J/AJ/145/149 ALFALFA discovery of Leo P. II. BVR photometry (Rhode+, 2013)
ALFALFA discovery of the nearby gas-rich dwarf galaxy Leo P.
II. Optical imaging observations.
Rhode K.L., Salzer J.J., Haurberg N.C., Van Sistine A., Young M.D.,
Haynes M.P., Giovanelli R., Cannon J.M., Skillman E.D., McQuinn K.B.W.,
Adams E.A.K.
<Astron. J., 145, 149 (2013)>
=2013AJ....145..149R 2013AJ....145..149R
ADC_Keywords: Galaxies, nearby ; Galaxies, photometry ; Photometry, UBVRI
Keywords: galaxies: distances and redshifts - galaxies: dwarf -
galaxies: irregular - galaxies: photometry - galaxies: stellar content
Abstract:
We present results from ground-based optical imaging of a low-mass
dwarf galaxy discovered by the ALFALFA 21cm HI survey. Broadband (BVR)
data obtained with the WIYN 3.5m telescope at Kitt Peak National
Observatory (KPNO) are used to construct color-magnitude diagrams of
the galaxy's stellar population down to Vo∼25. We also use
narrowband Hα imaging from the KPNO 2.1m telescope to identify a
HII region in the galaxy. We use these data to constrain the distance
to the galaxy to be between 1.5 and 2.0Mpc. This places Leo P within
the Local Volume but beyond the Local Group. Its properties are
extreme: it is the lowest-mass system known that contains significant
amounts of gas and is currently forming stars.
Description:
The WIYN Observatory 3.5m telescope was used on 2012 March 26 to image
the field located at the position of an ALFALFA detection at
10h21m45.0s +18d05m01s. These observations revealed an optical
counterpart with a resolved stellar component. All observations were
obtained with the Minimosaic camera through standard BVR broadband
filters under photometric conditions. Total integration times of
30minutes in B, 24minutes in V, and 20minutes in R were achieved,
split between two images for each filter.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 58 82 WIYN broadband photometry of resolved stars in Leo P
--------------------------------------------------------------------------------
See also:
J/AJ/144/4 : Properties of dwarf galaxies in the LG (McConnachie+, 2012)
J/AJ/142/170 : ALFALFA survey: the α.40 HI sce catalog (Haynes+, 2011)
J/ApJ/704/898 : Photometry of the Hercules dwarf galaxy (Sand+, 2009)
J/AJ/133/715 : Dwarf galaxies of the Local Group (Whiting+, 2007)
J/MNRAS/354/708 : Leo I VI photometry (Bellazzini+, 2004)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Star [1/82] Running star number
4- 5 I2 h RAh Hour of Right Ascension (J2000)
7- 8 I2 min RAm Minute of Right Ascension (J2000)
10- 13 F4.1 s RAs Second of Right Ascension (J2000)
15 A1 --- DE- Sign of the Declination (J2000)
16- 17 I2 deg DEd Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 25 F4.1 arcsec DEs Arcsecond of Declination (J2000)
27- 31 F5.2 mag Vomag [21/24.91] V0 corrected magnitude (1)
33- 36 F4.2 mag e_Vomag σ uncertainty in Vomag (1)
38- 42 F5.2 mag (B-V)o [-0.35/1.47] The (B-V)o color index (1)
44- 47 F4.2 mag e_(B-V)o σ uncertainty in (B-V)o (1)
49- 53 F5.2 mag (V-R)o [-0.85/0.92]? The (V-R)o color index (1)
55- 58 F4.2 mag e_(V-R)o ? σ uncertainty in (V-R)o (1)
--------------------------------------------------------------------------------
Note (1): Corrected for Galactic absorption using E(B-V)=0.026 from Schlegel
et al. (1998ApJ...500..525S 1998ApJ...500..525S).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Giovanelli et al., Paper I, 2013AJ....146...15G 2013AJ....146...15G
Skillman et al., Paper III, 2013AJ....146....3S 2013AJ....146....3S
McQuinn et al., Paper IV, 2013AJ....146..145M 2013AJ....146..145M
Bernstein-Cooper et al., Paper V,
(End) Sylvain Guehenneux [CDS] 28-May-2014