J/ApJS/227/1 HST survey for novae in M87. I. VI LCs (Shara+, 2016)
A Hubble Space Telescope survey for novae in M87.
I. Light and color curves, spatial distributions, and the nova rate.
Shara M.M., Doyle T.F., Lauer T.R., Zurek D., Neill J.D., Madrid J.P.,
Mikolajewska J., Welch D.L., Baltz E.A.
<Astrophys. J. Suppl. Ser., 227, 1-1 (2016)>
=2016ApJS..227....1S 2016ApJS..227....1S (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, HST ; Novae ; Surveys ; Galaxies, nearby
Keywords: binaries: close; novae, cataclysmic variables
Abstract:
The Hubble Space Telescope has imaged the central part of M87 over a
10 week span, leading to the discovery of 32 classical novae (CNe) and
nine fainter, likely very slow, and/or symbiotic novae. In this first
paper of a series, we present the M87 nova finder charts, and the
light and color curves of the novae. We demonstrate that the rise and
decline times, and the colors of M87 novae are uncorrelated with each
other and with position in the galaxy. The spatial distribution of the
M87 novae follows the light of the galaxy, suggesting that novae
accreted by M87 during cannibalistic episodes are well-mixed.
Conservatively using only the 32 brightest CNe we derive a nova rate
for M87: 363-45+33 novae yr-1. We also derive the
luminosity-specific classical nova rate for this galaxy, which is
7.88-2.6+2.3yr-1/1010L☉,K. Both rates are 3-4 times
higher than those reported for M87 in the past, and similarly higher
than those reported for all other galaxies. We suggest that most
previous ground-based surveys for novae in external galaxies,
including M87, miss most faint, fast novae, and almost all slow novae
near the centers of galaxies.
Description:
The data used to find novae, during the 72 day long observing
campaign, were images taken for the HST Cycle-14 program 10543
(PI--E. A. Baltz). Four observations, separated by five days, were
followed by daily imaging for the remainder of the program, with the
HST ACS in the F606W (V band) and F814W (I band) filters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 99 1984 Magnitudes and colors of the 32 brightest M87 novae
table3.dat 69 41 Positions, and rise and decline times of M87 novae
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004)
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 [1/32] M87 nova identifier
4- 12 A9 --- HSTFileV HST file number in F606W (V band)
14- 19 F6.2 d dMaxV [-72.4/72.4] Days from maximum light of
the observation
21- 31 A11 "Y/M/D" DateV Date of observation in V-band
33- 38 F6.3 mag Vmag [21.8/28.5]? HST/ACS V band (F606W) magnitude
40- 44 F5.3 mag e_Vmag [0.01/3.4]? Vmag uncertainty
46- 54 A9 --- HSTFileI HST file number in F814W (I band)
56- 61 F6.2 d dMaxI [-72.4/72.4]? Days from maximum light of
the observation
63- 73 A11 "Y/M/D" DateI Date of observation in I-band
75- 80 F6.3 mag Imag [21.5/33.9]? HST/ACS I band (F814W) magnitude
82- 86 F5.3 mag e_Imag [0.01/8.7]? Imag uncertainty
88- 93 F6.3 mag V-I [-6.2/2.5]? V-I color index
95- 99 F5.3 mag e_V-I [0.01/8.7]? V-I uncertainty
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/41] Nova identifier
4- 9 F6.2 arcsec Dist [4.9/133.1] Radial distance
from the center of M87
11- 12 I2 h RAh Hour of right ascension (J2000)
14- 15 I2 min RAm Minute of right ascension (J2000)
17- 21 F5.2 s RAs Second of right ascension (J2000)
23 A1 --- DE- Sign of declination (J2000)
24- 25 I2 deg DEd Degree of declination (J2000)
27- 28 I2 arcmin DEm Arcminute of declination (J2000)
30- 34 F5.2 arcsec DEs Arcsecond of declination (J2000)
36- 40 F5.2 mag Imag [21.5/25.9] I magnitude at maximum brightness
42- 46 F5.2 mag Vmag [21.8/26.3] V magnitude at maximum brightness
48- 51 F4.2 d t1rise [0.6/5.2]? Time to rise to
maximum brightness by 1mag
53- 57 F5.2 d t2rise [1.3/12.2]? Time to rise to
maximum brightness by 2mag
59- 63 F5.2 d t1dec [0.9/15.9]? Time to fall from
maximum brightness by 1mag
65- 69 F5.2 d t2dec [2/36.3]? Time to fall from
maximum brightness by 2mag
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 19-Apr-2017