2025ApJ...984L..36W

Query : 2025ApJ...984L..36W

2025ApJ...984L..36W - Astrophys. J., 984, L36 (2025/May-1)

Discovery of the Seven-ring Polycyclic Aromatic Hydrocarbon Cyanocoronene (C₂₄H₁₁CN) in GOTHAM Observations of TMC-1.

WENZEL G., GONG S., XUE C., CHANGALA P.B., HOLDREN M.S., SPEAK T.H., STEWART D.A., FRIED Z.T.P., WILLIS R.H.J., BERGIN E.A., BURKHARDT A.M., BYRNE A.N., CHARNLEY S.B., LIPNICKY A., LOOMIS R.A., SHINGLEDECKER C.N., COOKE I.R., McCARTHY M.C., REMIJAN A.J., WENDLANDT A.E. and McGUIRE B.A.

Abstract (from CDS):

We present the synthesis and laboratory rotational spectroscopy of the seven-ring polycyclic aromatic hydrocarbon (PAH) cyanocoronene (C₂₄H₁₁CN) using a laser-ablation-assisted cavity-enhanced Fourier transform microwave spectrometer. A total of 71 transitions were measured and assigned between 6.8 and 10.6 GHz. Using these assignments, we searched for emission from cyanocoronene in the Green Bank Telescope (GBT) Observations of TMC-1: Hunting Aromatic Molecules project observations of the cold dark molecular cloud TMC-1 using the 100 m GBT. We detect a number of individually resolved transitions in ultrasensitive X-band observations and perform a Markov Chain Monte Carlo analysis to derive best-fit parameters, including a total column density of $N({{\rm{C}}}_{24}{{\rm{H}}}_{11}{\rm{CN}})=2.6{9}_{-0.23}^{+0.26}\times 1{0}^{12}\,{{\rm{cm}}}^{-2}$ at a temperature of $6.0{5}_{-0.37}^{+0.38}\,$ K. A spectral stacking and matched filtering analysis provides a robust 17.3σ significance to the overall detection. The derived column density is comparable to that of cyano-substituted naphthalene, acenaphthylene, and pyrene, defying the trend of decreasing abundance with increasing molecular size and complexity found for carbon chains. We discuss the implications of the detection for our understanding of interstellar PAH chemistry and highlight major open questions and next steps.

Journal keyword(s): Astrochemistry - Polycyclic aromatic hydrocarbons - Interstellar medium - Interstellar molecules - Radio astronomy - Radio spectroscopy - High resolution spectroscopy - Microwave spectroscopy - Rotational spectroscopy - Cavity-enhanced Fourier-transform - Surveys

Simbad objects: 1

Full paper

View the references in ADS

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 - 2026	#notes
1	TMC-1	MoC	04 41 45.9	+25 41 27						~	1872	0

Query : 2025ApJ...984L..36W

Basic data :

TMC-1 -- Molecular Cloud
Other object types:	`PoC (MLB,[MOH94])`, `MoC (TMC)`, `Cld (HCL)`
ICRS coord. (ep=J2000) :	`04 41 45.9 +25 41 27 [ ] D 1983ApJ...264..517M`
FK4 coord. (ep=B1950 eq=1950) :	`04 38 42.0 +25 35 45 [ ]`
Gal coord. (ep=J2000) :	`174.3852 -13.4312 [ ]`

Overlay

points in this preview

2MASS DSS

All

(CDSPortal)

Send to

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

An access of full data is available using the icon Vizier near the identifier of the catalogue

HCL 2 MLB 3-28 TMC-1 [MOH94] 6

References (1872 between 1850 and 2026) (Total 1872)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

Follow new references on this object

Observing logs

External archives :

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 2025ApJ...984L..36W and select 'bookmark this link' or equivalent in the popup menu