IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter (Tim Hawkes)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: IC 4011 · IC 4012 · IC 4021 · IC 4026 · IC 4030 · IC 4033 · IC 4040 · IC 4041 · IC 4042 · IC 4045 · IC 4051 · NGC 4886 · NGC 4889 · NGC 4894 · NGC 4898 · NGC 4907 · NGC 4908

IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter, Tim Hawkes

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IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

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IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

Newtonian (f=1000mm, F = 5.0) OSC RGB image of a small part of the coma cluster comprising frames from moonless Bortle 6 and Bortlle 4 skies. The overall integration was weighted 80% in favour of the frames from the the darker site reflecting their better SNR. A narrowband 'Ha' image of the cluster was also collected using a mono camera using an SII filter at 672 nm. The "Ha" - red channel difference image was then partly added back into the red channel of the RGB image in order to highlight any galaxies within the cluster that were bright in Ha showing as regions of red.

Here red is visible on IC4040 an active - possibly starburst? - barred spiral galaxy at Z =0.026 which is shown near the centre of the image.

At an average distance of about 350 Mly (Z = 0.025) the narrow band emission of Ha at 656nm is shifted by about 16 nm (with variations according to actual recessionary velocities) and thus an SII rather than an Ha filter was used to probe for Ha emission from the coma cluster.

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IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

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IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

IC4040 a lone active HA-bright galaxy in the midst of the coma cluster. Detection with an SII filter

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