Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-01-26
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Accepted for publication in A&A
Scientific paper
On 28 May 2008, the Swift satellite detected the first reactivation of SGR 1627-41 since its discovery in 1998. Following this event we began an observing campaign in near infrared wavelengths to search for a possible counterpart inside the error circle of this SGR, which is expected to show flaring activity simultaneous to the high energy flares or at least some variability as compared to the quiescent state. For the follow-up we used the 0.6m REM robotic telescope at La Silla Observatory, which allowed a fast response within 24 hours and, through director discretionary time, the 8.2m Very Large Telescope at Paranal Observatory. There, we observed with NACO to produce high angular resolution imaging with the aid of adaptive optics. These observations represent the fastest near infrared observations after an activation of this SGR and the deepest and highest spatial resolution observations of the Chandra error circle. 5 sources are detected in the immediate vicinity of the most precise X-ray localisation of this source. For 4 of them we do not detect variability, although the X-ray counterpart experimented a significant decay during our observation period. The 5th source is only detected in one epoch, where we have the best image quality, so no variability constrains can be imposed and remains as the only plausible counterpart. We can impose a limit of Ks > 21.6 magnitudes to any other counterpart candidate one week after the onset of the activity. Our adaptive optics imaging, with a resolution of 0.2" provides a reference frame for subsequent studies of future periods of activity.
Castro-Tirado Alberto J.
Covino Stefano
D'Avanzo Paolo
de Ugarte Postigo Antonio
Gorosabel Javier
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Jfo
Hi,It would be nice to see an article about the vauucm. There is all kinds of interesting stuff going on in there.In particular I would be interested to know if you think that the fundamental constants could be intrinsic properties of the vauucm and if these constants could be scale dependent giving rise to the fundamental forces.Cosmic scale (dark energy)Everyday scale (gravity)Atomic scale (electromagnetism)Nuclear scale (weak force)Proton scale (color force)10E10 GEV scale (inflation force)So each force could be associated with a scale dependent vauucm structure.Its interesting that the electroweak force has both a short range component and a long range inverse square component. Gravity has no obvious short range property and the color force has no obvious long range property so perhaps they are both aspects of the same underlying force.
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