ProtostarsInNGC281 - Revision history

Booker at 22:53, 9 December 2013

2013-12-09T22:53:51Z

2013-12-06T13:53:58Z

Introduction to NGC 281

2013-12-06T13:53:19Z

Spitzer data

2013-12-06T13:49:18Z

Spitzer data

2013-12-06T13:37:32Z

Introduction to NGC 281

2013-12-06T13:36:52Z

Introduction to NGC 281

2013-12-06T13:36:09Z

Introduction to NGC 281

2013-12-06T13:35:21Z

Introduction to NGC 281

2013-12-06T13:34:38Z

2013-12-06T13:33:20Z

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 ===Final Source Selection===
-* Melissa
+NGC 281 East--Identified over 100 possible sources by examining the 70 um FITS file in both DS9 and APT. In APT, we performed  aperture photometry at 70, 100, and 160um of all possible sources. Then, in APT and DS9, we examined several features of the flux profile from each candidate protostar: (1) visual shape of the source and the surrounding dust and gas, (2) XY slices of the flux within the aperture, and (3) value of the full width-half maximum (FWHM). We plotted the distribution of the FWHM's to determine acceptable range of FWHMs for the aperture photometry in each band. Taking all of the above into consideration, we then determined 41 possible sources on the east side with 8 of them providing the most confidence given their shape, radial profile, and XY slices. We called these 8 our "yes" sources, and the other 33 our "maybe" sources. These are most likely sources, but do not inspire as much confidence.
 * Peggy

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 ===Introduction to NGC 281===
-NGC 281 is an active star-forming nebulosity about 2.81± 0.24 kpc or 9200 light-years away (Sato et al. 2008) at a relatively high galactic latitude (<math>\alpha</math>2000=00h52m, <math>\delta</math>2000=+56d34m or l=123.1deg, b= -6.3deg) in the constellation Cassiopeia. It is often referred to as the "PacMan nebula."<br/><br/>
+NGC 281 is an active star-forming nebulosity about 2.81± 0.24 kpc or 9200 light-years away at a relatively high galactic latitude (<math>\alpha</math>2000=00h52m, <math>\delta</math>2000=+56d34m or l=123.1deg, b= -6.3deg) in the constellation Cassiopeia. It is often referred to as the "PacMan nebula."<br/><br/>
 NGC 281 contains several distinct regions:
 *an HII emission region Sharpless 184 of diameter 20 arcminutes containing the young galactic cluster IC 1590 centered about the OB star trapezium system HD5005.<br/>

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 ===Spitzer data===
-Completing our analysis of the properties of the protostars in NGC 281 East and NGC 281 West required the analysis of 24 micron data taken from the Spitzer Space Telescope using MIPS. We obtained this data and photometry from the studies conducted by Scott Wolk et al. Using the Spitzer data and the 70, 100, and 160 microns data from the Hershel Observatory, we were able to create color-color diagrams of both the east and west candidate protostars. In addition, the Spitzer data allowed us to compare the SED slopes between 24um and 70um of the candidate protostars.
+Completing our analysis of the properties of the protostars in NGC 281 East and NGC 281 West required the analysis of 24 micron data taken from the Spitzer Space Telescope using MIPS. We obtained this data and photometry from the studies conducted by Scott Wolk et al. Using the Spitzer data and the 70, 100, and 160 microns data from the Hershel Observatory, we were able to create color-color diagrams of both the east and west candidate protostars. In addition, the Spitzer data allowed us to compare the SED slopes of the candidate protostars.
 ===Source Identification===

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 ===Spitzer data===
-* Melissa
+Completing our analysis of the properties of the protostars in NGC 281 East and NGC 281 West required the analysis of 24 micron data taken from the Spitzer Space Telescope using MIPS. We obtained this data and photometry from the studies conducted by Scott Wolk et al. Using the Spitzer data and the 70, 100, and 160 microns data from the Hershel Observatory, we were able to create color-color diagrams of both the east and west candidate protostars. In addition, the Spitzer data allowed us to compare the SED slopes between 24um and 70um of the candidate protostars.
 ===Source Identification===

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 ===Introduction to NGC 281===
 NGC 281 is an active star-forming nebulosity about 2.81± 0.24 kpc or 9200 light-years away (Sato et al. 2008) at a relatively high galactic latitude (<math>\alpha</math>2000=00h52m, <math>\delta</math>2000=+56d34m or l=123.1deg, b= -6.3deg) in the constellation Cassiopeia. It is often referred to as the "PacMan nebula."<br/><br/>
-'''NGC 281 contains several distinct regions:'''
+NGC 281 contains several distinct regions:
 *an HII emission region Sharpless 184 of diameter 20 arcminutes containing the young galactic cluster IC 1590 centered about the OB star trapezium system HD5005.<br/>
 *Two quite distinct CO molecular clouds:

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 *an HII emission region Sharpless 184 of diameter 20 arcminutes containing the young galactic cluster IC 1590 centered about the OB star trapezium system HD5005.<br/>
 *Two quite distinct CO molecular clouds:
-**NGC281 East: The southeastern CO region (N281A) with local standard of rest (LSR) similar to that of the HII region itself (-30.5 km/s vs. -26.5 km/s). This region contains highly recognizable “pillars of creation.” These pillars are known to contain newborn stars as a result of triggering from the nearby OB star trapezium system.
+**NGC 281 East: The southeastern CO region (N281A) with local standard of rest (LSR) similar to that of the HII region itself (-30.5 km/s vs. -26.5 km/s). This region contains highly recognizable “pillars of creation.” These pillars are known to contain newborn stars as a result of triggering from the nearby OB star trapezium system.
 **NGC 281 West: (N281B), a molecular cloud in the southwestern region with three distinct clumps (NE, NW and S) (Megeath & Wilson 1997). The region is heavily obscured by dust and has a LSR (+44 km/s) quite different from that of its eastern neighbor and the HII region it borders.