, Vol. 678, Issue 2
  • DOI: 10.1086/586690

Clumping in the inner winds of hot, massive stars from hydrodynamical line-driven instability simulations
journal, November 2012

  • Sundqvist, Jon O.; Owocki, Stanley P.
  • Monthly Notices of the Royal Astronomical Society, Vol. 428, Issue 2
  • DOI: 10.1093/mnras/sts165

SAS 3 observations of Cygnus X-1 - The intensity dips
journal, March 1984

  • Remillard, R. A.; Canizares, C. R.
  • The Astrophysical Journal, Vol. 278
  • DOI: 10.1086/161846

Ultraviolet Observations of the X‐Ray Photoionized Wind of Cygnus X‐1 during X‐Ray Soft/High State1
journal, May 2008

  • Vrtilek, S. D.; Boroson, B. S.; Hunacek, A.
  • The Astrophysical Journal, Vol. 678, Issue 2
  • DOI: 10.1086/586692

Resolving the Composite Fe Kα Emission Line in the Galactic Black Hole Cygnus X‐1 with Chandra
journal, October 2002

  • Miller, J. M.; Fabian, A. C.; Wijnands, R.
  • The Astrophysical Journal, Vol. 578, Issue 1
  • DOI: 10.1086/342466

High-energy spectra from black-hole candidates
journal, June 2004

GINGA All‐Sky Monitor Observations of Cygnus X‐1
journal, March 2000

  • Kitamoto, Shunji; Egoshi, Wataru; Miyamoto, Sigenori
  • The Astrophysical Journal, Vol. 531, Issue 1
  • DOI: 10.1086/308423

X-ray photoionized plasma diagnostics with helium-like ions. Application to warm absorber-emitter in active galactic nuclei
journal, May 2000

  • Porquet, D.; Dubau, J.
  • Astronomy and Astrophysics Supplement Series, Vol. 143, Issue 3
  • DOI: 10.1051/aas:2000192

Variability of the X‐Ray P Cygni Line Profiles from Circinus X‐1 near Zero Phase
journal, June 2002

  • Schulz, N. S.; Brandt, W. N.
  • The Astrophysical Journal, Vol. 572, Issue 2
  • DOI: 10.1086/340369

Atomic Data for Astrophysics. II. New Analytic FITS for Photoionization Cross Sections of Atoms and Ions
journal, July 1996

  • Verner, D. A.; Ferland, G. J.; Korista, K. T.
  • The Astrophysical Journal, Vol. 465
  • DOI: 10.1086/177435

THE REFLECTION COMPONENT FROM CYGNUS X-1 IN THE SOFT STATE MEASURED BY NuSTAR AND SUZAKU
journal, December 2013

  • Tomsick, John A.; Nowak, Michael A.; Parker, Michael
  • The Astrophysical Journal, Vol. 780, Issue 1
  • DOI: 10.1088/0004-637X/780/1/78

Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray variability and photoionization: Clumped stellar winds in HMXBs
journal, March 2012

Long term variability of Cygnus X-1: IV. Spectral evolution 1999–2004
journal, January 2006

CHANDRA X-RAY SPECTROSCOPY OF THE FOCUSED WIND IN THE CYGNUS X-1 SYSTEM. I. THE NONDIP SPECTRUM IN THE LOW/HARD STATE
journal, December 2008

The mass of the Black hole in Cygnus x-1
journal, November 2011

  • Orosz, Jerome A.; McClintock, Jeffrey E.; Aufdenberg, Jason P.
  • The Astrophysical Journal, Vol. 742, Issue 2
  • DOI: 10.1088/0004-637X/742/2/84

The Trigonometric Parallax of Cygnus x-1
journal, November 2011

  • Reid, Mark J.; McClintock, Jeffrey E.; Narayan, Ramesh
  • The Astrophysical Journal, Vol. 742, Issue 2
  • DOI: 10.1088/0004-637X/742/2/83

THE ULTRAVIOLET SPECTRUM AND PHYSICAL PROPERTIES OF THE MASS DONOR STAR IN HD 226868 = Cygnus X-1
journal, August 2009

Revealing the Focused Companion Wind in Cygnus X‐1 with Chandra
journal, February 2005

  • Miller, J. M.; Wojdowski, P.; Schulz, N. S.
  • The Astrophysical Journal, Vol. 620, Issue 1
  • DOI: 10.1086/426701

Enhanced winds and tidal streams in massive X-ray binaries
journal, April 1991

  • Blondin, John M.; Stevens, Ian R.; Kallman, Timothy R.
  • The Astrophysical Journal, Vol. 371
  • DOI: 10.1086/169934

The Chandra High‐Energy Transmission Grating: Design, Fabrication, Ground Calibration, and 5 Years in Flight
journal, October 2005

  • Canizares, Claude R.; Davis, John E.; Dewey, Daniel
  • Publications of the Astronomical Society of the Pacific, Vol. 117, Issue 836
  • DOI: 10.1086/432898

Wind Accretion and State Transitions in Cygnus X‐1
journal, January 2003

  • Gies, D. R.; Bolton, C. T.; Thomson, J. R.
  • The Astrophysical Journal, Vol. 583, Issue 1
  • DOI: 10.1086/345345

