XMM-Newton EPIC & OM observations of Her X-1 over the 35 d beat period and an anomalous low state

被引：0
|
作者：
Zane, S [1 ]
Ramsay, G [1 ]
Jimenez-Garate, MA [1 ]
den Herder, JW [1 ]
Still, M [1 ]
Boyd, PT [1 ]
Hailey, CJ [1 ]
机构：
[1] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
来源：
Interacting Binaries: Accretion, Evolution, and Outcomes | 2005年 / 797卷
关键词：
accretion and accretion disks; stars : neutron; pulsars : individual (Her X-1); X-rays : stars;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of a series of XMM-Newton EPIC and OM observations of Her X-1, spread over a wide range of the 35 d precession period. We confirm that the spin modulation of the neutron star is weak or absent in the low state - in marked contrast to the main or short-on states. The strong fluorescence emission line at similar to 6.4 keV is detected in all observations (apart from one taken in the middle of eclipse), with higher line energy, width and normalisation during the main-on state. In addition, we report the detection of a second line near 7 keV in 10 of the 15 observations taken during the low-intensity states of the system. We discuss these observations in the context of previous observations, investigate the origin of the soft and hard X-rays and consider the emission site of the 6.4keV and 7keV emission lines.
引用
收藏
页码：507 / 512
页数：6
相关论文
共 29 条
  • [11] NUSTAR, XMM-NEWTON, AND SUZAKU OBSERVATIONS OF THE ULTRALUMINOUS X-RAY SOURCE HOLMBERG II X-1
    Walton, D. J.
    Middleton, M. J.
    Rana, V.
    Miller, J. M.
    Harrison, F. A.
    Fabian, A. C.
    Bachetti, M.
    Barret, D.
    Boggs, S. E.
    Christensen, F. E.
    Craig, W. W.
    Fuerst, F.
    Grefenstette, B. W.
    Hailey, C. J.
    Madsen, K. K.
    Stern, D.
    Zhang, W.
    ASTROPHYSICAL JOURNAL, 2015, 806 (01):
  • [12] The broad iron Kα line of Cygnus X-1 as seen by XMM-Newton in the EPIC-pn modified timing mode
    Duro, R.
    Dauser, T.
    Wilms, J.
    Pottschmidt, K.
    Nowak, M. A.
    Fritz, S.
    Kendziorra, E.
    Kirsch, M. G. F.
    Reynolds, C. S.
    Staubert, R.
    ASTRONOMY & ASTROPHYSICS, 2011, 533
  • [13] Revealing the broad iron Kα line in Cygnus X-1 through simultaneous XMM-Newton, RXTE, and INTEGRAL observations
    Duro, Refiz
    Dauser, Thomas
    Grinberg, Victoria
    Miskovicova, Ivica
    Rodriguez, Jerome
    Tomsick, John
    Hanke, Manfred
    Pottschmidt, Katja
    Nowak, Michael A.
    Kreykenbohm, Sonja
    Bel, Marion Cadolle
    Bodaghee, Arash
    Lohfink, Anne
    Reynolds, Christopher S.
    Kendziorra, Eckhard
    Kirsch, Marcus G. F.
    Staubert, Rudiger
    Wilms, Jorn
    ASTRONOMY & ASTROPHYSICS, 2016, 589
  • [14] XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability
    Pinto, C.
    Walton, D. J.
    Kara, E.
    Parker, M. L.
    Soria, R.
    Kosec, P.
    Middleton, M. J.
    Alston, W. N.
    Fabian, A. C.
    Guainazzi, M.
    Roberts, T. P.
    Fuerst, F.
    Earnshaw, H. P.
    Sathyaprakash, R.
    Barret, D.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 492 (04) : 4646 - 4665
  • [15] BeppoSAX observations of the Her X-1 short-on and anomalous low-states
    Parmar, AN
    Oosterbroek, T
    Dal Fiume, D
    Orlandini, M
    Santangelo, A
    Del Sordo, S
    Segreto, A
    X-RAY ASTRONOMY: STELLAR ENDPOINTS, AGN, AND THE DIFFUSE X-RAY BACKGROUND, 2001, 599 : 838 - 841
  • [16] Modelling RXTE/ASM observations of the 35-d cycle in Her X-1
    Leahy, DA
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2002, 334 (04) : 847 - 854
  • [17] A Broadband X-Ray View of the Precessing Accretion Disk and Pre-eclipse Dip in the Pulsar Her X-1 with NuSTAR and XMM-Newton
    Brumback, McKinley C.
    Hickox, Ryan C.
    Furst, Felix S.
    Pottschmidt, Katja
    Tomsick, John A.
    Wilms, Joern
    Staubert, Ruediger
    Vrtilek, Saeqa
    ASTROPHYSICAL JOURNAL, 2021, 909 (02):
  • [18] XMM-Newton observations of the narrow-line Seyfert 1 galaxy Mrk 335 in a historical low X-ray flux state
    Grupe, Dirk
    Komossa, Stefanie
    Gallo, Luigi C.
    Fabian, Andrew C.
    Larsson, Josefin
    Pradhan, Anil K.
    Xu, Dawei
    Miniutti, Giovanni
    ASTROPHYSICAL JOURNAL, 2008, 681 (02): : 982 - 997
  • [19] Her X-1: Correlation between the histories of the 35 d cycle and the 1.24 sec pulse period
    Staubert, R
    Schandl, S
    Wilms, J
    FIFTH COMPTON SYMPOSIUM, 2000, 510 : 153 - 157
  • [20] Constraints on the velocity and spatial distribution of helium-like ions in the wind of SMC X-1 from observations with the XMM-Newton reflection grating spectrometer
    Wojdowski, Patrick S.
    Liedahl, Duane A.
    ASTROPHYSICAL JOURNAL, 2008, 673 (02): : 1023 - 1032
123