2013ApJ...777....8V

Query : 2013ApJ...777....8V

2013ApJ...777....8V - Astrophys. J., 777, 8 (2013/November-1)

The signatures of particle decay in 21 cm absorption from the first minihalos.

VASILIEV E.O. and SHCHEKINOV Yu.A.

Abstract (from CDS):

The imprint of decaying dark matter (DM) particles on the characteristics of the "21 cm forest"–absorption at 21 cm from minihalos in the spectra of distant radio-loud sources–is considered within a one-dimensional, self-consistent hydrodynamic description of minihalos from their turnaround point to virialization. The most pronounced influence of decaying DM on the evolution of minihalos is found in the mass range M = 105-106 M☉, for which unstable DM with a current upper limit on its ionization rate of ξL= 0.59 x10–25/s reduces the 21 cm optical depth by an order of magnitude compared with the standard recombination scenario. Even a rather modest ionization, ξ ∼ 0.3ξL, practically erases absorption features and results in a considerable decrease (by factor of more than 2.5) of the number of strong (Wνobs ≳ 10 kHz at z ≃ 10) absorptions. In such circumstances, broadband observations are more suitable for inferring the physical conditions of the absorbing gas. X-ray photons from stellar activity of the initial episodes of star formation can compete with the contribution from decaying DM only at z < 10. Therefore, observing the 21 cm signal will allow us to follow the evolution of decaying DM particles in the redshift range z = 10-15. On the other hand, a non-detection of the 21 cm signal in the frequency range ν < 140 MHz can establish a lower limit on the ionization rate from decaying DM.

Abstract Copyright: ∼

Journal keyword(s): cosmology: theory - dark matter - diffuse radiation - early universe - line: formation - radio lines: general

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2384 2

Query : 2013ApJ...777....8V

Basic data :
NAME Cyg A -- Seyfert 2 Galaxy
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		Sy1 (), Rad (2020A&A,BWE,...), X (3A,2E,...), AGN ([HB91],[VV2000c],...), G (2012A&A,LEDA,...), Sy2 (2007ApJS), QSO (2013ApJS,QSO), Bla ([IN88]), GiC ([OLM97]), GiG ([SS82]), IG (VV), * (KIC), gam (INTREF), NIR (2MASS), IR (IRAS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		19 59 28.35656837 +40 44 02.0972325 (Radio) [ 0.458059 0.4185 0 ] A 2020A&A...644A.159C
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		19 57 44.45368708 +40 35 46.3193819 [ 0.458059 0.4185 0 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		076.18988064623 +05.75538801499 [ 0.458059 0.4185 0 ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 16474 [150] / z(emission) 0.05654853 [0.0005] / cz 16952.8228 [150]
   (Opt) C 2022ApJS..261....2K
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the morphological type reference
Morphological type: 		E D ~
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		0.603 0.507 160 (NIR) C 2006AJ....131.1163S
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (5) :
B 16.22 [~] E ~
V 15.10 [~] D 2011MNRAS.414..500H
J 11.437 [0.058] C 2006AJ....131.1163S
H 10.611 [0.051] C 2006AJ....131.1163S
K 10.276 [0.062] C 2006AJ....131.1163S
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Some important notes on this object about identifications and objects associations.
notes:

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (60) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME Cyg A 1H 1958+406 NVSS J195924+404419 WMAP J1959+4044
3A 1958+407 ICRF J195928.3+404402 NVSS J195932+404347 W 57
BWE 1957+4035 IERS B1957+406 PBC J1959.4+4044 2XMM J195924.0+404418
1C 19.01 INTREF 1004 QSO B1957+405 [DGW65] 129
3C 405 IRAS 19577+4035 1RXS J195928.7+404405 [HB91] 1957+405
3C 405.0 KIC 5568067 SWIFT J1959.4+4044 [HR74] Ce
4C 40.40 LEDA 63932 TIC 172770364 [IN88] 1957+405
3CR 405 1M 1957+406 2U 1957+40 [KRL2007b] 371
CTA 88 2MASS J19592834+4044020 3U 1957+40 [OLM97] J195928.3+404402
CTB 81 2MASX J19592833+4044022 4U 1957+40 [SS82] 1
DA 500 MCG+07-41-003 VLSSr J195920.3+404419 [VV2000c] J195928.3+404402
DB 117 Mills 19+4 VLSS J1959.4+4044 [VV2003c] J195928.3+404402
2E 4309 MY 195745.2+404427.5 VSOP J1959+4044 [VV2006c] J195928.3+404402
2E 1957.7+4035 NAME Cygnus A VSOP J1959+4043 [VV2010c] J195928.3+404402
1ES 1957+40.5 NRAO 620 VV 72 [VV98c] J195928.3+404402

References (2384 between 1850 and 2024) (Total 2384)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 11   

   

Observing logs


herschel : 14    ISO : 20   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NAME Cyg A

Link by name to the catalogue in VizieR :

BWE 1957+4035 3C 405 3C 405.0 4C 40.40 3CR 405
2E 4309 IERS B1957+406 IRAS 19577+4035 KIC 5568067 2MASS J19592834+4044020
2MASX J19592833+4044022 NVSS J195924+404419 NVSS J195932+404347 1RXS J195928.7+404405 VSOP J1959+4044
VSOP J1959+4043 WMAP J1959+4044

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