Invited Review Article: The Chandra X-ray Observatory

Schwartz, D. A.

doi:10.1063/1.4881695

Cited by 20 publications

(7 citation statements)

References 109 publications

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“…The existence of X-ray emission from the nearest, brightest jets in Cen A (Feigelson et al (1981)), 3C273 (Willingale (1981)), and M87 (Schreier et al (1982)) resulted from observations by the Rosat and Einstein X-ray telescopes, each with about 5 angular resolution. The Chandra X-ray observatory (Weisskopf et al (2002), Weisskopf et al (2003), Schwartz (2014)) with its 0. 5 resolution telescope gives a 100-fold increase in 2-dimensional imaging capability.…”

Section: Introductionmentioning

confidence: 99%

The High-energy emission of jetted AGN

Schwartz

2018

Proc. IAU

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Quasars with flat radio spectra and one-sided, arc-second scale, ≈ 100 mJy GHz radio jets are found to have similar scale X-ray jets in about 60% of such objects, even in short 5 to 10 ks Chandra observations. Jets emit in the GHz band via synchrotron radiation, as known from polarization measurements. The X-ray emission is explained most simply, i.e. with the fewest additional parameters, as inverse Compton (iC) scattering of cosmic microwave background (CMB) photons by the relativistic electrons in the jet. With physics based assumptions, one can estimate enthalpy fluxes upwards of 10 46 erg s −1 , sufficient to reverse cooling flows in clusters of galaxies, and play a significant role in the feedback process which correlates the masses of black holes and their host galaxy bulges. On a quasar-by-quasar basis, we can show that the total energy to power these jets can be supplied by the rotational energy of black holes with spin parameters as low as a = 0.3. For a few bright jets at redshifts less than 1, the Fermi gamma ray observatory shows upper limits at 10 Gev which fall below the fluxes predicted by the iC/CMB mechanism, proving the existence of multiple relativistic particle populations. At large redshifts, the CMB energy density is enhanced by a factor (1+z) 4 , so that iC/CMB must be the dominant mechanism for relativistic jets unless their rest frame magnetic field strength is hundreds of micro-Gauss.

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Section: Introductionmentioning

confidence: 99%

The High-energy emission of jetted AGN

Schwartz

2018

Proc. IAU

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“…At MSFC, we are involved in several technology development efforts for higher resolution, larger area, and lighter weight x-ray optics to support future replacement of the 15-year-old Chandra X-ray Observatory, [1][2][3][4] with the next mission to attain sub-arcsecond x-ray imaging. All of these technologies [5][6][7][8][9][10][11][12][13][14][15] share the need to be mounted, assembled, and aligned into modular units for testing or for flight.…”

Section: Introductionmentioning

confidence: 99%

Active figure control effects on mounting strategy for x-ray optics

et al. 2014

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As part of ongoing development efforts at MSFC, we have begun to investigate mounting strategies for highly nested xray optics in both full-shell and segmented configurations. The analytical infrastructure for this effort also lends itself to investigation of active strategies. We expect that a consequence of active figure control on relatively thin substrates is that errors are propagated to the edges, where they might affect the effective precision of the mounting points. Based upon modeling, we describe parametrically, the conditions under which active mounts are preferred over fixed ones, and the effect of active figure corrections on the required number, locations, and kinematic characteristics of mounting points.

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“…We have used the Chandra X-ray observatory (Weisskopf et al (2002), Weisskopf et al (2003), Schwartz(2014)) to carry out a survey for X-ray emission from the radio jets of 54 flatspectrum radio quasars (Marshall et al (2005), Marshall et al (2011)). The parent sample consists of flat-spectrum radio sources with 5 GHz flux density greater than 1 Jy, taken from Murphy, Browne, & Perley(1993) based on VLA observations, or with a flux density at 2.7 GHz greater than 0.34 Jy from ATCA observations by Lovell(1997).…”

Section: Introductionmentioning

confidence: 99%

A survey of X-ray emission from 100 kpc radio jets

Schwartz¹,

Marshall²,

Worrall³

et al. 2014

Proc. IAU

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Abstract. We have completed a Chandra snapshot survey of 54 radio jets that are extended on arcsec scales. These are associated with flat spectrum radio quasars spanning a redshift range z=0.3 to 2.1. X-ray emission is detected from the jet of approximately 60% of the sample objects. We assume minimum energy and apply conditions consistent with the original FeltenMorrison calculations in order to estimate the Lorentz factors and the apparent Doppler factors. This allows estimates of the enthalpy fluxes, which turn out to be comparable to the radiative luminosities.

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Invited Review Article: The Chandra X-ray Observatory

Cited by 20 publications

References 109 publications

The High-energy emission of jetted AGN

The High-energy emission of jetted AGN

Active figure control effects on mounting strategy for x-ray optics

A survey of X-ray emission from 100 kpc radio jets

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