Upper limits to the water abundance in starburst galaxies
نویسندگان
چکیده
منابع مشابه
Upper limits to the water abundance in starburst galaxies
Aims. We have searched for emission from the 557 GHz ortho-water line in the interstellar medium of six nearby starburst galaxies. Methods. We used the Odin satellite to observe the 110 − 101 transition of o-H2O in the galaxies NGC253, IC342, M82, NGC4258, CenA, and M51. None of the galaxies in our sample was detected. Results. We derive three sigma upper limits to the H2O abundance relative to...
متن کاملUpper Limits to Fluxes of Neutrinos and Gamma-Rays from Starburst Galaxies
Loeb and Waxman have argued that high energy neutrinos from the decay of pions produced in interactions of cosmic rays with interstellar gas in starburst galaxies would be produced with a large enough flux to be observable. Here we obtain an upper limit to the diffuse neutrino flux from starburst galaxies which is a factor of ∼5 lower than the flux which they predict. Compared with predicted fl...
متن کاملAbundance diagnosis of E+A (post-starburst) galaxies
E+A galaxies are characterized as galaxies with strong Balmer absorption lines but without any [O II] or Hα emission lines. The existence of strong Balmer absorption lines means that E+A galaxies have experienced a starburst within the last <1–1.5 Gyr. However, the lack of [O II] or Hα emission lines indicates that E+A galaxies do not have any ongoing star formation. Therefore, E+A galaxies are...
متن کاملSearch for 183 GHz water maser emission in starburst galaxies
We have searched for water vapor emission at 183 GHz, redshifted at 157 GHz and 161 GHz, in the two ultraluminous starburst galaxies Mkn 1014 and VIIZw244. Due to the low energy level of the upper state of the 183 GHz transition (≈ 200K), it is expected that the emission regions are extended, as they are in the Orion or W49Nmolecular cloud cores. Since the warm and dense gas, typical of star-fo...
متن کاملStarburst Galaxies in Clusters
The nature of the starburst phenomenon in galaxies is investigated using a narrow band color system designed to study color evolution in distant clusters. Work on zero redshift, luminous far-IR galaxies, calibrated by starburst models, demonstrates the usefulness of this color system in isolating starburst from normal star-forming colors, and also demonstrates a strong correlation with far-IR c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066621