From Manu Garcia- a friend from IAC-Institute of Astrophysics of the Canaries[Instituto de Astrofísica de Canarias](ES): “Fusion of four filters”

From Manu Garcia- a friend from IAC-Institute of Astrophysics of the Canaries[Instituto de Astrofísica de Canarias](ES).

The universe around us.
Astronomy, everything you wanted to know about our local universe and never dared to ask.

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NGC 7329. Credit: NASA/ESA Hubble Telescope.
National Aeronautics and Space Administration(US)/European Space Agency [Agence spatiale européenne] [Europäische Weltraumorganisation](EU) Hubble Space Telescope

This stellar eddy is a spiral galaxy called NCG 7329, which has been imaged by Hubble’s Wide Field Camera 3 (WFC3).
National Aeronautics Space Agency(USA)/ European Space Agency [Agence spatiale européenne][Europäische Weltraumorganisation](EU) Hubble Wide Field Camera 3

Creating a colorful image like this using a telescope like Hubble is not as simple as pointing and clicking a camera. Commercial cameras will typically try to capture as much light of all visible wavelengths as possible, to create the most vibrant images possible. In contrast, the raw images collected by Hubble are always monochrome, because astronomers typically want to capture very specific ranges of wavelengths of light at any given time, to make the best and most accurate science possible. To control which wavelengths of light will be collected, Hubble’s cameras are equipped with a wide variety of filters, that only allow certain wavelengths of light to reach camera CCDs (a CCD is the camera’s light sensor; phone cameras have CCDs too!). How are colorful Hubble images possible given that Hubble’s raw images are monochrome? This is achieved by combining multiple different observations of the same object, obtained using different filters. This image, for example, was processed from Hubble observations made using four different filters, each of which spans a different region of the light spectrum, from ultraviolet to optical to infrared. Artists and specialized image processors can make informed judgments about which optical colors best match each filter used. Later, they can color the images taken with that filter accordingly. Finally, the images taken with different filters are stacked together, and voila! The colorful image of a distant galaxy is complete, with colors as representative of reality as possible. Credit: A. Riess et al. NASA/ESA Hubble.

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Gran Telescopio Canarias [Instituto de Astrofísica de Canarias ](ES) sited on a volcanic peak 2,267 metres (7,438 ft) above sea level.

The Instituto de Astrofísica de Canarias(IAC) is an international research centre in Spain which comprises:

The Instituto de Astrofísica the headquarters, which is in La Laguna (Tenerife).

Roque de los Muchachos Observatory | Instituto de Astrofísica de Canarias • IAC(ES)

Tiede Observatory, Tenerife, Canary Islands (ES)

These centres, with all the facilities they bring together, make up the European Northern Observatory (EU).

The IAC is constituted administratively as a Public Consortium, created by statute in 1982, with involvement from the Spanish Government, the Government of the Canary Islands, the University of La Laguna [Universidad de La Laguna](ES) and Spanish National Research Council [Consejo Superior de Investigaciones Científicas] (ES) (CSIC).

The International Scientific Committee (CCI) manages participation in the observatories by institutions from other countries. A Time Allocation Committee (CAT) allocates the observing time reserved for Spain at the telescopes in the IAC’s observatories.

The exceptional quality of the sky over the Canaries for astronomical observations is protected by law. The IAC’s Sky Quality Protection Office (OTPC) regulates the application of the law and its Sky Quality Group continuously monitors the parameters that define observing quality at the IAC Observatories.

The IAC’s research programme includes astrophysical research and technological development projects.

The IAC is also involved in researcher training, university teaching and outreach activities.

The IAC has devoted much energy to developing technology for the design and construction of a large 10.4 metre diameter telescope, the ( Gran Telescopio CANARIAS, GTC), which is sited at The Observatorio del Roque de los Muchachos Observatory | Instituto de Astrofísica de Canarias • IAC(ES).