Lost and Found: X-ray Telescope Locates Missing Matter

Chandra_249_1024

chandra_249 February 2nd, 2005

Credit: Spectrum: NASA/SAO/CXC/F.Nicastro et al.; Illustration: NASA/CXC/M.Weiss

This illustration shows the absorption of X-rays from the quasar Mkn 421 by two intergalactic clouds of diffuse hot gas, and a portion of the Chandra X-ray spectrum of the quasar. The dips in the spectrum are produced when X-rays of a specific wavelength are absorbed by ions of oxygen in hot gas clouds located at various distances from Earth. The orange dips are caused by relatively nearby clouds which are not shown in the illustration; the green and red dips are from clouds at distances of 150 million and 370 million light years, respectively. These distant clouds are likely part of a predicted diffuse web-like system of hot gas clouds - the cosmic web - from which galaxies and clusters of galaxies are thought to have formed. This discovery is strong evidence that atoms and ions known to be present shortly after the Big Bang, but missing in inventories of matter in the present era, are hiding in the hard-to-see cosmic web.

Image Source: http://chandra.harvard.edu/photo/2005/mkn421/

Curator: Chandra X-ray Observatory, Cambridge, MA, USA

Image Use Policy: http://chandra.harvard.edu/photo/image_use.html

View Options

Image Details

Image Type
Collage
Object Name
Mkn 421
Subject - Local Universe
Galaxy > Activity > AGN > Quasar
Cosmology > Morphology > Cosmic Background

Distance

Universescale3
400,000,000 light years

Position Details

Position (ICRS)
RA = 11h 4m 27.4s
DEC = 38° 12’ 32.4”
Constellation
Ursa Major

Color Mapping

  Telescope Spectral Band Wavelength
Arrow_left_blue Chandra (HRC-LETG) X-ray (X-ray) 826.7 pm
Spectrum_xray1
Arrow_top_blue
Chandra_249_1280
×
ID
249
Subject Category
C.5.3.2.1   C.6.1.3  
Subject Name
Mkn 421
Credits
Spectrum: NASA/SAO/CXC/F.Nicastro et al.; Illustration: NASA/CXC/M.Weiss
Release Date
2005-02-02
Lightyears
400,000,000
Redshift
400,000,000
Reference Url
http://chandra.harvard.edu/photo/2005/mkn421/
Type
Collage
Image Quality
Good
Distance Notes
Facility
Chandra
Instrument
HRC-LETG
Color Assignment
Blue
Band
X-ray
Bandpass
X-ray
Central Wavelength
0.8267
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
2000.0
Reference Value
166.114, 38.209
Reference Dimension
Reference Pixel
Scale
Rotation
Coordinate System Projection:
Quality
Position
FITS Header
Notes
Creator (Curator)
Chandra X-ray Observatory
URL
http://chandra.harvard.edu
Name
Chandra X-ray Observatory Center
Email
cxcpub@cfa.harvard.edu
Telephone
617.496.7941
Address
60 Garden St.
City
Cambridge
State/Province
MA
Postal Code
02138
Country
USA
Rights
http://chandra.harvard.edu/photo/image_use.html
Publisher
Chandra X-ray Observatory Center
Publisher ID
chandra
Resource ID
mkn421_ill_spec.tif
Metadata Date
2013-09-20T11:44:39-04:00
Metadata Version
1.2
×

 

Detailed color mapping information coming soon...

×
Universescalefull
400,000,000 light years