What do exotic equations of state have to offer?

Horvath, J. E.

doi:10.1007/s10509-007-9314-1

Cited by 9 publications

(6 citation statements)

References 29 publications

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“…The most successful model to explain AXPs and SGRs involves highly magnetized neutron stars, or "magnetars" [29,144,145], but other possibilities have been proposed, e.g., models based on INS accreting from residual disks [16,125,3,31], or different kinds of quark stars [167,69,118,14].…”

Section: The Magnetar Candidates: Anomalous X-ray Pulsars and Soft Gamentioning

confidence: 99%

“…Although historically divided in two classes, many similarities indicate that AXPs and SGRs are probably the same kind of astrophysical objects (see [166,79,101] for reviews). The most successful model to explain AXPs and SGRs involves highly magnetized neutron stars, or "magnetars" [29,144,145], but other possibilities have been proposed, e.g., models based on INS accreting from residual disks [16,125,3,31], or different kinds of quark stars [167,69,118,14].…”

Section: The Magnetar Candidates: Anomalous X-ray Pulsars and Soft Ga...mentioning

confidence: 99%

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X-ray emission from isolated neutron stars

Mereghetti

2010

High-Energy Emission From Pulsars and Their Systems

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X-ray emission is a common feature of all varieties of isolated neutron stars (INS) and, thanks to the advent of sensitive instruments with good spectroscopic, timing, and imaging capabilities, X-ray observations have become an essential tool in the study of these objects. Non-thermal X-rays from young, energetic radio pulsars have been detected since the beginning of X-ray astronomy, and the long-sought thermal emission from cooling neutron star's surfaces can now be studied in detail in many pulsars spanning different ages, magnetic fields, and, possibly, surface compositions. In addition, other different manifestations of INS have been discovered with X-ray observations. These new classes of high-energy sources, comprising the nearby X-ray Dim Isolated Neutron Stars, the Central Compact Objects in supernova remnants, the Anomalous X-ray Pulsars, and the Soft Gamma-ray Repeaters, now add up to several tens of confirmed members, plus many candidates, and allow us to study a variety of phenomena unobservable in "standard" radio pulsars.

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Section: The Magnetar Candidates: Anomalous X-ray Pulsars and Soft Gamentioning

confidence: 99%

Section: The Magnetar Candidates: Anomalous X-ray Pulsars and Soft Ga...mentioning

confidence: 99%

X-ray emission from isolated neutron stars

Mereghetti

2010

High-Energy Emission From Pulsars and Their Systems

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“…Historically, AXPs and SGRs were divided into two distinct classes, but many observations indicate that there are no substantial differences between them (see Mereghetti 2008, for a review). Even though alternative interpretations have been proposed (Chatterjee et al 2000;Alpar 2001;Cea 2006;Xu 2007;Horvath 2007;Ouyed et al 2007;Ertan et al 2009), the model involving magnetars, i.e. highly magnetized neutron stars, is the one that currently most successfully explains the properties of AXPs and SGRs (Duncan & Thompson 1992; Thompson & Duncan 1995;Thompson et al 2002).…”

Section: Introductionmentioning

confidence: 99%

The magnetar candidate AX J1818.8−1559

Mereghetti¹,

Esposito²,

Tiengo³

et al. 2012

A&A

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In October 2007, a hard X-ray burst was detected by the INTEGRAL satellite from a direction consistent with the position of AX J1818.8−1559, an X-ray source at low Galactic latitude discovered with the Advanced Satellite for Cosmology and Astrophysics (ASCA) satellite in 1996-1999. The short duration (0.8 s) and soft spectrum (power-law photon index of 3.0 ± 0.2) of the burst in the 20-100 keV range are typical of soft gamma-ray repeaters and anomalous X-ray pulsars. We report on the results of an observation of AX J1818.8−1559 obtained with the Suzaku satellite in October 2011. The source spectrum, a power-law with photon index ∼1.5, and flux (∼2 × 10 −12 erg cm −2 s −1 , 2-10 keV) did not show significant variations from those derived from archival data of various satellites obtained from 1993 to 2011. We discuss possible interpretations of the data for AX J1818.8−1559 and, based on its association with the INTEGRAL burst, we propose it as a new member of the small class of magnetar candidates.

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“…In the table, a few major searches are listed (we modestly include ours [18,19]), along with the mass range to which they will be/are/were sensitive and the result, where there is one, in terms of the inferred SQN density in our region of the galaxy. An interesting SQM space search using the equipment being deployed to monitor near Earth asteroids has been proposed by Horvath [20]. Our methods below should apply to other, similar models such as that of Zhitnitsky [21] on cold dark matter as compact composite objects.…”

Section: Introductionmentioning

confidence: 99%

Charges on strange quark nuggets in space

et al. 2009

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Since Witten's seminal 1984 paper on the subject, searches for evidence of strange quark nuggets (SQNs) have proven unsuccessful. In the absence of experimental evidence ruling out SQNs, the validity of theories introducing mechanisms that increase their stability should continue to be tested. To stimulate electromagnetic SQN searches, particularly space searches, we estimate the net charge that would develop on an SQN in space exposed to various radiation baths (and showers) capable of liberating the SQN's less strongly bound electrons, taking into account recombination with ambient electrons. We consider, in particular, the cosmic microwave background , radiation from the sun, and diffuse galactic and extragalactic ultraviolet backgrounds. The largest charge,for the settings considered, develops on a solar system SQN exposed to a solar X-ray flare. A possible dramatic signal of SQNs in explosive astrophysical events is noted.

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What do exotic equations of state have to offer?

Cited by 9 publications

References 29 publications

X-ray emission from isolated neutron stars

X-ray emission from isolated neutron stars

The magnetar candidate AX J1818.8−1559

Charges on strange quark nuggets in space

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