gjdonatiello
Pisces VII/Triangulum III – M33’s second dwarf satellite galaxy
Pisces VII/Triangulum III
Credit: Dark Energy Camera Legacy Survey (DECaLS), Gemini Observatory/NOIRLab/NSF/AURA, M.L.M. Collins et al., Giuseppe Donatiello
Pisces VII/Triangulum III (Pisc VII) was discovered in the DESI Legacy Imaging Survey and was shown to be a Local Group dwarf galaxy with follow-up imaging from the 4-m Telescopio Nazionale Galileo.
The distance bound from the red giant branch population placed Pisc VII as either an isolated ultra-faint dwarf galaxy or the second known satellite galaxy of Triangulum (M33). Using deep imaging from Gemini GMOS-N, we have resolved the horizontal branch of Pisc VII, and measure a distance of
916 kpc, making Pisc VII a likely satellite of M33.
We also discuss the presence of blue plume and helium burning stars in the colour–magnitude diagram of Pisc VII that are consistent with ages of ∼1.5 Gyr. If these are truly members of the galaxy, it would transform our understanding of how reionization affects the faintest galaxies. Future deep imaging and dynamics could allow significant insight into both the stellar populations of Pisc VII and the evolution of M33.
Reference papers:
David Martínez-Delgado, Noushin Karim, Emily J E Charles, Walter Boschin, Matteo Monelli, Michelle L M Collins, Giuseppe Donatiello, Emilio J Alfaro, Pisces VII: discovery of a possible satellite of Messier 33 in the DESI legacy imaging surveys, Monthly Notices of the Royal Astronomical Society, Volume 509, Issue 1, January 2022, Pages 16–24, doi.org/10.1093/mnras/stab2797
Michelle L M Collins, Noushin Karim, David Martinez-Delgado, Matteo Monelli, Erik J Tollerud, Giuseppe Donatiello, Mahdieh Navabi, Emily Charles, Walter Boschin, Pisces VII/Triangulum III – M33’s second dwarf satellite galaxy, Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 2, February 2024, Pages 2614–2620, doi.org/10.1093/mnras/stae199
The information and annotations in the image are of scientific utility because they identify the subject and place it in a specific moment. They also indicate the subject of interest. The absence of such information makes the images useless.
Pisces VII/Triangulum III – M33’s second dwarf satellite galaxy
Pisces VII/Triangulum III
Credit: Dark Energy Camera Legacy Survey (DECaLS), Gemini Observatory/NOIRLab/NSF/AURA, M.L.M. Collins et al., Giuseppe Donatiello
Pisces VII/Triangulum III (Pisc VII) was discovered in the DESI Legacy Imaging Survey and was shown to be a Local Group dwarf galaxy with follow-up imaging from the 4-m Telescopio Nazionale Galileo.
The distance bound from the red giant branch population placed Pisc VII as either an isolated ultra-faint dwarf galaxy or the second known satellite galaxy of Triangulum (M33). Using deep imaging from Gemini GMOS-N, we have resolved the horizontal branch of Pisc VII, and measure a distance of
916 kpc, making Pisc VII a likely satellite of M33.
We also discuss the presence of blue plume and helium burning stars in the colour–magnitude diagram of Pisc VII that are consistent with ages of ∼1.5 Gyr. If these are truly members of the galaxy, it would transform our understanding of how reionization affects the faintest galaxies. Future deep imaging and dynamics could allow significant insight into both the stellar populations of Pisc VII and the evolution of M33.
Reference papers:
David Martínez-Delgado, Noushin Karim, Emily J E Charles, Walter Boschin, Matteo Monelli, Michelle L M Collins, Giuseppe Donatiello, Emilio J Alfaro, Pisces VII: discovery of a possible satellite of Messier 33 in the DESI legacy imaging surveys, Monthly Notices of the Royal Astronomical Society, Volume 509, Issue 1, January 2022, Pages 16–24, doi.org/10.1093/mnras/stab2797
Michelle L M Collins, Noushin Karim, David Martinez-Delgado, Matteo Monelli, Erik J Tollerud, Giuseppe Donatiello, Mahdieh Navabi, Emily Charles, Walter Boschin, Pisces VII/Triangulum III – M33’s second dwarf satellite galaxy, Monthly Notices of the Royal Astronomical Society, Volume 528, Issue 2, February 2024, Pages 2614–2620, doi.org/10.1093/mnras/stae199
The information and annotations in the image are of scientific utility because they identify the subject and place it in a specific moment. They also indicate the subject of interest. The absence of such information makes the images useless.