J/ApJ/632/799 NGC4395 light curves (Peterson+, 2005)
Multiwavelength monitoring of the dwarf Seyfert 1 galaxy NGC 4395.
I. A reverberation-based measurement of the black hole mass.
Peterson B.M., Bentz M.C., Desroches L.-B., Filippenko A.V., Ho L.C.,
Kaspi S., Laor A., Maoz D., Moran E.C., Pogge R.W., Quillen A.C.
<Astrophys. J., 632, 799-808 (2005)>
=2005ApJ...632..799P 2005ApJ...632..799P
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; Ultraviolet
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert -
quasars: emission lines - ultraviolet: galaxies
Abstract:
A reverberation-mapping program on NGC 4395, the least luminous known
Seyfert 1 galaxy, undertaken with the Space Telescope Imaging
Spectrograph on the Hubble Space Telescope yields a measurement of the
mass of the central black hole MBH=(3.6±1.1)x105M☉. The
observations consist of two visits of five orbits each, in 2004 April
and July. During each of these visits, the UV continuum varied by at
least 10% (rms), and only C IV λ1549 showed corresponding
variations large enough to reliably determine the emission-line lag,
which was measured to be of order 1-hr for both visits.
Description:
We observed NGC 4395 with the HST Space Telescope Imaging Spectrograph
(STIS) using the FUV MAMA detector with the G140L grating, which
covers the spectral range 1150-1700Å. The first session, visit 1,
began on 2004 April 10 03:19. The second session, visit 2, began the
next day, on 2004 April 11 03:43. NGC 4395 was reobserved during a
later session, visit 3, beginning on 2004 July 3 12:07. All
observations were made through a 52"x0.5" slit at position angles
116.5°, 119.7°, and 60.9° for visits 13, respectively.
Objects:
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RA (2000) DE Designation(s)
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12 25 48.9 +33 32 48 NGC 4395 = UGC 7524
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 65 Light curves for visit 2
table2.dat 37 65 Light curves for visit 3
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See also:
J/ApJS/98/477 : Optical spectral atlas of Seyfert nuclei (Ho+ 1995)
J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)
J/ApJS/133/77 : VLA radio continuum survey of Seyfert galaxies (Ho+, 2001)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Julian Date of observation
15- 19 F5.3 10-16W/m2/nm F1350 1350Å flux (1)
21- 25 F5.3 10-16W/m2/nm e_F1350 Uncertainty in F1350 (1)
27- 31 F5.3 fW/m2 FCIV C IV (1549Å) integrated line flux (2)
33- 37 F5.3 fW/m2 e_FCIV Uncertainty in FCIV (2)
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Note (1): In units of 10-14erg/s/cm2/Angstroms.
Note (2): In units of 10-12erg/s/cm2.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 22-May-2006