Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-21
IAU Symp.242:366-373,2007
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, IAU 242 on "Astrophysical Masers and Their Environments", editors: J. Chapman and W. Baan
Scientific paper
10.1017/S1743921307013397
OH(1720 MHz) and methanol masers are now recognized to be excellent probes of the interactions of supernova remnants with molecular clouds and tracers of massive star formation, respectively. To better understand the nature of star formation activity in the central region of the Galaxy, we have used these two classes of masers combined with the IRAC and MIPS data to study prominent sites of ongoing star formation in the nuclear disk. The nuclear disk is characterized by massive GMCs with elevated gas temperatures, compared to their dust temperatures. We note an association between methanol masers and a class of mid-infrared ``green sources''. These highly embedded YSOs show enhanced 4.5micron emission due to excited molecular lines. The distribution of methanol masers and supernova remnants suggest a low efficiency of star formation (with the exception of Sgr B2), which we believe is due to an enhanced flux of cosmic ray electrons impacting molecular clouds in the nuclear disk. We also highlight the importance of cosmic rays in their ability to heat molecular clouds, and thus increase the gas temperature.
Arendt Richard G.
Heinke Craig O.
Hewitt John W.
Hinz Joannah L.
Pratap Preethi
No associations
LandOfFree
Masers as Probes of Massive Star Formation in the Nuclear Disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Masers as Probes of Massive Star Formation in the Nuclear Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Masers as Probes of Massive Star Formation in the Nuclear Disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-335572