The stellar edge of NGC 1494 with LSST Data Preview 1

LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494
wi h LSST Da a P e iew 1
Giulia Golini
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
NGC 1494, DECaLS DR10, FoV: 6' x 8'
Gas densi y h eshold o
3–10 M⊙/pc2
(Schaye 2004)
ΛCDM inside ou g ow h o galaxies (Peebles 1969);
Gas con e ed in o s a s (in si u s a o ma ion)
S ella mass densi y d op
a 1–3 M⊙/pc2
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
µV > 27 mag/a csec2
ΛCDM inside ou g ow h o galaxies (Peebles 1969);
Gas con e ed in o s a s (in si u s a o ma ion)
NGC 4565; Ma inez-Lombilla+2019
Gas densi y h eshold o
3–10 M⊙/pc2
(Schaye 2004)
S ella mass densi y d op
a 1–3 M⊙/pc2
µ[mag a csec-2]
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
R1(T ujillo+2020); Redge (Chamba+2022);
adial loca ion o he s ella mass densi y d op
S ipe82 da a; Chamba+2022
Redge ∝ M★1/3
a z = 0
Redge e olu ion
(5000 km/h) and
𝛴★edge dec ease
since z = 1
Bui ago & T ujillo 2023
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
Bui ago & T ujillo 2023
R1(T ujillo+2020); Redge (Chamba+2022);
adial loca ion o he s ella mass densi y d op
! WARNING !
Redge was isually
iden i ied
S ipe82 da a; Chamba+2022

LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Euclid (1.2m)
LSST (6.4m)
The s ella edge o NGC 1494 wi h LSST DP1
! WARNING !
Redge was isually
iden i ied
In he e a o big da a we mus a oid isual iden i ica ion
o he edge
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
Golini+2025
Redge: As he minimum o he second de i a i e o 𝛴★
app oxima ed by a B okenExponen ial unc ion
NGC 3486
LBT, 8.2m, µ(lim)~31
mag/a csec2 V-band
(3σ; 10" x 10")
In he e a o big da a we mus a oid isual iden i ica ion
o he edge
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
NGC 3486
Golini+2025
In he e a o big da a we mus a oid isual iden i ica ion
o he edge
Schaye 2004 ✅
Redge: As he minimum o he second de i a i e o 𝛴★
app oxima ed by a B okenExponen ial unc ion
LBT, 8.2m, µ(lim)~31
mag/a csec2 V-band
(3σ; 10" x 10")
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
In he e a o big da a we mus a oid isual iden i ica ion
o he edge
Wha abou using
LSST?
LSST (6.4m), µ(g, lim)~30.3 mag/a csec2
(3σ; 10"x10") in 10 yea s
Redge: As he minimum o he second de i a i e o 𝛴★
app oxima ed by a B okenExponen ial unc ion
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
Fu u e wo k:
- Imp o ed gain co ec ion
The s ella edge o NGC 1494 wi h LSST DP1
LSST DP1, 16 channels
GMOS came a a Gemini elescopes; Golini+2024
µ(g,lim (3σ; 10"x10")) ~30.9 mag/a csec2
2DO 0RGO 5GDO
1

LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
Fu u e wo k:
- Imp o e gain co ec ion
- Tes unning la - ield co ec ion
- Weigh ed coadd
- Add isi s o inc ease dep h
- PSF emo al
- mul i-wa eleng h analysis
LSST (6.4m), expec ed
µ(g,lim)~30.3 mag/a csec2
(3σ; 10"x10") in 10 yea s
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494 wi h LSST DP1
To wa p up:
- Galaxy edges a e key o es ing ΛCDM inside-ou g ow h
→ equi e deep imaging
- LSST will deli e he dep h and
co e age needed o mul i-wa eleng h
and s a is ical s udies
- Op imized da a educ ion is essen ial
o each ull po en ial LSST (6.4m), expec ed
µ(g,lim)~30.3 mag/a csec2
(3σ; 10"x10") in 10 yea s
LSST@Eu ope7 | Poznań, Poland | Sep embe 15 h-19 h, 2025 Glossa y & Ac onyms
The s ella edge o NGC 1494
wi h LSST Da a P e iew 1
Giulia Golini