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CHP Program

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CHP Program

on 20 November 2013

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Transcript of CHP Program

NGC 300
CHP-GCC Astronomy Research Program

Ivan Aguilar
David Buickians
Independent Research in order to familiarize ourselves with CHP
Preliminary Phase
Final Phase
What's Next?!
Carnegie Hubble Program -
Glendale Community College Internship
CHP-GCC Astronomy Research Program
March 5, 2013 - May 30, 2013
Advisors:

The Observatories:
Carnegie Institution of Science
Victoria Scowcroft, PhD

Glendale Community College
Jennifer Krestow, PhD
The Carnegie Hubble Program in conjunction with Glendale Community College established a program to introduce inspiring undergraduates in pursuing a career in the Sciences specifying, but not limiting to Physics, and Astronomy to be exposed, to conduct and to encourage Astrophysics and Astronomical Research.
The mission of the Carnegie Hubble Program (CHP) is to produce a highly accurate and precise measurement of the expansion of the universe, quantified as the Hubble Constant, H0. The current phase of the CHP uses data from the Spitzer Space Telescope to measure the distance to nearby galaxies.
Presentation Format:
1. General Overview
2. Preliminary Phase
3. Principal Phase
4. What's Next?!
General Overview
Concepts
Cepheid Variable Stars
Light Curves - Luminosity versus Time
Magnitudes - Apparent and Absolute
Distance Modulus - Distance in Magnitudes
Extragalactic Distance Ladder - Calibrating distances as we go.
People
Henrietta Leavitt - Period Luminosity Relationship aka Leavitt Law
Edwin Hubble - Hubble Constant, Expanding Universe
Instruments
Spitzer Space Telescope - Warm Mission
Python - Scipy, Numpy, Matplotlib
IRAF, DS9
Principal Phase
Initial Finding of Cepheids
Chose 20 Cepheids
Discussion
Narrowing Down
Going from 20 to 8/5 Cepheids
Ivan's Data
David's Data
Calculate Uncertainties in the Intercept
4 cepheids analyzed and fit a curve
Continue Data Analysis on NGC 300 over Summer
Assist in writing a paper on NGC 300
GRAPHS
What's Wrong?
Victorica Scowcroft
Jennifer Krestow
Barry F. Madore
Andy J. Monson
Jane R. Rigby
& The Entire CHP Group

Special Thanks
This is Saturn
QUESTIONS/ANSWERS
Project Description:
Overview:
Crowded Cepheids
Program in early stages
Addressed
Crowding
Updated Program
Calculated Poisson Noise
Narrowing Down
Going from 8 to 4 Cepheids
[J]
[3.6]
Discussion
Andy Monson's File(FourStar)
Adjusted Photometry settings
Selected the top candidates
Aperture Photometry
Dr. Scowcroft's .fits image file
Still Crowded
Photometric Error
Ivan's Data
How Does This Compare?
Mean Distance from NED : 26.45 mag
Bono et al. (2010a) : 26.64 ± .32 mag
Bono et al. (2010b) : 26.48 ± .29 mag
Saha et al. (2006) : 26.48 ± .03 mag
David's Data
Our Distance: 26.61 mag ± ?
Full transcript