Seeing double

Eso_potw1730a_1024

eso_potw1730a July 24th, 2017

Credit: ESO

Approximately 95 million light-years away, in the southern constellation of Octans (The Octant), lies NGC 7098 — an intriguing spiral galaxy with numerous sets of double features. The first of NGC 7098’s double features is a duo of distinct ring-like structures that loop around the galaxy’s hazy heart. These are NGC 7098’s spiral arms, which have wound themselves around the galaxy’s luminous core. This central region hosts a second double feature: a double bar. NGC 7098 has also developed features known as ansae, visible as small, bright streaks at each end of the central region. Ansae are visible areas of overdensity — they commonly take looping, linear, or circular shapes, and can be found at the extremities of planetary ring systems, in nebulous clouds, and, as is the case with NGC 7098, in parts of galaxies that are packed to the brim with stars. This image is formed from data gathered by the FOcal Reducer and low dispersion Spectrograph (FORS) instrument, installed on ESO’s Very Large Telescope at Paranal Observatory. An array of distant galaxies are also visible throughout the frame, the most prominent being the small, edge-on, spiral galaxy visible to the left of NGC 7098, known as PGC 246235.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/potw1730a/

Curator: European Southern Observatory, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 7098
Subject - Local Universe
Galaxy > Type > Spiral
Eso_potw1730a_128
 

Position Details

Position (ICRS)
RA = 21h 44m 17.1s
DEC = -75° 6’ 40.1”
Orientation
North is up
Field of View
7.2 x 7.4 arcminutes
Constellation
Octans

Color Mapping

  Telescope Spectral Band Wavelength
Red VLT (FORS2) Optical (H-Alpha) 660.0 nm
Red VLT (FORS2) Optical (R) 655.0 nm
Green VLT (FORS2) Optical (v) 557.0 nm
Blue VLT (FORS2) Optical (b) 440.0 nm
Spectrum_base
Red
Red
Green
Blue
Eso_potw1730a_1280
×
ID
potw1730a
Subject Category
C.5.1.1  
Subject Name
NGC 7098
Credits
ESO
Release Date
2017-07-24T06:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/potw1730a/
Type
Observation
Image Quality
Distance Notes
Facility
Very Large Telescope, Very Large Telescope, Very Large Telescope, Very Large Telescope
Instrument
FORS2, FORS2, FORS2, FORS2
Color Assignment
Red, Red, Green, Blue
Band
Optical, Optical, Optical, Optical
Bandpass
H-Alpha, R, v, b
Central Wavelength
660, 655, 557, 440
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
326.071293988, -75.1111483215
Reference Dimension
3435.0, 3538.0
Reference Pixel
1717.5, 1769.0
Scale
-3.49852549373e-05, 3.49852549373e-05
Rotation
-0
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
http://www.eso.org
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
European Southern Observatory
Publisher ID
eso
Resource ID
potw1730a
Metadata Date
2017-07-24T08:43:18+02:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.

 

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