A Marvel of Galactic Morphology

Esahubble_potw2234a_1024

esahubble_potw2234a August 22nd, 2022

Credit: ESA/Hubble & NASA, R. B. Tully, R. Jansen, R. Windhorst

The galaxy featured in this Picture of the Week has a shape unlike many of the galaxies familiar to Hubble. Its thousands of bright stars evoke a spiral galaxy, but it lacks the characteristic ‘winding’ structure. The shining red blossoms stand out as well, twisted by clouds of dust — these are the locations of intense star formation. Yet it also radiates a diffuse glow, much like an elliptical galaxy and its core of older, redder stars. This galactic marvel is known to astronomers as NGC 1156. NGC 1156 is located around 25 million light-years from Earth, in the constellation Aries. It has a variety of different features that are of interest to astronomers. A dwarf irregular galaxy, it’s also classified as isolated, meaning no other galaxies are nearby enough to influence its odd shape and continuing star formation. The extreme energy of freshly formed young stars gives colour to the galaxy, against the red glow of ionised hydrogen gas, while its centre is densely-packed with older generations of stars. Hubble has captured NGC 1156 before — this new image features data from a galactic gap-filling programme simply titled “Every Known Nearby Galaxy”. Astronomers noticed that only three quarters of the galaxies within just over 30 million light-years of Earth had been observed by Hubble in sufficient detail to study the makeup of the stars within them. They proposed that in between larger projects, Hubble could take snapshots of the remaining quarter — including NGC 1156. Gap-filling programmes like this one ensure that the best use is made of Hubble’s valuable observing time. Links Video of A Marvel of Galactic Morphology

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/potw2234a/

Curator: ESA/Hubble, Baltimore, MD, United States

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 1156
Subject - Local Universe
Galaxy > Type > Irregular
Galaxy > Size > Dwarf
Esahubble_potw2234a_128
 

Position Details

Position (ICRS)
RA = 2h 59m 41.7s
DEC = 25° 14’ 18.3”
Orientation
North is 82.1° CW
Field of View
3.0 x 3.1 arcminutes
Constellation
Aries

Color Mapping

  Telescope Spectral Band Wavelength
Orange Hubble (ACS) Optical (I) 814.0 nm
Blue Hubble (ACS) Optical (V) 606.0 nm
Red Hubble (ACS) Optical (NII) 658.0 nm
Red Hubble (WFPC2) Ultraviolet (UV) 300.0 nm
Green Hubble (ACS) Optical (r) 625.0 nm
Green Hubble (WFPC2) Optical (I) 814.0 nm
Spectrum_base
Orange
Blue
Red
Red
Green
Green
Esahubble_potw2234a_1280
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ID
potw2234a
Subject Category
C.5.1.6   C.5.2.2  
Subject Name
NGC 1156
Credits
ESA/Hubble & NASA, R. B. Tully, R. Jansen, R. Windhorst
Release Date
2022-08-22T06:00:00
Lightyears
Redshift
Reference Url
https://esahubble.org/images/potw2234a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
ACS, ACS, ACS, WFPC2, ACS, WFPC2
Color Assignment
Orange, Blue, Red, Red, Green, Green
Band
Optical, Optical, Optical, Ultraviolet, Optical, Optical
Bandpass
I, V, NII, UV, r, I
Central Wavelength
814, 606, 658, 300, 625, 814
Start Time
Integration Time
Dataset ID
None, None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
44.92360177849449, 25.23842230588234
Reference Dimension
3621.0, 3699.0
Reference Pixel
1810.5, 1849.5
Scale
-1.3892006108892685e-05, 1.3892006108892685e-05
Rotation
-82.08
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
https://esahubble.org
Name
Email
Telephone
Address
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr
City
Baltimore
State/Province
MD
Postal Code
21218
Country
United States
Rights
Creative Commons Attribution 4.0 International License
Publisher
ESA/Hubble
Publisher ID
esahubble
Resource ID
potw2234a
Metadata Date
2022-08-18T20:53:14+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.