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Astronomers have discover a previously unknown pair of likely satellite extragalactic nebula orbit theMilky Way . The location of these dwarf wandflower suggests that hundreds of other obscure mini - galaxies could be hiding around us — potentially challenge our understanding of the wandflower ’s edges .
A satellite galaxy is a clump of stars , either in a round blob or a halo - corresponding form , that revolve the Milky Way severally from the eternal rest of the galaxy . Our extragalactic nebula ’s largest - known artificial satellite is theLarge Magellanic Cloud , which concur around 30 billion stars and can be viewed with the nude eye . Other known satellites only contain a few hundred thousand or a twosome of million stars .
The potential dwarf galaxies, Sextans II and Virgo III, were spotted by the Hyper Suprime-Cam (HSC) attached to Japan’s Subaru Telescope.
A2020 censusof known satellite galaxies suggests scientists have witness a maximum of around 60 satellite galaxies orbit the Milky Way . However , there is some uncertainty about the true telephone number of satellite galaxies , mostly because scientists disagree over how large these star bunch should be and how far they should lie from the galactic kernel to be numerate as rightful satellites , according toNASA .
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But most uranologist tally that there should be many more , currently unsung , satellite galaxies out there . Based on our current understanding ofdark matter — which does n’t react with sparkle but interacts gravitationally with visible matter andmakes up around 27 % of the universe ’s quite a little — researchers have long assume that the Milky Way should have around 220 satellite galaxies . Our inability to spot many more of these is often referred to as the " absent satellite problem . "
Satellite galaxies vary widely in terms of size and distance from the galactic center.
In a new field , publish June 8 in the journalPublications of the Astronomical Society of Japan , researchers discovered two new potential satellite galaxies , Sextans II and Virgo III . The satellite are place around 411,000 and 492,000 easy - years from Earth severally and are likely both radical - compact dwarf galaxy ( UCDs ) — assembling of honest-to-god whizz clump tightly together , making them brighter than other planet galaxies .
However , the discoveries do not help oneself solve the missing satellites trouble . rather , the placement and predilection of these potential satellites hints that there are even more satellite galaxies than scientist initially realized . This raises a new job , which researchers have dubbed the " too many satellites problem . "
refer : Does the Milky agency orbit anything ?
Researchers attain the UCDs using the Hyper Suprime - Cam ( HSC ) attach to Japan ’s Subaru Telescope at Mauna Kea Observatories in Hawaii . This musical instrument has spent the last few years searching a part of space around 33 light - years across . base on the estimate 220 orbiter galaxies require by the miss satellites job , an sphere of this sizing should have around four satellite galax on average , Universe Today recently reported .
However , the belated discoveries bring the total number of satellites found by HSC in this sphere to nine . If this concentration of satellites is consistent around the Milky Way , it would mean that there could be at least 500 satellite wandflower around the Milky Way , research worker wrote in astatement .
In the past , scientist have project multiple solution to the missing satellites job , including that some satellite galaxies arehiding behind larger satellitesand that others areso diffuse they are almost impossible to detectwith current applied science . However , these factors are unlikely to be able to explicate an excess of ace , result scientists with no literal way to explain the newfangled issue .
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" The next step is to use a more hefty telescope that captures a broad opinion of the sky , " study co - authorMasahi Chiba , an astronomer at Tohoku University in Japan , said in the statement . This should help clarify how common satellite galaxy really are , he append .
One such scope is the upcomingVera C. Rubin Observatory — a state - of - the - art facility outfit with theworld ’s largest digital television camera , which is expected to amount online in 2025 , Chiba said . " I hope that many new artificial satellite galaxy will be discovered . "
