An X‐ray view of the hot circum‐galactic medium

Li, Jiang‐Tao

doi:10.1002/asna.202023775

Cited by 10 publications

(8 citation statements)

References 56 publications

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“…The fraction of physically hostless SGRBs is also highly dependent on the assumed gas profile (especially at large radii). Changing slightly our point of view, for SGRBs that are well constrained to be significantly kicked from their host galaxies (due, for example, to very deep optical follow up), the method described in this work can use the afterglow of highly kicked SGRBs to constrain the galaxy density profile at large radii where other methods are typically ineffective (Li 2020). We argue that either typical SGRBs occur very close to their galactic centres or that the gas density profile is quite flat out to large radii (e.g.…”

Section: O N C L U S I O N Smentioning

confidence: 99%

Constraints on the circumburst environments of short gamma-ray bursts

O’Connor

Beniamini

Kouveliotou

2020

Monthly Notices of the Royal Astronomical Society

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Observational follow up of well localized short gamma-ray bursts (SGRBs) has left $20\!-\!30{{\ \rm per\ cent}}$ of the population without a coincident host galaxy association to deep optical and NIR limits (≳26 mag). These SGRBs have been classified as observationally hostless due to their lack of strong host associations. It has been argued that these hostless SGRBs could be an indication of the large distances traversed by the binary neutron star system (due to natal kicks) between its formation and its merger (leading to an SGRB). The distances of GRBs from their host galaxies can be indirectly probed by the surrounding circumburst densities. We show that a lower limit on those densities can be obtained from early afterglow light curves. We find that ${\lesssim}16{{\ \rm per\ cent}}$ of short GRBs in our sample took place at densities ≲10−4 cm−3. These densities represent the expected range of values at distances greater than the host galaxy’s virial radii. We find that out of the five SGRBs in our sample that have been found to be observationally hostless, none are consistent with having occurred beyond the virial radius of their birth galaxies. This implies one of two scenarios. Either these observationally hostless SGRBs occurred outside of the half-light radius of their host galaxy, but well within the galactic halo, or in host galaxies at moderate to high redshifts (z ≳ 2) that were missed by follow-up observations.

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Section: O N C L U S I O N Smentioning

confidence: 99%

Constraints on the circumburst environments of short gamma-ray bursts

O’Connor

Beniamini

Kouveliotou

2020

Monthly Notices of the Royal Astronomical Society

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“…The extragalactic sky contains many diffuse sources in a variety of shapes and sizes. Recent progress on the study of diffuse emission from galaxies has been presented during the Conference by Jimenez‐Gallardo ; Li ; Paggi ; Vijayan ; Wezgowiec ; Zhang (, ); and specifically, on the study of galaxy clusters by Caglar ; Ettori ; Gaspari ; Hu ; Lagana ; Mao ; Mernier ; Ota ; and Pinto . For recent reviews, see Mernier et al ; Pratt et al ; Simionescu et al ; and Walker et al .…”

Section: Breakthroughs Expected From Athena On the Astrophysics Of Exmentioning

confidence: 99%

The Athena space X‐ray observatory and the astrophysics of hot plasma^†

et al. 2020

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The properties (temperature, density, chemical composition, velocity) of hot astrophysical plasma and the physical processes affecting them (heating/cooling, turbulence, shocks, acceleration) can be probed by high‐resolution X‐ray spectroscopy, to be complemented by high‐spatial‐resolution imaging. The paper presents the status of the European Space Agency's Advanced Telescope for High Energy Astrophysics (Athena) mission, particularly focusing on the science performance of its two focal‐plane instruments for studies of extended X‐ray sources: the wide‐field imager and the X‐ray integral field unit. This paper then provides a brief summary of the breakthroughs expected with Athena on the astrophysics of hot plasma, building on the vast heritage of the discoveries and revolutionary results obtained by Chandra and XMM‐Newton in this field. As of November 12, 2019, Athena successfully concluded its feasibility study, and has since then moved into the definition phase, with a launch date scheduled in the early 2030s.

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“…For our discussion, we focus on the following four instruments: ACIS-S on Chandra (Weisskopf et al 2000), X-Ray Integral Field Unit on Athena (Barcons et al 2015), X-ray Microcalorimeter (Main Array) on Lynx (Gaskin et al 2019), and the Hot Universe Baryon Surveyor (HUBS) (Cui et al 2020). Except for Chandra, the rest of the telescopes are planned mission with enhanced capabilities (Li 2020, see for a comparison). These planned mission have a much higher energy resolution and sensitivity which will enable much more accurate measurements of the metallicity, gas kinematics, etc.…”

Section: Mock Observations For Chandra Athena Lynx and Hubsmentioning

confidence: 99%

X-ray Spectra of Circumgalactic Medium Around Star-Forming Galaxies: Connecting Simulations to Observations

Vijayan,

2021

Preprint

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The hot component of the circum-galactic medium (CGM) around star forming galaxies is detected as diffuse X-ray emission. The X-ray spectra from the CGM depend on the temperature and metallicity of the emitting plasma, providing important information about the feeding and feedback of the galaxy. The observed spectra are commonly fitted using simple 1-Temperature (1-T) or 2-T models. However, the actual temperature distribution of the gas can be complex because of the interaction between galactic outflows and halo gas. Here we demonstrate this by analysing 3-D hydrodynamical simulations of the CGM with a realistic outflow model. We investigate the physical properties of the simulated hot CGM, which shows a broad distribution in density, temperature, and metallicity. By constructing and fitting the simulated spectra, we show that, while the 1-T and 2-T models are able to fit the synthesized spectra reasonably well, the inferred temperature(s) bear little physical meaning. Instead, we propose a log-normal distribution as a more physical model. The log-normal model better fits the simulated spectra while reproducing the gas temperature distribution. We also show that when the star formation rate is high, the spectra inside the bi-conical outflows are distinct from that outside, as outflows are generally hotter and more metal-enriched. Finally, we produce mock spectra for future missions with the eV-level spectral resolution, such as Athena, Lynx, and HUBS.

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An X‐ray view of the hot circum‐galactic medium

Cited by 10 publications

References 56 publications

Constraints on the circumburst environments of short gamma-ray bursts

Constraints on the circumburst environments of short gamma-ray bursts

The Athena space X‐ray observatory and the astrophysics of hot plasma^†

X-ray Spectra of Circumgalactic Medium Around Star-Forming Galaxies: Connecting Simulations to Observations

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An X‐ray view of the hot circum‐galactic medium

Cited by 10 publications

References 56 publications

Constraints on the circumburst environments of short gamma-ray bursts

Constraints on the circumburst environments of short gamma-ray bursts

The Athena space X‐ray observatory and the astrophysics of hot plasma†

X-ray Spectra of Circumgalactic Medium Around Star-Forming Galaxies: Connecting Simulations to Observations

Contact Info

Product

Resources

About

The Athena space X‐ray observatory and the astrophysics of hot plasma^†