Investigating A Made-to-Measure Galaxy

Esahubble_potw2245a_1024

esahubble_potw2245a November 7th, 2022

Credit: ESA/Hubble & NASA, D. Jones Acknowledgement: G. Anand, L. Shatz

The spiral arms of the galaxy NGC 7038 wind languidly across this image from the NASA/ESA Hubble Space Telescope. NGC 7038 lies around 220 million light-years from Earth in the southern constellation Indus. This image portrays an especially rich and detailed view of a spiral galaxy, and exposes a huge number of distant stars and galaxies around it. That’s because it’s made from a combined 15 hours worth of Hubble time focused on NGC 7038 and collecting light. So much data indicates that this is a valuable target, and indeed, NGC 7038 has been particularly helpful to astronomers measuring distances at vast cosmic scales. The distances to astronomical objects are determined using an interconnected chain of measurement techniques called the Cosmic Distance Ladder. Each rung in the ladder is calibrated by earlier steps, based on measurements of objects closer to us. This makes the accuracy of distances at the largest scales dependent on how accurately distances to nearby objects can be determined. Hubble inspected NGC 7038 with its Wide Field Camera 3 to calibrate two of the most common distance measurement techniques: type 1A supernovae and Cepheid variables.  One of Hubble's original science goals was to accurately establish distances to night-sky objects, and over its three decades of operation Hubble’s increasingly precise distance measurements have contributed to one of the most intriguing unsolved problems in astronomy. Distance measurements are used to derive a quantity known as the Hubble constant, which captures how fast the Universe is expanding. As astronomer’s measurements of the Hubble constant have become more precise, their value has become increasingly inconsistent with the value of the Hubble Constant derived from observations of the Big Bang’s afterglow. Astronomers have been unable to explain the mismatch between the two values of the Hubble constant, which suggests that a new discovery in cosmology is waiting to be made. [Image description: An enormous spiral galaxy fills half of the frame, in the centre. It is oval-shaped, with four blue spiral arms winding around it. The galaxy’s centre shines brightly with pale yellow light. Thin strands of orange dust are spread around the centre, following the paths of the arms. Above and below the galaxy, very many small stars and galaxies are visible on the black background.] Links Video of Investigating A Made-to-Measure Galaxy

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/potw2245a/

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 7038
Esahubble_potw2245a_128
 

Position Details

Position (ICRS)
RA = 21h 15m 7.5s
DEC = -47° 13’ 8.4”
Orientation
North is 38.0° CW
Field of View
2.7 x 2.6 arcminutes
Constellation
Indus

Color Mapping

  Telescope Spectral Band Wavelength
Red Hubble (WFC3) Infrared (H) 1.6 µm
Orange Hubble (WFC3) Optical (I) 814.0 nm
Green Hubble (WFC3) Optical (V) 555.0 nm
Blue Hubble (WFC3) Optical (Long pass) 350.0 nm
Spectrum_base
Red
Orange
Green
Blue
Esahubble_potw2245a_1280
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ID
potw2245a
Subject Category
Subject Name
NGC 7038
Credits
ESA/Hubble & NASA, D. Jones Acknowledgement: G. Anand, L. Shatz
Release Date
2022-11-07T06:00:00
Lightyears
Redshift
Reference Url
https://esahubble.org/images/potw2245a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
WFC3, WFC3, WFC3, WFC3
Color Assignment
Red, Orange, Green, Blue
Band
Infrared, Optical, Optical, Optical
Bandpass
H, I, V, Long pass
Central Wavelength
1600, 814, 555, 350
Start Time
Integration Time
Dataset ID
None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
318.7811027032999, -47.2190132913645
Reference Dimension
4059.0, 3859.0
Reference Pixel
2029.5, 1929.5
Scale
-1.108984417488952e-05, 1.108984417488952e-05
Rotation
-38.019999999999939
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
potw2245a
Metadata Date
2022-11-01T20:46:12+01:00
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.