2013A&A...559A..98V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:45:44

2013A&A...559A..98V - Astronomy and Astrophysics, volume 559A, 98-98 (2013/11-1)

Stellar ages through the corners of the boxy bulge.

VALENTI E., ZOCCALI M., RENZINI A., BROWN T.M., GONZALEZ O.A., MINNITI D., DEBATTISTA V.P. and MAYER L.

Abstract (from CDS):

In some scenarios for the formation of the Milky Way bulge, the stellar population at the edges of the boxy bulge may be younger than those on the minor axis or close to the Galactic center. So far the only bulge region where deep color-magnitude diagrams have been obtained is indeed along the minor axis. To overcome this limitation, we aim to age-date the bulge stellar populations far away from the bulge minor axis. Color-magnitude diagrams and luminosity functions have been obtained from deep near-IR VLT/HAWK-I images taken at the two Southern corners of the boxy bulge, i.e., near the opposite edges of the Galactic bar. The foreground disk contamination has been statistically removed using a pure disk field observed with the same instrument and located approximately at similar Galactic latitudes of the two bulge fields and ∼ 30° in longitude away from the Galactic center. For each bulge field, mean reddening and distance are determined using the position of red clump stars, and the metallicity distribution is derived photometrically using the color distribution of stars in the upper red giant branch. The resulting metallicity distribution function of both fields peaks around [Fe/H]~-0.1dex, with the bulk of the stellar population having a metallicity within the range: -1dex≲[Fe/H]≲+0.4dex, quite similar to that of other inner bulge fields. As for the previously explored inner fields, the color-magnitude diagrams of the two bar fields are consistent with their stellar population being older than ∼10Gyr, with no obvious evidence of younger population. The stellar population of the corners of the boxy bulge appears to be coeval with those within the innermost ∼4° from the Galactic center.

Abstract Copyright:

Journal keyword(s): Galaxy: bulge - Galaxy: formation - methods: observational - techniques: polarimetric

VizieR on-line data: <Available at CDS (J/A+A/559/A98): bul_sc9.dat bul_sc29.dat>

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 938 0
2 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1904 0
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
4 NGC 6440 GlC 17 48 52.67 -20 21 34.5   12.01 10.10     ~ 469 1
5 NAME Baade Window reg 18 03.5 -30 01           ~ 528 3
6 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 465 0
7 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 405 1
8 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0
9 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 869 0
10 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 758 0
11 NAME Galactic Bar reg ~ ~           ~ 892 0
12 NAME Galactic Bulge reg ~ ~           ~ 3387 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:45:44

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