Unveiling the Multi-wavelength Phenomenology of Anomalous X-ray Pulsars

Israel, G. L.; Stella, L.; Covino, S.; Campana, S.; Angelini, L.; Mignani, Roberto; Mereghetti, S.; Marconi, G.; Perna, Rosalba

doi:10.1017/s0074180900181070

Cited by 16 publications

(15 citation statements)

References 17 publications

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“…In particular, we report on the likely discovery of the IR counterpart to SGR 1806-20 based on positional coincidence with the radio and Chandra positions and flux variability. (Preliminary results were reported in Israel et al 2004Israel et al , 2005a, before and independently from Kosugi et al 2005). We briefly compare the IR emission properties of SGR 1806-20 with those of related objects.…”

Section: Introductionmentioning

confidence: 78%

Discovery and monitoring of the likely IR counterpart of SGR 1806–20 during the 2004 γ-ray burst-active state

Israel¹,

Covino

Mignani

et al. 2005

A&A

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Abstract. The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were performed using NAOS-CONICA, the adaptive optics IR camera mounted on Yepun VLT, which provided images of unprecedented quality (FWHM better than 0. 1). After the 2004 December 27th giant flare, the source position has been nailed by VLA observations of its radio counterpart, reducing the positional uncertainty to 0. 04. Using IR data from our monitoring campaign, we discovered the likely IR counterpart to SGR 1806-20 based on positional coincidence with the Chandra and VLA uncertainty regions and flux variability of a factor of about 2 correlated with that at higher energies. We compare our findings with other isolated neutron star classes thought to be related, at some level, with SGRs.

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Section: Introductionmentioning

confidence: 78%

Discovery and monitoring of the likely IR counterpart of SGR 1806–20 during the 2004 γ-ray burst-active state

Israel¹,

Covino

Mignani

et al. 2005

A&A

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“…A variable infrared counterpart have been discovered for this object [71,129], although no clear correlation between the X-ray and infrared variability have been confirmed [142]. XTE J1810−197 is now close to its quiescent level, and showed the longest outburst decay ever observed in magnetars, with a consequent slow spectral softening over a timescale of about 5 years (see also Figure 4).…”

Section: Xte J1810−197mentioning

confidence: 95%

Magnetar outbursts: an observational review

Rea

Esposito

2010

Astrophysics and Space Science Proceedings

128

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Transient outbursts from magnetars have shown to be a key property of their emission, and one of the main way to discover new sources of this class. From the discovery of the first transient event around 2003, we now count about a dozen of outbursts, which increased the number of these strongly magnetic neutron stars by a third in six years. Magnetars' outbursts might involve their multi-band emission resulting in an increased activity from radio to hard X-ray, usually with a soft Xray flux increasing by a factor of 10-1000 with respect to the quiescent level. A connected X-ray spectral evolution is also often observed, with a spectral softening during the outburst decay. The flux decay times vary a lot from source to source, ranging from a few weeks to several years, as also the decay law which can be exponential-like, a power-law or even multiple power-laws can be required to model the flux decrease. We review here on the latest observational results on the multiband emission of magnetars, and summarize one by one all the transient events which could be studied to date from these sources.

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“…There is an optical and NIR excess that can not be explained by the Rayleigh-Jeans tail from the X-ray black body. Moreover the optical and NIR emissions seem to be non thermal and exhibit more variability than seen in the X-rays (Hulleman et al 2004;Israel et al 2004;Morii et al 2005;Durant and van Kerkwijk 2006c).…”

Section: Introductionmentioning

confidence: 98%

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

Hartog

Kuiper

Hermsen

et al. 2007

Astrophys Space Sci

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For the first time a quasi-simultaneous multiwavelength campaign has been performed on an Anomalous X-ray Pulsar from the radio to the hard X-ray band. 4U 0142+61 was an INTEGRAL target for 1 Ms in July 2005. During these observations it was also observed in the X-ray band with Swift and RXTE, in the optical and NIR with Gemini North and in the radio with the WSRT. In this paper we present the source-energy distribution. The spectral results obtained in the individual wave bands do not connect smoothly; apparently components of different origin contribute to the total spectrum. Remarkable is that the INTEGRAL hard X-ray spectrum (power-law index 0.79 ± 0.10) is now measured up to an energy of ∼230 keV with no indication of a spectral break. Extrapolation of the INTEGRAL power-law spectrum to lower energies passes orders of magnitude underneath the NIR and optical fluxes,

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Unveiling the Multi-wavelength Phenomenology of Anomalous X-ray Pulsars

Cited by 16 publications

References 17 publications

Discovery and monitoring of the likely IR counterpart of SGR 1806–20 during the 2004 γ-ray burst-active state

Discovery and monitoring of the likely IR counterpart of SGR 1806–20 during the 2004 γ-ray burst-active state

Magnetar outbursts: an observational review

The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays

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