A Central Stellar Remnant in Puppis A

Spatial extension is an important characteristic for correctly associating γ -ray-emitting sources with their counterparts at other wavelengths and for obtaining an unbiased model of their spectra. We present a new method for quantifying the spatial extension of sources detected by the Large Area Telescope (LAT), the primary science instrument on the Fermi Gamma-ray Space Telescope (Fermi). We perform a series of Monte Carlo simulations to validate this tool and calculate the LAT threshold for detecting the spatial extension of sources. We then test all sources in the second Fermi-LAT catalog for extension. We report the detection of seven new spatially extended sources.

show abstract

“…Two of these have been (Petre et al 1996). (A color version of this figure is available in the online journal.)…”

Section: New Extended Sourcesmentioning

confidence: 99%

SEARCH FOR SPATIALLY EXTENDEDFERMILARGE AREA TELESCOPE SOURCES USING TWO YEARS OF DATA

Landé

Ackermann

Allafort

et al. 2012

ApJ

174

239

View full text Add to dashboard Cite

show abstract

“…The highest resolution X-ray image of the entire source was obtained with ROSAT (HRI) in the energy band from 0.1 to 2 keV (Petre et al 1996).…”

Section: Comparison Between Radio and X-ray Emissionmentioning

confidence: 99%

“…However, the angular resolution and sensitivity of this previous VLA image is not high enough to allow a detailed comparison with improved X-ray images, e.g. that of Petre et al (1996) obtained using ROSAT, or the detailed high resolution Chandra study of the eastern region carried out by Hwang et al (2005). Because of advances in both instrumentation and imaging algorithms for the production of sensitive radio mosaics of large regions, a new set of 20 cm radio observations have been carried out using the VLA.…”

Section: Introductionmentioning

confidence: 98%

New VLA observations of the SNR Puppis A: the radio properties and the correlation with the X-ray emission

Castelletti¹,

Dubner²,

Golap

et al. 2006

A&A

View full text Add to dashboard Cite

Context. High-resolution, high-sensitivity multifrequency radio images of supernova remnants (SNRs) are essential in advancing the understanding of both the global SNR dynamics and particle acceleration mechanisms. Aims. In this paper we report on a new study of the SNR Puppis A based on VLA observations at 1425 MHz; the improvement represents a factor of two in angular resolution and almost ten times in sensitivity compared to the best previous image of Puppis A. This new image is used to compare with re-processed 327 MHz data and ROSAT and Chandra images to investigate morphological and spectral characteristics. Methods. The observations were carried out with the VLA in the DnC and CnB configurations in 2004. After combining with singledish data from Parkes, an angular resolution of 34 × 16 and an rms noise of 0.5 mJy beam −1 , were achieved. Archival VLA data at 327 MHz were also processed. The spectral index distribution was then determined by a direct comparison of the homogenized data at both 327 and 1425 MHz. In addition, to identify different spectral components, tomographic spectral analysis was performed. Results. The new 1425 MHz radio image reveals a highly structured border encircling a diffuse, featureless interior. In particular, the northern half of Puppis A displays a complex structure along the periphery, consisting of short arcs resembling "wave-like" features. These are oriented essentially perpendicular to the shock front on the NE side, but are tangential to the shock on the NW side. A remarkable correspondence between such "wave-like" features and spectral changes is observed. On the other hand, the brightest radio features (located to the E of the SNR and also detected in X-rays) have no counterpart in the spectral index distribution. Based on a uniform compilation of integrated flux densities between 19 and 8400 MHz, a global spectral index α = −0.52± 0.03 (S ∝ ν α ) has been determined. The new 1425 MHz image of Puppis A was compared with the ROSAT X-ray image of the entire SNR and with the resolved arcsec Chandra image of the bright E region. There is good overall agreement between the radio and high resolution X-ray images. At the arcsec level, however, the agreement of the radio and X-ray images is less striking. A noticeable similarity is found between Puppis A, with its E and W extensions, and analogous morphological features observed in the SNR W50. This suggests that Puppis A could be another case of a SNR shaped by the action of energetic jets.

show abstract

“…Puppis A (G260.4-3.4) Given its large diameter, ∼ 1 degree, it's hard to get a full view of Puppis A: the X-ray reference image for Puppis A is still a ROSAT HRI mosaic that was presented in the paper that confirmed it harbored an unresolved central stellar remnant, RX J0822-4300 (Petre et al 1996). This image is usefully combined with radio data as presented in Castelletti et al (2006).…”

Section: N132dmentioning

confidence: 98%

Kinematics of Supernova Remnants: Status of X-Ray Observations

Dewey¹

2010

High-Resolution X-Ray Spectroscopy

View full text Add to dashboard Cite

A supernova (SN) explosion drives stellar debris into the circumstellar material (CSM) filling a region on a scale of parsecs with X-ray emitting plasma. The velocities involved in supernova remnants (SNRs), thousands of km s −1 , can be directly measured with medium and high-resolution X-ray spectrometers and add an important dimension to our understanding of the last stages of the progenitor, the explosion mechanism, and the physics of strong shocks. After touching on the ingredients of SNR kinematics, I present a summary of the still-growing measurement results from SNR X-ray observations. Given the advances in 2D/3D hydrodynamics, data analysis techniques, and especially X-ray instrumentation, it is clear that our view of SNRs will continue to deepen in the decades ahead.Keywords supernova remnants · supernovae · X-ray spectroscopy · X-ray instrumentation

show abstract

A Central Stellar Remnant in Puppis A

Cited by 92 publications

References 27 publications

SEARCH FOR SPATIALLY EXTENDEDFERMILARGE AREA TELESCOPE SOURCES USING TWO YEARS OF DATA

SEARCH FOR SPATIALLY EXTENDEDFERMILARGE AREA TELESCOPE SOURCES USING TWO YEARS OF DATA

New VLA observations of the SNR Puppis A: the radio properties and the correlation with the X-ray emission

Kinematics of Supernova Remnants: Status of X-Ray Observations

Contact Info

Product

Resources

About