Does Sgr A* Have an Intrinsic Magnetic Moment Instead of an Event Horizon?

نویسندگان

  • Stanley L. Robertson
  • Darryl J. Leiter
چکیده

We have previously developed a general relativistic model of a gravitationally compact, intrinsically magnetic, eternally collapsing object (MECO). It has been shown to account for the low quiescent xray luminosities and spectral state switches in galactic black hole candidates (GBHC) while correctly predicting the radio/x-ray luminosity correlations of both GBHC and active galactic nuclei. We show here that a MECO model for Sgr A* is consistent with its observed low NIR luminosity levels. It has the unique property of providing an explanation for observed polarizations in the context of an inverted polar jet flow while reconciling the low luminosity of Sgr A* with a standard Bondi accretion flow. Thus the conclusion that Sgr A* contains a black hole with an event horizon is still unsubstantiated. Subject headings: accretion, accretion disks–Galaxy : center–magnetic fields–X-rays: stars

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

6 v 3 1 2 A ug 2 00 8 Does Sgr A * Have an Event Horizon or an Intrinsic Magnetic Moment ?

In previous work we have presented evidence for the existence of intrinsic magnetic moments in black hole candidates. We later developed a general relativistic, magnetospheric eternally collapsing object (MECO) model for black hole candidates and showed that the model is consistent with broad band spectral and luminosity characteristics and accounts for the radio/x-ray luminosity correlations o...

متن کامل

Sgr A* as probe of the theory of supermassive compact objects without event horizon

In the present paper some consequences of the hypothesis that the supermassive compact object in the Galaxy centre relates to a class of objects without event horizon are examined. The possibility of the existence of such objects was substantiated by the author earlier. It is shown that accretion of a surrounding gas can cause nuclear combustion in the surface layer which, as a result of compto...

متن کامل

ar X iv : a st ro - p h / 04 02 10 6 v 1 4 F eb 2 00 4 Probing Sgr A * with theory of large masses without events horizon

In the present paper some consequences of the assumption that in the center of the Galaxy there is a supermassive compact object without the events horizon are considered. The possibility of existence of such object has been argued earlier. It is shown, that accretion of a surrounding gas onto the object can cause nuclear burning in a superficial layer which owing to comptonization in a hotter ...

متن کامل

Analysis of Applying Event-triggered Strategy on the Model Predictive Control

In this paper, the event-triggered strategy in the case of finite-horizon model predictive control (MPC) is studied and its advantages over the input to state stability (ISS) Lyapunov based triggering rule is discussed. In the MPC triggering rule, all the state trajectories in the receding horizon are considered to obtain the triggering rule. Clearly, the finite horizon MPC is sub-optimal with ...

متن کامل

Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process

Free convection flow in an enclosure filled with a congealing melt leads to the product with a nonuniform structure involving large grains. The convective flows are decreased by applying an appropriate magnetic field, obtaining uniform and small grain structures. In this work, using the finite volume method, we investigated the application of a magnetic field to the convective heat transfer and...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008