J/AJ/131/912 BR photometry of Fornax dSph center (Olszewski+, 2006)
The nature of the density clump in the Fornax dwarf spheroidal galaxy.
Olszewski E.W., Mateo M., Harris J., Walker M.G., Coleman M.G.,
Da Costa G.S.
<Astron. J. 131, 912 (2006)>
=2006AJ....131..912O 2006AJ....131..912O
ADC_Keywords: Galaxies, photometry ; Photometry, CCD
Keywords: galaxies: dwarf - galaxies: individual (Fornax dSph) -
galaxies: stellar content - Local Group
Abstract:
We have imaged the recently discovered stellar overdensity located
approximately one core radius from the center of the Fornax dwarf
spheroidal galaxy using the Magellan Clay 6.5m telescope with the
Magellan Instant Camera. Superb seeing conditions allowed us to probe
the stellar populations of this overdensity and of a control field
within Fornax to a limiting magnitude of R=26. The color-magnitude
diagram of the overdensity field is virtually identical to that of the
control field, with the exception of the presence of a population
arising from a very short (less than 300Myr in duration) burst of
star formation 1.4Gyr ago.
Description:
The photometric observations were carried out on 2003 December 22 and
23 (UT) using the Magellan Instant Camera (MagIC) on the Magellan Clay
telescope at Las Campanas Observatory.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 70 6647 Photometry of the Fornax clump field
table3.dat 70 6349 Photometry of the Fornax control field
--------------------------------------------------------------------------------
See also:
J/PASP/110/533 : BR photometry of Fornax bright stars (Stetson+ 1998)
J/A+AS/134/59 : Central Fornax Cluster. I Galaxy photometry (Hilker+ 1999)
J/A+AS/134/75 : Central Fornax Cluster. II Galaxy spectroscopy (Hilker+ 1999)
Byte-by-byte Description of file: table2.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- [OMH2006] Star identification number (1)
7 I1 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Seconds of Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Degrees of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 36 F7.2 pix Xpos The X pixel coordinate
38- 44 F7.2 pix Ypos The Y pixel coordinate
46- 51 F6.3 mag Rcmag The Cousins R band magnitude
53- 57 F5.3 mag e_Rcmag Error in Rcmag
59- 64 F6.3 mag B-Rc The (B-Rc) color index
66- 70 F5.3 mag e_B-Rc Error in B-Rc
--------------------------------------------------------------------------------
Note (1): In Simbad, [OMH2006] 2-NNNN for table2.dat
and [OMH2006] 3-NNNNN for table3.dat.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 19-Dec-2006