论文标题
评估Nancy Grace Roman太空望远镜休息框架NIR SN IA距离的K频段
Evaluating K bands for Nancy Grace Roman Space Telescope Rest-Frame NIR SN Ia Distances
论文作者
论文摘要
最近，南希·格雷斯·罗曼（Nancy Grace Roman）太空望远镜（罗马）项目提出了向罗马添加另一个过滤器的可能性。基于过滤器工作组的建议，该过滤器可以是K波段过滤器，比当前的reddest F184显着延伸。除其他科学的可能性外，该K滤光片提高了将其静止型NIR中的SNE IA测量到比当前过滤器补体所能达到的更高的红移的可能性。我使用罗马人对NIR SN IA距离进行了简单的调查优化，同时优化了过滤器截止和调查策略。我发现大致最佳的K频段从19,000a-23,000a延伸（曝光时间约为20,000a-23,000a ks滤波器的一半）。移动k比该范围的变红大大增加了热背景，同时移动k频带的蓝色限制了红移范围。因此，我发现任何大型修改都会减少或消除对当前F184的增益。我认为REST-FRAME Y乐队和REST-FRAME J乐队调查。尽管拟议的K频段对于大型休息框频段调查来说太昂贵了，但它将其休息框架的功绩数字提高了59％。
Recently, the Nancy Grace Roman Space Telescope (Roman) Project raised the possibility of adding another filter to Roman. Based on the Filter Working Group's recommendations, this filter may be a K-band filter, extending significantly redder than the current-reddest F184. Among other scientific possibilities, this K filter raises the possibility of measuring SNe Ia in the rest-frame NIR out to higher redshifts than is possible with the current filter complement. I perform a simple survey optimization for NIR SN Ia distances with Roman, simultaneously optimizing both filter cutoffs and survey strategy. I find that the roughly optimal K band extends from 19,000A--23,000A (giving exposure times roughly half that of a 20,000A--23,000A Ks filter). Moving the K much redder than this range dramatically increases the thermal background, while moving the K band much bluer limits the redshift reach. Thus I find any large modification reduces or eliminates the gain over the current F184. I consider both rest-frame Y band and rest-frame J band surveys. Although the proposed K band is too expensive for a large rest-frame Y band survey, it increases the rest-frame J Figure of Merit by 59%.
