PACS spectrum of Messier 82

Nhsc_nhsc2009-021d_1024

nhsc_nhsc2009-021d November 27th, 2009

Credit: ESA/NASA/JPL-Caltech

This is one of the early spectra obtained with the PACS integral field spectrometer on Herschel. Shown here are spectral images from a region (indicated by the pink box overlaid on the optical image) of the prototype nearby starburst galaxy, M82.

The figure shows spectral images from two important tracers of the ISM: the two insets on the right show intensity maps of the line emission from doubly ionized oxygen ([O III]) and from singly ionized carbon ([C II]). The inset on the lower left shows the ratio [O III]/[C II] of these two lines. This ratio, a diagnostic of ionized gas versus neutral gas and a reflection of the different physical conditions across the galaxy, drops rapidly going outwards from the galaxy centre along the disk. In contrast to this the ratio drops less when going outward in the super-wind direction.

Messier 82 (M82), is a prototype starburst galaxy about 12 million light years away in the constellation of Ursa Major. This galaxy is famous for its spectacular bi-polar outflow or "super-wind", gas and dust driven outwards by stellar winds and supernovae in the galaxies central regions, where stars are produced at a very high rate. M82 is part of an interacting group of galaxies including the large spiral M81 from which material is being stripped by the gravitational interaction with M82.

The physical conditions in the interstellar material (ISM) of such a galaxy vary strongly across the different environments. PACS has the sensitivity and spatial resolution to study these variations in unprecedented detail.

Provider: Herschel Space Observatory

Image Source: https://www.herschel.caltech.edu/image/nhsc2009-021d

Curator: NASA Herschel Science Center, Pasadena, CA, USA

Image Use Policy: http://www.jpl.nasa.gov/imagepolicy/

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Image Details

Image Type
Chart
Object Name
M82 Messier 82
Subject - Local Universe
Galaxy > Activity > Starburst

Distance

Universescale2
11,700,000 light years
Nhsc_nhsc2009-021d_1280
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ID
nhsc2009-021d
Subject Category
C.5.3.3  
Subject Name
M82, Messier 82
Credits
ESA/NASA/JPL-Caltech
Release Date
2009-11-27
Lightyears
11,700,000
Redshift
0.000677
Reference Url
https://www.herschel.caltech.edu/image/nhsc2009-021d
Type
Chart
Image Quality
Distance Notes
Facility
Instrument
Color Assignment
Band
Bandpass
Central Wavelength
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
Equinox
Reference Value
Reference Dimension
Reference Pixel
Scale
Rotation
Coordinate System Projection:
Quality
FITS Header
Notes
Creator (Curator)
NASA Herschel Science Center
URL
http://www.herschel.caltech.edu/
Name
Email
Telephone
Address
1200 E. California Blvd.
City
Pasadena
State/Province
CA
Postal Code
91125
Country
USA
Rights
http://www.jpl.nasa.gov/imagepolicy/
Publisher
Publisher ID
nhsc
Resource ID
Metadata Date
2018-06-21T00:14:40Z
Metadata Version
1.2
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Detailed color mapping information coming soon...

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Universescalefull
11,700,000 light years