A Case Study Of The Galactic H Ii Region M17 And Environs

Paperback (Print)
Buy New
Buy New from BN.com
$62.02
Used and New from Other Sellers
Used and New from Other Sellers
from $72.24
Usually ships in 1-2 business days
Other sellers (Paperback)
  • All (2) from $72.24   
  • New (2) from $72.24   

More About This Textbook

Overview

Determinations of star formation rates (SFRs) in the Milky Way and other galaxies are fundamentally based on diffuse emission tracers of ionized gas that are sensitive only to massive OB stars. OB stars dominate the ionization of H II regions, yet they make up <1% of young stellar populations. The primary goal of this Thesis is to obtain a detailed census of the young stellar population associated with a bright Galactic HII region and to compare the resulting star formation history with global SFR tracers. The main SFR tracer considered is infrared continuum, since it can be used to derive SFRs in both the Galactic and extragalactic cases. I focus this study on M17, one of the nearest giant H II regions to the Sun (d = 2.1 kpc). The giant molecular cloud associated with M17 is a significant star-forming structure on the Galactic scale, with a complicated star formation history. I report the discovery that M17 is located on the rim of a 20-pc diameter bubble outlining a ∼5 Myr old H II region, suggesting that the formation of the M17 ionizing cluster may have been triggered by the expansion of the bubble. Several dozen intermediate-mass young stellar objects (YSOs) are distributed around the rim of the bubble, indicating even more recent triggered star formation. The star formation rate in the central ionizing cluster is SFRX ∼ 0.01 M&odot; yr-1, derived from the observed X-ray luminosity function of the young stellar population. I conclude with comparisons between SFRX and the SFRs predicted for M17 by widely-used calibrations based on infrared and radio continuum emission. The results imply that current SFR determinations based on ionized gas tracers are uncertain by factors of ∼2--3, due chiefly to large uncertainties in the masses and ionizing photon production rates of O stars and the need to correct for the high binary fractions observed among massive stars.
Read More Show Less

Product Details

  • ISBN-13: 9781243670304
  • Publisher: BiblioLabsII
  • Publication date: 9/7/2011
  • Pages: 284
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.60 (d)

Customer Reviews

Be the first to write a review
( 0 )
Rating Distribution

5 Star

(0)

4 Star

(0)

3 Star

(0)

2 Star

(0)

1 Star

(0)

Your Rating:

Your Name: Create a Pen Name or

Barnes & Noble.com Review Rules

Our reader reviews allow you to share your comments on titles you liked, or didn't, with others. By submitting an online review, you are representing to Barnes & Noble.com that all information contained in your review is original and accurate in all respects, and that the submission of such content by you and the posting of such content by Barnes & Noble.com does not and will not violate the rights of any third party. Please follow the rules below to help ensure that your review can be posted.

Reviews by Our Customers Under the Age of 13

We highly value and respect everyone's opinion concerning the titles we offer. However, we cannot allow persons under the age of 13 to have accounts at BN.com or to post customer reviews. Please see our Terms of Use for more details.

What to exclude from your review:

Please do not write about reviews, commentary, or information posted on the product page. If you see any errors in the information on the product page, please send us an email.

Reviews should not contain any of the following:

  • - HTML tags, profanity, obscenities, vulgarities, or comments that defame anyone
  • - Time-sensitive information such as tour dates, signings, lectures, etc.
  • - Single-word reviews. Other people will read your review to discover why you liked or didn't like the title. Be descriptive.
  • - Comments focusing on the author or that may ruin the ending for others
  • - Phone numbers, addresses, URLs
  • - Pricing and availability information or alternative ordering information
  • - Advertisements or commercial solicitation

Reminder:

  • - By submitting a review, you grant to Barnes & Noble.com and its sublicensees the royalty-free, perpetual, irrevocable right and license to use the review in accordance with the Barnes & Noble.com Terms of Use.
  • - Barnes & Noble.com reserves the right not to post any review -- particularly those that do not follow the terms and conditions of these Rules. Barnes & Noble.com also reserves the right to remove any review at any time without notice.
  • - See Terms of Use for other conditions and disclaimers.
Search for Products You'd Like to Recommend

Recommend other products that relate to your review. Just search for them below and share!

Create a Pen Name

Your Pen Name is your unique identity on BN.com. It will appear on the reviews you write and other website activities. Your Pen Name cannot be edited, changed or deleted once submitted.

 
Your Pen Name can be any combination of alphanumeric characters (plus - and _), and must be at least two characters long.

Continue Anonymously

    If you find inappropriate content, please report it to Barnes & Noble
    Why is this product inappropriate?
    Comments (optional)