J/ApJ/885/161 90 cepheid candidates nearby NGC 6814 (Bentz+, 2019)
A Cepheid-based Distance to the Seyfert Galaxy NGC 6814.
Bentz M.C., Ferrarese L., Onken C.A., Peterson B.M., Valluri M.
<Astrophys. J., 885, 161 (2019)>
=2019ApJ...885..161B 2019ApJ...885..161B
ADC_Keywords: Galaxies, Seyfert; Stars, variable; Photometry, HST; Optical
Keywords: Cepheid distance ; Seyfert galaxies ; Spiral galaxies ;
AGN host galaxies
Abstract:
We present a Cepheid-based distance to the nearby Seyfert galaxy
NGC6814 from Hubble Space Telescope observations. We obtained F555W
and F814W imaging over the course of 12 visits with logarithmic time
spacing in 2013 August-October. We detected and made photometric
measurements for 16469 unique sources across all images in both
filters, from which we identify 90 excellent Cepheid candidates
spanning a range of periods of 13-84days. We find evidence for
incompleteness in the detection of candidates at periods <21days.
Based on the analysis of Cepheid candidates above the incompleteness
limit, we determine a distance modulus for NGC6814 relative to the LMC
of µrel,LMC=13.200-0.031+0.031mag. Adopting the recent
constraint of the distance modulus to the LMC determined by
Pietrzynski et al., we find m-M=31.677-0.041+0.041 which gives a
distance of 21.65±0.41Mpc to NGC6814.
Description:
Observations of NGC6814 were conducted with the Hubble Space Telescope
(HST) Wide Field Camera 3 (WFC3) between 2013 August 8 and October 9.
The UVIS detectors provide images with a field of view of 2.6'x2.6'
and pixel scale of 0.04".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 90 Best-fit properties of cepheid candidates
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See also:
J/ApJ/652/1133 : BVI photometry of NGC 4258 Cepheids (Macri+, 2006)
J/ApJ/730/119 : HST/WFC3 observations of Cepheids in SN Ia hosts (Riess+,2011)
J/ApJ/733/124 : Cepheids in M101 observed with HST (Shappee+, 2011)
J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013)
J/ApJ/799/144 : M31 Cepheids in near-IR (Kodric+, 2015)
J/AcA/65/297 : OGLE4 LMC and SMC Cepheids (Soszynski+, 2015)
J/ApJ/830/10 : >20yrs of HST obs. Cepheids in SNIa host gal. (Hoffmann+,2016)
J/ApJ/866/133 : Continuum-Hβ light curves of 5 Seyfert 1 (De Rosa+, 2018)
J/ApJ/876/85 : HST observations for LMC Cepheids (Riess+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/90] Sequential number
4- 5 I2 h RAh [19] Hour of right ascension (J2000)
7- 8 I2 min RAm [42] Minute of right ascension (J2000)
10- 15 F6.3 s RAs [34/47] Second of right ascension (J2000)
17 A1 --- DE- [-] Sign of declination (J2000)
19- 20 I2 deg DEd [10] Degree of declination (J2000)
22- 23 I2 arcmin DEm [17/21] Arcminute of declination (J2000)
25- 30 F6.3 arcsec DEs Arcsecond of declination (J2000)
32- 36 F5.2 mag F555W [25.6/28.2] F555W magnitude
38- 41 F4.2 mag e_F555W [0.02/0.2] Error on F555W
43- 47 F5.2 mag F814W [24.5/26.9] F814W magnitude
49- 52 F4.2 mag e_F814W [0.03/0.2] Error on F814W
54- 58 F5.2 d Per [13.1/83.6] Period
60- 63 F4.2 d e_Per [0.2/9.6] Error on Per
65- 69 F5.2 d Phase [0.54/55.2] Phase of light curve relative to the
date of first visit
71- 74 F4.2 d e_Phase [0.2/5.6] Error on Phase
76- 79 F4.2 --- chi/nu [0.44/3.98] χ2/ν value
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 17-Sep-2021