Featured Research

from universities, journals, and other organizations

A Large Spiral Galaxy, NGC 7331, In All Its Splendor

Date:
October 22, 2008
Source:
Calar Alto Observatory-CAHA
Summary:
The spiral galaxy NGC 7331, in Pegasus, can be seen with small telescopes under dark skies as a faint fuzzy spot. It is an island universe similar to our own Galaxy (or maybe somewhat larger) and placed at a distance of 50 million light-years. NGC 7331 was discovered by Wilhelm Herschel in 1784, and it shows all its magnificence in long-exposure photographs taken through large telescopes.

NGC 7331 imaged with the LAICA camera attached to the Zeiss 3.5 m telescope of Calar Alto Observatory.
Credit: Vicent Peris, Gilles Bergond; Image courtesy of Calar Alto Observatory-CAHA

The spiral galaxy NGC 7331, in Pegasus, can be seen with small telescopes under dark skies as a faint fuzzy spot. It is an island universe similar to our own Galaxy (or maybe somewhat larger) and placed at a distance of 50 million light-years. NGC 7331 was discovered by Wilhelm Herschel in 1784, and it shows all its magnificence in long-exposure photographs taken through large telescopes.

This Calar Alto image offers one of the best snapshots ever obtained of this stellar system. It was produced with the camera LAICA attached to the 3.5 m telescope of Calar Alto Observatory. The warped disk of NGC 7331 shows its outstanding spiral structure shinning behind a number of stars belonging to our Galaxy, and in front of a rich background populated by an overwhelming variety of distant galaxies. A good fraction of the field of view is occupied by a thin haze of the ghostly, fuzzy and dusty nebulae known as galactic cirrus.

From galactic cirrus to stars and galaxies

Galactic cirrus are diffuse clouds made up from dust, complex organic molecules and gas. Normal reflection nebulae are strongly lighted by one or several close and hot stars, but galactic cirrus shine due to the reflection of faint and diffuse light coming from the Galaxy as a whole. These structures, better seen in the lower part of the image, have been caught thanks to the darkness of Calar Alto skies, to the quality of the instruments used and thanks to the complex and careful method applied to process the data. Vicent Peris, author of this image, explains that " good data and careful digital processing allow to assert that all diffuse traits in the image are real, with the only exception of the bluish halo around the brightest star".

This image is outstanding first and foremost for the variety of objects that it contains. It will be a good challenge for astronomers to get the nature of each of these bodies, from point-like foreground stars to faint background galaxies, and to the intricate structure of the main galaxy.

Image processing: shapes and colour

Good image processing should not benefit one kind of objects at the expense of others but, instead, it has to aim at an equilibrium. To reach this goal, the image of NGC 7331 has been processed using wavelet techniques, a mathematical procedure that allows the separation of structures present in the image according to their characteristic sizes, hence allowing an individual processing to each level. The final result significantly improves the original quality. That is why this image contains accurate representations of objects as different as the foreground nebulae (belonging, as all individual stars, to our own Galaxy) or the external haloes of small and big galaxies, and the internal structures of all of them.

Colour is, also, a very important side of this photograph. The chromatic balance has been obtained assuming that all the light coming from the main galaxy, as a whole, is white. This reference allows to distinguish which parts of NGC 7331 are bluer or redder. This also makes possible to compare the hue of the main galaxy with that of its smaller neighbours and background objects.

The data

The image was obtained with the LAICA (Large Area Imager for Calar Alto) camera attached to the prime focus of the 3.5 m Zeiss telescope of Calar Alto Observatory. The view corresponds to one of the four detectors of this camera and covers an apparent field of view of 15 15 arcminutes. North is up, East is left [North is right, East is up, if the image is rotated]. The picture is composed from different individual shots through Johnson filters B and V, and Sloan r' (5 images of 10 minutes and 3 of 1 minute both in B and r', plus 3 shots of 10 minutes and 3 of 1 minute in V: 2 hours and 19 minutes as total integration time).

The observations were planned by Vicent Peris, who also processed the images with the software PixInsight. The data were taken by Gilles Bergond.


Story Source:

The above story is based on materials provided by Calar Alto Observatory-CAHA. Note: Materials may be edited for content and length.


Cite This Page:

Calar Alto Observatory-CAHA. "A Large Spiral Galaxy, NGC 7331, In All Its Splendor." ScienceDaily. ScienceDaily, 22 October 2008. <www.sciencedaily.com/releases/2008/10/081020095952.htm>.
Calar Alto Observatory-CAHA. (2008, October 22). A Large Spiral Galaxy, NGC 7331, In All Its Splendor. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2008/10/081020095952.htm
Calar Alto Observatory-CAHA. "A Large Spiral Galaxy, NGC 7331, In All Its Splendor." ScienceDaily. www.sciencedaily.com/releases/2008/10/081020095952.htm (accessed April 17, 2014).

Share This



More Space & Time News

Thursday, April 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Baby Moon 'Peggy' Spotted In Saturn's Rings

New Baby Moon 'Peggy' Spotted In Saturn's Rings

Newsy (Apr. 15, 2014) A bump in the rings could be a half-mile-wide miniature moon. It was found by accident in Cassini probe images. Video provided by Newsy
Powered by NewsLook.com
Americas Glimpse Total Lunar Eclipse

Americas Glimpse Total Lunar Eclipse

AFP (Apr. 15, 2014) A total lunar eclipse, the first since December 2011, took place early Tuesday morning with the Americas getting the best glimpse. Duration: 1:19 Video provided by AFP
Powered by NewsLook.com
NASA Showcases Lunar Eclipse

NASA Showcases Lunar Eclipse

AP (Apr. 15, 2014) Star gazers in parts of North and South America got a rare treat early Tuesday morning - a total eclipse of the moon. (April 15) Video provided by AP
Powered by NewsLook.com
Spacecrafts Could Use Urine As Fuel Source

Spacecrafts Could Use Urine As Fuel Source

Newsy (Apr. 15, 2014) New research says the urea from urine could be recycled for fuel. Urea is filtered out of wastewater when making drinking water. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins