{"id":297,"date":"2016-10-12T12:27:59","date_gmt":"2016-10-12T11:27:59","guid":{"rendered":"http:\/\/trafyx.com\/?page_id=297"},"modified":"2016-10-12T12:33:59","modified_gmt":"2016-10-12T11:33:59","slug":"melotte-15-7","status":"publish","type":"page","link":"http:\/\/trafyx.com\/?page_id=297","title":{"rendered":"NGC 5907 and KAZF Extragalactic Globular Clusters"},"content":{"rendered":"
<\/h5>\n
\"NGC<\/a>
NGC 5907\u2014”Splinter” Galaxy in Draco<\/figcaption><\/figure>\n
<\/h5>\n

[layout cols=”2-3″ position=”first” textalign=”left”]<\/p>\n

Image Data<\/h4>\n

Telescope: 10\u2033 Aries f\/15 Maksutov-Cassegrain on Astro-Physics 900GTO German Equatorial
\nAccessories: Moravian G1-0300 as Off-Axis Guider, 0.67X Astro-Physics CCD Telecompressor
\nFocal Length and Resolution: 2692 mm, 0.52″\/pixel
\nInstrument: QSI 532wsg at -20 deg. C
\nExposures: 23×5 min
\nFilter(s): Astrodon\u00a0Clear
\nExposure Date: 10 April, 2011
\nSeeing, FWHM:\u00a01.9″
\nProcessing Software: MaximDL, CCDStack, PixInsight, Photoshop
\nImage Acquisition Software: MaximDL, TheSky6, CCDAutoPilot, FocusMax, PinPoint
\n[\/layout]<\/p>\n

[layout cols=”1-3″ position=”last” textalign=”left”]<\/p>\n

Object Data<\/h4>\n

Constellation:\u00a0Draco
\nType:\u00a0Sb+ Galaxy
\nDistance: 50 Mly
\nDimensions: 12.7′ x 1.4′
\nMagnitude: 11.1 (V)
\n[\/layout]<\/p>\n

KAZF Extragalactic Globular Clusters<\/h4>\n

A few bright globular clusters that are part of the NGC 5907 galaxy have been identified using the Kissler-Patig+Ashman+Zepf+Freeman catalogue and Aladin software. These globular clusters have appeared in the 1999\u00a0publication\u00a0<\/a>during imaging of NGC 5907 with the Hubble Space Telescope.<\/p>\n

\"kazf-clusters\"<\/p>\n

SDSS J151556.56+561558.2 Quasar:<\/p>\n

<\/p>\n

Detailed Information on the quasar from\u00a0NASA\/IPAC Extragalactic Database<\/a>.\u00a0This quasar\u00a0has red shift of 1.875 which translates to the following properties:<\/p>\n

Light Travel-Time : 9.835 Gyr
\nAge at Redshift 1.875206 : 3.464 Gyr
\nAge of Universe : 13.299 Gyr<\/p>\n

Processing Procedure<\/h4>\n

CCDStack:
\n* Calibrate
\n* Register
\n* Normalize
\n* Stack using Median and Poisson Data Rejection.<\/p>\n

PixInsight:
\n* STF
\n* Generate mask to fully block bright stars: MASK-1
\n* Save MASK-1.
\n* Lucy-Richardson deconvolution to bring galaxy details with MASK-1 – with wavelet regularization to suppress noise.
\n* Automatic Background Extraction to remove gradient
\n* Generate mask to block bright stars and bright galaxy core and arms. Do not block noisy galaxy parts. Use cloned input image, blur by removing wavelet layers using A Trous Wavelet Transform then stretch histogram to binarize, save: MASK-2.
\n* Save MASK-2.
\n* A Trous Wavelet Transform to reduce background noise (noise reduction on layers 1 to 3) with MASK-2.
\n* Histogram Stretch
\n* Fixed dust donut using Dynamic Background Extraction
\n* Save image: IMAGE-PNG<\/p>\n

Photoshop:
\n* Use IMAGE-PNG to make gradient for corner erosion procedure to repair elongated stars at corners.
\n* Save gradient to GRADIENT<\/p>\n

PixInsight:
\n* Use GRADIENT as the mask, do erosion to make stars appear round at the corner.
\n* Save image: IMAGE-1
\n* A Trous Wavelet Transform to increase sharpness (increase bias and reduce noise on layers 1 to 2) with MASK-2.
\n* Resize
\n* Final Histogram stretch<\/p>\n

NASA\/ADS Query<\/h4>\n

[wp_nasaads_query_importer_full ads_query_url=”\/cgi-bin\/basic_connect?qsearch=NGC5907″ max_num_authors=”20″ max_records_to_print=”10″]<\/p>\n","protected":false},"excerpt":{"rendered":"

[layout cols=”2-3″ position=”first” textalign=”left”] Image Data Telescope: 10\u2033 Aries f\/15 Maksutov-Cassegrain on Astro-Physics 900GTO German Equatorial Accessories: Moravian G1-0300 as Off-Axis Guider, 0.67X Astro-Physics CCD Telecompressor Focal Length and Resolution: 2692 mm, 0.52″\/pixel Instrument: QSI 532wsg at -20 deg. C Exposures: 23×5 min Filter(s): Astrodon\u00a0Clear Exposure Date: 10 April, 2011 Seeing, FWHM:\u00a01.9″ Processing Software: MaximDL, […]<\/p>\n","protected":false},"author":1,"featured_media":298,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-fullwidth.php","meta":[],"_links":{"self":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/297"}],"collection":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=297"}],"version-history":[{"count":7,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/297\/revisions"}],"predecessor-version":[{"id":306,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/pages\/297\/revisions\/306"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/trafyx.com\/index.php?rest_route=\/wp\/v2\/media\/298"}],"wp:attachment":[{"href":"http:\/\/trafyx.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}