Click here for an 1800 x 1200 image of NGC 5128 (0.84 Mb)

Click here for a 2400 x 1600 image of NGC 5128 (1.14 Mb)

 

 

 

The Details
Object
NGC 4945 in Centaurus
Optics
Astro-Physics 12" Mak-Cass f/8
Platform
Astro-Physics 1600 Mount with absolute encoders
Camera
FLI 16803 Proline CCD
Filters
Tru-Balance LRGB Filters - Gen 2
Date
May 2015
Location
Las Campanas Observatory, Chile
Exposure
L 17 ea x 900 sec 1x1 bin; RGB 16 ea x 600 sec 1x1 bin
Software
ACP, Maxim DL/CCD, CCDStack 2, Photoshop CS5
Orientation
Field of view: 42' x 28' centered on RA 13h05m20s
DEC-49°29'47" (2000). North angle 359.4°; east 90° CCW from north
Notes
NGC 4945 is a relatively nearby galaxy at only 12 million light-years from Earth and is a member of the Centaurus Group, which includes the spectacular Centaurus A.  Classified as both a starburst and Seyfert Type II galaxy with an extremely energetic nucleus harboring a large black hole, thick obscuring dust along the equatorial plane of this galaxy hides the lurking monster’s environs from view.

Some interesting galaxies are sprinkled across this image.  At 7:30 o’clock from NGC 4945, partially obscured by a bright foreground star, is 13th magnitude NGC 4945A (aka ESO 219-28).  At 11:00 o-clock, just above NGC 4945 is 16th magnitude galaxy ESO 219-25.  Neither of these two galaxies are associated with NGC 4945; in fact they are both background galaxies.  At 2 o’clock is the faint, face-on spiral [CFC97] Cen 5 which was originally thought to be a dwarf galaxy associated with the Centaurus Group, but subsequently found using the HST WFPC2 camera to be a distant background spiral.  The HIPASS (HI Parkes All Sky Survey) survey suggests that the redshift of this galaxy exceeds ∼12,500 km s−1, which was the detection limit of that survey (Publications of the Astronomical Society of the Pacific, Article DOI: 10.1086/426123).  Using a Hubble constant of 74.2 and ignoring the margin of error, this means [CFC97] Cen 5 lies at a distance greater than 168.5 Mpc (549 million light-years) from Earth, or over 42 times more distant than NGC 4945.

The very bright bluish-white star right of NGC 4945 is Xi1 Centauri, a 4th magnitude star of spectral class A0V, the same spectral class as the bright Northern Hemisphere star Vega in the constellation Lyra.

Total exposure time was 12 hours 15 minutes. This image is the result of a collaborative effort between Howard Hedlund of Astro-Physics, Inc. and Dave Jurasevich.

 

 

 

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