arp 220造句

• In 1982, the first megamaser was discovered in the ultraluminous infrared galaxy Arp 220.
• The ISO also captured merging galaxies about 230 million light-years away and known as Arp 220.
• Many of these objects ( particularly Arp 220 ) are also used as spectral templates for studying high-redshift galaxies.
• Among the objects in this category is Arp 220, one of the best-studied ultraluminous infrared galaxies in the sky.
• The first hydroxyl megamaser was found in 1982 in Arp 220, which is the nearest ultraluminous infrared galaxy to the Milky Way.
• Most objects are best known by their other designations, but a few galaxies are best known by their Arp numbers ( such as Arp 220 ).
• In January 2008, detection of prebiotic molecules methanimine and hydrogen cyanide were reported from the observatory's radio spectroscopy measurements of the distant starburst galaxy Arp 220.
• This luminosity is roughly one hundred million times stronger than the typical maser found in the Milky Way, and so the maser source in Arp 220 was called a megamaser.
• A few hydroxyl megamasers, including Arp 220, have been observed with very long baseline interferometry ( VLBI ), which allows sources to be studied at higher angular resolution.
• In 1984, water maser emission was discovered in NGC 4258 and NGC 1068 that was of comparable strength to the hydroxyl maser in Arp 220, and are as such considered water megamasers.
• Because of the widespread interest in interstellar formaldehyde it has recently been extensively studied, yielding new extragalactic sources, including NGC 253, NGC 520, NGC 660, NGC 891, NGC 2903, NGC 3079, NGC 3628, NGC 6240, NGC 6946, IC 342, IC 860, Arp 55, Arp 220, M82, M83, IRAS 10173 + 0828, IRAS 15107 + 0724, and IRAS 17468 + 1320.