#今日APOD# 爱因斯坦十字架引力透镜
大多数星系只有一个星系核——这个星系有四个吗？在各种奇怪的结论中，天文学家最终做出了选择，在这张图片中我们并不能看见这个星系的核心。中央的四叶天体发出的光芒，其实都来自其背后同一个类星体。前方星系的引力场将来自这一遥远类星体的光线分解成四个单独的影相。类星体必须位于一个大质量星系的中心后方特定的位置，才会出现海市蜃楼般的幻影。这种效应称作引力透镜效应，图中的特例又被称为爱因斯坦十字架。不过更奇怪的是，这幅爱因斯坦十字架的图像的相对亮度在变化着，偶尔会因前景星系中特定恒星为其加装了引力透镜般而使它亮度增强。
Image Credit & License: J. Rhoads (Arizona State U.) et al., WIYN, AURA, NOIRLab, NSF
翻译：一隻馬鈴薯
#星空##宇宙##天文##科普#
大多数星系只有一个星系核——这个星系有四个吗？在各种奇怪的结论中，天文学家最终做出了选择，在这张图片中我们并不能看见这个星系的核心。中央的四叶天体发出的光芒，其实都来自其背后同一个类星体。前方星系的引力场将来自这一遥远类星体的光线分解成四个单独的影相。类星体必须位于一个大质量星系的中心后方特定的位置，才会出现海市蜃楼般的幻影。这种效应称作引力透镜效应，图中的特例又被称为爱因斯坦十字架。不过更奇怪的是，这幅爱因斯坦十字架的图像的相对亮度在变化着，偶尔会因前景星系中特定恒星为其加装了引力透镜般而使它亮度增强。
Image Credit & License: J. Rhoads (Arizona State U.) et al., WIYN, AURA, NOIRLab, NSF
翻译：一隻馬鈴薯
#星空##宇宙##天文##科普#
Run for an hour in the morning
Ran 9
3 kilometers
Originally planned to run 15 kilometers this morning
Get up early for a cup of coffee
I ate a piece of bread and a banana
After 10 minutes of dynamic stretching
Start running
Five kilometers later
Began to enter a state that I was very obsessed with
That is
Everything around is no longer there
Only breathing
Step into the meditation state rhythmically with breathing.I don't know if this is the state of meditation in the legend.Run through the petrochemical roadRun for an hour in the morning
Ran 9.3 kilometers.Originally planned to run 15 kilometers this morning
Get up early for a cup of coffee
I ate a piece of bread and a banana
After 10 minutes of dynamic stretching
Start running.Five kilometers later
Began to enter a state that I was very obsessed with
That is
Everything around is no longer there
Only breathing
Step into the meditation state rhythmically with breathing.I don't know if this is the state of meditation in the legend.When I ran past the No. 20 bus stop sign on Shihua Road
A sturdy figure suddenly sang: The blue sky and white clouds.The heart rate suddenly reached 160.In the morning after eight o'clock
The sky is still pitch black
Through the street lamp
I saw a black down padded jacket with knees and waist
Black high-heeled boots
Wear a cotton-padded hat on your headShe put one hand in her pocket
While holding a mobile phone in one hand
I followed the mobile phone to karaoke musicThe momentum is like a lead dancer of a square dance.Large size
Even if your state of life has reached the stage of completely freeing yourself
You can't be scary in the dark.Frightened and continued to run
I feel funny when I run
Stop and laugh for a while
Running is no longer in the state at all.After running hastily for an hour
I went home and went to bed after reading a book and fell asleep again.It was noon when I woke up.I slept for so long after returning to the cage
All because of excessive fright.
