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(Final) The HST Treasury Program on the Orion Nebula Cluster


Tonima Tasnim Ananna

on 18 October 2012

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Transcript of (Final) The HST Treasury Program on the Orion Nebula Cluster

The HST Treasury Program on the Orion Nebula Cluster Summer Intern:
Tonima Tasnim Ananna Nearest active site of massive star formation } relevant Scientist, STScI Rising Junior, Bryn Mawr College Data Processing The Detectors On-board the HST Ground based observatories ACS Overlap Advanced Camera for Surveys (ACS) has five filters - B, V, H-alpha, I and Z.
Initial catalogue (Ricci et al, 2008, ApJ) contains: photometry, position, flag (type of object or photometry), comments.
Problems: photometry of very bright and very faint stars, and position and identification of stars. The Inputs Solution:
Did photometry for faint and saturated sources again, recalculated positions for most of the stars again with new, distortion corrected images.
Added new comments.
Checked the overlap sources (very few problems with cross-referencing in ACS). WFPC2 Wide-Field Planetary Camera 2 imaged the orion in four filters: U, B, H-alpha and I.
We have photometry and cross reference of each source (Robberto et al and Manara et al, 2011, in preparation). Photometry
(from ACS catalogue) Images To the Atlas Photometry
(from WFPC2 catalogue) Images To the Atlas NICMOS only images in two filters: J and H.
Initial photometry (M. Anderson.)
Problems: Cross-referencing of binaries, missing frames. Found most of the frames, flagged binaries. NICMOS Photometry
(from NICMOS catalogue) Images To the Atlas { } ACS WFPC2 WFI Wide field Imager (WFI) is a 2.2 m ground based telescope at La Silla Observatory.
It observed the Orion in U, B, V, H-alpha, TiO and I filters.
Instead of several pointings, WFI had a large enough chip to capture the whole Orion in one image.
We (Da Rio et al, 2009, ApJ) obtained photometry for all the sources, I added some upper limits on the magnitudes of some faint sources. Photometry
(from WFI catalogue) Images To the Atlas } WFI ISPI The Infrared Side Port Imager (ISPI) is a 4 m telescope at Cerro Telolo.
It imaged the ONC in J, H and K filters.
We obtained photometry (Robberto et al, 2010, ApJ), set upper limits on faint sources.
Still working on position problems. Photometry
(from ISPI catalogue) Images To the Atlas } ISPI Spectral Energy Distribution NICMOS For each entry we make a matrix of images and save it seperately from the Atlas, so that the images of each object can be easily looked up and analyzed. To the website Some Interesting objects from the Atlas: A Proplyd A Protoplanetary disk To the website Image matrix Atlas page The Outputs: Intro The Project But before we move on to the website... The Orion Nebula (M42)
Kitt Peak National Observatory, 0.9m telescope, Johnson R, V, B and I filters, by Tonima Tasnim Ananna Astronomy Research:
-Analyzing Via Lactea 2 data to test Gravitational Lensing models (Supervised by Ross Fadely, Haverford College).
- Identifying standard candles in Segue 3 from KPNO data (Supervised by Beth Willman, Haverford College).
Physics Research:
-Nanotechnology reearch focused on designing waveguides (Supervised by Xuemei May Cheng, Bryn Mawr College)

Future Plans:
- Graduate School
-Will be spending my Junior Year abraod at Cambridge University exploring theoretical Physics. Physics and Astronomy Double Major The Orion Nebula (M42), HST, NASA Catalogues Mentor:
Massimo Robberto Some features of the ONC (Robberto et al, 2011, in prep):
Dominated by relatively small number of OB stars
Has thousands of young pre-main sequence stars only a few million years old and still shrouded by their protoplanetary disks.
Substantial and variable X-ray outbursts The Orion Nebula The sun is believed to have been formed in harsh conditions found in young clusters like the ONC (Adams, ARAA, 2010). So the ONC was awarded 104 orbits of the HST. All imagers on board the HST were used to image the brightest regions of the ONC to get the most accurate photometry of pre-main sequence objects. Result: There was a lot of data that needed to be made ready for science! http://www-int.stsci.edu/~robberto/GO10246web/main/OrionMasterViewer.html http://addins.wvva.com/blogs/weather/2010/10 Thank you! Aim: Fix problems with catalogues and Atlas! Special thanks to:
Massimo Robberto
Carlo Felice Manara
Nicola Da Rio
Lisa Frattare
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