Discovery of a Binary Active Galactic Nucleus in the Ultraluminous Infrared Galaxy NGC 6240 Using Chandra

@article{Komossa2002DiscoveryOA,
  title={Discovery of a Binary Active Galactic Nucleus in the Ultraluminous Infrared Galaxy NGC 6240 Using Chandra},
  author={Stefanie Komossa and Vadim Burwitz and Guenther Hasinger and P Predehl and Jelle S. Kaastra and Yasushi Ikebe},
  journal={The Astrophysical Journal Letters},
  year={2002},
  volume={582},
  pages={L15 - L19}
}
Ultraluminous infrared galaxies (ULIRGs) are outstanding due to their huge luminosity output in the infrared, which is predominantly powered by superstarbursts and/or hidden active galactic nuclei (AGNs). NGC 6240 is one of the nearest ULIRGs and is considered a key representative of its class. Here we report the first high-resolution imaging spectroscopy of NGC 6240 in X-rays. The observation, performed with the ACIS-S detector aboard the Chandra X-Ray Observatory, led to the discovery of two… 

Figures from this paper

A Chandra Survey of the Nearest Ultraluminous Infrared Galaxies: Obscured Active Galactic Nuclei or Superstarbursts?

We present initial results from a Chandra survey of a complete sample of the eight nearest (z ≤ 0.04) ultraluminous IR galaxies (ULIRGs) and also include the IR-luminous galaxy NGC 6240 for

Subarcsecond Mid-Infrared Observations of NGC 6240: Limitations of Active Galactic Nucleus-Starburst Power Diagnostics

In order to examine the relative importance of powerful starbursts and Compton-thick active galactic nuclei (AGNs) in NGC 6240, we have obtained mid-infrared images and low-resolution spectra of the

Exploring the active galactic nucleus and starburst content of local ultraluminous infrared galaxies through 5–8 μm spectroscopy

We present a 5-8 μm analysis of the Spitzer spectra of 71 ultraluminous infrared galaxies (ULIRGs) with redshift z < 0.15, devoted to the study of the role of active galactic nuclei (AGN) and

Hard X-Ray Emission of the Luminous Infrared Galaxy NGC 6240 as Observed by Nustar

We present a broadband (~0.3−70 keV) spectral and temporal analysis of NuSTAR observations of the luminous infrared galaxy NGC 6240 combined with archival Chandra, XMM-Newton, and BeppoSAX data. NGC

ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240

We present Infrared Space Observatory mid- and far-infrared spectroscopy of the merging galaxy NGC 6240, an object presenting many aspects of importance for the role of star formation and AGN

Characterization of a candidate dual AGN

We present Chandra and optical observations of a candidate dual active galactic nucleus (AGN) discovered serendipitously while searching for recoiling black holes via a cross-correlation between the

Fe K emission in the ultraluminous infrared galaxy Arp 220

Prominent Fe Kα line emission is detected in the XMM‐Newton spectrum of the ultraluminous infrared galaxy Arp 220. The centroid of the line is found at an energy of 6.7 keV and the equivalent width

Elliptical Galaxy in the Making: The Dual Active Galactic Nuclei and Metal-enriched Halo of Mrk 273

A systematic analysis of the X-ray emission from the nearby ultraluminous infrared galaxy Mrk 273 was carried out by combining new 200 ks Chandra data with archived 44 ks data. The active galactic

Dissecting the Extended X-Ray Emission in the Merging Pair NGC 6240: Photoionization and Winds

We present a detailed spectral and imaging analysis of the central 15″ radius (∼7.5 kpc) region of the merger galaxy NGC 6240 that makes use of all the available Chandra-ACIS data (0.3–3 keV

Multiwavelength observations of the triple-peaked AGN Mrk 622

A detailed multiwavelength study of the properties of the triple-peaked active galactic nucleus (AGN) Mrk 622 showing different aspects of the nuclear emission region is presented. Radio, near- and
...

References

SHOWING 1-10 OF 23 REFERENCES

ASCA spectroscopy of the luminous infrared galaxy NGC 6240: X-ray emission from a starburst and a buried active nucleus

We present an X-ray spectroscopic study of the prototype far-infrared galaxy NGC 6240 from ASCA. The soft X-ray spectrum (below 2 keV) shows clear signatures of thermal emission well described by a

What Powers Ultraluminous IRAS Galaxies?

We present an ISO SWS and ISOPHOT-S, mid-infrared spectroscopic survey of 15 ultraluminous IRAS galaxies (LIR ≥ 1012 L☉). We combine the survey results with a detailed case study, based on arcsecond

RXTE observation of NGC 6240: a search for the obscured active nucleus

ABSTRA C T The wide-band energy spectrum of NGC 6240 over the range 0.5‐200 keV is investigated using the RXTE and ASCA data. The RXTE data provide the spectrum beyond the ASCA range (0.5‐10 keV)

Shock Excitation, Nuclear Activity, and Star Formation in NGC 6240

Observations of the IR-excess object NGC 6240 are presented, including (1) broadband BVR, Gunn z, i, H-alpha, forbidden N II (658.3-nm), and K images obtained at ESO and KPNO; (2) 350-690-nm and

The radio emission from the ultraluminous far-infrared galaxy NGC 6240

We present new radio observations of the 'prototypical' ultraluminous far-infrared galaxy NGC 6240, obtained using the Very Large Array (VLA) at lambda = 20 cm in B-configuration and at lambda = 3.6

Stellar Dynamics and the Implications on the Merger Evolution in NGC 6240

We report near-infrared integral field spectroscopy of the luminous merging galaxy NGC 6240. Stellar velocities show that the two K-band peaks separated by 1.″6 are the central parts of inclined,

A MERLIN neutral hydrogen absorption study of the luminous infrared merger NGC 6240

We present neutral hydrogen absorption observations of the luminous infrared merger NGC 6240 using MERLIN with a resolution of 0.2 arcsec. Broad absorption (a few hundred km s) has been found against

The Soft X-Ray Spectrum of Scattering-dominated Active Galactic Nuclei

This paper discusses the properties of scattering-dominated active galactic nuclei (AGNs). We define these to be AGNs for which the direct line of sight to the continuum source is obscured by

Ultramassive (about 10 to the 11th solar mass) dark core in the luminous infrared galaxy NGC 6240

The first complete kinematic maps for the superluminous IR galaxy NGC 6240 are reported. The data reveal two dynamical disks that exhibit radically different rotation and are closely spaced in

Submillimetre-wavelength detection of dusty star-forming galaxies at high redshift

Optical surveys of the global star-formation rate in high-redshift galaxies show a strong peak in activity at a redshift of z ≈ 1.5, which implies that most of the star formation has already been