peculiar.galexy.astro
NGC 4921
NGC 4921 is a barred spiral galaxy, though that might be a bit difficult to tell from its lack of clear spiral arms. It is located in the Coma Cluster of galaxies in the constellation Coma Berenices and is about 320 million light-years away. This galaxy has a low rate of star formation and is not making a lot of young, new stars. The blue areas highlighted in the galaxies show where the meager young star population is clustered.
It is near the center of the cluster and it was shown that this galaxy is low in hydrogen. This was determined through spectroscopic techniques, which can determine the elements in the galaxy. Without a lot of hydrogen, which is needed to fuel new star growth, it makes sense that this galaxy does not have a lot of young stars. The interstellar medium might be stripping the galaxy of this important gas and causing the low rate of hydrogen.
The image was taken by the Hubble Space Telescope. It was an image created using three greyscale images that were colorized in Photoshop CC. The images used were:
RED: hst_mos_0439884_acs_wfc_f814w_sci
GREEN: hst_mos_0439884_acs_wfc_f606w_sci
BLUE: hst_mos_0439884_wfc3_uvis_f350lp_sci
Resources:
The image is associated with Hubble proposal 10842: A Cepheid Distance to the Coma Cluster
This image was processed by myself, Alexandra Nachman, on 05/11/21 using data from the Hubble Legacy Archive. Images taken by NASA/ESA/Hubble Space Telescope.
NGC 4921
NGC 4921 is a barred spiral galaxy, though that might be a bit difficult to tell from its lack of clear spiral arms. It is located in the Coma Cluster of galaxies in the constellation Coma Berenices and is about 320 million light-years away. This galaxy has a low rate of star formation and is not making a lot of young, new stars. The blue areas highlighted in the galaxies show where the meager young star population is clustered.
It is near the center of the cluster and it was shown that this galaxy is low in hydrogen. This was determined through spectroscopic techniques, which can determine the elements in the galaxy. Without a lot of hydrogen, which is needed to fuel new star growth, it makes sense that this galaxy does not have a lot of young stars. The interstellar medium might be stripping the galaxy of this important gas and causing the low rate of hydrogen.
The image was taken by the Hubble Space Telescope. It was an image created using three greyscale images that were colorized in Photoshop CC. The images used were:
RED: hst_mos_0439884_acs_wfc_f814w_sci
GREEN: hst_mos_0439884_acs_wfc_f606w_sci
BLUE: hst_mos_0439884_wfc3_uvis_f350lp_sci
Resources:
The image is associated with Hubble proposal 10842: A Cepheid Distance to the Coma Cluster
This image was processed by myself, Alexandra Nachman, on 05/11/21 using data from the Hubble Legacy Archive. Images taken by NASA/ESA/Hubble Space Telescope.