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J/AJ/141/113 HII regions of M51 and NGC 4449 (Gutierrez+, 2011)
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Beginning of ReadMe :J/AJ/141/113 HII regions of M51 and NGC 4449 (Gutierrez+, 2011)
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Properties of the HII region populations of M51 and NGC 4449 from Halpha
images with the Advanced Camera for Surveys on the Hubble Space Telescope.
Gutierrez L., Beckman J.E., Buenrostro V.
<Astron. J., 141, 113 (2011)>
=2011AJ....141..113G
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ADC_Keywords: Galaxies, nearby ; H II regions ; Morphology
Keywords: galaxies: structure - H II regions - ISM: general
Abstract:
We have used images from the Advanced Camera for Surveys on the Hubble
Space Telescope in Halpha, and in the neighboring continuum, to
produce flux-calibrated images of the large spiral galaxy M51 and the
dwarf irregular NGC 4449. From these images, we have derived the
absolute luminosities in Halpha, the areas, and the positions with
respect to the galactic centers as reference points of over 2600 HII
regions in M51 and over 270 HII regions in NGC 4449.
Description:
The images of M51 (NGC 5194) and its companion NGC 5195 were observed
with the wide field camera of the ACS on HST in 2005 January within
the program 10452 (PI: S. Beckwith, Hubble Heritage Team). The
observations consisted of six pointings through two broadband filters:
F555W (close to standard V) and F814W (close to I), and a narrowband
Halpha filter, F658N.
The images of NGC 4449 were also taken from the HST archive. They were
taken during 2005 November through the same filters as those used for
M51, within the program GO 10585 (PI: A. Aloisi).
Objects:
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RA (2000) DE Designation(s) (table)
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13 29 52.70 +47 11 42.9 M51 = NGC 5194 (table2)
12 28 11.12 +44 05 36.8 NGC 4449 = UGC 7592 (table3)
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