Ran 9
3 kilometers
Originally planned to run 15 kilometers this morning
Get up early for a cup of coffee
I ate a piece of bread and a banana
After 10 minutes of dynamic stretching
Start running
Five kilometers later
Began to enter a state that I was very obsessed with
That is
Everything around is no longer there
Only breathing
Step into the meditation state rhythmically with breathing.I don't know if this is the state of meditation in the legend.Run through the petrochemical roadRun for an hour in the morning
Ran 9.3 kilometers.Originally planned to run 15 kilometers this morning
Get up early for a cup of coffee
I ate a piece of bread and a banana
After 10 minutes of dynamic stretching
Start running.Five kilometers later
Began to enter a state that I was very obsessed with
That is
Everything around is no longer there
Only breathing
Step into the meditation state rhythmically with breathing.I don't know if this is the state of meditation in the legend.When I ran past the No. 20 bus stop sign on Shihua Road
A sturdy figure suddenly sang: The blue sky and white clouds.The heart rate suddenly reached 160.In the morning after eight o'clock
The sky is still pitch black
Through the street lamp
I saw a black down padded jacket with knees and waist
Black high-heeled boots
Wear a cotton-padded hat on your headShe put one hand in her pocket
While holding a mobile phone in one hand
I followed the mobile phone to karaoke musicThe momentum is like a lead dancer of a square dance.Large size
Even if your state of life has reached the stage of completely freeing yourself
You can't be scary in the dark.Frightened and continued to run
I feel funny when I run
Stop and laugh for a while
Running is no longer in the state at all.After running hastily for an hour
I went home and went to bed after reading a book and fell asleep again.It was noon when I woke up.I slept for so long after returning to the cage
All because of excessive fright.
#每日一天文图#
每日一天文图 （成大物理分站
） Astronomy Picture of the Day
探索宇宙！ 每天一幅不同的影像或照片，并由专业天文学家简明的解说，带你遨游迷人的宇宙。
2021年10月17日
爱因斯坦的重力透镜十字架
图像提供与授权： J. Rhoads （Arizona State U.） et al.， WIYN， AURA， NOIRLab , NSF
说明：大部份的星系只有单一个核心，不过，上面这个星系真的有四个核心吗？ 由于这种答案实在太怪异了，让天文学家断言，在这张影像里，根本就看不见这个星系的核心。 影像中心的苜蓿叶形天体，其实是来自一个位于背景的类星体，由于前景星系的强大重力场，才把遥远类星体的光，分裂成四个独立的影像。 要出现这种类似海市蜃楼的现象，类星体要恰好排列在大质量星系核心的正后方。 此效应称为重力透镜，而上面这种形态的图像称为爱因斯坦十字架。 更有意思的是，这例爱因斯坦十字架的亮度会有变化，会因为前景星系中恒星所造成的重力微透镜效应，亮度偶而会增加。
明日的图片： earthshine fireworks
信息来自：天文实验室（成功大学物理学系;苏汉宗）
每日一天文图 （成大物理分站
） Astronomy Picture of the Day
探索宇宙！ 每天一幅不同的影像或照片，并由专业天文学家简明的解说，带你遨游迷人的宇宙。
2021年10月17日
爱因斯坦的重力透镜十字架
图像提供与授权： J. Rhoads （Arizona State U.） et al.， WIYN， AURA， NOIRLab , NSF
说明：大部份的星系只有单一个核心，不过，上面这个星系真的有四个核心吗？ 由于这种答案实在太怪异了，让天文学家断言，在这张影像里，根本就看不见这个星系的核心。 影像中心的苜蓿叶形天体，其实是来自一个位于背景的类星体，由于前景星系的强大重力场，才把遥远类星体的光，分裂成四个独立的影像。 要出现这种类似海市蜃楼的现象，类星体要恰好排列在大质量星系核心的正后方。 此效应称为重力透镜，而上面这种形态的图像称为爱因斯坦十字架。 更有意思的是，这例爱因斯坦十字架的亮度会有变化，会因为前景星系中恒星所造成的重力微透镜效应，亮度偶而会增加。
明日的图片： earthshine fireworks
信息来自：天文实验室（成功大学物理学系;苏汉宗）
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