APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3642
Joined: Fri Dec 04, 2009 3:27 am

APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by APOD Robot » Tue Jul 02, 2019 4:07 am

Image NGC 1566: The Spanish Dancer Spiral Galaxy

Explanation: If not perfect, then this spiral galaxy is at least one of the most photogenic. An island universe containing billions of stars and situated about 40 million light-years away toward the constellation of the Dolphinfish (Dorado), NGC 1566 presents a gorgeous face-on view. Classified as a grand design spiral, NGC 1566's shows two prominent and graceful spiral arms that are traced by bright blue star clusters and dark cosmic dust lanes. Numerous Hubble Space Telescope images of NGC 1566 have been taken to study star formation, supernovas, and the spiral's unusually active center. Some of these images, stored online in the Hubble Legacy Archive, were freely downloaded, combined, and digitally processed by an industrious amateur to create the featured image. NGC 1566's flaring center makes the spiral one of the closest and brightest Seyfert galaxies, likely housing a central supermassive black hole wreaking havoc on surrounding stars and gas.

<< Previous APOD This Day in APOD Next APOD >>

Boomer12k
:---[===] *
Posts: 2550
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by Boomer12k » Tue Jul 02, 2019 4:23 am

Should have a great view of BIG nebula there....


:---[===] *

User avatar
Ann
4725 Å
Posts: 9681
Joined: Sat May 29, 2010 5:33 am

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by Ann » Tue Jul 02, 2019 5:33 am

Wow, what a stunning image! :D Thank you, NASA, ESA, Hubble and Leo Shatz!

And what a beauty this galaxy is, not least in the wonderful image that is today's APOD! Catriona Gray of the Philippines is Miss Universe for 2019, but I think that NGC 1566 is a strong contender for Miss Galaxy of the Nearby Universe!
Spacetelescope wrote:

NGC 1566 is an intermediate spiral galaxy, meaning that while it does not have a well defined bar-shaped region of stars at its centre — like barred spirals — it is not quite an unbarred spiral either (heic9902o).
NASA, ESA, Hubble and Leo Shatz





















Yes, NGC 1566 is certainly "a lot less barred" than NGC 1300!




Flocculent galaxy NGC 2841. Hubble/Wikisky.
But there are some similarities between NGC 1566 and NGC 1300. They are both "grand design galaxies", which means that they have two long spiral arms. The opposite of grand design spirals (disregarding ellipticals and irregular galaxies) are flocculent spirals, such as NGC 2841 at left.

To return to NGC 1566 and NGC 1300, they both have small spirals in their cores, and presumably huge supermassive black holes in there. The black hole of NGC 1300 may have a mass of ~70 million solar masses, but I have found no info on the mass of the black hole of NGC 1566. (But according to this not so helpful list, NGC 1566 is listed among galaxies that have the most massive black holes. Please note that the galaxies are listed according to their catalogues, and then for each catalogue, the list starts with the galaxy with the lowest catalogue number. You have to scroll down to the NGC entries to find NGC 1566.)












Anyway, three quarks for Muster Mark, and hooray for the galactic beauty queen, NGC 1566! :D

Ann
Last edited by Ann on Tue Jul 02, 2019 7:01 am, edited 1 time in total.
Color Commentator

DL MARTIN

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by DL MARTIN » Tue Jul 02, 2019 6:09 am

Until we can collapse the 40 million year time disparity between what we perceive and the state of NGC 1566, similar to Shrodinger's Cat, how do we know this galaxy exists?

User avatar
Ann
4725 Å
Posts: 9681
Joined: Sat May 29, 2010 5:33 am

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by Ann » Tue Jul 02, 2019 7:08 am

DL MARTIN wrote:
Tue Jul 02, 2019 6:09 am
Until we can collapse the 40 million year time disparity between what we perceive and the state of NGC 1566, similar to Shrodinger's Cat, how do we know this galaxy exists?
Well, you have probably never met a lot of the people who are members of Starship Asterisk*. How do you know that we exist?

Come to think of it, are you absolutely sure that the world that you can see around you exists at all? Maybe it's all a dream?

I'm joking. But a lot of people have observed NGC 1566 with their own eyes, and many people have photographed it. That's enough for me to accept that NGC 1566 does exist.

Perhaps you mean that NGC 1566 may have been destroyed in the 40 million years it took for its light to reach us? The way I understand it - and my own understanding is all I can refer to, sorry - galaxies aren't destroyed unless they undergo a violent merger. There is apparently a pair of interacting galaxies, NGC 1553 and NGC 1549, which are located moderately close to NGC 1566, but not close enough to affect NGC 1566 much at all in 40 million years.

Ann
Color Commentator

User avatar
orin stepanek
Plutopian
Posts: 4937
Joined: Wed Jul 27, 2005 3:41 pm
Location: Nebraska

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by orin stepanek » Tue Jul 02, 2019 12:49 pm

Pretty Spiral; Shame I would have to stretch it to use as a wallpaper! :|
Orin

Smile today; tomorrow's another day!

sillyworm 2

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by sillyworm 2 » Tue Jul 02, 2019 3:42 pm

Gorgeous Galaxy.Fireworks galore! Just look at that star forming activity.I am also curious as to what the Universe and all the wondrous objects out there look like now after millions and millions of years.I so wish we could just get a glimpse of our own home galaxy.Looking forward to all the knowledge yet to acquire.

spinlock
Ensign
Posts: 19
Joined: Wed Oct 12, 2016 10:51 am
Location: Israel

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by spinlock » Tue Jul 02, 2019 5:35 pm

Actually, all colors are boosted by long exposure and digital processing. It's amazing to realize that even our own Milky Way galaxy is seen as colorless with our own eyes, except few nearby bright stars. It's very likely that if we could look at galaxy like NGC 1566 from within, it would look colorless exactly like our Milky Way.

BDanielMayfield
Don't bring me down
Posts: 2073
Joined: Thu Aug 02, 2012 11:24 am
AKA: Bruce
Location: East Idaho

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by BDanielMayfield » Tue Jul 02, 2019 7:56 pm

DL MARTIN wrote:
Tue Jul 02, 2019 6:09 am
Until we can collapse the 40 million year time disparity between what we perceive and the state of NGC 1566, similar to Shrodinger's Cat, how do we know this galaxy exists?
On astronomical time scales 40 million years is fairly brief. For instance it is only about 1/6th of 1 solar orbit around the core of our galaxy. Sol is now on about its 20th orbit.

We can be confident that NGC 1566 will still exist in 40 million years because the laws of physics are universal and we know of nothing that could reasonably cause such a colossal structure to disappear in such a short time span. It might look a little different in 40 million years, but probably not by much.

Bruce
"Happy are the peaceable ... "

MoreInput
Asternaut
Posts: 3
Joined: Sun Jun 23, 2019 1:00 pm

Re: APOD: NGC 1566: The Spanish Dancer Spiral... (2019 Jul 02)

Post by MoreInput » Tue Jul 02, 2019 8:03 pm

Wonderful galaxy! One of my new favorites.

Mass of the central black hole according to this paper (2015, https://arxiv.org/pdf/1508.02664.pdf, page 13): "The mean BH mass is (5.3 ± 2.9) × 10^6" sun masses. So it is a lighter than NGC 1300's BH. Milky way has 4,1 x 10^6 sun masses.
(Edit: Wrong comparison)