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J/ApJ/793/135       Positions and distances of RR Lyrae stars     (Sesar+, 2014)

Stacking the invisibles: a guided search for low-luminosity Milky Way satellites. Sesar B., Banholzer S.R., Cohen J.G., Martin N.F., Grillmair C.J., Levitan D., Laher R.R., Ofek E.O., Surace J.A., Kulkarni S.R., Prince T.A., Rix H.-W. <Astrophys. J., 793, 135 (2014)> =2014ApJ...793..135S (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Galaxies, nearby ; Stars, variable ; Stars, distances Keywords: galaxies: dwarf - Galaxy: halo - Galaxy: structure - stars: variables: RR Lyrae Abstract: Almost every known low-luminosity Milky Way dwarf spheroidal (dSph) satellite galaxy contains at least one RR Lyrae star. Assuming that a fraction of distant (60<dhelio<100 kpc) Galactic halo RR Lyrae stars are members of yet to be discovered low-luminosity dSph galaxies, we perform a guided search for these low-luminosity dSph galaxies. In order to detect the presence of dSph galaxies, we combine stars selected from more than 123 sightlines centered on RR Lyrae stars identified by the Palomar Transient Factory. We find that this method is sensitive enough to detect the presence of Segue 1-like galaxies (MV=-1.5-0.8+0.6, rh=30 pc) even if only ∼20 sightlines were occupied by such dSph galaxies. Yet, when our method is applied to the Sloan Digital Sky Survey Data Release 10 imaging catalog, no signal is detected. An application of our method to sightlines occupied by pairs of close (<200 pc) horizontal branch stars, also did not yield a detection. Thus, we place upper limits on the number of low-luminosity dSph galaxies with half-light radii from 30 pc to 120 pc, and in the probed volume of the halo. Stronger constraints on the luminosity function may be obtained by applying our method to sightlines centered on RR Lyrae stars selected from the Pan-STARRS1 survey, and eventually, from the Large Synoptic Survey Telescope. In Appendix A, we present spectroscopic observations of an RRab star in the Bootes 3 dSph and a light curve of an RRab star near the Bootes 2 dSph. Description: RRab stars used in this work were selected by an automated classification algorithm that uses imaging data provided by the Palomar Transient Factory survey (PTF). The PTF (Law et al. 2009PASP..121.1395L; Rau et al. 2009PASP..121.1334R) is a synoptic survey designed to explore the transient sky. The project utilizes the 48-inch Samuel Oschin Schmidt Telescope on Mount Palomar. Each PTF image covers 7.26 deg2 with a pixel scale of 1.01''. The typical PTF cadence consists of two 60 s exposures separated by ∼1 hr and repeated every one to five days. By 2013 June, PTF observed ∼11000 deg2 of sky at least 25 times in the Mould-R filter (hereafter the R-band filter), and about 2200 deg2 in the SDSS g' filter. PTF photometry is calibrated to an accuracy of about 0.02 mag (Ofek et al. 2012PASP..124...62O, 2012PASP..124..854O) and light curves have relative precision of better than 10 mmag at the bright end, and about 0.2 mag at the survey limiting magnitude of R=20.6 mag. The relative photometry algorithm is described in Ofek et al. (2011, J/ApJ/740/65, see their Appendix A). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 26 123 Positions and distances of RR Lyrae stars
See also: J/A+A/330/515 : RR Lyrae parallaxes + proper motions (Fernley+ 1998) J/A+A/357/871 : RR Lyrae stars in the Sgr dwarf galaxy (Cseresnjes+, 2000) J/AJ/132/1202 : RR Lyrae in Northern Sky Variability Survey (Kinemuchi+, 2006) J/ApJ/740/65 : VLA search for 5GHz radio transients (Ofek+, 2011) J/AJ/146/21 : LINEAR. II. Catalog of RR Lyrae stars (Sesar+, 2013) J/ApJ/763/32 : Galactic halo RRab stars from CSS (Drake+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 12- 20 F9.6 deg DEdeg Declination in decimal degrees (J2000) 22- 26 F5.2 kpc Dist Heliocentric distance (1)
Note (1): Calculated assuming Mr=0.6 as the absolute magnitude of RR Lyrae stars in the PTF R-band. The fractional uncertainty in distance is 6%.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 21-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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