The Cosmic Jewels of Sextans A

Noirlab_iotw2126a_1024

noirlab_iotw2126a June 30th, 2021

Credit: KPNO/NOIRLab/NSF/AURAData obtained and processed by: P. Massey (Lowell Obs.), G. Jacoby, K. Olsen, & C. Smith (AURA/NSF)Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)

This glittering image captured by the Nicholas U. Mayall 4-meter Telescope at Kitt Peak National Observatory, a Program of NSFs NOIRLab, shows the irregular dwarf galaxy Sextans A, which lies around 4.4 million light-years from Earth. This galaxy, which is only a fraction of the size of the Milky Way, has been contorted by successive waves of supernova explosions into the roughly square shape we see from Earth a cosmic jewelry box filled with bright young stars. Sextans A is displayed in style in this gorgeous image, which showcases the irregular shape of this dwarf galaxy. Irregular galaxies such as Sextans A dont have the regular appearance of spiral or elliptical galaxies, but instead display a range of weird and wonderful shapes. These galaxies are relatively small, and they are often susceptible to distortions resulting from close encounters or collisions with larger galaxies sometimes leading to their irregular shapes. Sextans A is particularly small, measuring only about 5000 light-years across. Also watch this video for more insights about the image.

Provider: NOIRLab

Image Source: https://noirlab.edu/public/images/iotw2126a/

Curator: NSF's NOIRLab, Tucson, AZ, USA

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Sextans A
Noirlab_iotw2126a_128
 

Position Details

Position (ICRS)
RA = 10h 10m 60.0s
DEC = -4° 42’ 0.2”
Orientation
North is up
Field of View
15.4 x 8.8 arcminutes
Constellation
Sextans

Color Mapping

  Telescope Spectral Band Wavelength
Purple KPNO-4m (Mosaic I) Optical (U) 355.0 nm
Blue KPNO-4m (Mosaic I) Optical (B) 438.0 nm
Cyan KPNO-4m (Mosaic I) Optical (OIII) 502.0 nm
Green KPNO-4m (Mosaic I) Optical (V) 538.0 nm
Yellow KPNO-4m (Mosaic I) Optical (R) 651.0 nm
Orange KPNO-4m (Mosaic I) Optical (I) 820.0 nm
Red KPNO-4m (Mosaic I) Optical (H-alpha) 657.0 nm
Magenta KPNO-4m (Mosaic I) Optical (SII) 673.0 nm
Spectrum_base
Purple
Blue
Cyan
Green
Yellow
Orange
Red
Magenta
Noirlab_iotw2126a_1280
×
ID
iotw2126a
Subject Category
Subject Name
Sextans A
Credits
KPNO/NOIRLab/NSF/AURAData obtained and processed by: P. Massey (Lowell Obs.), G. Jacoby, K. Olsen, & C. Smith (AURA/NSF)Image processing: T.A. Rector (University of Alaska Anchorage/NSF’s NOIRLab), M. Zamani (NSF’s NOIRLab) & D. de Martin (NSF’s NOIRLab)
Release Date
2021-06-30T12:00:00
Lightyears
Redshift
Reference Url
https://noirlab.edu/public/images/iotw2126a/
Type
Observation
Image Quality
Distance Notes
Facility
Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope, Nicholas U. Mayall 4-meter Telescope
Instrument
Mosaic I, Mosaic I, Mosaic I, Mosaic I, Mosaic I, Mosaic I, Mosaic I, Mosaic I
Color Assignment
Purple, Blue, Cyan, Green, Yellow, Orange, Red, Magenta
Band
Optical, Optical, Optical, Optical, Optical, Optical, Optical, Optical
Bandpass
U, B, OIII, V, R, I, H-alpha, SII
Central Wavelength
355, 438, 502, 538, 651, 820, 657, 673
Start Time
Integration Time
Dataset ID
None, None, None, None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
152.749945113, -4.70005244297
Reference Dimension
3425.0, 1964.0
Reference Pixel
1712.5, 982.0
Scale
-7.50155115424e-05, 7.50155115424e-05
Rotation
-0
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
NSF's NOIRLab
URL
https://noirlab.edu
Name
Email
Telephone
Address
950 North Cherry Ave.
City
Tucson
State/Province
AZ
Postal Code
85719
Country
USA
Rights
Creative Commons Attribution 4.0 International License
Publisher
NSF's NOIRLab
Publisher ID
noirlab
Resource ID
iotw2126a
Metadata Date
2020-06-18T10:12:28+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.