DISCOVERY OF A SUPERLUMINAL Fe K ECHO AT THE GALACTIC CENTER: THE GLORIOUS PAST OF Sgr A* PRESERVED BY MOLECULAR CLOUDS

@article{Ponti2010DISCOVERYOA,
  title={DISCOVERY OF A SUPERLUMINAL Fe K ECHO AT THE GALACTIC CENTER: THE GLORIOUS PAST OF Sgr A* PRESERVED BY MOLECULAR CLOUDS},
  author={Gabriele Ponti and R. Terrier and A. Goldwurm and Guillaume Belanger and Guillaume Trap},
  journal={The Astrophysical Journal},
  year={2010},
  volume={714},
  pages={732 - 747}
}
We present the result of a study of the X-ray emission from the galactic center (GC) molecular clouds (MCs) within 15 arcmin from Sgr A*. We use XMM-Newton data (about 1.2 Ms of observation time) spanning about eight years. The MC spectra show all the features characteristic of reflection: (1) intense Fe Kα, with equivalent width of about 0.7–1 keV, and the associated Kβ line; (2) flat power-law continuum, and (3) a significant Fe K edge (τ ∼ 0.1–0.3). The diffuse low ionization Fe K emission… 

The X-ray lightcurve of Sagittarius A* over the past 150 years inferred from Fe-Kα line reverberation in Galactic centre molecular clouds

We examine the temporal and spectral properties of nine Fe-Ka bright molecular clouds within about 30 pc of Sgr A*, in order to understand and constrain the primary energising source of the Fe

NEW EVIDENCE FOR HIGH ACTIVITY OF THE SUPERMASSIVE BLACK HOLE IN OUR GALAXY

Prominent K-shell emission lines of neutral iron (hereafter Fe i-K lines) and hard-continuum X-rays from molecular clouds (MCs) in the Sagittarius B (Sgr B) region were found in two separate Suzaku

Molecular clouds: X-ray mirrors of the Galactic nuclear activity

We present the result of a study of the X-ray emission from the Galactic Centre Molecular Clouds (MC), within 15 arcmin from Sgr A*. We use XMM-Newton data spanning about 8 years. We observe an

Echoes of multiple outbursts of Sagittarius A⋆ revealed by Chandra

Context. The relatively rapid spatial and temporal variability of the X-ray radiation from some molecular clouds near the Galactic center shows that this emission component is due to the reflection

Can Sgr A* flares reveal the molecular gas density PDF?

Illumination of dense gas in the Central Molecular Zone (CMZ) by powerful X-ray flares from Sgr A* leads to prominent structures in the reflected emission that can be observed long after the end of

X-ray observations of the hot phase in Sagittarius A*

Context. We analyse 134 ks Chandra ACIS-I observations of the Galactic Centre (GC) performed in July 2011. The X-ray image with the field of view 17 � × 17 � contains the hot plasma surrounding the

An X-ray survey of the central molecular zone: variability of the FeKα emission line

Abstract The bulk of the FeKα emission detected in the central molecular zone (CMZ) is thought to be associated with reflection by the central molecular clouds of enhanced past emission from an

XMM-Newton observations of the Galactic Centre Region - II. The soft-thermal emission

We have extended our earlier study (Heard & Warwick 2013, Paper I) of the X-ray emission emanating from the central 100 pc x 100 pc region of our Galaxy to an investigation of several features

NuSTAR and XMM-Newton observations of the Arches cluster in 2015: fading hard X-ray emission from the molecular cloud

We present results of long Nuclear Spectroscopic Telescope Array (NuSTAR; 200 ks) and XMM–Newton (100 ks) observations of the Arches stellar cluster, a source of bright thermal (kT ∼ 2 keV) X-rays

An X-ray survey of the central molecular zone: Variability of the Fe Kα emission line

There is now abundant evidence that the luminosity of the Galactic super-massive black hole (SMBH) has not always been as low as it is nowadays. The observation of varying non-thermal diffuse X-ray
...

References

SHOWING 1-10 OF 74 REFERENCES

Limits on the Short-Term Variability of Sagittarius A* in the Near-Infrared

The recent detection of a 3 hr X-ray flare by the Chandra X-Ray Observatory has raised the possibility of enhanced emission over a broad range of wavelengths from Sagittarius A*, the suspected 2.6 ×

An X-Ray Face-On View of the Sagittarius B Molecular Clouds Observed with Suzaku

We present a new methodology to derive the positions of the Sgr B molecular clouds (MCs) along the line of sight, as an application study of the Galactic center diffuse X-rays (GCDX). The GCDX is

A Time-Variable X-Ray Echo: Indications of a Past Flare of the Galactic-Center Black Hole

A time-variability study of the neutral iron line flux at 6.40keV in the Sgr B2 region from data of Suzaku and Chandra is presented. The highly ionized iron line at 6.68keV is due to Galactic Center

Time Variability of the Neutral Iron Lines from the Sagittarius B2 Region and Its Implication of a Past Outburst of Sagittarius A

We investigated long-term X-ray behavior from the Sgr B2 complex using archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra, and ASCA. The observed region of the Sgr B2 complex included

ASCA Observations of the Sagittarius B2 Cloud: An X-Ray Reflection Nebula

We present the ASCA results of imaging spectroscopy of the giant molecular cloud Sgr B2. The X-ray spectrum is found to be very peculiar; it exhibits a strong emission line at 6.4 keV, a low-energy

The Sgr B2 X-Ray Echo of the Galactic Center Supernova Explosion that Produced Sgr A East

Using a combination of one-dimensional and three-dimensional hydrodynamic simulations, we have carried out the first in-depth analysis of the remnant's evolution and its various interactions: with

Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way

We report the detection of a variable point source, imaged at L′ (3.8 μm) with the Keck II 10 m telescope's adaptive optics system, that is coincident to within 18 mas (1 σ) of the Galaxy's central

Hard X-ray view of the past activity of Sgr A in a natural Compton mirror

We report the association of the recently discovered hard X-ray source IGR J17475−2822 with the giant molecular cloud Sgr B2 in the Galactic Center region. The broad band (3-200 keV) spectrum of the

Interstellar gas in the Galaxy and the X-ray luminosity of Sgr A in the recent past

Information about the X-ray luminosity of the supermassive black hole located at the Galactic cen- ter (GC), Sgr A, and its temporal variations in the past is imprinted in the scattered emission

SiO EMISSION AS A TRACER OF X-RAY DOMINATED CHEMISTRY IN THE GALACTIC CENTER

We present emission maps of the Sgr A molecular cloud complex at the Galactic center (GC) in the J = 2 → 1 line of SiO observed with the IRAM 30 m telescope at Pico Veleta. Comparing our SiO(2–1)
...