by neufer » Mon Jul 27, 2009 12:31 pm
Indigo_Sunrise wrote:According to
this article,
"The companion galaxy that looks as if it's playing peek-a-boo through the larger galaxy could have plunged through, poking a hole," Helou said. "But we don't know this for sure. It could also just happen to be aligned with a gap in the arms."
The description for today's APOD states, in part, "... the gravity of the companion galaxy appears to be reshaping the larger galaxy as it is slowly being destroyed itself."
My question is: can it be determined if the 'companion galaxy' actually does have a gravitational effect on NGC 1097? Or whether the companion it is just fortuitously aligned, leading to this spectacular view. (*I suspect it may have something to do with red shifts of wavelengths(?), but I do not know enough about that.....)
A 2006 APOD addresses this issue:
http://apod.nasa.gov/apod/ap061201.html wrote:
Explanation: A smaller companion seems wrapped in the spiral arms of enigmatic galaxy NGC 1097. The faint details revealed include hints of a mysterious jet emerging toward the top of the view. Seen to be about 42,000 light-years from the larger galaxy's center, the companion galaxy is gravitationally interacting with the spiral and will ultimately merge with it. NGC 1097's center also harbors a massive black hole. NGC 1097 is located about 45 million light-years away in the chemical constellation Fornax.
- The Spider and the Fly (1829) by Mary Howitt
Will you walk into my parlour?" said the Spider to the Fly,
'Tis the prettiest little parlour that ever you did spy;
The way into my parlour is up a winding stair,
And I've a many curious things to shew when you are there."
Oh no, no," said the little Fly, "to ask me is in vain,
For who goes up your winding stair can ne'er come down again."
"I'm sure you must be weary, dear, with soaring up so high;
Will you rest upon my little bed?" said the Spider to the Fly.
"There are pretty curtains drawn around; the sheets are fine and thin,
And if you like to rest awhile, I'll snugly tuck you in!"
Oh no, no," said the little Fly, "for I've often heard it said,
They never, never wake again, who sleep upon your bed!"
Said the cunning Spider to the Fly, " Dear friend what can I do,
To prove the warm affection I 've always felt for you?
I have within my pantry, good store of all that's nice;
I'm sure you're very welcome -- will you please to take a slice?"
"Oh no, no," said the little Fly, "kind Sir, that cannot be,
I've heard what's in your pantry, and I do not wish to see!"
"Sweet creature!" said the Spider, "you're witty and you're wise,
How handsome are your gauzy wings, how brilliant are your eyes!
I've a little looking-glass upon my parlour shelf,
If you'll step in one moment, dear, you shall behold yourself."
"I thank you, gentle sir," she said, "for what you 're pleased to say,
And bidding you good morning now, I'll call another day."
The Spider turned him round about, and went into his den,
For well he knew the silly Fly would soon come back again:
So he wove a subtle web, in a little corner sly,
And set his table ready, to dine upon the Fly.
Then he came out to his door again, and merrily did sing,
"Come hither, hither, pretty Fly, with the pearl and silver wing;
Your robes are green and purple -- there's a crest upon your head;
Your eyes are like the diamond bright, but mine are dull as lead!"
Alas, alas! how very soon this silly little Fly,
Hearing his wily, flattering words, came slowly flitting by;
With buzzing wings she hung aloft, then near and nearer drew,
Thinking only of her brilliant eyes, and green and purple hue --
Thinking only of her crested head -- poor foolish thing! At last,
Up jumped the cunning Spider, and fiercely held her fast.
He dragged her up his winding stair, into his dismal den,
Within his little parlour -- but she ne'er came out again!
[quote="Indigo_Sunrise"]According to [url=http://www.space.com/scienceastronomy/090723-spitzer-galaxy.html]this article[/url],
[quote]"The companion galaxy that looks as if it's playing peek-a-boo through the larger galaxy could have plunged through, poking a hole," Helou said. "But we don't know this for sure. It could also just happen to be aligned with a gap in the arms." [/quote]
The description for today's APOD states, in part, "... the gravity of the companion galaxy appears to be reshaping the larger galaxy as it is slowly being destroyed itself."
My question is: can it be determined if the 'companion galaxy' actually does have a gravitational effect on NGC 1097? Or whether the companion it is just fortuitously aligned, leading to this spectacular view. (*I suspect it may have something to do with red shifts of wavelengths(?), but I do not know enough about that.....)[/quote]
A 2006 APOD addresses this issue:
[quote=" http://apod.nasa.gov/apod/ap061201.html"]
Explanation: A smaller companion seems wrapped in the spiral arms of enigmatic galaxy NGC 1097. The faint details revealed include hints of a mysterious jet emerging toward the top of the view. Seen to be about 42,000 light-years from the larger galaxy's center, the companion galaxy is gravitationally interacting with the spiral and will ultimately merge with it. NGC 1097's center also harbors a massive black hole. NGC 1097 is located about 45 million light-years away in the chemical constellation Fornax. [/quote]
[list][color=#0000FF]The Spider and the Fly (1829) by Mary Howitt
Will you walk into my parlour?" said the Spider to the Fly,
'Tis the prettiest little parlour that ever you did spy;
The way into my parlour is up a winding stair,
And I've a many curious things to shew when you are there."
Oh no, no," said the little Fly, "to ask me is in vain,
For who goes up your winding stair can ne'er come down again."
"I'm sure you must be weary, dear, with soaring up so high;
Will you rest upon my little bed?" said the Spider to the Fly.
"There are pretty curtains drawn around; the sheets are fine and thin,
And if you like to rest awhile, I'll snugly tuck you in!"
Oh no, no," said the little Fly, "for I've often heard it said,
They never, never wake again, who sleep upon your bed!"
Said the cunning Spider to the Fly, " Dear friend what can I do,
To prove the warm affection I 've always felt for you?
I have within my pantry, good store of all that's nice;
I'm sure you're very welcome -- will you please to take a slice?"
"Oh no, no," said the little Fly, "kind Sir, that cannot be,
I've heard what's in your pantry, and I do not wish to see!"
"Sweet creature!" said the Spider, "you're witty and you're wise,
How handsome are your gauzy wings, how brilliant are your eyes!
I've a little looking-glass upon my parlour shelf,
If you'll step in one moment, dear, you shall behold yourself."
"I thank you, gentle sir," she said, "for what you 're pleased to say,
And bidding you good morning now, I'll call another day."
The Spider turned him round about, and went into his den,
For well he knew the silly Fly would soon come back again:
So he wove a subtle web, in a little corner sly,
And set his table ready, to dine upon the Fly.
Then he came out to his door again, and merrily did sing,
"Come hither, hither, pretty Fly, with the pearl and silver wing;
Your robes are green and purple -- there's a crest upon your head;
Your eyes are like the diamond bright, but mine are dull as lead!"
Alas, alas! how very soon this silly little Fly,
Hearing his wily, flattering words, came slowly flitting by;
With buzzing wings she hung aloft, then near and nearer drew,
Thinking only of her brilliant eyes, and green and purple hue --
Thinking only of her crested head -- poor foolish thing! At last,
Up jumped the cunning Spider, and fiercely held her fast.
He dragged her up his winding stair, into his dismal den,
Within his little parlour -- but she ne'er came out again![/color][/list]