ASTRO PUBLISHING 51 glowing gas clouds enshrouding starbirth because it lost its gas long ful source in the core that may be young, massive star clusters. ago, well before this galactic en- spearheading the outbursts. The Although most of the action is hap- counter. Aside from the star forma- radio source may have been pro- pening in NGC 2445, it doesn’t mean tion in NGC 2445, another inte- duced by intense star formation or a the other member of the interacting resting feature that Hubble has un- black hole gobbling up material pair has escaped unscathed. The covered is the dark filaments of gas flowing into the centre. gravitational tussle has stretched in the starburst galaxy’s bright core. It’s not uncommon for star forma- NGC 2444 into an odd shape, yank- Those features may have been tion to occur in the cores of galaxies, ing gas far from the galaxy. NGC formed by outbursts of material. driven by interactions. Plenty of gas 2444 contains old stars and no new Radio observations reveal a power- from galactic encounters flows into
the centre, which can trigger the visible light. However, the NASA/ T his image shows a wide-field birth of new stars. Outflows from ESA/CSA James Webb Space Tele- view around Arp 143. [ESA/Hub- these stars can drive material out, scope will have the infrared vision to ble, Digitized Sky Survey 2. Acknow- but the dust created by these out- peer through the dust covering ledgement: Davide De Martin] bursts blankets the core and other these regions to reveal the young regions throughout NGC 2445, mak- star clusters that are hidden from way, Hubble and Webb will provide ing it difficult for Hubble to study in view in visible-light images. In this the full census of stars in NGC 2445. The census will help astronomers an- Z oom into Arp 143. [NASA, ESA, STScI, and J. Dalcanton (Center for Computa- swer questions such as what the tional Astrophysics/Flatiron Institute, UWashington)] star-formation rate is, how long it takes for stars to form, and whether the starburst in NGC 2445 is fading or just heating up. Studying young, massive star clusters still embedded in their dust and gas cocoons is important for under- standing how star formation affects the evolution of galaxies. Massive stars that explode as supernovae en- rich their environment with chemi- cal elements heavier than hydrogen and helium. The Arp 143 system is listed in a compendium of 338 un- usual-looking interacting galaxies called the Atlas of Peculiar Galaxies published in 1966 by astronomer Halton Arp. MAY-JUNE 2022
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