Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822

Details Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822 Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jass...25..249s&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 25, no. 3, 249-254

Astronomy and Astrophysics

Astronomy

3

Trgb, Distance Modulus, Near-Infrared, Ngc 6822

Scientific paper

We report the distance modulus of nearby dwarf irregular galaxy NGC 6822 estimated from the so-called Tip of Red-giant Branch (TRGB) method. To detect the apparent magnitudes of the TRGB we use the color-magnitude diagrams (CMDs) and luminosity functions (LFs) in the near-infrared JHK bands. Foreground stars, main-sequence stars, and supergiant stars have been classified on the (g-K,g) plane and removed on the near-infrared CMDs, from which only RGB and AGB stars are remained on the CMDs and LFs. By applying the Savitzky-Golay filter to the obtained LFs and detecting the peak in the second derivative of the observed LFs, we determined the apparent magnitudes of the TRGB. Theoretical absolute magnitudes of the TRGB are estimated from Yonsei-Yale isochrones with the age of 12 Gyr and the metallicity range of -2.0<[Fe/H]<-0.5. The derived values of distance modulus to NGC 6822 are (m-M)=23.35±0.26, 23.20±0.42, and 23.27±0.50 for J, H, and K bands, respectively. Distance modulus in bolometric magnitude is also derived as (m-M)=23.41±0.17. We compare the derived values of the TRGB distance modulus to NGC 6822 in the near-infrared bands with the previous results in other bands.

Affiliated with

Also associated with

No associations

Rating

Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822 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 Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-IR TRGB Distance to Nearby Dwarf Irregular Galaxy NGC 6822 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1335925