X-Ray Variations at the Orbital Period from Cygnus x-1 in the High/Soft State
journal, January 2010

The Interaction of X-Ray Sources with Optically Thin Environments
journal, June 1969

  • Tarter, C. Bruce; Tucker, Wallace H.; Salpeter, Edwin E.
  • The Astrophysical Journal, Vol. 156
  • DOI: 10.1086/150026

Inner‐Shell 1 s –2 p Soft X‐Ray Absorption Lines
journal, May 2002

  • Behar, Ehud; Netzer, Hagai
  • The Astrophysical Journal, Vol. 570, Issue 1
  • DOI: 10.1086/339581

The shadow wind in high-mass X-ray binaries
journal, November 1994

  • Blondin, John M.
  • The Astrophysical Journal, Vol. 435
  • DOI: 10.1086/174853

High resolution X-ray spectroscopy of ζ Puppis with the XMM-Newton reflection grating spectrometer
journal, January 2001

Radiation mechanisms and geometry of Cygnus X-1 in the soft state
journal, October 1999

Low charge states of Si and S in Cygnus X-1
journal, September 2013

The Optical Spectrum of HDE 226868=Cygnus X-1. III. A Focused Stellar Wind Model for He II lambda 4686 Emission
journal, May 1986

  • Gies, D. R.; Bolton, C. T.
  • The Astrophysical Journal, Vol. 304
  • DOI: 10.1086/164172

First Results from the All-Sky Monitor on the [ITAL]Rossi X-Ray Timing Explorer[/ITAL]
journal, September 1996

  • Levine, Alan M.; Bradt, Hale; Cui, Wei
  • The Astrophysical Journal, Vol. 469, Issue 1
  • DOI: 10.1086/310260

Revealing the broad iron K α line in Cygnus X-1 through simultaneous XMM-Newton , RXTE, and INTEGRAL observations
journal, April 2016

New results from long-term observations of Cygnus X-1
journal, January 1976

  • Holt, S. S.; Boldt, E. A.; Serlemitsos, P. J.
  • The Astrophysical Journal, Vol. 203
  • DOI: 10.1086/182020

Calibration of the Rossi X‐Ray Timing Explorer Proportional Counter Array
journal, April 2006

  • Jahoda, Keith; Markwardt, Craig B.; Radeva, Yana
  • The Astrophysical Journal Supplement Series, Vol. 163, Issue 2
  • DOI: 10.1086/500659

Observation of an absorption dip in the X-ray intensity CYG X-1.
journal, July 1974

  • Li, K. F.; Clark, G. W.
  • The Astrophysical Journal, Vol. 191
  • DOI: 10.1086/181538

The column density towards LMC X-1
journal, January 2010

Superorbital variability of X-ray and radio emission of Cyg X-1 - II. Dependence of the orbital modulation and spectral hardness on the superorbital phase
journal, September 2008

  • Poutanen, Juri; Zdziarski, Andrzej A.; Ibragimov, Askar
  • Monthly Notices of the Royal Astronomical Society, Vol. 389, Issue 3
  • DOI: 10.1111/j.1365-2966.2008.13666.x

On the Absorption of X‐Rays in the Interstellar Medium
journal, October 2000

  • Wilms, J.; Allen, A.; McCray, R.
  • The Astrophysical Journal, Vol. 542, Issue 2
  • DOI: 10.1086/317016

Using the X-Ray dust Scattering halo of Cygnus x-1 to Determine Distance and dust Distributions
journal, August 2011

Quenching of the Radio Jet during the X-Ray High State of GX 339−4
journal, July 1999

  • Fender, Robert; Corbel, Stéphane; Tzioumis, Tasso
  • The Astrophysical Journal, Vol. 519, Issue 2
  • DOI: 10.1086/312128

Cygnus X-1—a Spectroscopic Binary with a Heavy Companion ?
journal, January 1972

  • Webster, B. Louise; Murdin, Paul
  • Nature, Vol. 235, Issue 5332
  • DOI: 10.1038/235037a0
    Sort by:
    [ × clear filter / sort ]

    Works referencing / citing this record:

    Highly charged ions in a new era of high resolution X‐ray astrophysics
    journal, April 2019

    • Hell, Natalie; Beiersdorfer, Peter; Brown, Gregory V.
    • X-Ray Spectrometry, Vol. 49, Issue 1
    • DOI: 10.1002/xrs.3107

    A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472
    journal, November 2019

    Relativistic MR–MP Energy Levels for L-shell Ions of Silicon
    journal, January 2018

    • Santana, Juan A.; Lopez-Dauphin, Nahyr A.; Beiersdorfer, Peter
    • The Astrophysical Journal Supplement Series, Vol. 234, Issue 1
    • DOI: 10.3847/1538-4365/aa94d2

    Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon
    journal, October 2018

    • Santana, Juan A.; Lopez-Dauphin, Nahyr A.; Morales Butler, Emmanuel J.
    • The Astrophysical Journal Supplement Series, Vol. 238, Issue 2
    • DOI: 10.3847/1538-4365/aae14e

    A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472
    text, January 2019

      Sort by:
      [ × clear filter / sort ]

      Similar Records in DOE PAGES and OSTI.GOV collections: